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Difficulty: 3 of 5Under Evaluate area (in Just Math)
Posted on 2024-03-28 (2 Comments)
Monte Carlo method by Charlie (2024-03-28 19:53:08)
Solution solution by Charlie (2024-03-28 13:34:40)
Difficulty: 2 of 5Under Sum of distinct digit number (in Just Math)
Posted on 2024-03-28 (4 Comments)
Solution solution by Charlie (2024-03-28 09:25:17)
Difficulty: 3 of 5Under Cables II (in Tricks)
Posted on 2024-03-27 (2 Comments)
Solution solution by Charlie (2024-03-27 14:20:36)
Difficulty: 3 of 5Under Maximizing products (in Just Math)
Posted on 2024-03-26 (5 Comments)
solution by Charlie (2024-03-26 14:04:32)
Difficulty: 3 of 5Under Best-Of-Five (in General)
Posted on 2024-03-25 (1 Comments)
Solution computer-aided solution by Charlie (2024-03-25 10:27:04)
Difficulty: 3 of 5Under 3 3s times 3 3s has 9 9s (in Numbers)
Posted on 2024-03-24 (3 Comments)
Solution solution by Charlie (2024-03-24 10:10:05)
Difficulty: 3 of 5Under Cables (in General)
Posted on 2024-03-22 (3 Comments)
Solution No Subject by Charlie (2024-03-22 14:15:10)
Difficulty: 3 of 5Under Cube Arranger (in Numbers)
Posted on 2024-03-22 (3 Comments)
Solution computer solution by Charlie (2024-03-22 10:00:23)
Difficulty: 3 of 5Under Counting Partitions (in Just Math)
Posted on 2024-03-21 (3 Comments)
Solution re: solution by Charlie (2024-03-21 16:25:09)
Some Thoughts solution by Charlie (2024-03-21 13:45:01)
Difficulty: 3 of 5Under Odd divisor summation (in Just Math)
Posted on 2024-03-21 (4 Comments)
Solution computer solution by Charlie (2024-03-21 10:10:50)
Difficulty: 3 of 5Under Chests (in Logic)
Posted on 2024-03-20 (4 Comments)
Some Thoughts re: simulation by Charlie (2024-03-20 13:44:45)
Some Thoughts simulation by Charlie (2024-03-20 13:24:49)
Some Thoughts re: a start for a way to go by Charlie (2024-03-20 08:19:51)
Some Thoughts a start for a way to go by Charlie (2024-03-20 07:35:38)
Difficulty: 3 of 5Under Plug (in General)
Posted on 2024-03-19 (3 Comments)
solution by Charlie (2024-03-19 13:18:17)
Difficulty: 3 of 5Under Taking the Long Shot (in Probability)
Posted on 2024-03-18 (1 Comments)
Solution solution by Charlie (2024-03-18 12:05:01)
Difficulty: 3 of 5Under Election (in General)
Posted on 2024-03-17 (3 Comments)
Some Thoughts thoughts by Charlie (2024-03-17 09:03:14)
Difficulty: 3 of 5Under Averaging factorials (in Just Math)
Posted on 2024-03-16 (2 Comments)
Some Thoughts thoughts and calculations by Charlie (2024-03-16 13:20:43)
Difficulty: 3 of 5Under Hitter's Duel (in General)
Posted on 2024-03-16 (1 Comments)
Solution solution by Charlie (2024-03-16 09:15:54)
Difficulty: 4 of 5Under Power Digits (in Numbers)
Posted on 2024-03-15 (6 Comments)
different algorithm to find the numbers by Charlie (2024-03-16 08:13:30)
re: Some numbers but without a proof by Charlie (2024-03-15 18:16:24)
Difficulty: 3 of 5Under Three Concatenations (in Numbers)
Posted on 2024-03-15 (4 Comments)
Solution computer solution by Charlie (2024-03-15 10:48:05)
Difficulty: 3 of 5Under Non-conformist choice (in Probability)
Posted on 2024-03-14 (4 Comments)
Solution solution by Charlie (2024-03-14 09:05:26)
Difficulty: 3 of 5Under The Second Visit (in General)
Posted on 2024-03-13 (2 Comments)
Solution computer solution (spoiler) by Charlie (2024-03-13 11:32:37)
Difficulty: 3 of 5Under Semi-1 number (in Just Math)
Posted on 2024-03-13 (3 Comments)
Solution computer exploration plus analytic limit by Charlie (2024-03-13 08:34:52)
Difficulty: 3 of 5Under Square Digits (in Numbers)
Posted on 2024-03-12 (7 Comments)
Solution solution by Charlie (2024-03-12 12:18:46)
Difficulty: 3 of 5Under Find This Limit (in Calculus)
Posted on 2024-03-10 (4 Comments)
Solution computer solution by Charlie (2024-03-10 09:02:12)
Difficulty: 3 of 5Under Deciphering the Duel (in Just Math)
Posted on 2024-03-09 (3 Comments)
Solution computer solution by Charlie (2024-03-09 12:29:50)
Difficulty: 3 of 5Under Rich Uncle (in Numbers)
Posted on 2024-03-08 (1 Comments)
Some Thoughts possible solution by Charlie (2024-03-08 13:26:28)
Difficulty: 3 of 5Under Three Accountants Crossed Four Numbers Puzzle (in Numbers)
Posted on 2024-03-08 (1 Comments)
Solution computer-aided solution by Charlie (2024-03-08 11:07:50)
Difficulty: 3 of 5Under Constrained triangle (in Just Math)
Posted on 2024-03-07 (3 Comments)
Solution solution by Charlie (2024-03-07 09:37:02)
Difficulty: 3 of 5Under Differences (in Numbers)
Posted on 2024-03-06 (3 Comments)
Some Thoughts possible solution by Charlie (2024-03-06 09:15:31)
Difficulty: 3 of 5Under Altering Pickup Routine (in Just Math)
Posted on 2024-03-05 (2 Comments)
Solution solution by Charlie (2024-03-05 11:54:50)
Difficulty: 3 of 5Under Define a rational function (in Probability)
Posted on 2024-03-04 (5 Comments)
Solution solution by Charlie (2024-03-04 13:28:43)
Difficulty: 3 of 5Under Row of towers, Part 2 (in Probability)
Posted on 2024-03-01 (2 Comments)
Solution solution by Charlie (2024-03-01 13:19:50)
Difficulty: 3 of 5Under tetrahedron contained in a sphere (in Shapes)
Posted on 2024-02-29 (4 Comments)
Solution solution by Charlie (2024-02-29 14:25:31)
Difficulty: 3 of 5Under Non Prime Integer Inquiry (in Just Math)
Posted on 2024-02-29 (3 Comments)
Solution computer solution by Charlie (2024-02-29 08:13:23)
Difficulty: 4 of 5Under Pythagorean Triples #3 (in Numbers)
Posted on 2024-02-28 (2 Comments)
Some Thoughts computer exploration by Charlie (2024-02-28 13:58:55)
Difficulty: 3 of 5Under Mostly 52 (in Probability)
Posted on 2024-02-27 (5 Comments)
re(2): solution by Charlie (2024-03-01 07:46:08)
Solution solution by Charlie (2024-02-28 08:17:17)
Difficulty: 4 of 5Under Second derivative of a cosine product (in Calculus)
Posted on 2024-02-27 (5 Comments)
Solution computer solution (spoiler) by Charlie (2024-02-27 12:18:43)
Difficulty: 2 of 5Under Atbash Self Referential Number (in Numbers)
Posted on 2024-02-27 (4 Comments)
Solution computer solution by Charlie (2024-02-27 08:33:36)
Difficulty: 3 of 5Under Who wins? 2 (in Probability)
Posted on 2024-02-26 (3 Comments)
re: Solution by Charlie (2024-02-26 12:21:41)
Difficulty: 3 of 5Under Some Sum of 2 Powers is a Perfect Square (in Numbers)
Posted on 2024-02-26 (2 Comments)
Solution computer solution by Charlie (2024-02-26 10:11:54)
Difficulty: 3 of 5Under Row of towers (in Shapes)
Posted on 2024-02-23 (5 Comments)
re: Formula by Charlie (2024-02-24 07:51:09)
Solution computer-aided solution by Charlie (2024-02-23 13:01:43)
Difficulty: 3 of 5Under Find all possible values of x (in Just Math)
Posted on 2024-02-23 (2 Comments)
Solution solution by Charlie (2024-02-23 08:27:16)
Difficulty: 2 of 5Under Multiples of 6 (in Probability)
Posted on 2024-02-22 (9 Comments)
re(3): Benford's Law by Charlie (2024-02-22 21:54:26)
Difficulty: 3 of 5Under An unlikely solution! (in Just Math)
Posted on 2024-02-21 (4 Comments)
No Subject by Charlie (2024-02-21 23:06:05)
Difficulty: 2 of 5Under Ellipse covered by 2 circles (in Calculus)
Posted on 2024-02-21 (3 Comments)
Solution solution by Charlie (2024-02-21 08:10:04)
Difficulty: 3 of 5Under Distinct Powers (in Numbers)
Posted on 2024-02-20 (3 Comments)
Solution computer solution by Charlie (2024-02-20 11:55:58)
Difficulty: 3 of 5Under Find Last 3 Digits (in Just Math)
Posted on 2024-02-20 (4 Comments)
re(2): computer-aided solution by Charlie (2024-02-20 11:03:22)
Solution computer-aided solution by Charlie (2024-02-20 09:12:15)
Difficulty: 3 of 5Under Helping without trig (in Just Math)
Posted on 2024-02-19 (5 Comments)
re(2): solution by Charlie (2024-02-19 18:17:47)
Solution solution by Charlie (2024-02-19 13:44:47)
Difficulty: 3 of 5Under Polygon Perimeter (in Just Math)
Posted on 2024-02-19 (4 Comments)
Solution finding the perimeter by Charlie (2024-02-19 09:04:33)
Difficulty: 3 of 5Under 3 Cubes #2 (in Numbers)
Posted on 2024-02-18 (4 Comments)
Solution computer solution by Charlie (2024-02-18 13:39:36)
Difficulty: 3 of 5Under Define the members of S (in Just Math)
Posted on 2024-02-18 (3 Comments)
re: flawed program, but some ideas by Charlie (2024-02-18 10:32:33)
Some Thoughts flawed program, but some ideas by Charlie (2024-02-18 10:22:37)
Difficulty: 3 of 5Under Prime Pairs satisfy Quintic = Cubic (in Numbers)
Posted on 2024-02-17 (7 Comments)
Some Thoughts probable solution by Charlie (2024-02-17 15:52:16)
Difficulty: 4 of 5Under Prime Digit Replacements (in Numbers)
Posted on 2024-02-16 (4 Comments)
Just a comment! by Charlie (2024-02-16 11:51:25)
Difficulty: 3 of 5Under Multiplication Includes All Digits (in Numbers)
Posted on 2024-02-16 (4 Comments)
Solution computer solution by Charlie (2024-02-16 10:07:34)
Difficulty: 1 of 5Under Remainder Reckoning (in Numbers)
Posted on 2024-02-15 (3 Comments)
Solution computer solution by Charlie (2024-02-15 10:39:10)
Difficulty: 3 of 5Under cosine equated to polynomial (in Just Math)
Posted on 2024-02-13 (3 Comments)
Solution solution by Charlie (2024-02-13 07:50:11)
Difficulty: 3 of 5Under Equal cubic roots (in Just Math)
Posted on 2024-02-12 (3 Comments)
Solution solution by Charlie (2024-02-12 12:57:56)
Difficulty: 2 of 5Under Not equal but fair (in Just Math)
Posted on 2024-02-12 (5 Comments)
re(2): computer solution by Charlie (2024-02-13 08:08:11)
Solution computer solution by Charlie (2024-02-12 09:30:31)
Difficulty: 3 of 5Under 1,000,000 doors (in Numbers)
Posted on 2024-02-11 (1 Comments)
Solution solution by Charlie (2024-02-11 08:40:31)
Difficulty: 3 of 5Under Quadratic Primes (in Numbers)
Posted on 2024-02-07 (2 Comments)
Solution computer solution by Charlie (2024-02-07 14:34:58)
Difficulty: 3 of 5Under Some special states (in Word Problems)
Posted on 2024-02-06 (6 Comments)
Solution computer solution by Charlie (2024-02-06 19:09:16)
Difficulty: 3 of 5Under Hyperbolic center (in Just Math)
Posted on 2024-02-06 (3 Comments)
Solution solution by Charlie (2024-02-06 12:33:07)
Difficulty: 2 of 5Under A perfect appearance (in Probability)
Posted on 2024-02-06 (2 Comments)
Solution solution by Charlie (2024-02-06 08:29:36)
Difficulty: 3 of 5Under Quadratic Function Determination (in Just Math)
Posted on 2024-02-02 (4 Comments)
Solution Using Wolfram Alpha by Charlie (2024-02-02 11:07:30)
Difficulty: 3 of 5Under Neponacci. (in Numbers)
Posted on 2024-02-01 (3 Comments)
re: Possible issue by Charlie (2024-02-02 11:31:53)
Solution computer solution by Charlie (2024-02-01 13:30:52)
Difficulty: 3 of 5Under The Right Key (in Logic)
Posted on 2024-02-01 (6 Comments)
off topic by Charlie (2024-02-01 10:46:29)
Solution computer solution by Charlie (2024-02-01 08:59:37)
Difficulty: 3 of 5Under Pythagorean Triples #1 (in Numbers)
Posted on 2024-01-31 (2 Comments)
Solution computer solution by Charlie (2024-01-31 13:57:22)
Difficulty: 3 of 5Under Difference of Two Expressions equal n (in Just Math)
Posted on 2024-01-30 (1 Comments)
Solution answer by Charlie (2024-01-30 13:37:21)
Difficulty: 2 of 5Under The First Lady (in Probability)
Posted on 2024-01-30 (12 Comments)
re: Perfect Shuffle by Charlie (2024-01-30 10:01:11)
Solution re: computer solution by Charlie (2024-01-30 09:41:33)
Some Thoughts computer solution by Charlie (2024-01-30 09:23:01)
Difficulty: 2 of 5Under Red and Blue chips (in Just Math)
Posted on 2024-01-28 (3 Comments)
Solution solution by Charlie (2024-01-28 11:22:18)
Difficulty: 2 of 5Under Picking boxes (in Just Math)
Posted on 2024-01-28 (5 Comments)
Solution computer solution by Charlie (2024-01-28 10:33:05)
Difficulty: 3 of 5Under Region Area Ascertainment 2 (in Shapes)
Posted on 2024-01-27 (4 Comments)
Solution solution by Charlie (2024-01-27 09:56:53)
Difficulty: 3 of 5Under Find the possible values of a*b. (in Just Math)
Posted on 2024-01-26 (2 Comments)
Solution possible solution by Charlie (2024-01-26 11:43:54)
Difficulty: 3 of 5Under Permutation (in Numbers)
Posted on 2024-01-24 (5 Comments)
re(2): solution by Charlie (2024-01-24 16:43:07)
Solution solution by Charlie (2024-01-24 09:07:22)
Difficulty: 3 of 5Under Foreheads (in Numbers)
Posted on 2024-01-22 (3 Comments)
Solution computer-aided solution by Charlie (2024-01-22 09:10:25)
Difficulty: 3 of 5Under Cube + Single Digit = Perfect Square (in Numbers)
Posted on 2024-01-21 (2 Comments)
Solution computer solution by Charlie (2024-01-21 12:39:47)
Difficulty: 3 of 5Under Rose-Innes are Squares (in Numbers)
Posted on 2024-01-21 (2 Comments)
Solution computer solution by Charlie (2024-01-21 10:21:13)
Difficulty: 3 of 5Under Power Heronian (in Numbers)
Posted on 2024-01-19 (1 Comments)
Solution computer solution by Charlie (2024-01-19 10:36:20)
Difficulty: 3 of 5Under Tripartite words (in Logic)
Posted on 2024-01-16 (5 Comments)
re(2): longer list continued by Charlie (2024-01-17 08:32:54)
re: longer list continued by Charlie (2024-01-17 08:31:52)
longer list by Charlie (2024-01-17 08:30:15)
the short list by Charlie (2024-01-17 08:26:36)
Difficulty: 3 of 5Under Two arithmetic sequences (in Numbers)
Posted on 2024-01-16 (4 Comments)
a different interpretation by Charlie (2024-01-16 15:09:50)
Difficulty: 3 of 5Under Double number digit sum (in Numbers)
Posted on 2024-01-16 (3 Comments)
Solution computer solution by Charlie (2024-01-16 08:41:18)
Difficulty: 3 of 5Under Triangle's features (in Geometry)
Posted on 2024-01-15 (5 Comments)
Some Thoughts Partial answer by Charlie (2024-01-15 18:24:12)
Difficulty: 3 of 5Under Each of the 9 Words is a Perfect Square (in Numbers)
Posted on 2024-01-15 (2 Comments)
Solution computer solution by Charlie (2024-01-15 08:37:02)
Difficulty: 3 of 5Under That’s ENTERTAINMENT (in Word Problems)
Posted on 2024-01-14 (5 Comments)
Solution computer solution by Charlie (2024-01-14 08:32:37)
Difficulty: 3 of 5Under Alphabetic Order (in General)
Posted on 2024-01-13 (3 Comments)
Some Thoughts an attempt by Charlie (2024-01-13 07:44:05)
Difficulty: 3 of 5Under LCM and GCD Crossed Value Derivation (in Just Math)
Posted on 2024-01-11 (3 Comments)
Some Thoughts computer findings by Charlie (2024-01-11 08:57:47)
Difficulty: 3 of 5Under Mr. S and Mr. P (in Numbers)
Posted on 2024-01-08 (4 Comments)
re(2): Clarification needed (Question) by Charlie (2024-01-08 13:43:04)
Difficulty: 3 of 5Under Find the Last Two Digits (in Numbers)
Posted on 2024-01-07 (2 Comments)
Solution computer solution by Charlie (2024-01-07 09:07:39)
Difficulty: 3 of 5Under What Are These Numbers? (in Numbers)
Posted on 2024-01-06 (2 Comments)
Solution computer solution by Charlie (2024-01-06 09:35:12)
Difficulty: 3 of 5Under Nonnegative Integer Crossed Prime Puzzle (in Numbers)
Posted on 2024-01-05 (6 Comments)
Some Thoughts computer exploration--no proof of completeness by Charlie (2024-01-05 08:55:30)
Difficulty: 3 of 5Under Area / Perimeter Ratio (in Numbers)
Posted on 2024-01-04 (5 Comments)
Some Thoughts partial solution by Charlie (2024-01-04 08:56:35)
Difficulty: 3 of 5Under Square Heronian (in Shapes)
Posted on 2024-01-02 (1 Comments)
Solution computer attempt; researched answer (spoiler) by Charlie (2024-01-02 13:26:33)
Difficulty: 3 of 5Under Two Candles (in General)
Posted on 2024-01-02 (4 Comments)
Solution solution by Charlie (2024-01-02 08:57:01)
Difficulty: 3 of 5Under Words like swords (in Word Problems)
Posted on 2024-01-01 (4 Comments)
Some Thoughts From the SyFy network by Charlie (2024-01-01 19:40:38)
Some Thoughts Two famous sayings that might qualify. by Charlie (2024-01-01 08:22:00)
Difficulty: 3 of 5Under Pete and Jimmy (in Probability)
Posted on 2023-12-29 (8 Comments)
Solution computer solution by Charlie (2023-12-29 13:11:42)
Difficulty: 3 of 5Under Triangular Cube (in Numbers)
Posted on 2023-12-29 (2 Comments)
Solution computer solution by Charlie (2023-12-29 08:56:36)
Difficulty: 3 of 5Under Total Number of Real Solutions (in Just Math)
Posted on 2023-12-28 (2 Comments)
Solution the number, and the solution by Charlie (2023-12-28 09:17:28)
Difficulty: 2 of 5Under Square root and cubic root equality (in Just Math)
Posted on 2023-12-27 (4 Comments)
re: Solution by Charlie (2023-12-27 07:52:07)
Solution solution by Charlie (2023-12-27 07:42:48)
Difficulty: 3 of 5Under Filtering a phrase (in Word Problems)
Posted on 2023-12-25 (1 Comments)
Some Thoughts computer solution by Charlie (2023-12-25 19:38:26)
Difficulty: 3 of 5Under Solving a System of Equations with Real Numbers (in Just Math)
Posted on 2023-12-25 (2 Comments)
Solution solve with Wolfram Alpha by Charlie (2023-12-25 13:12:27)
Difficulty: 3 of 5Under Consecutive (in Sequences)
Posted on 2023-12-25 (2 Comments)
Solution computer solution by Charlie (2023-12-25 09:00:01)
Difficulty: 3 of 5Under Piling Stones (in Just Math)
Posted on 2023-12-23 (5 Comments)
Solution solution by Charlie (2023-12-23 13:32:21)
Difficulty: 3 of 5Under 2 Power Crossed Perfect Power Puzzle (in Numbers)
Posted on 2023-12-23 (4 Comments)
re: Analytic solution by Charlie (2023-12-23 11:40:18)
Solution computer solution by Charlie (2023-12-23 09:46:14)
Difficulty: 3 of 5Under Cyclic maximization (in Just Math)
Posted on 2023-12-21 (2 Comments)
Solution computer solution by Charlie (2023-12-21 09:27:01)
Difficulty: 3 of 5Under Consecutive cosines (in Just Math)
Posted on 2023-12-20 (1 Comments)
observation -- probably obvious -- not a proof by Charlie (2023-12-20 11:23:04)
Difficulty: 3 of 5Under Given Leaning Ladder, Get the Base (in Shapes)
Posted on 2023-12-19 (1 Comments)
Solution solution by Charlie (2023-12-19 09:30:55)
Difficulty: 3 of 5Under Add to Cube, get Square 2 (in Numbers)
Posted on 2023-12-18 (1 Comments)
Solution computer solution by Charlie (2023-12-18 12:38:20)
Difficulty: 3 of 5Under 100 times a Sawtooth Integral (in Calculus)
Posted on 2023-12-18 (3 Comments)
comment by Charlie (2023-12-18 09:24:30)
Difficulty: 3 of 5Under People (in Word Problems)
Posted on 2023-12-17 (20 Comments)
#8 even with only one S by Charlie (2023-12-18 12:33:13)
#1 by Charlie (2023-12-18 12:16:13)
2 by Charlie (2023-12-18 12:06:59)
Difficulty: 3 of 5Under Square and Prime (in Numbers)
Posted on 2023-12-16 (2 Comments)
Solution computer solution by Charlie (2023-12-16 13:32:41)
Difficulty: 3 of 5Under Testing Time Treat (in Probability)
Posted on 2023-12-15 (3 Comments)
Solution solution by Charlie (2023-12-15 13:46:03)
Difficulty: 3 of 5Under Old Foskins (in General)
Posted on 2023-12-14 (5 Comments)
Solution most likely answer by Charlie (2023-12-14 14:13:49)
Difficulty: 3 of 5Under Square the GCD, get the Sum (in Numbers)
Posted on 2023-12-13 (1 Comments)
Some Thoughts computer findings by Charlie (2023-12-14 08:11:43)
Difficulty: 3 of 5Under 200 Candies (in General)
Posted on 2023-12-12 (9 Comments)
re: simulation with new interpretation by Charlie (2023-12-13 15:26:03)
Solution simulation with new interpretation by Charlie (2023-12-13 07:46:47)
re(2): simulation by Charlie (2023-12-12 19:27:00)
Solution simulation by Charlie (2023-12-12 14:32:28)
Difficulty: 3 of 5Under Infinitely Continued String of Perfect Cubes (in Numbers)
Posted on 2023-12-12 (2 Comments)
Solution computer solution by Charlie (2023-12-12 09:31:47)
Difficulty: 3 of 5Under Year Yearn 6 (in Numbers)
Posted on 2023-12-11 (2 Comments)
Solution computer solution by Charlie (2023-12-11 08:32:07)
Difficulty: 3 of 5Under Some Powers Sum 328 (in Numbers)
Posted on 2023-12-10 (4 Comments)
Solution computer solution by Charlie (2023-12-10 09:52:24)
Difficulty: 3 of 5Under Triple angle perimeter minimized (in Geometry)
Posted on 2023-12-08 (2 Comments)
Solution computer solution by Charlie (2023-12-08 08:48:07)
Difficulty: 3 of 5Under Bug on a Cube 3 (in Probability)
Posted on 2023-12-05 (3 Comments)
Solution computer solution via simulation by Charlie (2023-12-05 10:41:28)
Difficulty: 3 of 5Under Lighthouse Kerfuffle (in Probability)
Posted on 2023-12-02 (2 Comments)
Some Thoughts this is what I get by Charlie (2023-12-03 08:51:53)
Difficulty: 3 of 5Under Airport Codes (in Word Problems)
Posted on 2023-11-30 (4 Comments)
Solution computer solution including international codes by Charlie (2023-11-30 10:35:46)
Difficulty: 2 of 5Under Who gave what to whom? (in Logic)
Posted on 2023-11-28 (7 Comments)
Solution computer solution by Charlie (2023-11-28 14:43:37)
Difficulty: 3 of 5Under Letter Equation Surmise (in General)
Posted on 2023-11-28 (12 Comments)
re: iii) soln by Charlie (2023-11-28 08:58:36)
Difficulty: 3 of 5Under Bug on a Cube 2 (in Probability)
Posted on 2023-11-27 (5 Comments)
re: computer solution by Charlie (2023-11-27 14:00:57)
Solution computer solution by Charlie (2023-11-27 13:56:24)
Difficulty: 2 of 5Under Lighthouse Crossed Three Lights Mashup (in General)
Posted on 2023-11-27 (3 Comments)
Solution solution by Charlie (2023-11-27 09:21:32)
Difficulty: 2 of 5Under Power growth (in Just Math)
Posted on 2023-11-26 (3 Comments)
Solution computer solution by Charlie (2023-11-26 09:15:18)
Difficulty: 3 of 5Under Embedded Digital Product (in Numbers)
Posted on 2023-11-25 (2 Comments)
list of available digit sets by Charlie (2023-11-25 14:03:01)
Some Thoughts method of solution by Charlie (2023-11-25 13:46:18)
Difficulty: 3 of 5Under Bug on a Cube (in Probability)
Posted on 2023-11-19 (2 Comments)
Solution some analytic, some computer by Charlie (2023-11-19 13:08:53)
Difficulty: 3 of 5Under Find all possible pairs (in Just Math)
Posted on 2023-11-19 (2 Comments)
Some Thoughts computer exploration by Charlie (2023-11-19 09:33:18)
Difficulty: 3 of 5Under Last two digits (in Just Math)
Posted on 2023-11-18 (2 Comments)
Solution computer solution by Charlie (2023-11-18 10:09:12)
Difficulty: 3 of 5Under A Limit of Sum Expressions (in Numbers)
Posted on 2023-11-16 (2 Comments)
Solution solution by Charlie (2023-11-16 09:46:42)
Difficulty: 3 of 5Under A square is a square (in Numbers)
Posted on 2023-11-15 (3 Comments)
Solution computer solution by Charlie (2023-11-15 11:32:53)
Difficulty: 3 of 5Under ABCDEABCDEABCDE is one (in Numbers)
Posted on 2023-11-14 (3 Comments)
Solution solution by Charlie (2023-11-14 14:46:20)
Difficulty: 3 of 5Under Ten Squares (in Numbers)
Posted on 2023-11-13 (4 Comments)
computer findings by Charlie (2023-11-13 15:58:31)
Difficulty: 3 of 5Under Pandigital and Pretty Powerful VI (in Numbers)
Posted on 2023-11-13 (3 Comments)
if the puzzle had allowed N=2 by Charlie (2023-11-13 09:56:11)
Solution computer solution by Charlie (2023-11-13 09:24:27)
Difficulty: 2 of 5Under Smells Trigonometric (in Just Math)
Posted on 2023-11-12 (4 Comments)
re(2): based on Wolfram Alpha by Charlie (2023-11-13 06:23:11)
Solution based on Wolfram Alpha by Charlie (2023-11-12 15:31:22)
Difficulty: 3 of 5Under Minimum Value Muse 3 (in Numbers)
Posted on 2023-11-12 (2 Comments)
Solution computer solution by Charlie (2023-11-12 08:56:56)
Difficulty: 3 of 5Under Additively Quadratic 2 (in Numbers)
Posted on 2023-11-11 (4 Comments)
Some Thoughts re: Is this a finite set? by Charlie (2023-11-11 12:36:23)
Some Thoughts Is this a finite set? by Charlie (2023-11-11 09:35:24)
Difficulty: 3 of 5Under House Numbers on the Clock Street (in Numbers)
Posted on 2023-11-10 (1 Comments)
Solution computer solution by Charlie (2023-11-10 13:31:29)
Difficulty: 3 of 5Under Two cases (in Sequences)
Posted on 2023-11-10 (4 Comments)
Some Thoughts computer solution for part II only by Charlie (2023-11-10 07:53:23)
Difficulty: 3 of 5Under Four Squares II (in Numbers)
Posted on 2023-11-09 (2 Comments)
Some Thoughts computer exploration by Charlie (2023-11-09 18:18:25)
Difficulty: 3 of 5Under Rex and Ralph's Math Competition (in Numbers)
Posted on 2023-11-08 (2 Comments)
Solution computer solution by Charlie (2023-11-08 13:20:02)
Difficulty: 3 of 5Under Fibonacci Tail 2 (in Numbers)
Posted on 2023-11-08 (2 Comments)
Solution computer solution by Charlie (2023-11-08 09:06:56)
Difficulty: 3 of 5Under complex trigonometry (in Just Math)
Posted on 2023-11-07 (2 Comments)
just the calculated answer -- no insight by Charlie (2023-11-07 10:31:42)
Difficulty: 3 of 5Under Numbers in pi 2 (in Numbers)
Posted on 2023-11-05 (7 Comments)
re: new solution -- Matlab confirmation by Charlie (2023-11-07 07:02:43)
re: Different answer by Charlie (2023-11-06 21:27:33)
Difficulty: 2 of 5Under Some Even and Odd Crossed Difference (in Numbers)
Posted on 2023-11-03 (3 Comments)
re: Possible Solution -- computer verification by Charlie (2023-11-03 08:02:17)
Difficulty: 3 of 5Under Eight Pandigital Primes (in Numbers)
Posted on 2023-11-02 (5 Comments)
re: Solution by Charlie (2023-11-02 18:09:13)
Difficulty: 3 of 5Under One-tenth Power Problem (in Numbers)
Posted on 2023-11-02 (3 Comments)
re: solution by Charlie (2023-11-02 09:35:16)
Solution solution by Charlie (2023-11-02 08:56:23)
Difficulty: 3 of 5Under 96 Tees (in Numbers)
Posted on 2023-11-01 (2 Comments)
re: computer solution by Charlie (2023-11-01 16:03:05)
Solution computer solution by Charlie (2023-11-01 15:52:56)
Difficulty: 3 of 5Under Reversible P and P^2 (in Numbers)
Posted on 2023-10-31 (4 Comments)
re: No Subject by Charlie (2023-10-31 13:52:44)
Difficulty: 4 of 5Under LCM and Equality Puzzle 2 (in Just Math)
Posted on 2023-10-31 (2 Comments)
Some Thoughts exploration-- no proof by Charlie (2023-10-31 08:35:02)
Difficulty: 3 of 5Under Count the acceptable permutations (in Numbers)
Posted on 2023-10-30 (3 Comments)
Some Thoughts computer exploration -- no proof -- spoiler by Charlie (2023-10-30 12:08:50)
Difficulty: 3 of 5Under Sum of the Digits 2 (in Numbers)
Posted on 2023-10-27 (4 Comments)
Solution looking ahead by Charlie (2023-10-27 12:52:57)
Difficulty: 3 of 5Under Given the sum of sec and tan, Find the value of csc and cot (in Just Math)
Posted on 2023-10-27 (5 Comments)
Solution computer answer by Charlie (2023-10-27 08:39:51)
Difficulty: 3 of 5Under Hexagon Picking Probability (in Shapes)
Posted on 2023-10-25 (7 Comments)
Solution my numerical integration by Charlie (2023-10-26 07:58:07)
re: Computer solution by Charlie (2023-10-25 15:16:39)
Difficulty: 3 of 5Under 1000 point star (in General)
Posted on 2023-10-25 (6 Comments)
Solution solution by Charlie (2023-10-25 08:55:29)
Difficulty: 3 of 5Under Consider Prime Numbers, Get Cube (in Numbers)
Posted on 2023-10-24 (7 Comments)
Solution computer solution by Charlie (2023-10-24 08:49:46)
Difficulty: 3 of 5Under Super Exponentiation Surmise IV (in Just Math)
Posted on 2023-10-23 (2 Comments)
Solution solution by Charlie (2023-10-23 14:11:14)
Difficulty: 3 of 5Under Power Crossed Expression Evaluation (in Numbers)
Posted on 2023-10-22 (3 Comments)
Some Thoughts possible solution by Charlie (2023-10-22 09:48:39)
Difficulty: 3 of 5Under Conjoined Twins (in Numbers)
Posted on 2023-10-20 (3 Comments)
Solution computer solution by Charlie (2023-10-20 12:34:16)
Difficulty: 3 of 5Under Ratio Expression Evaluation (in Numbers)
Posted on 2023-10-19 (4 Comments)
Solution short computer solution by Charlie (2023-10-19 17:07:16)
Difficulty: 3 of 5Under EMIRP pair inside a PRIME (in Numbers)
Posted on 2023-10-19 (1 Comments)
Solution computer solution by Charlie (2023-10-19 10:02:26)
Difficulty: 3 of 5Under Integer Diagonal (in Numbers)
Posted on 2023-10-18 (4 Comments)
re(2): Computer solution by Charlie (2023-10-18 16:08:39)
re: Computer solution by Charlie (2023-10-18 15:50:22)
Solution hmmm... a sort-of computer solution (spoiler) by Charlie (2023-10-18 12:08:24)
Difficulty: 3 of 5Under Quadratic and Cubic Expression Quickie (in Just Math)
Posted on 2023-10-17 (2 Comments)
Solution computer solution by Charlie (2023-10-17 17:50:22)
Difficulty: 3 of 5Under Super Exponentiation Surmise III (in Just Math)
Posted on 2023-10-17 (2 Comments)
Solution solution by Charlie (2023-10-17 13:58:13)
Solution solution by Charlie (2023-10-17 09:34:49)
Difficulty: 3 of 5Under Digital Sum Triples (in Numbers)
Posted on 2023-10-15 (2 Comments)
Solution computer solution by Charlie (2023-10-15 10:14:32)
Difficulty: 3 of 5Under Inverse Crossed Linear Power (in Just Math)
Posted on 2023-10-14 (9 Comments)
Solution solution by Charlie (2023-10-14 10:41:40)
Difficulty: 3 of 5Under Swamp Length From Computed Angles (in General)
Posted on 2023-10-13 (7 Comments)
re(2): solution by Charlie (2023-10-13 14:00:33)
Solution solution by Charlie (2023-10-13 12:24:45)
Difficulty: 3 of 5Under Multiples of Powers (in Numbers)
Posted on 2023-10-12 (4 Comments)
re(2): solution by Charlie (2023-10-15 22:21:45)
Solution solution by Charlie (2023-10-12 07:56:47)
Difficulty: 3 of 5Under Digits of N^6 (in Numbers)
Posted on 2023-10-11 (3 Comments)
re: Computer solution by Charlie (2023-10-11 10:28:43)
Difficulty: 3 of 5Under n-Pandigital and k-Divisible (in Numbers)
Posted on 2023-10-08 (1 Comments)
Solution computer solution by Charlie (2023-10-08 12:58:55)
Difficulty: 3 of 5Under How Mean Is It? (in Just Math)
Posted on 2023-10-07 (2 Comments)
Solution computer solution by Charlie (2023-10-07 09:41:15)
Difficulty: 3 of 5Under Fourteen Neighbor Nuance (in Logic)
Posted on 2023-10-06 (6 Comments)
Solution computer-aided solution by Charlie (2023-10-06 09:24:24)
Difficulty: 3 of 5Under Mystery Number Nuance (in Numbers)
Posted on 2023-10-05 (1 Comments)
Solution solution (mostly computer) by Charlie (2023-10-05 15:05:41)
Difficulty: 4 of 5Under Curvey Weirdness (in Calculus)
Posted on 2023-10-05 (2 Comments)
Some Thoughts graphical computer exploration by Charlie (2023-10-05 09:08:44)
Difficulty: 3 of 5Under 2x4 = 4x2 (in Numbers)
Posted on 2023-10-04 (2 Comments)
Solution computer and visual selection by Charlie (2023-10-04 09:14:50)
Difficulty: 3 of 5Under Special demands (in Just Math)
Posted on 2023-10-02 (7 Comments)
re(3): solution by Charlie (2023-10-02 21:53:33)
re(2): solution by Charlie (2023-10-02 21:21:22)
Solution solution by Charlie (2023-10-02 15:35:58)
Difficulty: 2 of 5Under All possible integer values of N (in Numbers)
Posted on 2023-10-02 (3 Comments)
Solution solution by Charlie (2023-10-02 09:24:48)
Difficulty: 3 of 5Under Solve in Integers (in Numbers)
Posted on 2023-10-01 (5 Comments)
re(2): presumably all of them. by Charlie (2023-10-01 09:55:31)
Some Thoughts presumably all of them. by Charlie (2023-10-01 08:28:41)
Difficulty: 3 of 5Under Sock Sorting Space (in Probability)
Posted on 2023-09-30 (2 Comments)
Some Thoughts random trials of one million each n by Charlie (2023-09-30 12:59:31)
Difficulty: 3 of 5Under What number is ALUMINE? (in Numbers)
Posted on 2023-09-30 (7 Comments)
Question re: Me think , it’s d0 by Charlie (2023-09-30 08:31:28)
Solution computer solution by Charlie (2023-09-30 08:28:34)
Difficulty: 3 of 5Under Near powers (in Numbers)
Posted on 2023-09-28 (2 Comments)
computer solution -- no proof of uniqueness by Charlie (2023-09-28 12:32:28)
Difficulty: 3 of 5Under Double the Digits (in Numbers)
Posted on 2023-09-28 (2 Comments)
Solution computer solution by Charlie (2023-09-28 08:47:43)
Difficulty: 3 of 5Under Five Pins on a Board (in Probability)
Posted on 2023-09-27 (3 Comments)
If the randomization area were a circle rather than a square by Charlie (2023-09-27 22:17:10)
re: No Subject by Charlie (2023-09-27 20:43:17)
Solution No Subject by Charlie (2023-09-27 15:05:10)
Difficulty: 2 of 5Under Naughty Nimble Nines 2 (in Numbers)
Posted on 2023-09-27 (6 Comments)
re: One more by Charlie (2023-09-27 09:57:05)
Solution a solution by Charlie (2023-09-27 08:39:58)
Difficulty: 3 of 5Under Ratio Difference Crossed Value Determination (in Just Math)
Posted on 2023-09-26 (3 Comments)
Solution computer-assisted answer by Charlie (2023-09-26 08:39:31)
Difficulty: 3 of 5Under Splitting Words 2 (in Word Problems)
Posted on 2023-09-25 (1 Comments)
Solution computer solution by Charlie (2023-09-25 14:08:12)
Difficulty: 2 of 5Under Integers only (in Sequences)
Posted on 2023-09-25 (6 Comments)
re: Solution by Charlie (2023-09-25 08:44:01)
Solution Hunting for x by Charlie (2023-09-25 08:39:48)
Difficulty: 3 of 5Under Consider the Value, Get Solution (in Numbers)
Posted on 2023-09-24 (2 Comments)
Some Thoughts answer -- no proof by Charlie (2023-09-24 12:51:36)
Difficulty: 3 of 5Under Checking the quantity (in Numbers)
Posted on 2023-09-23 (8 Comments)
re(2): Puzzle Answer by Charlie (2023-09-24 07:27:17)
Some Thoughts my computer findings by Charlie (2023-09-23 20:05:21)
Difficulty: 2 of 5Under Concatenated Pandigital (in Numbers)
Posted on 2023-09-23 (2 Comments)
Solution computer solution by Charlie (2023-09-23 08:58:01)
Difficulty: 3 of 5Under Factorial Crossed Perfect Square Settlement (in Numbers)
Posted on 2023-09-21 (56 Comments)
Solution computer solution by Charlie (2023-09-21 09:20:34)
Difficulty: 4 of 5Under Inserting a number into 2023 (in Numbers)
Posted on 2023-09-20 (2 Comments)
Solution computer solutions (a and b) by Charlie (2023-09-20 13:00:24)
Difficulty: 3 of 5Under Marquez's Equation 2 (in Numbers)
Posted on 2023-09-20 (2 Comments)
Solution computer solution by Charlie (2023-09-20 11:10:14)
Difficulty: 3 of 5Under Reversing Minute Hand Clock (in Just Math)
Posted on 2023-09-19 (1 Comments)
Solution solution by Charlie (2023-09-19 08:27:49)
Difficulty: 3 of 5Under What is the Time? (in General)
Posted on 2023-09-12 (10 Comments)
re: computer-aided solution by Charlie (2023-09-12 10:37:46)
Solution computer-aided solution by Charlie (2023-09-12 09:07:15)
Difficulty: 2 of 5Under Accuracy Ascertainment (in Probability)
Posted on 2023-09-11 (6 Comments)
re: Extra Challenge Accepted (spoiler) by Charlie (2023-09-13 06:58:04)
Solution computer-aided solution by Charlie (2023-09-11 09:13:13)
Difficulty: 1 of 5Under Clock Time Consideration (in General)
Posted on 2023-09-10 (9 Comments)
for the full 12 hours by Charlie (2023-09-10 22:08:12)
Difficulty: 3 of 5Under Even and Odd Digit Numbers (in Numbers)
Posted on 2023-09-08 (2 Comments)
Solution going from perfect squares to their divisors by Charlie (2023-09-08 11:37:35)
Difficulty: 3 of 5Under Unique and restricted (in Word Problems)
Posted on 2023-09-06 (10 Comments)
re: No Subject by Charlie (2023-09-07 10:06:53)
re(4): computer solution showing valid words by Charlie (2023-09-06 23:24:07)
re(2): computer solution showing valid words by Charlie (2023-09-06 16:06:36)
Solution Words and solutions from the program by Charlie (2023-09-06 13:51:28)
Solution computer solution showing valid words by Charlie (2023-09-06 13:48:31)
Difficulty: 2 of 5Under The tangent formula (in Just Math)
Posted on 2023-09-06 (1 Comments)
Solution heuristic "proof" by Charlie (2023-09-06 08:53:09)
Difficulty: 3 of 5Under A distorted chessboard (in Shapes)
Posted on 2023-09-05 (3 Comments)
Solution computer solution by Charlie (2023-09-05 12:51:43)
Difficulty: 3 of 5Under Digital Product Triples (in Numbers)
Posted on 2023-09-05 (4 Comments)
re: Computer solution by Charlie (2023-09-05 21:20:49)
computer findings by Charlie (2023-09-05 09:35:07)
Difficulty: 3 of 5Under Side constraint for maximizing area (in Just Math)
Posted on 2023-09-04 (7 Comments)
Solution computer approximation by Charlie (2023-09-04 12:27:26)
Difficulty: 3 of 5Under Matrix probability (in Probability)
Posted on 2023-09-03 (2 Comments)
Solution computer solution (spoiler) by Charlie (2023-09-03 12:13:26)
Difficulty: 2 of 5Under Powerful Parade (in Numbers)
Posted on 2023-09-03 (5 Comments)
re: I might be wrong but... by Charlie (2023-09-03 10:40:16)
Difficulty: 3 of 5Under A Quick Game with His Children (in Numbers)
Posted on 2023-09-02 (9 Comments)
Solution solution by Charlie (2023-09-02 09:21:30)
Difficulty: 3 of 5Under Radical Real Value Resolution (in Just Math)
Posted on 2023-09-01 (2 Comments)
Solution computer solution by Charlie (2023-09-01 12:03:55)
Difficulty: 3 of 5Under The Exam (in Logic)
Posted on 2023-08-31 (7 Comments)
Solution computer solution by Charlie (2023-08-31 09:07:10)
Difficulty: 3 of 5Under Ten not welcomed... (in Probability)
Posted on 2023-08-30 (2 Comments)
Solution solution by Charlie (2023-08-30 10:00:27)
Difficulty: 4 of 5Under Counting the Tilings (in Shapes)
Posted on 2023-08-29 (2 Comments)
re: Solution by Charlie (2023-08-29 13:28:47)
Difficulty: 3 of 5Under Book page number (in Just Math)
Posted on 2023-08-29 (6 Comments)
re: Analytic solution by Charlie (2023-08-30 07:49:18)
Solution computer solution with complete list by Charlie (2023-08-29 08:52:33)
Difficulty: 2 of 5Under Easy rhombus angle measurement (in Geometry)
Posted on 2023-08-26 (1 Comments)
Solution GSP answer by Charlie (2023-08-26 21:25:57)
Difficulty: 3 of 5Under It is not 49 (in General)
Posted on 2023-08-26 (3 Comments)
Solution computer solution by Charlie (2023-08-26 07:47:07)
Difficulty: 3 of 5Under A clock area (in Just Math)
Posted on 2023-08-23 (6 Comments)
Solution computer solution by Charlie (2023-08-23 14:58:30)
Difficulty: 2 of 5Under Near pi Equation Solution Settlement (in Just Math)
Posted on 2023-08-23 (3 Comments)
Solution What Wolfrm Alpha says by Charlie (2023-08-24 09:53:23)
Difficulty: 3 of 5Under Sum Six Digit Even Numbers (in Numbers)
Posted on 2023-08-22 (4 Comments)
re: different answer by Charlie (2023-08-22 14:49:03)
Solution different answer by Charlie (2023-08-22 14:34:46)
Difficulty: 2 of 5Under Counting triplets (in Numbers)
Posted on 2023-08-22 (3 Comments)
Solution solution by Charlie (2023-08-22 09:35:24)
Difficulty: 3 of 5Under Logic of pets (in Logic)
Posted on 2023-08-21 (5 Comments)
Solution computer solution (spoiler) by Charlie (2023-08-21 11:03:56)
Difficulty: 3 of 5Under Minimum distance between sets (in Just Math)
Posted on 2023-08-21 (1 Comments)
Solution answer (spoiler) by Charlie (2023-08-21 08:56:10)
Difficulty: 3 of 5Under Another Couple 2 (in Word Problems)
Posted on 2023-08-20 (2 Comments)
Some Thoughts from my wordlist by Charlie (2023-08-20 09:30:04)
Difficulty: 2 of 5Under Find this 4C4V word (in Word Problems)
Posted on 2023-08-19 (6 Comments)
re(2): computer solution by Charlie (2023-08-26 07:52:46)
Solution computer solution by Charlie (2023-08-19 14:45:32)
Difficulty: 3 of 5Under Given the Vertices, Find the Area (in Shapes)
Posted on 2023-08-19 (4 Comments)
Solution solution by Charlie (2023-08-19 08:10:23)
Question question by Charlie (2023-08-19 06:27:58)
Difficulty: 3 of 5Under Powers of the Digits (in Numbers)
Posted on 2023-08-18 (2 Comments)
Solution computer-aided solution by Charlie (2023-08-18 13:18:23)
Difficulty: 3 of 5Under Square Crossed Linear Expression Poser (in Numbers)
Posted on 2023-08-18 (2 Comments)
computer findings by Charlie (2023-08-18 08:58:10)
Difficulty: 3 of 5Under Continued Division and Parentheses Crossed Positive Integer Determination Poser (in Numbers)
Posted on 2023-08-16 (2 Comments)
Solution computer solution by Charlie (2023-08-16 14:03:26)
Difficulty: 2 of 5Under Cheap or expensive (in Numbers)
Posted on 2023-08-16 (3 Comments)
Solution from my word list by Charlie (2023-08-16 09:22:52)
Difficulty: 3 of 5Under World Capital Lexicon (in Word Problems)
Posted on 2023-08-15 (12 Comments)
9 by Charlie (2023-08-15 14:44:13)
5 by Charlie (2023-08-15 14:41:53)
6 by Charlie (2023-08-15 14:25:16)
Some Thoughts a small start by Charlie (2023-08-15 13:58:52)
Difficulty: 2 of 5Under Explore a diophantine equation (in Just Math)
Posted on 2023-08-14 (6 Comments)
Solution computer solution by Charlie (2023-08-14 09:03:19)
Difficulty: 3 of 5Under Value Validation II (in Just Math)
Posted on 2023-08-12 (2 Comments)
Solution my method by Charlie (2023-08-12 09:01:05)
Difficulty: 3 of 5Under A positive determinant (in Just Math)
Posted on 2023-08-11 (3 Comments)
Some Thoughts solution by Charlie (2023-08-11 22:54:03)
Difficulty: 3 of 5Under Some Near Pythagorean Integers Sum to Squares (in Numbers)
Posted on 2023-08-11 (3 Comments)
Solution computer solution by Charlie (2023-08-11 09:01:04)
Difficulty: 1 of 5Under Four Powers (in Just Math)
Posted on 2023-08-10 (2 Comments)
Solution solution by Charlie (2023-08-10 08:32:04)
Difficulty: 3 of 5Under Card rotation (in Just Math)
Posted on 2023-08-09 (3 Comments)
Solution solutions by Charlie (2023-08-09 09:20:31)
Difficulty: 3 of 5Under Maximize Rectangle on Semicircle in Triangle (in Calculus)
Posted on 2023-08-08 (4 Comments)
Solution solution by Charlie (2023-08-08 14:15:09)
Difficulty: 3 of 5Under Given the Function, Calculate the Value (in Just Math)
Posted on 2023-08-08 (4 Comments)
Solution re: computer solution -- decimal version by Charlie (2023-08-08 08:55:04)
Solution computer solution by Charlie (2023-08-08 08:46:00)
Difficulty: 3 of 5Under Sum Fractional Ratios (in Numbers)
Posted on 2023-08-07 (4 Comments)
Solution computer solution (spoiler) by Charlie (2023-08-07 12:27:14)
Difficulty: 2 of 5Under Scrap Merchant Travel Settlement (in General)
Posted on 2023-08-06 (4 Comments)
bare bones symbolic expressions by Charlie (2023-08-06 10:23:43)
Solution solution by Charlie (2023-08-06 09:59:48)
Difficulty: 2 of 5Under Four Sisters Crossed Birth Month Settlement (in Logic)
Posted on 2023-08-05 (2 Comments)
Solution computer solution by Charlie (2023-08-05 11:27:08)
Difficulty: 3 of 5Under Floor Crossed Integer Quintuplet Query (in Numbers)
Posted on 2023-08-04 (7 Comments)
Solution re(2): computer solution continued (last part) by Charlie (2023-08-04 12:54:51)
Solution re: computer solution continued by Charlie (2023-08-04 12:52:57)
Solution computer solution by Charlie (2023-08-04 12:47:05)
Difficulty: 4 of 5Under 3 perfect squares (in Just Math)
Posted on 2023-08-01 (6 Comments)
Solution computer solution by Charlie (2023-08-02 10:19:02)
Difficulty: 3 of 5Under Concatenated 3-digit integers Crossed Ratio Puzzle (in Numbers)
Posted on 2023-08-01 (3 Comments)
Solution computer solution by Charlie (2023-08-01 08:41:30)
Difficulty: 3 of 5Under Irrational powered equation (in Just Math)
Posted on 2023-07-30 (3 Comments)
Solution computer solution by Charlie (2023-07-30 16:30:32)
Difficulty: 3 of 5Under Logarithm Crossed Ordered Pairs Puzzle (in Just Math)
Posted on 2023-07-30 (4 Comments)
re: computer solution by Charlie (2023-07-30 10:08:52)
Solution computer solution by Charlie (2023-07-30 09:43:47)
Difficulty: 4 of 5Under Evened N and 3N Extended (in Numbers)
Posted on 2023-07-29 (4 Comments)
Solution same answer as Larry's by Charlie (2023-07-29 12:13:01)
Difficulty: 2 of 5Under 7-11 game payoffs (in Probability)
Posted on 2023-07-29 (2 Comments)
Solution solution by Charlie (2023-07-29 08:50:51)
Difficulty: 3 of 5Under Seven-digit Number (in Numbers)
Posted on 2023-07-28 (5 Comments)
Solution computer solution by Charlie (2023-07-28 12:25:19)
Difficulty: 3 of 5Under 521st Digit Determination (in Just Math)
Posted on 2023-07-28 (2 Comments)
Solution computer solution and an observation by Charlie (2023-07-28 09:31:58)
Difficulty: 2 of 5Under Derive a formula (in Just Math)
Posted on 2023-07-27 (3 Comments)
Solution computer solution by Charlie (2023-07-27 09:18:06)
Difficulty: 3 of 5Under Evaluate an area (in Shapes)
Posted on 2023-07-25 (4 Comments)
Solution same answer by Charlie (2023-07-25 12:02:56)
Difficulty: 3 of 5Under Permutation List 3 (in Numbers)
Posted on 2023-07-25 (3 Comments)
Solution solution by Charlie (2023-07-25 09:38:49)
Difficulty: 3 of 5Under Restricted ternary numbers (in Numbers)
Posted on 2023-07-24 (4 Comments)
Solution computer solution by Charlie (2023-07-24 11:58:42)
Difficulty: 3 of 5Under Consecutive inequality (in Numbers)
Posted on 2023-07-24 (3 Comments)
Solution Solution (spoiler) by Charlie (2023-07-24 08:15:57)
Difficulty: 3 of 5Under Simultaneous equation (in Just Math)
Posted on 2023-07-23 (2 Comments)
answer by Charlie (2023-07-23 11:25:54)
Difficulty: 3 of 5Under Identical Digit Baffle III (in Numbers)
Posted on 2023-07-22 (3 Comments)
Solution re: computer solution -- list continued by Charlie (2023-07-22 09:32:33)
Solution computer solution by Charlie (2023-07-22 09:28:03)
Difficulty: 2 of 5Under Divisor count ratio (in Just Math)
Posted on 2023-07-21 (3 Comments)
analytic incomplete but computer solved by Charlie (2023-07-21 12:57:40)
Difficulty: 3 of 5Under Squares in a 4x4 Grid (in Numbers)
Posted on 2023-07-21 (6 Comments)
re(2): Solution by Charlie (2023-07-21 10:52:00)
Solution computer solution by Charlie (2023-07-21 10:32:19)
Difficulty: 3 of 5Under Concatenate Three Primes, Make Six Primes (in Numbers)
Posted on 2023-07-20 (1 Comments)
Solution computer solution by Charlie (2023-07-20 13:55:46)
Difficulty: 3 of 5Under Five Distinct Prime Factors (in Numbers)
Posted on 2023-07-20 (1 Comments)
Solution computer solution (spoiler) by Charlie (2023-07-20 09:04:44)
Difficulty: 3 of 5Under String of 8s and Divisibility (in Numbers)
Posted on 2023-07-19 (3 Comments)
Solution solution by Charlie (2023-07-19 13:14:02)
Difficulty: 3 of 5Under Concentric Circles and a Chord (in Shapes)
Posted on 2023-07-19 (7 Comments)
Solution solution by Charlie (2023-07-19 08:19:47)
Difficulty: 3 of 5Under Twenty-third Power Posit (in Numbers)
Posted on 2023-07-18 (4 Comments)
Solution solution by Charlie (2023-07-18 08:29:26)
Difficulty: 3 of 5Under Change the First Digit, Get Three Primes (in Numbers)
Posted on 2023-07-17 (2 Comments)
Solution computer solution by Charlie (2023-07-17 09:58:15)
Difficulty: 3 of 5Under Center Six Digits (in Numbers)
Posted on 2023-07-15 (3 Comments)
Solution my program by Charlie (2023-07-15 10:33:28)
Difficulty: 3 of 5Under Only two digits (in Probability)
Posted on 2023-07-14 (5 Comments)
Solution Solution by Charlie (2023-07-14 11:56:35)
Some Thoughts re: simulation by Charlie (2023-07-14 11:48:10)
Some Thoughts simulation by Charlie (2023-07-14 09:37:54)
Difficulty: 3 of 5Under Some Decic Sin and Cos Sum to Rational Numbers (in Just Math)
Posted on 2023-07-12 (5 Comments)
Some Thoughts what I find by Charlie (2023-07-12 14:37:51)
Difficulty: 3 of 5Under How many zeros? (in Numbers)
Posted on 2023-07-12 (3 Comments)
Solution answer by Charlie (2023-07-12 08:23:46)
Difficulty: 3 of 5Under Squares and Cubes from Wooden Cubes (in Just Math)
Posted on 2023-07-11 (1 Comments)
Solution computer solution by Charlie (2023-07-11 14:02:42)
Difficulty: 2 of 5Under Triangle of Sticks (in Just Math)
Posted on 2023-07-11 (4 Comments)
Solution computer solution by Charlie (2023-07-11 09:28:31)
Difficulty: 4 of 5Under Finding 2022nd derivative (in Calculus)
Posted on 2023-07-07 (13 Comments)
patterns are elusive by Charlie (2023-07-07 12:16:36)
Difficulty: 3 of 5Under Dodecagon Based Pyramid (in Shapes)
Posted on 2023-07-06 (4 Comments)
my 2 cents by Charlie (2023-07-06 17:37:01)
Difficulty: 3 of 5Under Remainder Crossed Digit Permutation Resolution (in Numbers)
Posted on 2023-07-06 (3 Comments)
Solution computer-aided analysis by Charlie (2023-07-06 07:11:45)
Difficulty: 3 of 5Under Cubic Root Comparison (in Just Math)
Posted on 2023-07-05 (2 Comments)
Solution well it is a proof if you just solve it by Charlie (2023-07-06 17:41:53)
Difficulty: 4 of 5Under Let there be Light! (in Science)
Posted on 2023-07-04 (3 Comments)
Solution Solution (spoiler) by Charlie (2023-07-04 17:31:41)
Difficulty: 3 of 5Under Some Quartic Expressions Sum to Fourth Powers (in Numbers)
Posted on 2023-07-04 (2 Comments)
Solution solution by Charlie (2023-07-04 08:32:33)
Difficulty: 3 of 5Under 98 Crossed Sum of Digits Puzzle (in Numbers)
Posted on 2023-07-03 (6 Comments)
re: Analytic solution by Charlie (2023-07-03 14:12:24)
Solution computer solution by Charlie (2023-07-03 13:59:43)
Difficulty: 2 of 5Under What BIG is bigger? (in Just Math)
Posted on 2023-07-03 (4 Comments)
Solution a solution by Charlie (2023-07-03 08:56:30)
Difficulty: 3 of 5Under Three 3-digit Positive Integers (in Numbers)
Posted on 2023-07-02 (5 Comments)
Solution computer solution by Charlie (2023-07-02 14:13:24)
Difficulty: 3 of 5Under Add 1 to Exponent*Number, Get Square (in Numbers)
Posted on 2023-07-02 (2 Comments)
Some Thoughts computer findings by Charlie (2023-07-02 10:09:16)
Difficulty: 3 of 5Under Ingenious Sum Puzzle 2 (in Numbers)
Posted on 2023-07-01 (2 Comments)
(A) only (partial spoiler) by Charlie (2023-07-01 12:21:00)
Difficulty: 2 of 5Under Radar decoded (in Just Math)
Posted on 2023-07-01 (9 Comments)
re: Puzzle Answer by Charlie (2023-07-01 11:17:29)
Difficulty: 3 of 5Under Seventh Power Decision Settlement (in Numbers)
Posted on 2023-06-30 (3 Comments)
Solution computer solution by Charlie (2023-06-30 16:03:51)
Difficulty: 3 of 5Under Some Prime Fractions sum to Integer Fraction (in Numbers)
Posted on 2023-06-29 (4 Comments)
Some Thoughts computer exploration by Charlie (2023-06-29 09:41:25)
Difficulty: 3 of 5Under Try a tricky solution (in Just Math)
Posted on 2023-06-28 (6 Comments)
Solution computer solution by Charlie (2023-06-28 17:05:22)
Difficulty: 3 of 5Under Weight-loss Program Poser (in Numbers)
Posted on 2023-06-28 (3 Comments)
Solution computer solution by Charlie (2023-06-28 16:41:37)
Difficulty: 3 of 5Under Year Yearn 5 (in Algorithms)
Posted on 2023-06-28 (4 Comments)
Solution computer solution (spoiler) by Charlie (2023-06-28 08:42:31)
Difficulty: 3 of 5Under Golden Substitution (in Just Math)
Posted on 2023-06-27 (1 Comments)
Some Thoughts computer ev by Charlie (2023-06-27 13:18:55)
Difficulty: 3 of 5Under 2013 and Perfect Square Settlement (in Numbers)
Posted on 2023-06-25 (3 Comments)
Solution computer solution by Charlie (2023-06-25 16:42:37)
Difficulty: 4 of 5Under More solutions, please (in Just Math)
Posted on 2023-06-23 (5 Comments)
Some Thoughts computer findings by Charlie (2023-06-23 12:55:00)
Difficulty: 4 of 5Under Given Multiderivative Function, Find the value (in Calculus)
Posted on 2023-06-23 (2 Comments)
Solution computer solution by Charlie (2023-06-23 10:58:13)
Difficulty: 3 of 5Under Missing Tetradecimal Digits Determination (in Numbers)
Posted on 2023-06-22 (10 Comments)
Solution computer solution by Charlie (2023-06-22 13:43:26)
Difficulty: 3 of 5Under Some Linear Combination of Prime May Be a Perfect Square (in Numbers)
Posted on 2023-06-21 (2 Comments)
Some Thoughts an answer -- strictly speaking by Charlie (2023-06-21 12:55:18)
Difficulty: 2 of 5Under Minimizing disjoint sum (in Just Math)
Posted on 2023-06-20 (6 Comments)
Solution computer solution by Charlie (2023-06-20 14:04:12)
Difficulty: 3 of 5Under Terminating in Eight 8s (in Numbers)
Posted on 2023-06-20 (2 Comments)
Solution computer solution by Charlie (2023-06-20 09:26:16)
Difficulty: 3 of 5Under Divisible and not Divisible (in Numbers)
Posted on 2023-06-19 (3 Comments)
Solution computer solution by Charlie (2023-06-19 14:38:51)
Difficulty: 2 of 5Under Circle Constitution Crossed Person Removal Resolution (in Games)
Posted on 2023-06-19 (1 Comments)
Solution solution (spoiler) by Charlie (2023-06-19 09:20:34)
Difficulty: 1 of 5Under A teller of truth and lies (in Riddles)
Posted on 2023-06-17 (2 Comments)
Some Thoughts guesses by Charlie (2023-06-17 15:34:22)
Difficulty: 3 of 5Under Minimum and 2015 Multiple Muse (in Numbers)
Posted on 2023-06-16 (2 Comments)
Solution computer solution by Charlie (2023-06-16 10:52:21)
Difficulty: 3 of 5Under Three Linear Expressions Divide Three Exponent Expressions (in Numbers)
Posted on 2023-06-15 (4 Comments)
re: There is another solution. by Charlie (2023-06-20 10:36:01)
Some Thoughts computer exploration by Charlie (2023-06-15 09:41:33)
Difficulty: 3 of 5Under Four Smallest Prime Factor Sum Settlement (in Numbers)
Posted on 2023-06-14 (2 Comments)
re: computer solution -- without extended precision by Charlie (2023-06-14 22:15:31)
Solution computer solution by Charlie (2023-06-14 13:40:54)
Difficulty: 3 of 5Under The Count of Integers (in Numbers)
Posted on 2023-06-12 (3 Comments)
re: for integral r only (spoiler) by Charlie (2023-06-12 13:35:10)
Solution for integral r only (spoiler) by Charlie (2023-06-12 12:59:14)
Difficulty: 2 of 5Under Reciprocal Equation #8 (in Numbers)
Posted on 2023-06-11 (4 Comments)
Solution solution by Charlie (2023-06-11 09:37:04)
Difficulty: 4 of 5Under Preperiod and Period Poser (in Numbers)
Posted on 2023-06-09 (3 Comments)
Solution computer solution by Charlie (2023-06-09 13:21:15)
Difficulty: 2 of 5Under Ordinary Numbers (in Sequences)
Posted on 2023-06-09 (4 Comments)
Hints/Tips hint by Charlie (2023-06-10 14:26:49)
Difficulty: 3 of 5Under Pandigital Crossed Perfect Square Poser (in Numbers)
Posted on 2023-06-08 (2 Comments)
Solution computer solution by Charlie (2023-06-08 12:02:15)
Difficulty: 3 of 5Under Emirp Times (in Numbers)
Posted on 2023-06-07 (1 Comments)
Solution computer solution by Charlie (2023-06-07 15:13:43)
Difficulty: 4 of 5Under Coded Crossword 4 (in Cryptography)
Posted on 2023-06-07 (3 Comments)
Some Thoughts my best attempt by Charlie (2023-06-07 10:15:57)
Difficulty: 3 of 5Under Nested sin and cos equality (in Just Math)
Posted on 2023-06-05 (2 Comments)
re: computer solution by Charlie (2023-06-05 14:15:23)
Solution computer solution by Charlie (2023-06-05 13:43:41)
Difficulty: 2 of 5Under The determinant is divisible by three (in Just Math)
Posted on 2023-06-05 (5 Comments)
Solution solution by Charlie (2023-06-05 10:00:54)
Difficulty: 3 of 5Under Binomial and Floor Difference Crossed Division Determination (in Just Math)
Posted on 2023-06-03 (3 Comments)
re: Computer solution by Charlie (2023-06-03 12:07:38)
Difficulty: 4 of 5Under Friendly numbers (in Numbers)
Posted on 2023-06-02 (5 Comments)
#1 and a start at #4 and failed attempt at 2 by Charlie (2023-06-02 12:13:13)
Difficulty: 3 of 5Under Included in both A^B and B^A (in Numbers)
Posted on 2023-06-01 (1 Comments)
Solution computer solution by Charlie (2023-06-01 14:51:22)
Difficulty: 3 of 5Under Reveal the Quote (in Word Problems)
Posted on 2023-06-01 (4 Comments)
Solution solution by Charlie (2023-06-01 10:13:53)
Difficulty: 3 of 5Under Unsolved (so far) problem (in General)
Posted on 2023-05-31 (3 Comments)
Solution computer solution by Charlie (2023-05-31 10:01:45)
Difficulty: 3 of 5Under Maximum Polygon Area Ascertainment (in Shapes)
Posted on 2023-05-30 (4 Comments)
Solution solution by Charlie (2023-05-30 13:57:03)
Difficulty: 3 of 5Under Pandigital W numbers (in Numbers)
Posted on 2023-05-30 (4 Comments)
Solution solution by Charlie (2023-05-30 10:02:36)
Difficulty: 3 of 5Under Phrasing Frustration (in Word Problems)
Posted on 2023-05-29 (2 Comments)
Some Thoughts a couple of wild guesses by Charlie (2023-05-30 10:39:16)
Difficulty: 3 of 5Under Millionth Pandigital II (in Numbers)
Posted on 2023-05-29 (7 Comments)
Solution solution by Charlie (2023-05-29 11:34:57)
Difficulty: 3 of 5Under Given the ratio, Find the Sum (in Numbers)
Posted on 2023-05-25 (3 Comments)
Solution some more by Charlie (2023-05-25 13:57:59)
Difficulty: 3 of 5Under Pythagorean Crossed Six Consecutive Digit Determination (in Numbers)
Posted on 2023-05-24 (2 Comments)
Solution computer solution by Charlie (2023-05-24 12:44:36)
Difficulty: 2 of 5Under Quick estimate (in Numbers)
Posted on 2023-05-24 (11 Comments)
re: close by Charlie (2023-05-26 19:21:03)
close by Charlie (2023-05-26 18:32:14)
re: ….re(3): Not the solution -- indeed… by Charlie (2023-05-25 07:50:27)
re(2): Not the solution -- indeed. by Charlie (2023-05-24 16:09:21)
Solution re: Not the solution -- maybe it still is by Charlie (2023-05-24 11:36:25)
Not the solution by Charlie (2023-05-24 11:00:48)
Difficulty: 3 of 5Under Is this a Prime Number ? (in Numbers)
Posted on 2023-05-23 (2 Comments)
Solution solution by Charlie (2023-05-23 11:56:58)
Difficulty: 3 of 5Under He gave me S and asked for X (in Just Math)
Posted on 2023-05-23 (4 Comments)
re: more findings -- revised statistics by Charlie (2023-05-23 17:07:36)
re: more findings by Charlie (2023-05-23 16:40:02)
Some Thoughts computer findings by Charlie (2023-05-23 07:12:27)
Difficulty: 3 of 5Under From M to N (in Just Math)
Posted on 2023-05-22 (4 Comments)
re: Other 4-digit M values -- continued by Charlie (2023-05-22 12:58:51)
Other 4-digit M values by Charlie (2023-05-22 12:54:00)
Solution Part 2 by Charlie (2023-05-22 12:40:34)
Difficulty: 3 of 5Under Take Factorial Ratios, Get Minimum (in Numbers)
Posted on 2023-05-17 (3 Comments)
Solution computer solution -- Matlab by Charlie (2023-05-17 10:56:12)
Difficulty: 3 of 5Under Divisible by Prime Power (in Algorithms)
Posted on 2023-05-15 (1 Comments)
Solution computer solution by Charlie (2023-05-15 13:57:09)
Difficulty: 2 of 5Under Similar to Find My Number (in Probability)
Posted on 2023-05-15 (6 Comments)
Solution solution and commentary by Charlie (2023-05-15 08:02:01)
Difficulty: 3 of 5Under That's a lotta numbers! (2) (in Numbers)
Posted on 2023-05-14 (2 Comments)
Solution solution by Charlie (2023-05-14 10:08:27)
Difficulty: 3 of 5Under Unit square overlap I (in Calculus)
Posted on 2023-05-12 (7 Comments)
re: numeric solution by Charlie (2023-05-12 14:32:35)
Solution numeric solution by Charlie (2023-05-12 13:49:09)
Difficulty: 2 of 5Under The Railway Station Clock (in General)
Posted on 2023-05-12 (1 Comments)
Solution close enough by Charlie (2023-05-12 08:12:03)
Difficulty: 3 of 5Under Erase as much as needed (in Just Math)
Posted on 2023-05-11 (3 Comments)
Solution solution by Charlie (2023-05-11 10:00:24)
Difficulty: 2 of 5Under Large factor product (in Numbers)
Posted on 2023-05-10 (4 Comments)
Solution computer-based solution by Charlie (2023-05-10 15:07:12)
Difficulty: 3 of 5Under Rock smashing competition (in Probability)
Posted on 2023-05-08 (7 Comments)
Solution computer solution by Charlie (2023-05-08 14:22:56)
Difficulty: 3 of 5Under Ones and Twos (in Just Math)
Posted on 2023-05-04 (4 Comments)
Solution computer solution by Charlie (2023-05-04 15:36:03)
Difficulty: 4 of 5Under Pick 6 get power of 6 (in Numbers)
Posted on 2023-05-03 (9 Comments)
re(2): manual solution by Charlie (2023-05-04 15:52:24)
Solution corrected program and solution by Charlie (2023-05-04 15:45:58)
computer solution (spoiler) by Charlie (2023-05-03 16:26:21)
Difficulty: 3 of 5Under Mission impossible? (in Numbers)
Posted on 2023-05-02 (1 Comments)
Solution computer solution by Charlie (2023-05-02 14:46:36)
Difficulty: 3 of 5Under Prime squares with distinct digits 2 (in Numbers)
Posted on 2023-05-02 (2 Comments)
Solution computer solution by Charlie (2023-05-02 10:57:05)
Difficulty: 3 of 5Under Inconsiderable Fifth Power Finding (in Numbers)
Posted on 2023-04-30 (2 Comments)
Solution Solution (spoiler) by Charlie (2023-04-30 09:41:45)
Difficulty: 3 of 5Under Inscribed Polygon Crossed Root Side Resolution (in Shapes)
Posted on 2023-04-29 (6 Comments)
Solution re: my solution -- corrected by Charlie (2023-04-29 08:25:02)
solution by Charlie (2023-04-29 08:14:14)
Difficulty: 2 of 5Under A Complex Equation (in Just Math)
Posted on 2023-04-28 (4 Comments)
re: Puzzle Solution by Charlie (2023-04-28 14:18:21)
Difficulty: 3 of 5Under Digits of π in π^2 (in Numbers)
Posted on 2023-04-27 (1 Comments)
Solution computer solution by Charlie (2023-04-27 08:56:35)
Difficulty: 3 of 5Under Given Two sods, Find the sod (in Numbers)
Posted on 2023-04-26 (4 Comments)
Solution solution (conditional) by Charlie (2023-04-26 11:43:19)
Difficulty: 3 of 5Under A polynomial equation (in Just Math)
Posted on 2023-04-26 (8 Comments)
Solution computer solution by Charlie (2023-04-26 22:12:20)
Difficulty: 3 of 5Under Place Ten Positive Integers, Get Minimum (in Numbers)
Posted on 2023-04-25 (5 Comments)
Solution I think this is it by Charlie (2023-04-25 11:50:28)
Difficulty: 3 of 5Under Calling for ALL solutions (in Just Math)
Posted on 2023-04-24 (2 Comments)
Solution solution by Charlie (2023-04-24 11:34:19)
Difficulty: 1 of 5Under Cross Product Quickie (in Numbers)
Posted on 2023-04-24 (6 Comments)
Solution p&p by Charlie (2023-04-24 09:59:13)
Difficulty: 1 of 5Under Ay. ay. ay (in Just Math)
Posted on 2023-04-23 (3 Comments)
Solution computer approach by Charlie (2023-04-23 11:09:09)
Difficulty: 4 of 5Under 2023 (in General)
Posted on 2023-04-22 (1 Comments)
Solution computer solution by Charlie (2023-04-22 20:30:44)
Difficulty: 3 of 5Under Triple seven power (in Just Math)
Posted on 2023-04-21 (14 Comments)
Solution re(3): Errorless text Yes indeed -- computer solution by Charlie (2023-04-22 08:39:01)
Some Thoughts some computer findings by Charlie (2023-04-21 10:49:04)
Difficulty: 3 of 5Under Pandigital and Pretty Powerful V (in Numbers)
Posted on 2023-04-20 (2 Comments)
re: solution, I hope by Charlie (2023-04-20 22:06:24)
Solution solution, I hope by Charlie (2023-04-20 21:48:13)
Difficulty: 3 of 5Under Three Digit Integers Crossed 170 Multiple Muse (in Numbers)
Posted on 2023-04-19 (5 Comments)
some mod info by Charlie (2023-04-19 17:56:14)
Difficulty: 4 of 5Under Prime sums (in Numbers)
Posted on 2023-04-19 (3 Comments)
Solution computer solution by Charlie (2023-04-19 09:01:58)
Difficulty: 2 of 5Under Four Dozen Camper Conclusion (in Logic)
Posted on 2023-04-18 (3 Comments)
Solution solution by Charlie (2023-04-18 09:07:52)
Difficulty: 4 of 5Under What happens next? (in General)
Posted on 2023-04-17 (6 Comments)
Solution re(2): computer finding hint by Charlie (2023-04-17 15:27:07)
Some Thoughts computer finding by Charlie (2023-04-17 14:23:25)
Difficulty: 3 of 5Under Flooring a Floor-Ceiling Function (in Just Math)
Posted on 2023-04-17 (5 Comments)
Solution solution by Charlie (2023-04-17 10:02:32)
Difficulty: 4 of 5Under Product-Difference Crossed Power Poser (in Numbers)
Posted on 2023-04-15 (2 Comments)
Some Thoughts No Subject by Charlie (2023-04-15 10:58:47)
Difficulty: 3 of 5Under Quintic Minimum (in Numbers)
Posted on 2023-04-13 (4 Comments)
Best greedy algorithm I could find is nowhere near as good as Larry's algorithm by Charlie (2023-04-13 13:57:54)
Difficulty: 3 of 5Under Paint it Black and Blue (in Probability)
Posted on 2023-04-13 (1 Comments)
Solution solution (if I did it right) by Charlie (2023-04-13 10:16:24)
Difficulty: 3 of 5Under Roman WORD2NUM (in Word Problems)
Posted on 2023-04-12 (4 Comments)
re(2): what comes to mind and then computer help (spoilers) by Charlie (2023-04-13 14:24:19)
Solution what comes to mind and then computer help (spoilers) by Charlie (2023-04-12 14:09:08)
Difficulty: 3 of 5Under Nice infinite series (in Sequences)
Posted on 2023-04-11 (3 Comments)
Solution computer calculation and some observations by Charlie (2023-04-12 08:01:50)
Difficulty: 3 of 5Under Conjugate and radical equation (in Just Math)
Posted on 2023-04-11 (3 Comments)
Solution all values, via computer by Charlie (2023-04-11 15:13:43)
Difficulty: 3 of 5Under BCCDEFGGB and Perfect Square (in Numbers)
Posted on 2023-04-10 (3 Comments)
Solution computer solution by Charlie (2023-04-10 14:30:16)
Difficulty: 2 of 5Under Basic trigo equation (in Just Math)
Posted on 2023-04-10 (2 Comments)
Solution solution by Charlie (2023-04-10 10:38:22)
Difficulty: 3 of 5Under Carpe Diem (in Numbers)
Posted on 2023-04-07 (5 Comments)
re: The day this puzzle was posted by Charlie (2023-04-08 15:03:53)
part d by Charlie (2023-04-07 19:12:52)
re: checking Ady and a - c -- the programs by Charlie (2023-04-07 17:28:29)
Solution checking Ady and a - c by Charlie (2023-04-07 17:26:16)
Difficulty: 2 of 5Under Seems unlikely, but is not … (in Just Math)
Posted on 2023-04-06 (3 Comments)
re: Solution by Charlie (2023-04-07 06:31:44)
Difficulty: 3 of 5Under Signal Settlement (in Probability)
Posted on 2023-04-05 (5 Comments)
Solution re: solution -- if there were 4 transmissions by Charlie (2023-04-05 17:08:09)
Solution solution by Charlie (2023-04-05 16:59:39)
Difficulty: 2 of 5Under Special Indices II (in Numbers)
Posted on 2023-04-05 (3 Comments)
other "years" by Charlie (2023-04-05 10:13:29)
Difficulty: 2 of 5Under Factorials galore (in Sequences)
Posted on 2023-04-04 (2 Comments)
re: Puzzle Solution --- numeric verification by Charlie (2023-04-04 13:32:26)
Difficulty: 2 of 5Under Kebab Palace Casino Conclusion (in Probability)
Posted on 2023-04-04 (4 Comments)
Counting the ways another way by Charlie (2023-04-04 12:58:30)
Difficulty: 2 of 5Under Floored parabola (in Just Math)
Posted on 2023-04-03 (4 Comments)
Solution computer solution by Charlie (2023-04-03 09:03:53)
Difficulty: 1 of 5Under Special (int)ention (in Just Math)
Posted on 2023-04-02 (8 Comments)
re(2): solution by Charlie (2023-04-02 19:52:45)
Solution solution by Charlie (2023-04-02 10:46:32)
Difficulty: 3 of 5Under Power Crossed Cube Conclusion (in Numbers)
Posted on 2023-04-01 (3 Comments)
computer solution by Charlie (2023-04-01 11:29:11)
Difficulty: 3 of 5Under Faulty Calculator Frolic (in Numbers)
Posted on 2023-03-31 (4 Comments)
re: computer solution by Charlie (2023-03-31 13:50:39)
Solution computer solution by Charlie (2023-03-31 09:47:52)
Difficulty: 2 of 5Under An irrational answer (in Numbers)
Posted on 2023-03-30 (6 Comments)
re: Puzzle Solution by Charlie (2023-03-31 10:54:11)
re: Solution -- an interesting aside by Charlie (2023-03-30 10:22:57)
Difficulty: 3 of 5Under Another triangle in a square problem (in Geometry)
Posted on 2023-03-29 (4 Comments)
Solution my solution by Charlie (2023-03-29 21:52:20)
Difficulty: 3 of 5Under 52-card lottery (in Probability)
Posted on 2023-03-29 (11 Comments)
re: Part 1 and 2 solutions by Charlie (2023-03-29 10:52:26)
re: Part 2 (analytical corrected) by Charlie (2023-03-29 10:11:25)
re: Computer solution by Charlie (2023-03-29 09:54:38)
re: Parts 1 and 2 (analytical spoiler) by Charlie (2023-03-29 08:01:44)
Difficulty: 3 of 5Under More Arithmetic Integers II (in Numbers)
Posted on 2023-03-28 (2 Comments)
Solution computer solution by Charlie (2023-03-28 15:44:30)
Difficulty: 2 of 5Under Tea Team Quickie (in Numbers)
Posted on 2023-03-28 (3 Comments)
Some Thoughts well... by Charlie (2023-03-28 09:28:52)
Difficulty: 2 of 5Under Dart Discharge II (in Numbers)
Posted on 2023-03-27 (4 Comments)
Solution computer solution by Charlie (2023-03-27 09:31:53)
Difficulty: 3 of 5Under Sawtooth Crossed Ratio Resolution (in Numbers)
Posted on 2023-03-25 (3 Comments)
Solution computer methods by Charlie (2023-03-25 11:56:54)
Difficulty: 3 of 5Under Deux Duodecimal Prime Number Determination. (in Numbers)
Posted on 2023-03-24 (2 Comments)
Solution computer solution by Charlie (2023-03-24 08:27:06)
Difficulty: 3 of 5Under Power after power (in Just Math)
Posted on 2023-03-22 (3 Comments)
How to solve without really thinking... by Charlie (2023-03-22 13:22:57)
Difficulty: 3 of 5Under Eight Buttons (in General)
Posted on 2023-03-21 (2 Comments)
re: computer solution by Charlie (2023-03-21 17:26:29)
Solution computer solution by Charlie (2023-03-21 14:51:52)
Difficulty: 3 of 5Under Fifth Powers (in Just Math)
Posted on 2023-03-21 (3 Comments)
Some Thoughts computer exploration by Charlie (2023-03-21 09:48:42)
Difficulty: 3 of 5Under Mean Crossed Reversal Muse (in Numbers)
Posted on 2023-03-19 (3 Comments)
Solution computer solution by Charlie (2023-03-19 10:41:38)
Difficulty: 4 of 5Under 6 teams (in Probability)
Posted on 2023-03-17 (11 Comments)
re: an ambiguity? by Charlie (2023-03-17 10:30:06)
Solution computer solution and discussion by Charlie (2023-03-17 10:21:02)
Difficulty: 3 of 5Under Three Consecutive Letters in Order (in Word Problems)
Posted on 2023-03-15 (2 Comments)
Solution computer solution (Matlab) by Charlie (2023-03-15 14:21:58)
Difficulty: 3 of 5Under Comparing results (in Probability)
Posted on 2023-03-15 (1 Comments)
Solution computer solution by Charlie (2023-03-15 10:06:15)
Difficulty: 3 of 5Under Sum of two squares (in Numbers)
Posted on 2023-03-14 (4 Comments)
Solution computer solution by Charlie (2023-03-14 11:59:57)
Difficulty: 3 of 5Under Four For Dinner Identification (in Logic)
Posted on 2023-03-13 (2 Comments)
Solution computer solution by Charlie (2023-03-13 14:37:00)
Difficulty: 1 of 5Under Not on Earth, not on the sky (in Riddles)
Posted on 2023-03-13 (2 Comments)
possibility by Charlie (2023-03-13 10:35:37)
Difficulty: 3 of 5Under Duodecimal Digital Expansion Puzzle (in Numbers)
Posted on 2023-03-11 (3 Comments)
Solution solution by Charlie (2023-03-11 09:20:32)
Difficulty: 3 of 5Under World Series Gamble Settlement (in General)
Posted on 2023-03-09 (5 Comments)
re: Clarification by Charlie (2023-03-09 08:26:31)
Difficulty: 3 of 5Under Heptagon in a Square (in Shapes)
Posted on 2023-03-07 (13 Comments)
Solution re: Some thoughts -- a solution by Charlie (2023-03-08 10:36:37)
Difficulty: 3 of 5Under Stairway Ascension Ascertainment (in Numbers)
Posted on 2023-03-07 (6 Comments)
Solution computer solution by Charlie (2023-03-07 09:38:03)
Difficulty: 3 of 5Under Three Coin Consideration (in Logic)
Posted on 2023-03-03 (5 Comments)
re: Solution by Charlie (2023-03-03 13:12:35)
Solution computer solution by Charlie (2023-03-03 13:09:56)
Difficulty: 3 of 5Under Finding Two Calculator Fractions (in Numbers)
Posted on 2023-03-02 (4 Comments)
Solution solutions by Charlie (2023-03-02 15:38:38)
Difficulty: 2 of 5Under Two vending machines (in Probability)
Posted on 2023-03-02 (2 Comments)
Solution solution (spoiler) by Charlie (2023-03-02 07:40:38)
Difficulty: 3 of 5Under Super Exponentiation Surmise II (in Just Math)
Posted on 2023-03-01 (2 Comments)
Some Thoughts a graph by Charlie (2023-03-01 14:56:17)
Some Thoughts computer exploration by Charlie (2023-03-01 14:34:30)
Difficulty: 3 of 5Under Mr. Wolfingham's Fiancée (in Logic)
Posted on 2023-03-01 (5 Comments)
Solution computer solution by Charlie (2023-03-01 09:29:43)
Difficulty: 3 of 5Under WG’s quintuple (in Numbers)
Posted on 2023-02-28 (3 Comments)
Solution No Subject by Charlie (2023-02-28 15:37:26)
Difficulty: 3 of 5Under Four Credible Word Conclusion (in Word Problems)
Posted on 2023-02-28 (2 Comments)
Solution computer solution by Charlie (2023-02-28 09:37:31)
Difficulty: 3 of 5Under Some 2 Powers Sum to Factorial (in Numbers)
Posted on 2023-02-27 (5 Comments)
Some Thoughts without proof of completeness by Charlie (2023-02-27 12:46:52)
Difficulty: 2 of 5Under 3 integers (in Numbers)
Posted on 2023-02-27 (6 Comments)
re: Which did you have in mind? by Charlie (2023-02-27 08:38:01)
Difficulty: 3 of 5Under Evaluate x (in Just Math)
Posted on 2023-02-25 (4 Comments)
Solution two ways by Charlie (2023-02-25 08:18:35)
Difficulty: 4 of 5Under Reciprocal Equation #7 (in Numbers)
Posted on 2023-02-24 (4 Comments)
Solution solution by Charlie (2023-02-24 08:47:55)
Difficulty: 3 of 5Under Triplet Trouble (in Sequences)
Posted on 2023-02-23 (2 Comments)
program by Charlie (2023-02-23 20:35:02)
Difficulty: 3 of 5Under Skier and Force Formulation (in Science)
Posted on 2023-02-23 (6 Comments)
re(2): solution (sort of) by Charlie (2023-02-24 17:26:32)
solution (sort of) by Charlie (2023-02-23 09:06:18)
Difficulty: 3 of 5Under Heather's Fiancé (in Liars and Knights)
Posted on 2023-02-22 (2 Comments)
most of the solution by Charlie (2023-02-22 10:34:55)
Difficulty: 3 of 5Under Possible Pisano Poser? (in Numbers)
Posted on 2023-02-21 (4 Comments)
Solution computer solution by Charlie (2023-02-21 15:05:55)
Difficulty: 3 of 5Under 4 distinct pairs (in Just Math)
Posted on 2023-02-20 (5 Comments)
Some Thoughts my thoughts by Charlie (2023-02-20 09:07:08)
Difficulty: 3 of 5Under Fibonacci but with Subtraction still stays Positive (in Sequences)
Posted on 2023-02-15 (3 Comments)
Solution solution by Charlie (2023-02-15 17:13:49)
Difficulty: 3 of 5Under Broken TV Testament (in Science)
Posted on 2023-02-15 (2 Comments)
Solution solution by Charlie (2023-02-15 08:58:13)
Difficulty: 3 of 5Under Metapuzzle II (in Algorithms)
Posted on 2023-02-14 (1 Comments)
correction to link in puzzle by Charlie (2023-02-22 13:11:03)
Difficulty: 2 of 5Under Golfer Gauge II (in Liars and Knights)
Posted on 2023-02-13 (1 Comments)
Solution solution by Charlie (2023-02-13 08:38:01)
Difficulty: 3 of 5Under Arithmetic Sequence Crossed Integer Determination Puzzle (in Numbers)
Posted on 2023-02-12 (6 Comments)
the full grids by Charlie (2023-02-13 19:17:32)
re: computer solution by Charlie (2023-02-12 09:38:58)
Solution computer solution by Charlie (2023-02-12 09:16:29)
Difficulty: 3 of 5Under Respectively Divisible II (in Numbers)
Posted on 2023-02-10 (4 Comments)
Solution computer solution by Charlie (2023-02-10 10:05:51)
Difficulty: 3 of 5Under sod(N) = pod(sqrt(N)) (in Numbers)
Posted on 2023-02-09 (3 Comments)
re: thought on (c) by Charlie (2023-02-09 09:55:06)
Some Thoughts thought on (c) by Charlie (2023-02-09 09:34:45)
Some Thoughts computer solution of (a) and (b) -- spoilers by Charlie (2023-02-09 09:30:16)
Difficulty: 3 of 5Under Cube Rooted and Squared Til 2023 (in Just Math)
Posted on 2023-02-08 (2 Comments)
Solution computer evaluation (spoiler) by Charlie (2023-02-08 09:38:08)
Difficulty: 3 of 5Under Phi Proximity Poser (in Numbers)
Posted on 2023-02-07 (3 Comments)
computer exploration on part I by Charlie (2023-02-07 14:39:21)
Difficulty: 3 of 5Under Name the base (in Just Math)
Posted on 2023-02-07 (4 Comments)
the computer method by Charlie (2023-02-07 08:03:48)
Difficulty: 3 of 5Under Consider Prime Ratios, Get Integers (in Numbers)
Posted on 2023-02-04 (4 Comments)
Some Thoughts computer findings by Charlie (2023-02-04 09:54:58)
Difficulty: 3 of 5Under Fours and Fives Crossed Fortune Formulation (in Numbers)
Posted on 2023-02-03 (4 Comments)
Solution computer then interpretation by Charlie (2023-02-03 11:15:57)
Difficulty: 3 of 5Under Prisons foes (in Word Problems)
Posted on 2023-02-02 (7 Comments)
a start by Charlie (2023-02-02 09:17:00)
Difficulty: 3 of 5Under Partially filled cone (in Geometry)
Posted on 2023-02-01 (3 Comments)
Solution solution by Charlie (2023-02-01 09:32:56)
Difficulty: 3 of 5Under Archaic Anagram Ascertainment (in Word Problems)
Posted on 2023-01-31 (1 Comments)
Solution solution by Charlie (2023-01-31 10:38:12)
Difficulty: 1 of 5Under Long Distance Proposal Poser (in Science)
Posted on 2023-01-30 (1 Comments)
Solution Solution (spoiler) by Charlie (2023-01-30 09:26:55)
Difficulty: 3 of 5Under Semiprime times (in Numbers)
Posted on 2023-01-29 (1 Comments)
Solution computer solution by Charlie (2023-01-29 12:12:17)
Difficulty: 3 of 5Under Lynch-Bell numbers (in Numbers)
Posted on 2023-01-27 (3 Comments)
Solution Also answered, how many there are by Charlie (2023-01-27 10:35:09)
Difficulty: 3 of 5Under Integers with Happy, Healthy Babies (in Numbers)
Posted on 2023-01-26 (1 Comments)
Solution computer solution by Charlie (2023-01-26 10:32:05)
Difficulty: 3 of 5Under Ducks in a pond (in Probability)
Posted on 2023-01-24 (17 Comments)
3 ducks as a simulation by Charlie (2023-01-24 11:36:21)
Some Thoughts 4 ducks as a simulation by Charlie (2023-01-24 11:15:22)
numerical integration with 4 ducks by Charlie (2023-01-24 11:10:00)
re: my err -- no actually it was MY error by Charlie (2023-01-24 10:45:48)
Some Thoughts numerical integration for 3 ducks by Charlie (2023-01-24 09:58:55)
Difficulty: 2 of 5Under Log Value Extrication (in Just Math)
Posted on 2023-01-22 (2 Comments)
Solution solution by Charlie (2023-01-22 11:02:41)
Difficulty: 3 of 5Under Provisory Pairs (in Numbers)
Posted on 2023-01-21 (2 Comments)
Some Thoughts some numbers to look at by Charlie (2023-01-21 09:11:18)
Difficulty: 3 of 5Under Minimum Integer from Last 2 Digits Puzzle (in Numbers)
Posted on 2023-01-20 (2 Comments)
Solution computer solution by Charlie (2023-01-20 14:13:12)
Difficulty: 3 of 5Under Change the First Digit, Get Two Primes (in Numbers)
Posted on 2023-01-19 (2 Comments)
Solution computer solution by Charlie (2023-01-19 09:18:29)
Difficulty: 3 of 5Under Value Validation (in Just Math)
Posted on 2023-01-18 (2 Comments)
Some Thoughts Is this indirect enough? by Charlie (2023-01-18 09:54:46)
Difficulty: 2 of 5Under Fibonacci Lengths (in Numbers)
Posted on 2023-01-16 (2 Comments)
Some Thoughts The start of a proof by Charlie (2023-01-16 10:38:18)
Difficulty: 3 of 5Under Semiprimes and Emirps (in Numbers)
Posted on 2023-01-14 (5 Comments)
re: semi-analytic solution by Charlie (2023-01-14 11:05:15)
Solution computer solution by Charlie (2023-01-14 11:01:12)
Difficulty: 4 of 5Under Four Points in a Square (in Probability)
Posted on 2023-01-12 (10 Comments)
Code for sanity check by Charlie (2023-01-13 08:35:34)
re: Sanity check on classification -- last part got cut off by Charlie (2023-01-13 08:29:59)
Sanity check on classification by Charlie (2023-01-13 08:27:53)
re(2): preliminary simulation results by Charlie (2023-01-12 18:17:52)
re: preliminary simulation results by Charlie (2023-01-12 11:44:24)
Some Thoughts preliminary simulation results by Charlie (2023-01-12 09:49:53)
Difficulty: 3 of 5Under Countries of the World II (in Cryptography)
Posted on 2023-01-11 (2 Comments)
Solution computer solution by Charlie (2023-01-11 09:12:16)
Difficulty: 3 of 5Under Three digits (in Numbers)
Posted on 2023-01-10 (4 Comments)
Solution computer solution by Charlie (2023-01-10 09:05:17)
Difficulty: 2 of 5Under Alphametic Quickie (in Numbers)
Posted on 2023-01-09 (4 Comments)
re: Solution by Charlie (2023-01-09 10:43:29)
Solution solution by Charlie (2023-01-09 10:41:18)
Difficulty: 3 of 5Under Simultaneous Settlement VII (in Just Math)
Posted on 2023-01-08 (6 Comments)
Solution computer solution by Charlie (2023-01-08 08:56:36)
Difficulty: 3 of 5Under Pandigital Product Crossed Square Poser (in Numbers)
Posted on 2023-01-06 (18 Comments)
re(2): Solution by Charlie (2023-01-06 14:46:30)
re: Solution by Charlie (2023-01-06 14:11:39)
Difficulty: 3 of 5Under Narcissistic minus 1: Cerossistic (in Numbers)
Posted on 2023-01-05 (4 Comments)
Solution computer solution by Charlie (2023-01-05 10:14:00)
Difficulty: 3 of 5Under 1 2 3 4. How high is your score? (in Numbers)
Posted on 2023-01-03 (2 Comments)
Solution computer solution (spoiler) by Charlie (2023-01-03 21:15:24)
Difficulty: 1 of 5Under Ones and Zero Operation Outcome (in Tricks)
Posted on 2023-01-02 (3 Comments)
Some Thoughts my take on it by Charlie (2023-01-02 10:03:06)
Difficulty: 1 of 5Under A 1/1 problem (in Numbers)
Posted on 2023-01-01 (5 Comments)
re(3): hoping this is concise enough by Charlie (2023-01-03 08:57:40)
Some Thoughts hoping this is concise enough by Charlie (2023-01-01 09:06:28)
Difficulty: 3 of 5Under Bless you, Blaise! (in Probability)
Posted on 2022-12-31 (2 Comments)
Some Thoughts answers by Charlie (2022-12-31 08:56:11)
Difficulty: 4 of 5Under A quadruple gift for the N.Y. (in Numbers)
Posted on 2022-12-28 (8 Comments)
re(2): solutions by Charlie (2022-12-30 07:38:21)
Solution solutions by Charlie (2022-12-28 08:51:38)
Difficulty: 2 of 5Under Optimal Motorbike Travel Option (in General)
Posted on 2022-12-27 (7 Comments)
Solution researched solution by Charlie (2022-12-27 10:40:38)
Difficulty: 2 of 5Under Split Words Settlement IV (in Word Problems)
Posted on 2022-12-26 (4 Comments)
Solution solution by Charlie (2022-12-26 10:23:39)
Difficulty: 3 of 5Under Six Friends and a Wallet Puzzle (in Liars and Knights)
Posted on 2022-12-25 (3 Comments)
Solution solution by Charlie (2022-12-25 10:29:10)
Difficulty: 3 of 5Under I-O Ratio Resolution (in Word Problems)
Posted on 2022-12-24 (4 Comments)
from my word list by Charlie (2022-12-24 12:59:42)
Difficulty: 3 of 5Under Gaussian Rectangle Problem (in Just Math)
Posted on 2022-12-23 (4 Comments)
re: Part 1 and part of part 2 by Charlie (2022-12-23 11:05:11)
re: computer answers (spoilers) by Charlie (2022-12-23 10:38:44)
Some Thoughts computer answers (spoilers) by Charlie (2022-12-23 10:06:52)
Difficulty: 3 of 5Under Triangular and Heptagonal Hindrance (in Numbers)
Posted on 2022-12-22 (3 Comments)
Solution computer solution by Charlie (2022-12-22 10:28:40)
Difficulty: 3 of 5Under Ukraine war (in Word Problems)
Posted on 2022-12-21 (4 Comments)
a couple more by Charlie (2022-12-21 10:08:03)
Difficulty: 2 of 5Under Near Exponential Expressions Crossed Value Derivation (in Just Math)
Posted on 2022-12-20 (2 Comments)
Solution solution by Charlie (2022-12-20 08:25:01)
Difficulty: 3 of 5Under Permuted Duodecimal Mean Muse (in Numbers)
Posted on 2022-12-19 (5 Comments)
re: Solution by Charlie (2022-12-19 07:56:17)
Solution solution by Charlie (2022-12-19 07:41:38)
Difficulty: 3 of 5Under Year Yearn 4 (in Numbers)
Posted on 2022-12-18 (5 Comments)
re(2): computer findings by Charlie (2022-12-18 16:35:23)
Some Thoughts computer findings by Charlie (2022-12-18 10:28:52)
Difficulty: 4 of 5Under More Tangential Trapezoids (in Geometry)
Posted on 2022-12-16 (4 Comments)
Bonus by Charlie (2022-12-16 10:51:12)
re: computer solution (hope it's right--see caveats) by Charlie (2022-12-16 10:27:40)
Some Thoughts computer solution (hope it's right--see caveats) by Charlie (2022-12-16 10:17:50)
Difficulty: 3 of 5Under Specially Constituted Word (in Word Problems)
Posted on 2022-12-15 (10 Comments)
Solution computer solution by Charlie (2022-12-15 09:42:33)
Difficulty: 3 of 5Under Butcher and Baker Puzzle (in Logic)
Posted on 2022-12-14 (26 Comments)
re: soln by Charlie (2022-12-14 09:49:35)
Solution computer solution by Charlie (2022-12-14 09:45:54)
Difficulty: 3 of 5Under Ice Cream Sundae Surmise (in Logic)
Posted on 2022-12-11 (3 Comments)
Solution computer solution by Charlie (2022-12-11 11:19:00)
Difficulty: 3 of 5Under Atom-sized Black Hole Mass (in Science)
Posted on 2022-12-08 (3 Comments)
re: my calculations by Charlie (2022-12-08 11:08:35)
my calculations by Charlie (2022-12-08 10:00:35)
Difficulty: 2 of 5Under He Fooled Penn & Teller but ... (in Numbers)
Posted on 2022-12-07 (4 Comments)
re: Solution -- an aside by Charlie (2022-12-07 08:31:03)
Difficulty: 3 of 5Under Rising above the ceiling (in Probability)
Posted on 2022-12-06 (6 Comments)
Some Thoughts Some simulatons by Charlie (2022-12-06 09:56:10)
Difficulty: 2 of 5Under Telescopic Trial (in Science)
Posted on 2022-12-05 (5 Comments)
re: soln by Charlie (2022-12-05 11:53:33)
Some Thoughts Solution (spoiler) in overly-verbose detail. by Charlie (2022-12-05 08:16:40)
Difficulty: 3 of 5Under Fraction-Fraction-Fraction Finding (in Numbers)
Posted on 2022-12-02 (2 Comments)
Solution computer solution by Charlie (2022-12-02 10:10:13)
Difficulty: 3 of 5Under A Tangential Trapezoid (in Geometry)
Posted on 2022-11-30 (2 Comments)
Solution computer solution by Charlie (2022-11-30 09:39:15)
Difficulty: 1 of 5Under Two Plus Two Equals Five (in Tricks)
Posted on 2022-11-29 (4 Comments)
Some Thoughts One classic way by Charlie (2022-11-29 08:53:20)
Difficulty: 3 of 5Under 100 Lights and 100 Switches (in General)
Posted on 2022-11-28 (6 Comments)
Solution solution by Charlie (2022-11-28 09:09:35)
Difficulty: 2 of 5Under Prime or Composite? (in Numbers)
Posted on 2022-11-27 (3 Comments)
Solution solution by Charlie (2022-11-27 09:49:40)
Difficulty: 3 of 5Under A square 2 (in Numbers)
Posted on 2022-11-26 (8 Comments)
re(3): More than expected by Charlie (2022-11-26 20:32:38)
Solution computer solution by Charlie (2022-11-26 09:06:15)
Difficulty: 3 of 5Under Nonn, easy, nice. (in Just Math)
Posted on 2022-11-23 (5 Comments)
Some Thoughts computer exploration by Charlie (2022-11-23 11:20:15)
Difficulty: 3 of 5Under Covert Quantity VI (in Logic)
Posted on 2022-11-22 (5 Comments)
Solution computer solution (spoiler) by Charlie (2022-11-22 10:26:33)
Difficulty: 4 of 5Under Semiprimes in Arithmetic Sequence (in Sequences)
Posted on 2022-11-20 (11 Comments)
Some Thoughts a failed attempt by Charlie (2022-11-20 11:07:03)
Difficulty: 3 of 5Under Sawtooth Limit Settlement (in Calculus)
Posted on 2022-11-17 (5 Comments)
re(2): solution by Charlie (2022-11-17 10:37:36)
re: solution by Charlie (2022-11-17 10:04:25)
Solution solution by Charlie (2022-11-17 09:46:11)
Difficulty: 3 of 5Under Trading Places 2 (in General)
Posted on 2022-11-16 (7 Comments)
Solution computer solution (spoiler) by Charlie (2022-11-16 09:36:29)
Difficulty: 3 of 5Under Bits adjacent to 1 (in Sequences)
Posted on 2022-11-15 (5 Comments)
Solution computer solution by Charlie (2022-11-15 10:42:22)
Difficulty: 3 of 5Under A Game of Dice Puzzle (in Probability)
Posted on 2022-11-14 (7 Comments)
re: solution --- simulation by Charlie (2022-11-14 14:00:50)
Solution solution by Charlie (2022-11-14 10:40:18)
Difficulty: 3 of 5Under Four Crossed Female Athlete Ascertainment (in Logic)
Posted on 2022-11-11 (2 Comments)
Solution computer solution by Charlie (2022-11-11 10:26:34)
Difficulty: 3 of 5Under Missing Digit Deduction (in Numbers)
Posted on 2022-11-08 (2 Comments)
Solution solution by Charlie (2022-11-08 12:38:03)
Difficulty: 3 of 5Under Binomial Coefficient Product Puzzle (in Numbers)
Posted on 2022-11-07 (3 Comments)
Some Thoughts computer exploration (spoiler) by Charlie (2022-11-07 10:37:14)
Difficulty: 3 of 5Under Balanced Ternary Treat (in Algorithms)
Posted on 2022-11-04 (1 Comments)
Solution solution by Charlie (2022-11-04 11:31:44)
Difficulty: 3 of 5Under Couple of Words II (in Word Problems)
Posted on 2022-11-03 (8 Comments)
Some Thoughts computer findings by Charlie (2022-11-03 14:51:48)
Difficulty: 3 of 5Under A six-way division (in Weights and Scales)
Posted on 2022-11-01 (5 Comments)
re(3): soln -- a couple more thoughts by Charlie (2022-11-15 10:51:11)
re: soln by Charlie (2022-11-14 13:37:31)
Difficulty: 3 of 5Under Lights Out! (2) (in General)
Posted on 2022-10-31 (22 Comments)
re(2): Cleaned-up code for the extension and an observation by Charlie (2022-11-14 14:18:01)
Cleaned-up code for the extension and an observation by Charlie (2022-11-13 11:32:26)
Faster Method -- here's 17 and 19 by Charlie (2022-11-11 22:01:34)
re(4): extension of the problem -- 13 and 15 by Charlie (2022-11-11 14:02:56)
re(3): extension of the problem by Charlie (2022-11-11 12:41:43)
Solution computer solution by Charlie (2022-10-31 10:31:43)
Difficulty: 3 of 5Under Iterated Floor Illation (in Just Math)
Posted on 2022-10-28 (22 Comments)
Solution computer-assisted solution by Charlie (2022-10-28 11:52:28)
Difficulty: 3 of 5Under 123…9 door to door (in Sequences)
Posted on 2022-10-27 (27 Comments)
Solution computer verification by Charlie (2022-10-27 11:23:23)
Solution solution by Charlie (2022-10-27 09:07:23)
Difficulty: 3 of 5Under Sorting Coins III (in Weights and Scales)
Posted on 2022-10-26 (4 Comments)
No Subject by Charlie (2022-11-06 09:26:34)
Difficulty: 3 of 5Under Repeating tetradecimals (in Numbers)
Posted on 2022-10-25 (4 Comments)
Some Thoughts for bases 8 through 16 by Charlie (2022-10-25 13:59:50)
Solution computer solution by Charlie (2022-10-25 13:29:52)
Difficulty: 3 of 5Under Four Floored Cube Finding (in Numbers)
Posted on 2022-10-24 (2 Comments)
Solution answers by Charlie (2022-10-24 11:32:53)
Difficulty: 1 of 5Under Close Shave Conclusion (in Science)
Posted on 2022-10-23 (1 Comments)
Some Thoughts discussion by Charlie (2022-10-23 09:10:44)
Difficulty: 4 of 5Under Average Arctic Distance (in Probability)
Posted on 2022-10-21 (8 Comments)
re(2): soln by Charlie (2022-10-21 19:01:21)
Difficulty: 3 of 5Under Distance through a cube (in Shapes)
Posted on 2022-10-20 (3 Comments)
Solution computer solution by Charlie (2022-10-20 11:12:32)
Difficulty: 3 of 5Under A Misinformed Liar Cannot Falsify Facts (in Logic)
Posted on 2022-10-17 (2 Comments)
Some Thoughts hmmm by Charlie (2022-10-17 11:57:08)
Difficulty: 3 of 5Under Knot Tying Travail (in Probability)
Posted on 2022-10-16 (5 Comments)
Solution re: Solution? -- I agree it is by Charlie (2022-10-16 08:49:42)
Difficulty: 3 of 5Under Three Distinct Divisor Trial (in Numbers)
Posted on 2022-10-15 (5 Comments)
Solution computer solution by Charlie (2022-10-15 11:06:49)
Difficulty: 3 of 5Under Regular Hexagon and Mean Distance (in Shapes)
Posted on 2022-10-14 (6 Comments)
Some Thoughts Simulations by Charlie (2022-10-14 08:28:24)
Difficulty: 4 of 5Under Mystery sequence (in Sequences)
Posted on 2022-10-13 (8 Comments)
re(3): Solution? - confirmation by Charlie (2022-10-18 11:04:12)
Difficulty: 3 of 5Under Sliding Puzzle III (in General)
Posted on 2022-10-12 (3 Comments)
Solution computer solution based on previous Sliding Puzzle program by Charlie (2022-10-12 11:11:43)
Difficulty: 2 of 5Under Facile probability poser? (in Probability)
Posted on 2022-10-09 (4 Comments)
Some Thoughts simulation by Charlie (2022-10-09 10:00:02)
Difficulty: 4 of 5Under Bugs and Cubs II (in Cryptography)
Posted on 2022-10-07 (5 Comments)
Some Thoughts my computer findings after seeing Steven Lord's comment by Charlie (2022-10-07 10:56:29)
Difficulty: 3 of 5Under Air Plane Episode Ascertainment (in Science)
Posted on 2022-10-06 (3 Comments)
Some Thoughts presumably the answer by Charlie (2022-10-06 09:00:22)
Difficulty: 3 of 5Under Consider, Unit Area, Get Side Length (in Shapes)
Posted on 2022-10-05 (3 Comments)
Solution computer-aided solution by Charlie (2022-10-05 09:15:23)
Difficulty: 1 of 5Under Marriage Muse III (in Logic)
Posted on 2022-10-03 (6 Comments)
re: soln by Charlie (2022-10-03 10:24:39)
Difficulty: 3 of 5Under The box (2) (in Numbers)
Posted on 2022-10-02 (5 Comments)
Solution computer solution by Charlie (2022-10-02 12:48:42)
Difficulty: 3 of 5Under Temperature Temperament V (in Numbers)
Posted on 2022-10-01 (2 Comments)
Solution computer findings by Charlie (2022-10-01 12:35:19)
Difficulty: 3 of 5Under Fifth Root Finding (in Algorithms)
Posted on 2022-09-29 (1 Comments)
Some Thoughts a suboptimal algorithm by Charlie (2022-09-29 08:35:46)
Difficulty: 3 of 5Under Sliding Puzzle II (in General)
Posted on 2022-09-28 (6 Comments)
Solution computer solution (spoiler) by Charlie (2022-09-28 11:23:35)
Difficulty: 3 of 5Under Square Overlap Settlement (in Probability)
Posted on 2022-09-24 (1 Comments)
Solution solution by Charlie (2022-09-24 11:53:27)
Difficulty: 3 of 5Under NegaDuodecimal Nuance (in Algorithms)
Posted on 2022-09-23 (1 Comments)
Solution computer solution by Charlie (2022-09-23 11:21:18)
Difficulty: 3 of 5Under Ring sets (in Geometry)
Posted on 2022-09-22 (1 Comments)
Solution computer solution by Charlie (2022-09-22 11:55:17)
Difficulty: 3 of 5Under Arithmetic Sequence Crossed Integer Triplet Puzzle (in Numbers)
Posted on 2022-09-21 (6 Comments)
another take; same answer by Charlie (2022-09-21 09:29:29)
Difficulty: 3 of 5Under One, Two, Three, Floor Integral 2 (in Calculus)
Posted on 2022-09-20 (1 Comments)
Solution computer solution; computer varification by Charlie (2022-09-20 10:54:05)
Difficulty: 3 of 5Under Split Words Settlement III (in Word Problems)
Posted on 2022-09-19 (1 Comments)
Solution computer-aided solution (spoilers) by Charlie (2022-09-19 11:58:31)
Difficulty: 3 of 5Under Sums of floors and fractionals (in Just Math)
Posted on 2022-09-18 (6 Comments)
Solution computer solution by Charlie (2022-09-18 08:57:01)
Difficulty: 3 of 5Under Vowel Ratio Resolution (in Word Problems)
Posted on 2022-09-17 (3 Comments)
Some Thoughts computer findings by Charlie (2022-09-17 12:45:06)
Difficulty: 3 of 5Under Harmonic Harmony 3 (in Numbers)
Posted on 2022-09-15 (3 Comments)
computer solution by Charlie (2022-09-15 15:06:26)
Difficulty: 3 of 5Under A Pandigital Multiple Puzzle (in Numbers)
Posted on 2022-09-14 (1 Comments)
Solution a computer solution by Charlie (2022-09-14 11:18:02)
Difficulty: 3 of 5Under Colored Board Baffle (in Logic)
Posted on 2022-09-13 (7 Comments)
Solution computer solution by Charlie (2022-09-13 09:31:32)
Difficulty: 3 of 5Under Personality, Game, and Term Puzzle (in Word Problems)
Posted on 2022-09-11 (6 Comments)
Solution re: possible solution? by Charlie (2022-09-11 11:02:46)
Difficulty: 3 of 5Under Prosecutor Fallacy Poser (in General)
Posted on 2022-09-10 (5 Comments)
Solution solution by Charlie (2022-09-10 11:48:41)
Difficulty: 4 of 5Under Scrabble numbers that score themselves (in Word Problems)
Posted on 2022-09-09 (1 Comments)
Solution computer solution (spoiler) by Charlie (2022-09-09 11:42:36)
Difficulty: 3 of 5Under Two Cask Mixture Muse (in Weights and Scales)
Posted on 2022-09-08 (2 Comments)
Solution computer solution by Charlie (2022-09-08 08:26:42)
Difficulty: 3 of 5Under Double Pressure Predicament (in Science)
Posted on 2022-09-05 (6 Comments)
inexact solution by Charlie (2022-09-05 09:57:18)
Difficulty: 3 of 5Under Tautonymic number counting (in Algorithms)
Posted on 2022-09-04 (2 Comments)
Solution solution (parts 2 and 3) by Charlie (2022-09-04 10:04:04)
Difficulty: 3 of 5Under Many types (in Liars and Knights)
Posted on 2022-09-03 (1 Comments)
Solution solution by Charlie (2022-09-03 08:28:47)
Difficulty: 3 of 5Under Movie Synonym Muse (in Word Problems)
Posted on 2022-08-31 (5 Comments)
synonyms by Charlie (2022-08-31 11:39:04)
Difficulty: 3 of 5Under Binary Crossnumber Puzzle - 02 (in General)
Posted on 2022-08-30 (4 Comments)
Solution No Subject by Charlie (2022-08-30 10:18:57)
Difficulty: 3 of 5Under Red Flower Survival Surmise (in Probability)
Posted on 2022-08-29 (2 Comments)
Solution solution by Charlie (2022-08-29 10:45:51)
Difficulty: 3 of 5Under Guard Schedule Surmise (in Logic)
Posted on 2022-08-28 (2 Comments)
Solution computer solution by Charlie (2022-08-28 10:44:44)
Difficulty: 3 of 5Under Forty-one's Forte (in Numbers)
Posted on 2022-08-27 (5 Comments)
Solution computer solution (spoiler) by Charlie (2022-08-27 09:22:34)
Difficulty: 3 of 5Under Powering up the digits V (in Numbers)
Posted on 2022-08-26 (2 Comments)
Solution computer-aided solution by Charlie (2022-08-26 09:09:28)
Difficulty: 2 of 5Under Cool It Again, Brother (in Science)
Posted on 2022-08-22 (2 Comments)
Solution Solution (spoiler) by Charlie (2022-08-22 08:00:50)
Difficulty: 3 of 5Under Product Crossed Square Settlement (in Probability)
Posted on 2022-08-19 (5 Comments)
Solution computer solution by Charlie (2022-08-19 10:55:53)
Difficulty: 3 of 5Under Ratio Resolution VII (in Weights and Scales)
Posted on 2022-08-16 (3 Comments)
Some Thoughts computer findings by Charlie (2022-08-16 09:17:38)
Difficulty: 3 of 5Under Smallest Prime Settlement (in Numbers)
Posted on 2022-08-14 (3 Comments)
Solution computer solution by Charlie (2022-08-14 10:50:14)
Difficulty: 3 of 5Under Cubic Diophantine Conclusion II (in Numbers)
Posted on 2022-08-13 (2 Comments)
Solution computer solution by Charlie (2022-08-13 11:41:12)
Difficulty: 4 of 5Under 7 somewhere (in Numbers)
Posted on 2022-08-12 (16 Comments)
re(4): solution by Charlie (2022-08-15 16:57:51)
re(2): solution by Charlie (2022-08-14 20:15:43)
re: solution by Charlie (2022-08-12 19:43:16)
Solution solution by Charlie (2022-08-12 15:03:15)
Difficulty: 2 of 5Under Ice Cube Mystery (in Science)
Posted on 2022-08-09 (2 Comments)
re: Lots of alcohol by Charlie (2022-08-09 11:57:21)
Difficulty: 2 of 5Under Perplexus arrangement (in Just Math)
Posted on 2022-08-08 (1 Comments)
Solution three ways (spoiler) by Charlie (2022-08-08 08:48:10)
Difficulty: 3 of 5Under Singular Squares II (in Numbers)
Posted on 2022-08-06 (3 Comments)
Solution computer solution by Charlie (2022-08-06 09:55:01)
Difficulty: 3 of 5Under Missing Duodecimal Digit Determination (in Numbers)
Posted on 2022-08-04 (6 Comments)
Solution solution by Charlie (2022-08-04 09:31:39)
Difficulty: 3 of 5Under Digital Root Unity (in Numbers)
Posted on 2022-08-03 (3 Comments)
Solution solution by Charlie (2022-08-03 08:06:09)
Difficulty: 3 of 5Under 888...888 (in Numbers)
Posted on 2022-08-02 (10 Comments)
Solution computer-aided solution by Charlie (2022-08-02 09:23:26)
Difficulty: 2 of 5Under Super Exponentiation Surmise (in Just Math)
Posted on 2022-07-31 (13 Comments)
Solution trial and error annotated by Charlie (2022-07-31 09:26:33)
Difficulty: 3 of 5Under Physicist Anagram Ascertainment (in Word Problems)
Posted on 2022-07-30 (6 Comments)
re: H I n t s by Charlie (2022-07-31 06:32:33)
Some Thoughts A few more by Charlie (2022-07-30 09:30:07)
Some Thoughts A Start by Charlie (2022-07-30 07:14:42)
Difficulty: 3 of 5Under Half Integer Base Baffle (in Algorithms)
Posted on 2022-07-29 (2 Comments)
Some Thoughts The "standard" method? by Charlie (2022-07-29 11:17:19)
Some Thoughts starting computer solution by Charlie (2022-07-29 10:21:02)
Difficulty: 3 of 5Under From sum to addends 2 (in Numbers)
Posted on 2022-07-28 (3 Comments)
computer solution by Charlie (2022-07-28 11:40:05)
Difficulty: 3 of 5Under Product Crossed Pointed Ratio Puzzle (in Numbers)
Posted on 2022-07-27 (7 Comments)
re(2): computer solution - 3 other solutions by Charlie (2022-07-28 16:34:23)
re: computer solution formatting improved by Charlie (2022-07-27 18:16:35)
Solution computer solution by Charlie (2022-07-27 11:51:44)
Difficulty: 2 of 5Under Bronze Ball Contest Conclusion (in Science)
Posted on 2022-07-25 (4 Comments)
re: One way to do it (spoiler) by Charlie (2022-07-25 11:33:11)
Difficulty: 4 of 5Under 381654729 (in Just Math)
Posted on 2022-07-23 (6 Comments)
re(3): Hint? @ Charlie by Charlie (2022-07-30 15:10:33)
re: Hint? by Charlie (2022-07-25 15:50:41)
Difficulty: 2 of 5Under Perfect Powers with no Repeat Digits (in Numbers)
Posted on 2022-07-22 (1 Comments)
Solution computer solution by Charlie (2022-07-22 12:56:28)
Difficulty: 2 of 5Under A square deal (in Sequences)
Posted on 2022-07-18 (4 Comments)
Solution computer solution by Charlie (2022-07-18 08:33:49)
Difficulty: 3 of 5Under TV Show Travail (in Logic)
Posted on 2022-07-16 (3 Comments)
Solution computer solution by Charlie (2022-07-16 10:28:02)
Difficulty: 3 of 5Under Spellements 2 (in General)
Posted on 2022-07-15 (12 Comments)
Solution Another try by Charlie (2022-07-17 17:14:23)
Question re(5): Not the scoring method I had in mind, but ... by Charlie (2022-07-17 09:59:14)
Question re(3): Not the scoring method I had in mind, but ... by Charlie (2022-07-17 06:40:14)
Question re: Not the scoring method I had in mind, but ... by Charlie (2022-07-16 17:32:33)
the start of the remainder of the list by Charlie (2022-07-15 11:23:25)
Solution The start of the list by Charlie (2022-07-15 11:21:28)
computer method by Charlie (2022-07-15 11:17:34)
Difficulty: 3 of 5Under Getting Better on the Elo Ratings (in Logic)
Posted on 2022-07-14 (8 Comments)
re: One way (solution) by Charlie (2022-07-14 09:41:58)
Solution computer solution by Charlie (2022-07-14 09:28:00)
Difficulty: 3 of 5Under The Game of Keno (in Probability)
Posted on 2022-07-12 (3 Comments)
re: Solution by Charlie (2022-07-12 10:58:04)
Difficulty: 3 of 5Under Three clocks (in Just Math)
Posted on 2022-07-10 (6 Comments)
Solution solution by Charlie (2022-07-10 09:53:53)
Difficulty: 3 of 5Under Spellements (in General)
Posted on 2022-07-09 (1 Comments)
Solution computer solution by Charlie (2022-07-09 12:08:29)
Difficulty: 3 of 5Under SOD(power) = power (in Numbers)
Posted on 2022-07-07 (1 Comments)
Solution computer solution by Charlie (2022-07-07 11:23:51)
Difficulty: 4 of 5Under Euler was wrong (in Just Math)
Posted on 2022-07-06 (3 Comments)
Solution computer solution by Charlie (2022-07-06 12:04:20)
Difficulty: 3 of 5Under Mrs. Arithmetic and Mrs. Algebra (in Numbers)
Posted on 2022-07-05 (4 Comments)
Solution computer-aided solution by Charlie (2022-07-05 13:11:05)
Difficulty: 3 of 5Under Pro and con (in Word Problems)
Posted on 2022-07-03 (9 Comments)
Solution computer solution (spoiler) by Charlie (2022-07-03 09:22:13)
Difficulty: 3 of 5Under A Pair of Factorial Quartic Equations (in Numbers)
Posted on 2022-07-02 (4 Comments)
Solution very computerized solution by Charlie (2022-07-02 10:32:34)
Difficulty: 4 of 5Under West of Evan, East of Odin (in Numbers)
Posted on 2022-06-29 (1 Comments)
Solution computer solution by Charlie (2022-06-29 12:20:36)
Difficulty: 3 of 5Under Three Card Trial (in Logic)
Posted on 2022-06-26 (4 Comments)
Some Thoughts hmmm... by Charlie (2022-06-26 09:29:59)
Difficulty: 2 of 5Under Apples, Bananas, and Oranges Puzzle (in Liars and Knights)
Posted on 2022-06-25 (3 Comments)
Solution solution by Charlie (2022-06-25 12:22:32)
Difficulty: 4 of 5Under Egyptian Fraction Expression (in Numbers)
Posted on 2022-06-24 (3 Comments)
Solution computer solution by Charlie (2022-06-24 12:36:49)
Difficulty: 3 of 5Under Matchstick Movement Muse (in General)
Posted on 2022-06-21 (3 Comments)
Solution computer solution by Charlie (2022-06-21 11:33:02)
Difficulty: 2 of 5Under Why Eat? (in Word Problems)
Posted on 2022-06-20 (2 Comments)
re: Why Eat? by Charlie (2022-06-20 08:31:41)
Solution Why Eat? by Charlie (2022-06-20 08:05:05)
Difficulty: 3 of 5Under Pizza Topping Treat (in Logic)
Posted on 2022-06-19 (4 Comments)
Solution computer solution by Charlie (2022-06-19 09:44:19)
Difficulty: 3 of 5Under X and Lucky Seven Settlement (in Numbers)
Posted on 2022-06-18 (3 Comments)
Solution mostly computer solution by Charlie (2022-06-18 09:36:30)
Difficulty: 3 of 5Under Hexagon area ratio (in Geometry)
Posted on 2022-06-15 (1 Comments)
Solution computer-aided solution (spoiler) by Charlie (2022-06-15 10:09:35)
Difficulty: 3 of 5Under Primorial Penultimate Piece (in Numbers)
Posted on 2022-06-14 (2 Comments)
Solution computer solution by Charlie (2022-06-14 11:19:53)
Difficulty: 2 of 5Under Decimal Specification (in Numbers)
Posted on 2022-06-13 (3 Comments)
Solution computer solution by Charlie (2022-06-13 09:02:41)
Difficulty: 2 of 5Under Card Identification Illation (in Logic)
Posted on 2022-06-12 (4 Comments)
Solution solution by Charlie (2022-06-12 10:09:47)
Difficulty: 4 of 5Under Arithmetic Derivative (in Numbers)
Posted on 2022-06-10 (7 Comments)
re: bits and pieces by Charlie (2022-06-10 15:50:51)
Python version for 1 & 2 by Charlie (2022-06-10 14:47:36)
re(2): part (3) expanded to 5-digit n (continued) by Charlie (2022-06-10 11:10:09)
re: part (3) expanded to 5-digit n (continued) by Charlie (2022-06-10 11:09:09)
part (3) expanded to 5-digit n by Charlie (2022-06-10 11:07:23)
Solution computer solution by Charlie (2022-06-10 11:02:48)
Difficulty: 4 of 5Under Sorta Platonic... (in Numbers)
Posted on 2022-06-09 (3 Comments)
testing only to the limit of double precision floating point by Charlie (2022-06-09 10:08:23)
Difficulty: 4 of 5Under Maximum Palindrome Count Muse (in Numbers)
Posted on 2022-06-07 (3 Comments)
Solution computer solution by Charlie (2022-06-07 10:23:45)
Difficulty: 3 of 5Under Quaint Quadruplet Query (in Numbers)
Posted on 2022-06-06 (5 Comments)
Some Thoughts computer exploration -- no proof of completeness by Charlie (2022-06-06 08:08:37)
Difficulty: 3 of 5Under '- subject to availability -' (in Probability)
Posted on 2022-06-02 (7 Comments)
re: We need a third simulation by Charlie (2022-06-02 14:07:55)
Solution solution by simulation by Charlie (2022-06-02 11:32:17)
Difficulty: 3 of 5Under Last house on the street (in Just Math)
Posted on 2022-05-31 (7 Comments)
if thee were only odd numbers on his side by Charlie (2022-05-31 16:26:01)
On the assumption all houses were on his side by Charlie (2022-05-31 12:28:39)
Solution my solution by Charlie (2022-05-31 11:58:59)
Difficulty: 3 of 5Under Forty Four Digit Decision (in Numbers)
Posted on 2022-05-30 (2 Comments)
Solution solution by Charlie (2022-05-30 11:37:17)
Difficulty: 3 of 5Under Lexicographic Listing (in Algorithms)
Posted on 2022-05-29 (3 Comments)
added list by Charlie (2022-05-29 17:47:09)
Solution solution by Charlie (2022-05-29 13:34:23)
Difficulty: 3 of 5Under An Integer Product (in Numbers)
Posted on 2022-05-26 (7 Comments)
re(3): demonstration by Charlie (2022-05-27 06:49:06)
re(2): demonstration by Charlie (2022-05-26 17:28:51)
Solution verification as integers by Charlie (2022-05-26 10:43:32)
Difficulty: 3 of 5Under Consecutive Conclusion II (in Sequences)
Posted on 2022-05-25 (3 Comments)
Solution computer solution by Charlie (2022-05-25 11:41:48)
Difficulty: 2 of 5Under Queen and Bishop Query (in Games)
Posted on 2022-05-24 (2 Comments)
The full program in one piece, and a variation. by Charlie (2022-05-25 06:58:54)
Solution computer solution by Charlie (2022-05-24 12:39:05)
Difficulty: 3 of 5Under Tricky Vowel Arrangement (in Shapes)
Posted on 2022-05-23 (2 Comments)
Solution solution -- exploded view by Charlie (2022-05-23 08:44:13)
Difficulty: 3 of 5Under Card Shuffle Conclusion (in Probability)
Posted on 2022-05-20 (1 Comments)
Solution computer-aided solution by Charlie (2022-05-20 14:01:31)
Difficulty: 3 of 5Under Only integer answers (in Just Math)
Posted on 2022-05-19 (8 Comments)
Some Thoughts Matlab version by Charlie (2022-05-19 10:21:07)
Difficulty: 3 of 5Under Fifth Thursdays and Sundays (in Algorithms)
Posted on 2022-05-17 (1 Comments)
Solution solution as I think intended by Charlie (2022-05-17 12:27:15)
Difficulty: 3 of 5Under Checkerboard Chance Conclusion II (in Probability)
Posted on 2022-05-16 (2 Comments)
Solution solution by Charlie (2022-05-16 10:42:35)
Difficulty: 4 of 5Under Roman Square Root Resolution (in Algorithms)
Posted on 2022-05-15 (6 Comments)
Implementation of the idea by Charlie (2022-05-15 10:59:12)
Difficulty: 4 of 5Under A very sparse Sudoku (in Numbers)
Posted on 2022-05-14 (4 Comments)
Solution computer-aided solution (spoiler) by Charlie (2022-05-14 11:19:59)
Difficulty: 3 of 5Under 2^n mod n (in Just Math)
Posted on 2022-05-13 (3 Comments)
re: Parts 1, 2, and 4 (and probably 3) by Charlie (2022-05-13 11:46:37)
Difficulty: 3 of 5Under Googol vs Googolplex (in Numbers)
Posted on 2022-05-12 (3 Comments)
Solution computer solution by Charlie (2022-05-12 10:46:20)
Difficulty: 3 of 5Under Completing factorial (in Numbers)
Posted on 2022-05-11 (1 Comments)
Solution solution by Charlie (2022-05-11 11:40:02)
Difficulty: 3 of 5Under Even percents (in Numbers)
Posted on 2022-05-10 (3 Comments)
Some Thoughts not necessarily minimal by Charlie (2022-05-10 12:50:43)
Difficulty: 3 of 5Under 2 incompatible words (in Word Problems)
Posted on 2022-05-09 (3 Comments)
Solution with computer assistance (spoiler) by Charlie (2022-05-09 08:33:26)
Difficulty: 3 of 5Under Car Thief Identification (in Logic)
Posted on 2022-05-08 (5 Comments)
Some Thoughts some thoughts by Charlie (2022-05-08 12:31:08)
Difficulty: 3 of 5Under Colored Marble Muse (in Probability)
Posted on 2022-05-07 (4 Comments)
re: Solution by cases by Charlie (2022-05-07 23:03:13)
Solution computer-aided solution by Charlie (2022-05-07 13:24:06)
Difficulty: 3 of 5Under Capital Crossed Creature Conclusion (in Word Problems)
Posted on 2022-05-06 (1 Comments)
Solution With some computer assistance (spoiler) by Charlie (2022-05-06 10:00:25)
Difficulty: 3 of 5Under Seven Shirt Settlement (in Logic)
Posted on 2022-05-05 (3 Comments)
Solution computer solution by Charlie (2022-05-05 12:17:10)
Difficulty: 3 of 5Under 50 - Digit Number III (in Numbers)
Posted on 2022-05-04 (7 Comments)
Solution computer solution by Charlie (2022-05-04 12:50:44)
Difficulty: 3 of 5Under Mixed Fraction Product Poser (in Just Math)
Posted on 2022-05-03 (10 Comments)
Solution computer solution by Charlie (2022-05-03 08:24:10)
Difficulty: 3 of 5Under Two Family Travail (in Liars and Knights)
Posted on 2022-05-01 (2 Comments)
Solution computer solution by Charlie (2022-05-01 10:22:57)
Difficulty: 2 of 5Under Ten Box Trial (in Weights and Scales)
Posted on 2022-04-29 (10 Comments)
Solution computer solution by Charlie (2022-04-29 09:36:14)
possible intent by Charlie (2022-04-29 08:12:53)
Difficulty: 3 of 5Under The Playlist (in Probability)
Posted on 2022-04-28 (2 Comments)
Solution solutions by Charlie (2022-04-28 09:08:10)
Difficulty: 3 of 5Under Counting words (in Just Math)
Posted on 2022-04-27 (7 Comments)
re: How to get to a closed form? by Charlie (2022-04-27 13:39:00)
re: solution -- correction by Charlie (2022-04-27 08:50:11)
Solution solution by Charlie (2022-04-27 08:36:49)
Difficulty: 3 of 5Under Find all Numbers II (in Numbers)
Posted on 2022-04-24 (4 Comments)
Solution computer solution by Charlie (2022-04-24 09:42:46)
Difficulty: 3 of 5Under Animal Portraits Ascertainment (in Logic)
Posted on 2022-04-21 (3 Comments)
Solution the computer method by Charlie (2022-04-21 08:55:19)
Difficulty: 3 of 5Under 3 Pals make a Pal (in Numbers)
Posted on 2022-04-20 (2 Comments)
parts a and b by Charlie (2022-04-20 12:50:54)
Difficulty: 3 of 5Under Move the digit, Change the base (in Numbers)
Posted on 2022-04-19 (10 Comments)
Summary -- if it had been right from the start by Charlie (2022-04-21 09:17:31)
re(6): computer exploration -- c and d finally by Charlie (2022-04-20 14:46:17)
re(5): computer exploration -- all right, got b by Charlie (2022-04-19 19:03:46)
re(4): computer exploration -- c and d finally by Charlie (2022-04-19 18:57:59)
re(2): computer exploration by Charlie (2022-04-19 13:46:52)
Some Thoughts computer exploration by Charlie (2022-04-19 11:16:24)
Difficulty: 2 of 5Under L OR H (in Weights and Scales)
Posted on 2022-04-18 (4 Comments)
Solution solution by Charlie (2022-04-18 11:43:54)
Difficulty: 3 of 5Under From a to z (in Just Math)
Posted on 2022-04-17 (7 Comments)
solution by Charlie (2022-04-17 08:24:58)
Difficulty: 3 of 5Under Mixture Mix Muse (in Science)
Posted on 2022-04-16 (8 Comments)
re: Solution by Charlie (2022-04-16 19:19:05)
Difficulty: 3 of 5Under Divisible by 13 (in Algorithms)
Posted on 2022-04-15 (11 Comments)
Test for 20,220-digit numbers by Charlie (2022-04-15 14:48:27)
re: No Subject by Charlie (2022-04-15 14:02:01)
re: No Subject by Charlie (2022-04-15 11:23:57)
re: My favorite by Charlie (2022-04-15 11:18:26)
Difficulty: 3 of 5Under Summing up II (in Sequences)
Posted on 2022-04-14 (2 Comments)
Solution probable solution by Charlie (2022-04-14 09:59:56)
Difficulty: 3 of 5Under 225 as a factor (in Numbers)
Posted on 2022-04-12 (7 Comments)
re(3): Analytic solution by Charlie (2022-04-30 07:29:52)
re: Analytic solution by Charlie (2022-04-12 12:37:05)
Difficulty: 3 of 5Under Digit Replacement and Square Settlement (in Numbers)
Posted on 2022-04-11 (5 Comments)
Solution going farther by Charlie (2022-04-11 08:17:18)
Difficulty: 3 of 5Under Eventual Inverse Function (in Just Math)
Posted on 2022-04-08 (1 Comments)
Solution a set of solutions by Charlie (2022-04-10 06:21:47)
Difficulty: 3 of 5Under All the nines (in Numbers)
Posted on 2022-04-07 (9 Comments)
Some Thoughts re(4): possible computer solution(s) by Charlie (2022-04-09 12:30:58)
re(3): possible computer solution(s) by Charlie (2022-04-09 12:05:36)
re: possible computer solution(s) by Charlie (2022-04-07 10:16:27)
Some Thoughts possible computer solution(s) by Charlie (2022-04-07 09:48:48)
Difficulty: 3 of 5Under Darn you Wordle! (in Word Problems)
Posted on 2022-04-05 (6 Comments)
First a hunch, then computer search by Charlie (2022-04-05 09:54:30)
Difficulty: 3 of 5Under A Kiss solution (in General)
Posted on 2022-04-04 (9 Comments)
re: Solution by Charlie (2022-04-04 07:13:59)
Difficulty: 3 of 5Under Letter Ratios II (in Word Problems)
Posted on 2022-04-03 (2 Comments)
Solution the computer says by Charlie (2022-04-03 10:20:47)
Difficulty: 1 of 5Under Did Bobby err? (in Numbers)
Posted on 2022-04-02 (5 Comments)
Solution another route to the solution by Charlie (2022-04-02 14:15:44)
Difficulty: 3 of 5Under Singer Surmise (in General)
Posted on 2022-03-31 (14 Comments)
computer exploration by Charlie (2022-03-31 11:32:22)
Difficulty: 3 of 5Under Flipflop the digits, octuple the number (in Numbers)
Posted on 2022-03-30 (5 Comments)
Solution re(2): computer solution by Charlie (2022-03-30 20:53:05)
Solution computer solution by Charlie (2022-03-30 11:45:13)
Difficulty: 2 of 5Under Slim chance? (in Probability)
Posted on 2022-03-28 (5 Comments)
Solution presented graphically by Charlie (2022-03-28 11:32:12)
Difficulty: 2 of 5Under Word Wangle (in Word Problems)
Posted on 2022-03-27 (1 Comments)
Solution computer solutions (spoiler) by Charlie (2022-03-27 10:03:06)
Difficulty: 3 of 5Under Some inflation ! (in Numbers)
Posted on 2022-03-24 (4 Comments)
Solution computer solution (spoiler) by Charlie (2022-03-24 10:20:47)
Difficulty: 3 of 5Under A multiple of 42 (in Just Math)
Posted on 2022-03-23 (6 Comments)
Solution solution by Charlie (2022-03-23 08:57:13)
Difficulty: 2 of 5Under sum, reciprocals, squares (in Numbers)
Posted on 2022-03-22 (4 Comments)
Some Thoughts Findings by Charlie (2022-03-22 08:58:45)
Difficulty: 2 of 5Under Ketchup Sachet Settlement (in Science)
Posted on 2022-03-21 (6 Comments)
ketchup by Charlie (2022-03-21 10:40:47)
Difficulty: 3 of 5Under Intriguing Word Interior Illation (in Word Problems)
Posted on 2022-03-20 (4 Comments)
Solution computer solution by Charlie (2022-03-20 09:55:39)
Difficulty: 3 of 5Under Rational Reverse Crossed Product Resolution (in Numbers)
Posted on 2022-03-18 (5 Comments)
Solution computer solutions by Charlie (2022-03-18 10:56:12)
Difficulty: 3 of 5Under Relationship and Sex Settlement (in Logic)
Posted on 2022-03-16 (1 Comments)
Solution solution by Charlie (2022-03-16 19:15:16)
Difficulty: 3 of 5Under Palindrome factors (in Numbers)
Posted on 2022-03-15 (8 Comments)
re: My thoughts on the difficulty of part (B) by Charlie (2022-03-15 21:20:42)
Some Thoughts part (A) solution and an attempt at (B) by Charlie (2022-03-15 09:22:53)
Difficulty: 3 of 5Under Mathematical Anagram Muse (in Word Problems)
Posted on 2022-03-13 (2 Comments)
re: 80% -- other two (computer aided) by Charlie (2022-03-13 11:25:13)
Some Thoughts 80% by Charlie (2022-03-13 11:09:23)
Difficulty: 3 of 5Under Pentagonal and Hexagonal Poser (in Numbers)
Posted on 2022-03-10 (4 Comments)
Solution computer solution by Charlie (2022-03-10 09:22:40)
Difficulty: 3 of 5Under Inverse Root Difference Crossed Zeros Puzzle (in Just Math)
Posted on 2022-03-09 (4 Comments)
Solution solution (spoiler) by Charlie (2022-03-09 13:08:19)
Difficulty: 2 of 5Under Villes Et Etats Des Etats-Unis (in General)
Posted on 2022-03-05 (8 Comments)
re: soln by Charlie (2022-03-05 13:04:43)
Difficulty: 3 of 5Under Ratio Resolution VI (in Just Math)
Posted on 2022-03-04 (2 Comments)
Solution ... or let the computer do the arithmetic by Charlie (2022-03-04 12:55:59)
Difficulty: 3 of 5Under Year by Year 2 (in Numbers)
Posted on 2022-03-02 (1 Comments)
Solution solution (spoiler) by Charlie (2022-03-02 13:54:28)
Difficulty: 3 of 5Under No consecutive 1's (in Numbers)
Posted on 2022-02-27 (2 Comments)
Some Thoughts answer--no proof by Charlie (2022-02-27 10:42:06)
Difficulty: 3 of 5Under Split Words Settlement (in Word Problems)
Posted on 2022-02-26 (2 Comments)
Solution solutions by Charlie (2022-02-26 13:04:58)
Difficulty: 3 of 5Under Very peculiar feature ! (in Numbers)
Posted on 2022-02-24 (1 Comments)
Solution computer solution (spoiler) by Charlie (2022-02-24 09:02:13)
Difficulty: 3 of 5Under Announced vs Final rank average (in Probability)
Posted on 2022-02-23 (2 Comments)
Solution solution by Charlie (2022-02-23 10:14:42)
Difficulty: 3 of 5Under SOD Crossed 2023 Puzzle (in Just Math)
Posted on 2022-02-22 (2 Comments)
Solution Direct calculation; a pattern; and persistence limit by Charlie (2022-02-22 14:11:08)
Difficulty: 3 of 5Under Announced rank average (in Probability)
Posted on 2022-02-16 (3 Comments)
re(2): solution by Charlie (2022-02-16 23:18:27)
Solution solution by Charlie (2022-02-16 11:20:12)
Difficulty: 2 of 5Under Wordle Word Randomization (in Probability)
Posted on 2022-02-14 (3 Comments)
Hints/Tips Hint by Charlie (2022-02-15 07:50:14)
Difficulty: 3 of 5Under Continued Floor Elucidation (in Just Math)
Posted on 2022-02-13 (2 Comments)
Solution solution by Charlie (2022-02-13 10:15:18)
Difficulty: 3 of 5Under 2 parallel chords (in Geometry)
Posted on 2022-02-10 (3 Comments)
Solution computer-aided solution by Charlie (2022-02-10 09:38:22)
Difficulty: 3 of 5Under Five sentences (in Logic)
Posted on 2022-02-09 (3 Comments)
Solution the computer method by Charlie (2022-02-09 09:52:29)
Difficulty: 3 of 5Under Visit Validation (in Logic)
Posted on 2022-02-08 (1 Comments)
Solution solution by Charlie (2022-02-08 09:09:44)
Difficulty: 3 of 5Under Sum Cubes and Fourth Powers (in Just Math)
Posted on 2022-02-02 (4 Comments)
re: Solution by Charlie (2022-02-02 11:30:12)
Solution computer solution by Charlie (2022-02-02 11:23:58)
Difficulty: 3 of 5Under Dudeney minus one: Dudezero (in Just Math)
Posted on 2022-02-01 (3 Comments)
Solution computer solution (spoiler) by Charlie (2022-02-01 07:56:48)
Difficulty: 3 of 5Under Elemental State Settlement (in Word Problems)
Posted on 2022-01-29 (2 Comments)
Solution Answers by Charlie (2022-01-29 12:34:18)
Difficulty: 4 of 5Under Difference is sod sum (in Numbers)
Posted on 2022-01-28 (4 Comments)
re: FWIW by Charlie (2022-01-28 22:25:49)
Some Thoughts FWIQ by Charlie (2022-01-28 22:24:45)
Difficulty: 3 of 5Under Golden Ratio Gradation (in Algorithms)
Posted on 2022-01-27 (4 Comments)
Solution my take on it by Charlie (2022-01-27 11:42:35)
Difficulty: 3 of 5Under 2022 Multiple and Palindrome Puzzle (in Numbers)
Posted on 2022-01-25 (4 Comments)
Solution computer solution by Charlie (2022-01-25 13:33:53)
Difficulty: 3 of 5Under Fair, Handsome, and Unscarred (in Logic)
Posted on 2022-01-20 (3 Comments)
Solution solution by Charlie (2022-01-20 18:01:25)
Difficulty: 3 of 5Under Temperature Reflection 2 (in Just Math)
Posted on 2022-01-19 (1 Comments)
Solution computer solution by Charlie (2022-01-19 11:32:08)
Difficulty: 3 of 5Under All in (in Numbers)
Posted on 2022-01-18 (4 Comments)
re: solutions where I went wrong by Charlie (2022-01-18 22:36:45)
Solution solutions by Charlie (2022-01-18 09:27:45)
Difficulty: 3 of 5Under Letter Addition Crossed Country Conclusion (in Word Problems)
Posted on 2022-01-17 (2 Comments)
Solution first without then with computer by Charlie (2022-01-17 11:26:45)
Difficulty: 3 of 5Under Closest approaches (in Geometry)
Posted on 2022-01-14 (3 Comments)
Solution solution by Charlie (2022-01-14 11:07:23)
Difficulty: 3 of 5Under Pandiv 143 (in Numbers)
Posted on 2022-01-13 (1 Comments)
Answers--but not analytical (spoiler) by Charlie (2022-01-13 16:03:30)
Difficulty: 3 of 5Under Inconsiderable Five-Prime Ratio Illation (in Numbers)
Posted on 2022-01-12 (4 Comments)
computer solution by Charlie (2022-01-13 08:10:38)
Difficulty: 3 of 5Under Powers of 3, 4, and 7 Included (in Numbers)
Posted on 2022-01-10 (5 Comments)
lower number by Charlie (2022-01-10 11:37:04)
Difficulty: 3 of 5Under Perfect Powered Temperature (in Just Math)
Posted on 2022-01-09 (10 Comments)
Solution re: A much faster way -- the complete set for up to a trillion by Charlie (2022-01-10 07:39:42)
Solution A much faster way by Charlie (2022-01-09 20:31:53)
re: Corrigendum by Charlie (2022-01-09 12:10:27)
Solution computer solution by Charlie (2022-01-09 10:05:17)
Difficulty: 3 of 5Under Age of ages (2) (in Just Math)
Posted on 2022-01-08 (6 Comments)
Can someone correct my logic or find my error? by Charlie (2022-01-08 18:11:58)
Difficulty: 3 of 5Under Fahrenheit*Celsius equals Perfect Square (in Just Math)
Posted on 2022-01-07 (3 Comments)
Just a note by Charlie (2022-01-07 19:11:36)
Solution computer solution by Charlie (2022-01-07 09:55:28)
Difficulty: 3 of 5Under Find this word (in Word Problems)
Posted on 2022-01-06 (7 Comments)
Some Thoughts thoughts by Charlie (2022-01-06 09:26:49)
Difficulty: 3 of 5Under Either way (in Numbers)
Posted on 2022-01-05 (8 Comments)
re: computer solution (spoiler) -- continued by Charlie (2022-01-05 08:51:06)
Solution computer solution (spoiler) by Charlie (2022-01-05 08:49:13)
Difficulty: 2 of 5Under Etats Des Etats-Unis (in Word Problems)
Posted on 2022-01-04 (3 Comments)
re: Answers by Charlie (2022-01-04 10:53:14)
Difficulty: 2 of 5Under Temperature Temperament IV (in Just Math)
Posted on 2022-01-03 (3 Comments)
Solution computer solution by Charlie (2022-01-03 11:05:09)
Difficulty: 3 of 5Under function of s.o.d. of prime (in Numbers)
Posted on 2021-12-31 (2 Comments)
Solution computer solution by Charlie (2021-12-31 10:29:10)
Difficulty: 3 of 5Under Believe it or not 2 (in Numbers)
Posted on 2021-12-30 (2 Comments)
Solution computer solution by Charlie (2021-12-30 09:08:52)
Difficulty: 1 of 5Under KISS solution (in Just Math)
Posted on 2021-12-29 (8 Comments)
Solution levels by Charlie (2021-12-29 14:55:05)
Difficulty: 3 of 5Under Armstrong plus one : Armstwo (in Numbers)
Posted on 2021-12-27 (3 Comments)
Solution MATLAB solution by Charlie (2021-12-27 11:31:01)
Difficulty: 3 of 5Under Temperature Travail II (in Just Math)
Posted on 2021-12-25 (3 Comments)
Solution computer solution by Charlie (2021-12-25 19:54:34)
Difficulty: 3 of 5Under 6 out of 20 (in Cryptography)
Posted on 2021-12-23 (6 Comments)
Solution solution as far as I could arrange (spoilers) by Charlie (2021-12-24 12:50:19)
re(3): No. 1 by Charlie (2021-12-24 11:27:22)
Hints/Tips re: No. 1 by Charlie (2021-12-24 10:20:16)
No. 1 by Charlie (2021-12-24 07:08:23)
Difficulty: 3 of 5Under The not-always-lying islanders (in Logic)
Posted on 2021-12-22 (4 Comments)
Solution re: computer solution by Charlie (2021-12-22 13:24:54)
Solution computer solution by Charlie (2021-12-22 13:05:05)
Difficulty: 3 of 5Under Spanish Alphametic Settlement (in Numbers)
Posted on 2021-12-21 (3 Comments)
Solution Hybrid solution by Charlie (2021-12-21 10:27:47)
Difficulty: 3 of 5Under Factorion plus one: Factoritwo (in Numbers)
Posted on 2021-12-16 (2 Comments)
Solution solution by Charlie (2021-12-16 15:43:11)
Difficulty: 2 of 5Under Straight Up Inequality (in Just Math)
Posted on 2021-12-14 (2 Comments)
Solution computer guided solution by Charlie (2021-12-14 11:07:53)
Difficulty: 2 of 5Under Ninety Seven and Divisibility Nuance (in Just Math)
Posted on 2021-12-12 (10 Comments)
re(5): solution by Charlie (2021-12-12 19:30:50)
re(4): solution by Charlie (2021-12-12 18:07:46)
re(4): solution by Charlie (2021-12-12 16:26:15)
re(2): solution by Charlie (2021-12-12 15:19:21)
Solution solution by Charlie (2021-12-12 08:42:40)
Difficulty: 3 of 5Under AB Crossed Floor Product (in Just Math)
Posted on 2021-12-08 (2 Comments)
Solution solution by Charlie (2021-12-08 07:37:10)
Difficulty: 3 of 5Under ABBA words a.k.a. Test #12: (in Word Problems)
Posted on 2021-12-07 (3 Comments)
Solution computer solutions by Charlie (2021-12-07 10:41:14)
Difficulty: 3 of 5Under Factorial Removal Resolution (in Just Math)
Posted on 2021-12-01 (3 Comments)
Solution solution with a little help from the computer by Charlie (2021-12-01 11:50:44)
Difficulty: 2 of 5Under Count the trailing zeros (in Just Math)
Posted on 2021-11-30 (4 Comments)
re(2): solution -- answer for base 9 seems wrong by Charlie (2021-11-30 09:44:34)
re: solution -- answer for base 9 seems wrong by Charlie (2021-11-30 09:34:41)
Solution solution by Charlie (2021-11-30 09:08:32)
Difficulty: 3 of 5Under Nimble Exponent Extrication (in Just Math)
Posted on 2021-11-22 (3 Comments)
Solution computer solution by Charlie (2021-11-22 11:56:13)
Difficulty: 3 of 5Under Prove or verify (in Just Math)
Posted on 2021-11-18 (1 Comments)
simulation program by Charlie (2021-11-18 16:24:59)
Difficulty: 2 of 5Under Cubic Arithmetic Conclusion (in Just Math)
Posted on 2021-11-16 (4 Comments)
Solution computer solution by Charlie (2021-11-16 15:46:39)
Difficulty: 4 of 5Under Partially illuminated cone (in Calculus)
Posted on 2021-11-12 (10 Comments)
re: a hundred million points of light by Charlie (2021-11-14 11:44:28)
Solution a hundred million points of light by Charlie (2021-11-14 11:24:44)
re(2): soln by Charlie (2021-11-12 10:37:41)
re: soln by Charlie (2021-11-12 10:34:14)
Difficulty: 1 of 5Under I am 521634352 (in General)
Posted on 2021-11-08 (4 Comments)
Solution REMOTE MENTOR by Charlie (2021-11-08 12:09:35)
Difficulty: 3 of 5Under Pax vobiscum (in General)
Posted on 2021-11-05 (4 Comments)
re: dona nobis pacem by Charlie (2021-11-08 07:30:00)
dona nobis pacem by Charlie (2021-11-07 21:17:09)
Solution computer solution by Charlie (2021-11-05 14:55:38)
Difficulty: 4 of 5Under Hexomino tile enumeration (in Numbers)
Posted on 2021-10-27 (4 Comments)
Solution computer solution by Charlie (2021-10-27 13:19:01)
Difficulty: 3 of 5Under Left/Right side story (in Word Problems)
Posted on 2021-10-25 (1 Comments)
Solution parts 1, 2 and 4 via computer by Charlie (2021-10-25 16:53:20)
Difficulty: 3 of 5Under Quad-Ominoes (in Numbers)
Posted on 2021-10-20 (6 Comments)
re: possible solution by Charlie (2021-10-20 11:42:52)
Solution solution by Charlie (2021-10-20 11:41:12)
Difficulty: 3 of 5Under Actual triominoes (in Numbers)
Posted on 2021-10-13 (2 Comments)
Solution solution by Charlie (2021-10-13 11:42:39)
Difficulty: 2 of 5Under Expo 7629 (in Numbers)
Posted on 2021-09-27 (7 Comments)
Solution listing the possibilities--solution by Charlie (2021-09-27 13:13:35)
Difficulty: 3 of 5Under Imagine the points (in Just Math)
Posted on 2021-09-22 (3 Comments)
Solution computer solution by Charlie (2021-09-22 11:06:03)
Difficulty: 2 of 5Under Range (in Just Math)
Posted on 2021-09-20 (4 Comments)
Question re: Solution by Charlie (2021-09-20 14:11:26)
Solution solution by Charlie (2021-09-20 10:21:05)
Difficulty: 3 of 5Under 5 equilaterals (in Geometry)
Posted on 2021-09-10 (8 Comments)
For what it's worth by Charlie (2021-09-12 16:01:39)
What it looks like by Charlie (2021-09-12 12:22:34)
Solution re: solution(s) --- Correction! by Charlie (2021-09-12 12:03:37)
solution(s) by Charlie (2021-09-10 19:55:57)
Difficulty: 3 of 5Under Grid squares (in Just Math)
Posted on 2021-09-03 (7 Comments)
Solution Same answer by Charlie (2021-09-03 12:23:16)
Difficulty: 3 of 5Under Two spherical scoops (in Shapes)
Posted on 2021-08-24 (2 Comments)
Solution solution by Charlie (2021-08-24 10:31:17)
Difficulty: 3 of 5Under Inconvenient points (in Just Math)
Posted on 2021-08-23 (3 Comments)
Solution solution by Charlie (2021-08-23 11:57:46)
Difficulty: 3 of 5Under More balanced weighing (in Just Math)
Posted on 2021-08-20 (4 Comments)
Solution Let me count the ways -- computer solution by Charlie (2021-08-20 11:51:12)
Difficulty: 3 of 5Under 2 neighbours create a square (in Numbers)
Posted on 2021-08-19 (9 Comments)
solution ++ by Charlie (2021-08-19 10:45:11)
Difficulty: 3 of 5Under Prime pair equation (in Numbers)
Posted on 2021-08-18 (2 Comments)
Some Thoughts computer exploration by Charlie (2021-08-18 21:48:19)
Difficulty: 3 of 5Under Planar factor graphs (in Just Math)
Posted on 2021-08-16 (16 Comments)
re(4): Part 3 - K5 and K3,3 by Charlie (2021-08-19 10:29:52)
re(3): Part 3 - K5 and K3,3 by Charlie (2021-08-19 06:55:43)
re: Part 3 - K5 and K3,3 by Charlie (2021-08-18 17:54:04)
re: Part 3 - K5 and K3,3 by Charlie (2021-08-18 07:46:12)
re: Solution parts 1 and 2 by Charlie (2021-08-17 15:35:59)
part 3 by computer by Charlie (2021-08-17 11:50:07)
re: Setting an upper limit for 3 by Charlie (2021-08-17 08:33:46)
Setting an upper limit for 3 by Charlie (2021-08-17 08:23:07)
Some Thoughts 2b (therefore also 2a) by Charlie (2021-08-16 20:55:45)
Difficulty: 2 of 5Under Seven (in Sequences)
Posted on 2021-08-15 (2 Comments)
Solution computer solution by Charlie (2021-08-16 09:32:52)
Difficulty: 3 of 5Under Factorials and 2 powers (in Just Math)
Posted on 2021-08-13 (5 Comments)
Some Thoughts computer findings by Charlie (2021-08-13 09:22:08)
Difficulty: 3 of 5Under Many Heads part 2 (in Probability)
Posted on 2021-08-02 (2 Comments)
Solution trial and error with the computer by Charlie (2021-08-02 13:36:56)
Difficulty: 2 of 5Under Pyramid from a square (in Shapes)
Posted on 2021-07-29 (3 Comments)
Solution solution by Charlie (2021-07-29 11:32:35)
Difficulty: 3 of 5Under Triplet hunt (in Numbers)
Posted on 2021-07-27 (3 Comments)
Some Thoughts computer exploration by Charlie (2021-07-27 11:29:33)
Difficulty: 2 of 5Under Product of odd primes with distinct digits (in Numbers)
Posted on 2021-07-23 (5 Comments)
re: Brian and Charlie: note a few details by Charlie (2021-07-27 21:56:47)
Solution computer solution by Charlie (2021-07-23 14:16:24)
Difficulty: 3 of 5Under Four equal digits (in Numbers)
Posted on 2021-07-20 (5 Comments)
Solution computer solution by Charlie (2021-07-20 13:25:16)
Difficulty: 3 of 5Under Adjacent Square Sum II (in Just Math)
Posted on 2021-07-15 (1 Comments)
Solution computer solution (spoiler) by Charlie (2021-07-15 12:07:01)
Difficulty: 3 of 5Under Special dates (in Science)
Posted on 2021-07-06 (42 Comments)
re: No Subject by Charlie (2021-07-06 15:51:50)
Solution No Subject by Charlie (2021-07-06 15:06:16)
Solution a solution by Charlie (2021-07-06 11:47:55)
Difficulty: 3 of 5Under Prime pairs in power (in Numbers)
Posted on 2021-07-05 (6 Comments)
Some Thoughts limited computer search by Charlie (2021-07-05 09:45:52)
Difficulty: 4 of 5Under Circle Line Locus (in Just Math)
Posted on 2021-07-02 (9 Comments)
Well, that's not the curve by Charlie (2021-07-04 09:19:30)
re(2): what the curve looks like by Charlie (2021-07-03 20:01:27)
re(2): what the curve looks like by Charlie (2021-07-03 19:51:03)
re(2): what the curve looks like by Charlie (2021-07-02 21:00:35)
what the curve looks like by Charlie (2021-07-02 15:11:51)
Difficulty: 3 of 5Under Pascal's Lottery (in Probability)
Posted on 2021-07-01 (6 Comments)
re: Question by Charlie (2021-07-01 15:40:51)
Some Thoughts partial solution and some thoughts by Charlie (2021-07-01 10:45:25)
Difficulty: 3 of 5Under Reflection in Rectangle (in Just Math)
Posted on 2021-06-30 (5 Comments)
Solution solution by Charlie (2021-06-30 11:03:25)
Difficulty: 4 of 5Under Reversible Cubes (in Numbers)
Posted on 2021-06-29 (5 Comments)
Some Thoughts computer exploration by Charlie (2021-06-29 11:34:06)
Difficulty: 2 of 5Under Distinct routes (in Numbers)
Posted on 2021-06-24 (10 Comments)
re(2): solution and discussion by Charlie (2021-06-28 09:46:08)
extended by Charlie (2021-06-24 15:23:50)
Solution solution and discussion by Charlie (2021-06-24 11:43:36)
Difficulty: 3 of 5Under Three random squares (in Just Math)
Posted on 2021-06-23 (3 Comments)
Solution solution by Charlie (2021-06-23 11:51:11)
Difficulty: 3 of 5Under Digit equivalence (in Just Math)
Posted on 2021-06-22 (5 Comments)
re(2): solution by Charlie (2021-06-22 17:58:52)
Solution solution by Charlie (2021-06-22 10:42:59)
Difficulty: 3 of 5Under Mixed square (in Numbers)
Posted on 2021-06-18 (5 Comments)
re: partial answer by Charlie (2021-06-18 13:25:53)
Difficulty: 3 of 5Under The power of 37 (in Numbers)
Posted on 2021-06-17 (3 Comments)
Some Thoughts foolish extrapolation by Charlie (2021-06-17 10:11:19)
Difficulty: 2 of 5Under Prime count (in Numbers)
Posted on 2021-06-16 (3 Comments)
Solution ways by Charlie (2021-06-16 08:50:43)
Solution ways by Charlie (2021-06-16 08:50:43)
Difficulty: 3 of 5Under There Can Be Only Twelve (in Word Problems)
Posted on 2021-06-10 (4 Comments)
A failed theory by Charlie (2021-06-11 07:40:11)
Difficulty: 4 of 5Under Double negative (in Numbers)
Posted on 2021-06-09 (3 Comments)
c and d by Charlie (2021-06-09 14:13:54)
main problem and a by Charlie (2021-06-09 14:09:55)
Difficulty: 3 of 5Under Nine Pointed Sphere (in Shapes)
Posted on 2021-06-03 (12 Comments)
re: Using plane trig in 3 dimensions -- discrepancy resolved by Charlie (2021-06-06 12:58:23)
Using plane trig in 3 dimensions by Charlie (2021-06-05 18:07:02)
re(3): Solution -- Using spherical trig by Charlie (2021-06-04 13:48:32)
re(3): Solution -- Using spherical trig by Charlie (2021-06-04 13:45:17)
re: Solution -- Using spherical trig by Charlie (2021-06-04 06:49:40)
re: Picture -- aah and aha by Charlie (2021-06-03 21:19:34)
Difficulty: 2 of 5Under Let's play Bocce (in Probability)
Posted on 2021-06-02 (6 Comments)
Solution solution by Charlie (2021-06-02 10:32:07)
Difficulty: 3 of 5Under Rubik's Swap (in General)
Posted on 2021-06-01 (9 Comments)
Solution solution -- I think by Charlie (2021-06-01 12:25:59)
Difficulty: 3 of 5Under Linked List Deleted (in Algorithms)
Posted on 2021-05-31 (1 Comments)
Solution solution by Charlie (2021-05-31 09:20:21)
Difficulty: 3 of 5Under Gambler’s dilemma (in Probability)
Posted on 2021-05-28 (8 Comments)
Solution computer solution by Charlie (2021-05-28 11:12:11)
Difficulty: 3 of 5Under Four word classes (in Word Problems)
Posted on 2021-05-27 (5 Comments)
re: from a common word list by Charlie (2021-05-29 08:30:43)
Some Thoughts from my word list by Charlie (2021-05-27 10:08:34)
Difficulty: 4 of 5Under Card Deck: Complete a set, before... (in Probability)
Posted on 2021-05-25 (3 Comments)
re: Solution to extra challenge #2 by Charlie (2021-05-26 15:24:47)
Difficulty: 2 of 5Under Eleven as mandatory divider (in Sequences)
Posted on 2021-05-24 (5 Comments)
Some Thoughts re: Part a. (but no proof) by Charlie (2021-05-24 12:11:44)
Difficulty: 4 of 5Under The Loopy Lunatic (in Science)
Posted on 2021-05-20 (8 Comments)
Solution what I got by Charlie (2021-05-20 11:22:45)
Difficulty: 2 of 5Under Square creates square (in Numbers)
Posted on 2021-05-18 (9 Comments)
Solution computer solution by Charlie (2021-05-18 09:05:59)
Difficulty: 3 of 5Under Hexagon area (in Just Math)
Posted on 2021-05-17 (2 Comments)
Solution solution by Charlie (2021-05-17 12:18:07)
Difficulty: 3 of 5Under A Country, a City and a pamphlet (in Numbers)
Posted on 2021-05-11 (4 Comments)
MATLAB software by Charlie (2021-05-11 23:21:24)
Difficulty: 3 of 5Under Fibonacci Inequality (in Just Math)
Posted on 2021-05-06 (4 Comments)
Solution solution by Charlie (2021-05-06 12:42:59)
Difficulty: 2 of 5Under Plus operator insertion (in Numbers)
Posted on 2021-05-03 (2 Comments)
Solution solution by Charlie (2021-05-03 08:52:43)
Difficulty: 3 of 5Under Locus amid two intersecting circles (in Geometry)
Posted on 2021-04-30 (5 Comments)
Some Thoughts Playing with Geometer's Sketchpad by Charlie (2021-04-30 08:50:29)
Difficulty: 3 of 5Under Reverse and add in binary (in Numbers)
Posted on 2021-04-29 (8 Comments)
re: Smallest? by Charlie (2021-05-03 09:00:07)
Some Thoughts there seems to be a pattern here by Charlie (2021-04-29 07:45:10)
Difficulty: 3 of 5Under Minimize parallelogram diagonal (in Geometry)
Posted on 2021-04-28 (4 Comments)
Solution solution, intuitively by Charlie (2021-04-28 08:58:52)
Difficulty: 1 of 5Under Chemical Sequence (in Science)
Posted on 2021-04-26 (5 Comments)
Solution solution by Charlie (2021-04-26 10:21:06)
Difficulty: 2 of 5Under Erased to a multiple of 7 (in Numbers)
Posted on 2021-04-21 (5 Comments)
Solution computer solution by Charlie (2021-04-21 10:39:46)
Difficulty: 3 of 5Under quadratic ^ quadratic (in General)
Posted on 2021-04-06 (5 Comments)
Solution proposed solution by Charlie (2021-04-06 10:59:00)
Difficulty: 3 of 5Under Knight tour in an infinite board (in Just Math)
Posted on 2021-04-01 (2 Comments)
Solution computer exploration and solution by Charlie (2021-04-01 12:32:23)
Difficulty: 3 of 5Under Don't walk! (in General)
Posted on 2021-03-24 (16 Comments)
just a comment by Charlie (2021-03-24 09:59:42)
Difficulty: 2 of 5Under With or without (in Numbers)
Posted on 2021-03-22 (5 Comments)
Solution to be more exact by Charlie (2021-03-22 10:22:51)
Difficulty: 3 of 5Under Induced divisibility (in Just Math)
Posted on 2021-03-18 (7 Comments)
Some Thoughts a pattern by Charlie (2021-03-18 12:41:55)
re: Solution (i think) by Charlie (2021-03-18 11:30:59)
Difficulty: 2 of 5Under The fibbons (in Numbers)
Posted on 2021-03-16 (6 Comments)
Solution computer solution by Charlie (2021-03-16 10:58:20)
Difficulty: 3 of 5Under A thin triangle (in Shapes)
Posted on 2021-03-11 (3 Comments)
Solution computer solution by Charlie (2021-03-11 10:00:29)
Difficulty: 3 of 5Under Beat The Book (in Probability)
Posted on 2021-03-10 (10 Comments)
re: Almost Guaranteed profit? by Charlie (2021-03-10 18:33:30)
Some Thoughts computer calculations by Charlie (2021-03-10 12:39:51)
Difficulty: 3 of 5Under Numeric card game (in Just Math)
Posted on 2021-03-04 (6 Comments)
Solution solution by Charlie (2021-03-04 17:21:15)
Difficulty: 4 of 5Under Reciprocal Equation #6 (in Just Math)
Posted on 2021-02-28 (3 Comments)
Solution re: computer solution by Charlie (2021-02-28 10:07:32)
Solution computer solution by Charlie (2021-02-28 09:41:41)
Difficulty: 3 of 5Under The class of ‘55’ (in Numbers)
Posted on 2021-02-27 (4 Comments)
Solution computer solution by Charlie (2021-02-27 15:55:35)
Difficulty: 4 of 5Under Circular Reasoning (in Probability)
Posted on 2021-02-23 (4 Comments)
re: A quibble by Charlie (2021-02-23 21:10:29)
Solution solution by Charlie (2021-02-23 09:45:48)
Difficulty: 3 of 5Under Differences of the fraction (in Just Math)
Posted on 2021-02-20 (6 Comments)
The current hypothesis by Charlie (2021-02-21 18:13:22)
Some Thoughts re: A boy named Alice by Charlie (2021-02-21 14:07:43)
re: Just some guesses by Charlie (2021-02-21 14:06:13)
re: Just some guesses (showing the crunched numbers) by Charlie (2021-02-20 18:20:27)
Difficulty: 2 of 5Under Trapezium in polygon (in Numbers)
Posted on 2021-02-18 (3 Comments)
Solution computer exploration and solution (spoiler) by Charlie (2021-02-18 10:54:02)
Difficulty: 2 of 5Under Integer sides of cuboid (in Numbers)
Posted on 2021-02-17 (7 Comments)
Solution computer solution by Charlie (2021-02-17 10:05:26)
Difficulty: 2 of 5Under A Rebus (in Word Problems)
Posted on 2021-02-15 (2 Comments)
Hints/Tips Hint by Charlie (2021-02-18 18:59:18)
Difficulty: 2 of 5Under Less than 100 (in Numbers)
Posted on 2021-02-14 (3 Comments)
Solution computer solution by Charlie (2021-02-14 08:59:24)
Difficulty: 2 of 5Under Squares concatenated to square (in Numbers)
Posted on 2021-02-13 (3 Comments)
Solution computer solutions by Charlie (2021-02-13 14:05:42)
Difficulty: 3 of 5Under Solve in naturals (in Numbers)
Posted on 2021-02-12 (3 Comments)
Some Thoughts limited search by Charlie (2021-02-12 10:28:19)
Difficulty: 3 of 5Under As close as possible (in Numbers)
Posted on 2021-02-11 (3 Comments)
Solution solutions by Charlie (2021-02-11 08:29:18)
Difficulty: 3 of 5Under As time goes by (in Sequences)
Posted on 2021-02-09 (7 Comments)
re(2): Error/. Please correct before solving! by Charlie (2021-02-10 13:05:02)
Difficulty: 3 of 5Under Mission 55 (in Numbers)
Posted on 2021-02-08 (6 Comments)
even pos- even pos sorted by positions by Charlie (2021-02-08 11:59:26)
re: Harder solutions, full answer by Charlie (2021-02-08 11:48:47)
Solution computer solution for the full list by Charlie (2021-02-08 10:17:20)
Difficulty: 4 of 5Under Powered to perfect (in Numbers)
Posted on 2021-02-07 (7 Comments)
making it more probable by Charlie (2021-02-07 12:02:23)
Difficulty: 3 of 5Under Isosceles split (in Geometry)
Posted on 2021-02-01 (1 Comments)
Solution solution by Charlie (2021-02-01 13:01:34)
Difficulty: 3 of 5Under Entries of a matrix (in Just Math)
Posted on 2021-01-29 (5 Comments)
Solution Truly computer solution (spoiler) by Charlie (2021-01-29 18:04:44)
re: Trivial solution for n=2 by Charlie (2021-01-29 18:02:24)
Difficulty: 3 of 5Under Three circles on sphere (in Just Math)
Posted on 2021-01-27 (2 Comments)
Some Thoughts an observation by Charlie (2021-01-28 06:55:14)
Difficulty: 4 of 5Under Never consecutive (in Probability)
Posted on 2021-01-26 (7 Comments)
reduced fractions by Charlie (2021-01-28 16:18:58)
Neatening the table by Charlie (2021-01-27 11:06:16)
numerators and denominators separately by Charlie (2021-01-26 13:16:09)
Some Thoughts by algorithm by Charlie (2021-01-26 11:54:00)
Some Thoughts simulations for comparison by Charlie (2021-01-26 10:19:46)
Difficulty: 2 of 5Under 33rd Powers (in Numbers)
Posted on 2021-01-25 (5 Comments)
Solution simpler solution (D-zero) by Charlie (2021-01-25 10:22:03)
Difficulty: 3 of 5Under Sort them out (in Word Problems)
Posted on 2021-01-23 (4 Comments)
Some Thoughts Coincidence or not? by Charlie (2021-01-23 08:22:26)
Difficulty: 3 of 5Under Sweet little sixteen (in Just Math)
Posted on 2021-01-18 (2 Comments)
Some Thoughts No proof but... by Charlie (2021-01-18 10:24:57)
Difficulty: 3 of 5Under 3 to 6 letters (in Word Problems)
Posted on 2021-01-16 (9 Comments)
re: 6-letter words via program; smaller from head by Charlie (2021-01-17 13:40:24)
re: 6-letter words via program; smaller from head by Charlie (2021-01-17 13:09:02)
Solution 6-letter words via program; smaller from head by Charlie (2021-01-17 12:08:48)
Difficulty: 3 of 5Under Solitaire: Probability Of No First Move (in Probability)
Posted on 2021-01-12 (5 Comments)
Solution simulations by Charlie (2021-01-12 10:51:48)
Difficulty: 3 of 5Under Go one, two, three (in Numbers)
Posted on 2021-01-09 (6 Comments)
Some Thoughts re: computer exploration (spoilers) -- just noticed by Charlie (2021-01-09 13:07:47)
Some Thoughts computer exploration (spoilers) by Charlie (2021-01-09 11:20:47)
Difficulty: 3 of 5Under 1 2 4 8 (in General)
Posted on 2021-01-08 (3 Comments)
Solution computer-aided solution by Charlie (2021-01-08 10:41:37)
Difficulty: 2 of 5Under Go do modulus (in Numbers)
Posted on 2021-01-02 (8 Comments)
Some Thoughts computer exploration by Charlie (2021-01-02 15:33:11)
Difficulty: 4 of 5Under Not The Weakest Link (in Probability)
Posted on 2020-12-28 (8 Comments)
The "official" solution is available for comment by Charlie (2020-12-31 07:36:41)
Difficulty: 4 of 5Under Five numbers and Six sums (in Numbers)
Posted on 2020-12-20 (5 Comments)
re: Another possibility by Charlie (2020-12-23 10:55:41)
Solution MATLAB solution by Charlie (2020-12-20 11:22:22)
Difficulty: 2 of 5Under Conditional pairs (in Just Math)
Posted on 2020-12-19 (7 Comments)
Solution program to find a solution by Charlie (2020-12-19 13:12:05)
Difficulty: 2 of 5Under Box and cube rooted (in Numbers)
Posted on 2020-12-14 (7 Comments)
re: Solution by Charlie (2020-12-14 13:39:20)
Solution re: Solution -- my found value by Charlie (2020-12-14 12:04:51)
Difficulty: 2 of 5Under 3 and 3 and... (in Numbers)
Posted on 2020-12-13 (3 Comments)
Solution computer solution -- hope there are no bugs by Charlie (2020-12-13 13:42:11)
Difficulty: 3 of 5Under Sin sum (in Just Math)
Posted on 2020-12-11 (14 Comments)
Max and Min biased, but constant difference between by Charlie (2020-12-11 10:40:21)
Difficulty: 4 of 5Under Complete number (in Numbers)
Posted on 2020-12-09 (3 Comments)
Solution computer solution by Charlie (2020-12-09 12:35:15)
Difficulty: 3 of 5Under Equation in integers (in Numbers)
Posted on 2020-12-06 (5 Comments)
Some Thoughts computer exploration by Charlie (2020-12-06 15:37:26)
Difficulty: 3 of 5Under Shortest way to a million (in Numbers)
Posted on 2020-12-03 (15 Comments)
re: A start by Charlie (2020-12-03 10:38:07)
Difficulty: 3 of 5Under Missing side of hexagon (in Geometry)
Posted on 2020-12-02 (2 Comments)
Solution solution by Charlie (2020-12-02 14:33:00)
Difficulty: 3 of 5Under Concatenation equals Sum of Squares (in Numbers)
Posted on 2020-12-01 (5 Comments)
re(3): soln by Charlie (2020-12-01 14:52:17)
Solution re: soln by Charlie (2020-12-01 12:48:00)
Difficulty: 2 of 5Under Permuted sums (in Just Math)
Posted on 2020-11-30 (7 Comments)
Solution solving for the original numbers with MATLAB by Charlie (2020-11-30 10:28:10)
Difficulty: 2 of 5Under Weird shuffling (in Just Math)
Posted on 2020-11-29 (8 Comments)
re(4): computer verification -- simulation by Charlie (2020-11-30 20:08:28)
re(3): computer verification -- simulation by Charlie (2020-11-29 20:57:32)
Solution re(2): computer verification -- simulation by Charlie (2020-11-29 20:50:02)
Solution re: computer verification -- bug -- changed result by Charlie (2020-11-29 18:43:18)
Solution computer verification by Charlie (2020-11-29 15:40:07)
Difficulty: 2 of 5Under 2 absent digits (in Numbers)
Posted on 2020-11-28 (6 Comments)
Solution computer solution with an extension by Charlie (2020-11-28 12:30:37)
Difficulty: 3 of 5Under Maximal of a function (in Calculus)
Posted on 2020-11-25 (2 Comments)
also minima by Charlie (2020-11-25 15:09:57)
Some Thoughts No proof, but approx max found by Charlie (2020-11-25 14:24:53)
Difficulty: 2 of 5Under Rubik's cut (in Just Math)
Posted on 2020-11-24 (2 Comments)
Solution solution by Charlie (2020-11-24 13:00:13)
Difficulty: 2 of 5Under Calculator at rescue? (in Just Math)
Posted on 2020-11-23 (5 Comments)
Question What does it mean? by Charlie (2020-11-23 10:38:24)
Difficulty: 2 of 5Under Why Fight II (in Numbers)
Posted on 2020-11-18 (1 Comments)
Solution computer alphametic solution; manual matching of the phrases by Charlie (2020-11-18 14:53:32)
Difficulty: 2 of 5Under Go left of the number (in Numbers)
Posted on 2020-11-15 (5 Comments)
Hints/Tips an idea (with spoiler--solution) by Charlie (2020-11-15 11:49:18)
Difficulty: 3 of 5Under Dive deep after the decimal point (in Numbers)
Posted on 2020-11-13 (2 Comments)
Some Thoughts unsatisfying computer solution by Charlie (2020-11-14 20:40:24)
Difficulty: 3 of 5Under Fit the middle digit (in Numbers)
Posted on 2020-11-12 (4 Comments)
Solution computer solution by Charlie (2020-11-12 16:11:33)
Difficulty: 3 of 5Under Clock a doodle do (in Just Math)
Posted on 2020-11-09 (4 Comments)
Solution re: solution -- the times by Charlie (2020-11-09 12:18:44)
Solution solution by Charlie (2020-11-09 09:55:43)
Difficulty: 3 of 5Under Sequence number compressed (in Just Math)
Posted on 2020-10-28 (7 Comments)
re(2): computer solution by Charlie (2020-10-28 19:11:07)
Solution computer solution by Charlie (2020-10-28 10:52:22)
Difficulty: 3 of 5Under Money giveaway (in Numbers)
Posted on 2020-10-26 (5 Comments)
re: A possible generalization by Charlie (2020-10-29 10:30:24)
Solution The values by Charlie (2020-10-26 15:25:56)
Difficulty: 2 of 5Under Quick divisibility (in Numbers)
Posted on 2020-10-20 (8 Comments)
Solution the computer method by Charlie (2020-10-20 09:33:54)
Difficulty: 3 of 5Under Concatenation of Prime Factors is Pandigital (in Numbers)
Posted on 2020-10-15 (2 Comments)
Solution computer solution -- spoiler by Charlie (2020-10-15 10:39:46)
Difficulty: 3 of 5Under Find the pairs (in Numbers)
Posted on 2020-10-13 (22 Comments)
Some Thoughts computer exploration by Charlie (2020-10-13 10:22:11)
Difficulty: 3 of 5Under The angle bisectors (in Geometry)
Posted on 2020-10-10 (1 Comments)
Solution computer solution by Charlie (2020-10-10 15:29:57)
Difficulty: 3 of 5Under Pages and Squires 2 (in Liars and Knights)
Posted on 2020-10-08 (2 Comments)
Solution solution without proof of uniqueness by Charlie (2020-10-08 13:47:48)
Difficulty: 3 of 5Under Gold-in pyramid (in Shapes)
Posted on 2020-10-06 (7 Comments)
Solution re(2): computer solution by Charlie (2020-10-07 15:50:23)
re: computer solution by Charlie (2020-10-07 09:06:12)
Some Thoughts computer solution by Charlie (2020-10-07 06:59:46)
Difficulty: 2 of 5Under All odd digit (in Numbers)
Posted on 2020-10-05 (7 Comments)
Solution solution by Charlie (2020-10-05 10:49:40)
Difficulty: 2 of 5Under Triplets cubed (in Numbers)
Posted on 2020-10-04 (3 Comments)
Solution part b by Charlie (2020-10-04 12:02:58)
Solution part a by Charlie (2020-10-04 11:57:36)
Difficulty: 2 of 5Under Look b4 U leap (in Logic)
Posted on 2020-10-02 (8 Comments)
just to make it the intended target by Charlie (2020-10-02 13:48:47)
Difficulty: 2 of 5Under Prime equation 2 (in Numbers)
Posted on 2020-10-01 (4 Comments)
Some Thoughts computer findings by Charlie (2020-10-01 09:45:39)
Difficulty: 3 of 5Under What follows? (in Sequences)
Posted on 2020-09-26 (2 Comments)
Some Thoughts I don't know if this helps, but... by Charlie (2020-09-26 08:01:53)
Difficulty: 3 of 5Under Extreme inequality (in Just Math)
Posted on 2020-09-23 (4 Comments)
continuation: computer exploration--probably complete solution by Charlie (2020-09-23 09:40:49)
Solution computer exploration--probably complete solution by Charlie (2020-09-23 09:38:48)
Difficulty: 3 of 5Under Must be prime (in Sequences)
Posted on 2020-09-22 (1 Comments)
Some Thoughts one possible take on it by Charlie (2020-09-22 10:58:39)
Difficulty: 3 of 5Under An Iterated Floor Equation (in Numbers)
Posted on 2020-09-15 (9 Comments)
Solution the graph and table method by Charlie (2020-09-15 13:54:23)
Difficulty: 4 of 5Under 50 - or more (in Numbers)
Posted on 2020-09-10 (14 Comments)
re(3): Record by Charlie (2020-09-17 07:11:11)
re(3): some hints & remarks @ Ch by Charlie (2020-09-11 07:38:31)
re: Record by Charlie (2020-09-10 20:58:48)
Some Thoughts another, higher by Charlie (2020-09-10 15:17:37)
Some Thoughts computer finding by Charlie (2020-09-10 14:25:40)
Difficulty: 2 of 5Under 2 related tasks (in Numbers)
Posted on 2020-09-07 (5 Comments)
Another solution for first by Charlie (2020-09-08 06:35:47)
Difficulty: 4 of 5Under Cities, Countries and Colors (in Word Problems)
Posted on 2020-09-06 (2 Comments)
Solution some computer assistance by Charlie (2020-09-06 11:29:06)
Difficulty: 3 of 5Under WG’s unique number (in Numbers)
Posted on 2020-09-04 (8 Comments)
re: alternatively.... by Charlie (2020-09-04 21:47:07)
computer method solution by Charlie (2020-09-04 11:57:15)
Difficulty: 4 of 5Under A peculiar function! (in Just Math)
Posted on 2020-09-03 (5 Comments)
re: computer solution and a fitted polynomial by Charlie (2020-09-03 18:49:18)
Solution computer solution and a fitted polynomial by Charlie (2020-09-03 12:11:10)
Difficulty: 3 of 5Under Permuted average (in Numbers)
Posted on 2020-09-01 (4 Comments)
Solution computer solution and discussion by Charlie (2020-09-01 11:00:36)
Difficulty: 2 of 5Under Now, before and later (in Numbers)
Posted on 2020-08-26 (2 Comments)
Some Thoughts Is this a solution? by Charlie (2020-08-26 15:49:59)
Difficulty: 3 of 5Under Square Reciprocal Summation (in Just Math)
Posted on 2020-08-25 (5 Comments)
re: Here is another... No computer used this time. by Charlie (2020-08-26 07:13:04)
Solution UBASIC solution by Charlie (2020-08-25 11:22:20)
Difficulty: 2 of 5Under Check this sequence (in Sequences)
Posted on 2020-08-24 (3 Comments)
Solution parts 1 & 2 - computer solution by Charlie (2020-08-24 20:07:33)
Difficulty: 3 of 5Under Average Of Digits of powers (in Numbers)
Posted on 2020-08-20 (7 Comments)
Solution re(3): Misunderstanding of Part 3 by Charlie (2020-08-23 18:40:22)
Solution computer solution by Charlie (2020-08-20 21:38:52)
Difficulty: 2 of 5Under Ask and solve cubes (in Numbers)
Posted on 2020-08-17 (5 Comments)
re(2): computer solution by Charlie (2020-08-25 11:31:12)
computer solution by Charlie (2020-08-17 14:43:53)
Difficulty: 2 of 5Under Numbered Balls in Test Tubes 2 (in Logic)
Posted on 2020-08-10 (5 Comments)
re: One way - may not be optimal? by Charlie (2020-08-11 07:10:50)
Difficulty: 4 of 5Under Cosine cups (in Shapes)
Posted on 2020-08-07 (7 Comments)
re: Solution by Charlie (2020-08-10 07:31:54)
re: Solution by Charlie (2020-08-09 21:52:30)
re: If... by Charlie (2020-08-08 07:35:07)
Some Thoughts If... by Charlie (2020-08-07 12:09:02)
Difficulty: 3 of 5Under Three Digit Number 3 (in Numbers)
Posted on 2020-08-05 (5 Comments)
Solution choices, with solution by Charlie (2020-08-05 12:32:40)
Difficulty: 2 of 5Under Erase a prime (in Numbers)
Posted on 2020-08-03 (5 Comments)
Solution computer solution by Charlie (2020-08-03 13:45:23)
Difficulty: 3 of 5Under Yoshigahara's Masterpiece (in Logic)
Posted on 2020-07-31 (3 Comments)
re(2): Ez by Charlie (2020-09-02 06:57:33)
Difficulty: 3 of 5Under Gamow's Elevator (in Probability)
Posted on 2020-07-26 (10 Comments)
re(3): what I have so far... -- Hint by Charlie (2020-07-28 07:03:03)
Hints/Tips re: what I have so far... -- Hint by Charlie (2020-07-27 21:51:43)
clarifications by Charlie (2020-07-27 07:03:52)
Difficulty: 3 of 5Under 7 matches (in Word Problems)
Posted on 2020-07-15 (3 Comments)
Solution computer solution by Charlie (2020-07-15 22:52:22)
Difficulty: 2 of 5Under A prime and a cube (in Numbers)
Posted on 2020-07-13 (11 Comments)
re(2): Just an observation (on an interesting program line) by Charlie (2020-07-14 07:35:28)
re(2): Just an observation by Charlie (2020-07-13 17:32:39)
re: Just an observation by Charlie (2020-07-13 15:44:09)
Some Thoughts Just an observation by Charlie (2020-07-13 15:23:45)
Difficulty: 3 of 5Under 7 hypotenuses (in Numbers)
Posted on 2020-07-10 (4 Comments)
re: Research by Charlie (2020-07-13 07:48:35)
Solution computer solution by Charlie (2020-07-10 10:24:33)
Difficulty: 3 of 5Under Four generations (in Numbers)
Posted on 2020-07-06 (9 Comments)
Solution apologies to steven by Charlie (2020-07-06 10:34:16)
re: part 1 via computer by Charlie (2020-07-06 10:22:55)
Solution computer solution by Charlie (2020-07-06 10:15:25)
Difficulty: 3 of 5Under Average other (in Numbers)
Posted on 2020-07-01 (6 Comments)
Solution computer solution by Charlie (2020-07-01 18:55:33)
Difficulty: 4 of 5Under A coded text (in General)
Posted on 2020-06-26 (5 Comments)
Solution VB program and solution by Charlie (2020-06-26 14:34:05)
Difficulty: 3 of 5Under Best quotient (in Word Problems)
Posted on 2020-06-24 (4 Comments)
No Subject by Charlie (2020-06-24 21:03:13)
Difficulty: 4 of 5Under Fibo's common divider (in Sequences)
Posted on 2020-06-10 (4 Comments)
re: computer solution by Charlie (2020-06-11 05:49:13)
Solution computer solution by Charlie (2020-06-10 19:18:12)
Difficulty: 2 of 5Under Can you do it? (in Games)
Posted on 2020-06-08 (4 Comments)
Solution solution by Charlie (2020-06-08 21:40:37)
Difficulty: 2 of 5Under Almost a half (in Just Math)
Posted on 2020-05-15 (6 Comments)
re(2): solution (to tedious to do manually) by Charlie (2020-05-15 10:59:52)
Solution solution (to tedious to do manually) by Charlie (2020-05-15 09:46:18)
re: Possible solution by Charlie (2020-05-15 09:42:06)
Difficulty: 3 of 5Under Luck beats theory (in Probability)
Posted on 2020-05-04 (3 Comments)
Solution a. and b. by Charlie (2020-05-04 22:54:55)
Difficulty: 3 of 5Under WG's portfolio (in Just Math)
Posted on 2020-04-27 (4 Comments)
Solution agree with xdog's solution by Charlie (2020-04-27 18:56:14)
Difficulty: 3 of 5Under Two Digit Average 2 (in Numbers)
Posted on 2020-04-15 (2 Comments)
Solution of course by Charlie (2020-04-16 07:58:35)
Difficulty: 4 of 5Under Select the right subset (in Word Problems)
Posted on 2020-04-10 (3 Comments)
re: max found by computer by Charlie (2020-04-10 11:45:01)
re: max found by computer by Charlie (2020-04-10 11:34:42)
Some Thoughts max found by computer by Charlie (2020-04-10 11:28:58)
Difficulty: 2 of 5Under Digits of numbers (in Numbers)
Posted on 2020-03-30 (4 Comments)
Solution solution by Charlie (2020-03-30 21:12:59)
Difficulty: 2 of 5Under p(Ascending Number) closest to .01 (in Probability)
Posted on 2020-03-16 (3 Comments)
Solution the full set by Charlie (2020-03-16 15:08:07)
Difficulty: 2 of 5Under What time is it now? (in General)
Posted on 2020-03-09 (7 Comments)
re: Solution by Charlie (2020-03-09 18:53:00)
Difficulty: 3 of 5Under The Celebrated Jumping Frog of Perplexus County (in Probability)
Posted on 2020-03-04 (2 Comments)
Solution analysis and simulation by Charlie (2020-03-04 12:34:07)
Difficulty: 2 of 5Under Thrifty dates (in Numbers)
Posted on 2020-02-22 (3 Comments)
Solution computer solution --posted a bit later than 20:20 GMT by Charlie (2020-02-22 14:13:08)
Difficulty: 4 of 5Under Coded Crossword 3 (in Cryptography)
Posted on 2020-02-21 (4 Comments)
Solution manual solution with computer assistance for making substitutions by Charlie (2020-02-22 14:49:53)
Difficulty: 4 of 5Under pot draw permutations (in Numbers)
Posted on 2020-02-12 (2 Comments)
Some Thoughts outline of a solution methodology by Charlie (2020-02-12 19:01:48)
Difficulty: 3 of 5Under Certain old trade (in General)
Posted on 2020-01-22 (5 Comments)
Some Thoughts needs someone who knows Italian by Charlie (2020-01-22 10:22:58)
Difficulty: 4 of 5Under 13 L2L (in Word Problems)
Posted on 2019-12-25 (8 Comments)
Some Thoughts some thoughts by Charlie (2019-12-25 21:21:57)
Difficulty: 3 of 5Under Three Squares make a Triangle (in Shapes)
Posted on 2019-12-23 (3 Comments)
Some Thoughts partial approximate solution via GSP by Charlie (2019-12-23 13:32:32)
Difficulty: 3 of 5Under Poetry, not poverty (in Just Math)
Posted on 2019-12-18 (3 Comments)
Solution computer solution (spoiler) by Charlie (2019-12-18 12:34:41)
Difficulty: 3 of 5Under Gold in the Exponent (in Numbers)
Posted on 2019-12-11 (6 Comments)
Some Thoughts computer solution by Charlie (2019-12-11 12:47:13)
Difficulty: 3 of 5Under Nobody's Perfect (in Just Math)
Posted on 2019-12-04 (11 Comments)
guesstimate by Charlie (2019-12-04 15:30:49)
Difficulty: 3 of 5Under Can we use Pigeonhole? (in Numbers)
Posted on 2019-11-26 (3 Comments)
My apologies for the previous title by Charlie (2019-11-26 11:33:27)
Solution my solution -- without pigeonhole -- including lowest such number by Charlie (2019-11-26 11:29:13)
Difficulty: 3 of 5Under Spherplex (in Just Math)
Posted on 2019-11-25 (4 Comments)
Solution solution by Charlie (2019-11-25 10:37:42)
Difficulty: 3 of 5Under SOD cubed equals Sum of Squares of SODs (in Numbers)
Posted on 2019-11-20 (4 Comments)
Solution computer-aided solution by Charlie (2019-11-20 14:15:56)
Difficulty: 3 of 5Under The Big Division (in Numbers)
Posted on 2019-11-18 (5 Comments)
Solution solution the other way around by Charlie (2019-11-18 12:31:20)
Difficulty: 3 of 5Under Factor distribution in a school (in Numbers)
Posted on 2019-11-13 (15 Comments)
re: maybe a soln..... by Charlie (2019-11-13 15:04:33)
Difficulty: 3 of 5Under Roll a unit (in Probability)
Posted on 2019-11-06 (3 Comments)
Solution In-the-head solution (spoiler) by Charlie (2019-11-06 10:31:12)
Difficulty: 3 of 5Under Two methods (in Word Problems)
Posted on 2019-10-30 (3 Comments)
Solution computer-aided solution by Charlie (2019-10-30 15:43:12)
Difficulty: 3 of 5Under Cube rooted till 2019 (in Just Math)
Posted on 2019-10-23 (4 Comments)
Solution computer summation--spoiler by Charlie (2019-10-23 13:17:47)
Difficulty: 2 of 5Under Ardent tennis player (in Just Math)
Posted on 2019-10-22 (2 Comments)
Solution solution by Charlie (2019-10-22 13:58:12)
Difficulty: 2 of 5Under Interval Guessing (in General)
Posted on 2019-10-21 (10 Comments)
Some Thoughts correction to previous post by Charlie (2019-10-25 18:33:40)
re(2): Full solution: 15 and beyond by Charlie (2019-10-25 11:53:07)
re(3): some thoughts -- cases of small n by Charlie (2019-10-23 21:36:27)
re: some thoughts -- cases of small n by Charlie (2019-10-23 13:37:56)
Solution solution by Charlie (2019-10-21 21:16:51)
Difficulty: 3 of 5Under Some Sum of Some Sum (in Numbers)
Posted on 2019-10-18 (3 Comments)
Solution computer solution by Charlie (2019-10-18 13:34:48)
Difficulty: 4 of 5Under It's not a Magic Square (in Numbers)
Posted on 2019-10-17 (2 Comments)
Solution computer solution by Charlie (2019-10-17 13:53:36)
Difficulty: 3 of 5Under Tricky sums indeed! (in Numbers)
Posted on 2019-10-10 (3 Comments)
Solution computer-aided solution by Charlie (2019-10-10 12:08:48)
Difficulty: 3 of 5Under One in all (in Word Problems)
Posted on 2019-10-09 (6 Comments)
some answers by Charlie (2019-10-09 13:45:25)
Difficulty: 3 of 5Under The middle number (in Probability)
Posted on 2019-10-08 (5 Comments)
Solution solution by Charlie (2019-10-08 14:38:50)
re: proposed solution by Charlie (2019-10-08 13:35:47)
Difficulty: 2 of 5Under An important virtue (in Word Problems)
Posted on 2019-10-07 (2 Comments)
Solution spoiler by Charlie (2019-10-07 14:32:55)
Difficulty: 3 of 5Under 8 eights, 8 ones (in Just Math)
Posted on 2019-10-01 (4 Comments)
Solution computer solution by Charlie (2019-10-01 15:44:37)
Difficulty: 3 of 5Under Hexagonal interior point (in Geometry)
Posted on 2019-09-24 (6 Comments)
Solution solution by Charlie (2019-09-24 14:57:14)
Difficulty: 4 of 5Under Hexagonal Spider Web (in Probability)
Posted on 2019-09-12 (7 Comments)
re: my solution by Charlie (2019-09-12 19:34:38)
re: my solution by Charlie (2019-09-12 19:03:28)
Solution my solution by Charlie (2019-09-12 18:49:10)
Difficulty: 3 of 5Under A matter of perspective (in Shapes)
Posted on 2019-09-11 (1 Comments)
Solution solution by Charlie (2019-09-11 09:57:14)
Difficulty: 2 of 5Under One way out (in Just Math)
Posted on 2019-09-09 (2 Comments)
Solution solution by Charlie (2019-09-09 09:29:05)
Difficulty: 3 of 5Under Reduced to single digit (in Numbers)
Posted on 2019-09-06 (14 Comments)
re(4): Possible solution by Charlie (2019-09-13 20:46:43)
re: Thoughts by Charlie (2019-09-10 12:47:44)
Difficulty: 3 of 5Under 14 * A to T (in Word Problems)
Posted on 2019-09-04 (3 Comments)
Some Thoughts all but one by Charlie (2019-09-04 09:41:07)
Difficulty: 3 of 5Under Beautiful recursion (in Just Math)
Posted on 2019-09-03 (2 Comments)
Solution computer observation and solution by Charlie (2019-09-03 11:14:16)
Difficulty: 5 of 5Under Bored student (in Just Math)
Posted on 2019-08-30 (6 Comments)
Some Thoughts partial solution by Charlie (2019-08-30 13:02:05)
Difficulty: 4 of 5Under Money in the word (in Word Problems)
Posted on 2019-08-29 (2 Comments)
Solution computer solution by Charlie (2019-08-29 14:24:13)
Difficulty: 3 of 5Under Summing the product of digits (in Numbers)
Posted on 2019-08-23 (5 Comments)
Solution revised solution by Charlie (2019-08-23 12:18:08)
re: solution -- I forgot about something by Charlie (2019-08-23 11:11:35)
Some Thoughts solution by Charlie (2019-08-23 10:54:18)
Difficulty: 4 of 5Under Rotated Checkerboard (in Just Math)
Posted on 2019-08-22 (3 Comments)
Solution No Subject by Charlie (2019-08-22 11:24:22)
Difficulty: 3 of 5Under A Triangle in a Square (in Geometry)
Posted on 2019-08-21 (7 Comments)
Solution Wolfram Alpha exact solution via 5 equations by Charlie (2019-08-21 12:25:00)
Solution Geometer's Sketchpad approximation by Charlie (2019-08-21 10:18:54)
Difficulty: 3 of 5Under Yahtzee (in Probability)
Posted on 2019-08-20 (2 Comments)
Solution computer-aided solution by Charlie (2019-08-20 12:22:45)
Difficulty: 2 of 5Under Irrational Distance/Rational Areas (in Just Math)
Posted on 2019-08-19 (4 Comments)
Solution solution by Charlie (2019-08-19 12:44:02)
Difficulty: 4 of 5Under Recursive reaches one million (in Numbers)
Posted on 2019-08-15 (5 Comments)
re: computer solution with pattern the rest of the output by Charlie (2019-08-15 13:27:31)
Solution computer solution with pattern by Charlie (2019-08-15 09:18:37)
Difficulty: 3 of 5Under Digitally Average Integers (in Numbers)
Posted on 2019-08-14 (2 Comments)
Solution computer solution by Charlie (2019-08-14 09:41:12)
Difficulty: 3 of 5Under Peoples Day (in Just Math)
Posted on 2019-08-12 (3 Comments)
Solution computer-aided solution by Charlie (2019-08-12 22:46:02)
Difficulty: 4 of 5Under Getting 8 (in Numbers)
Posted on 2019-08-11 (42 Comments)
Solution computer solution by Charlie (2019-08-11 12:28:47)
Difficulty: 3 of 5Under Squared average equals square (in Numbers)
Posted on 2019-08-09 (3 Comments)
Solution computer solution by Charlie (2019-08-09 12:59:34)
Difficulty: 3 of 5Under Unique letters (in Word Problems)
Posted on 2019-08-08 (1 Comments)
Solution computer solution (spoiler) by Charlie (2019-08-08 10:31:11)
Difficulty: 3 of 5Under A Mysterious Multiplication (in Numbers)
Posted on 2019-08-07 (4 Comments)
re: No Subject by Charlie (2019-08-09 13:07:43)
Solution computer solution by Charlie (2019-08-07 09:43:28)
Difficulty: 3 of 5Under One or more? (in Word Problems)
Posted on 2019-08-06 (2 Comments)
Solution computer solution by Charlie (2019-08-06 11:54:37)
Difficulty: 2 of 5Under points or pigeons in square? (in Just Math)
Posted on 2019-08-05 (8 Comments)
re(2): what? by Charlie (2019-08-05 21:27:17)
what? by Charlie (2019-08-05 18:31:13)
Difficulty: 3 of 5Under Digital computing (in Numbers)
Posted on 2019-08-03 (25 Comments)
Solution computer solution--I think what's wanted by Charlie (2019-08-03 13:01:15)
Difficulty: 3 of 5Under 444...444 (in Numbers)
Posted on 2019-08-02 (6 Comments)
re: solution by Charlie (2019-08-02 13:37:55)
Solution computer solution by Charlie (2019-08-02 13:36:38)
Difficulty: 2 of 5Under Gifts exchanged (in Logic)
Posted on 2019-07-29 (3 Comments)
Solution solution by Charlie (2019-07-29 10:50:08)
Difficulty: 3 of 5Under Rods as triangle sides (in Just Math)
Posted on 2019-07-28 (1 Comments)
Solution No Subject by Charlie (2019-07-28 14:41:04)
Difficulty: 4 of 5Under Pairs of primes (in Probability)
Posted on 2019-07-27 (10 Comments)
An extension by Charlie (2019-07-31 10:50:14)
re: via computer - the start of the soln by Charlie (2019-07-28 07:58:12)
re(2): computer solution through n=6 list continued by Charlie (2019-07-27 22:01:14)
re: computer solution through n=6 list continued by Charlie (2019-07-27 22:00:18)
Solution computer solution through n=6 by Charlie (2019-07-27 21:57:42)
Difficulty: 4 of 5Under 15 A2A (in Word Problems)
Posted on 2019-07-26 (4 Comments)
Some Thoughts a start by Charlie (2019-07-26 07:40:00)
Difficulty: 3 of 5Under Bugs on a pentagon (in Just Math)
Posted on 2019-07-24 (2 Comments)
Solution proposed solution by Charlie (2019-07-24 12:28:08)
Difficulty: 2 of 5Under Conversion Diversion (in Just Math)
Posted on 2019-07-23 (2 Comments)
Solution solution by Charlie (2019-07-23 13:06:16)
Difficulty: 3 of 5Under How do I know the time? (in Just Math)
Posted on 2019-07-20 (1 Comments)
Solution algebraic analysis and computer solution by Charlie (2019-07-20 12:38:54)
Difficulty: 3 of 5Under Keep an eye Onto the other (in Just Math)
Posted on 2019-07-19 (4 Comments)
re: solution by Charlie (2019-07-19 10:19:47)
Difficulty: 3 of 5Under Approximate value (in Numbers)
Posted on 2019-07-17 (3 Comments)
Solution answers by Charlie (2019-07-17 15:46:34)
Difficulty: 2 of 5Under Quick integral (in Calculus)
Posted on 2019-07-16 (3 Comments)
Solution solution by Charlie (2019-07-16 10:14:01)
Difficulty: 3 of 5Under Describe the decimal (in Numbers)
Posted on 2019-07-12 (4 Comments)
Solution computer-aided solution by Charlie (2019-07-12 12:09:54)
Difficulty: 3 of 5Under Trying to get better (in Just Math)
Posted on 2019-07-11 (4 Comments)
Solution re(2): hmmmm... Try again - there are numerous solutions... by Charlie (2019-07-11 17:21:46)
Some Thoughts hmmmm... by Charlie (2019-07-11 13:41:46)
Difficulty: 2 of 5Under 249-yes, 5-no (in Numbers)
Posted on 2019-07-08 (2 Comments)
Solution solution by Charlie (2019-07-08 14:39:41)
Difficulty: 4 of 5Under Hexagonally closer (in Just Math)
Posted on 2019-07-07 (5 Comments)
Some Thoughts A start by Charlie (2019-07-07 09:57:04)
Difficulty: 3 of 5Under Square and Rectangle (in Geometry)
Posted on 2019-07-04 (3 Comments)
Solution GSP solution by Charlie (2019-07-04 14:37:07)
Difficulty: 2 of 5Under A special triplet (in Numbers)
Posted on 2019-07-02 (3 Comments)
Solution solution by Charlie (2019-07-03 03:59:31)
Difficulty: 3 of 5Under Synonyms (in Word Problems)
Posted on 2019-07-01 (5 Comments)
Solution computer-aided solution by Charlie (2019-07-01 09:25:09)
Difficulty: 3 of 5Under Quick factors III (in Numbers)
Posted on 2019-06-27 (3 Comments)
Solution solution by Charlie (2019-06-27 15:39:24)
Difficulty: 2 of 5Under Cryptajoke XIX (in Word Problems)
Posted on 2019-06-18 (1 Comments)
Solution solution by Charlie (2019-06-18 22:27:13)
Difficulty: 3 of 5Under A four number puzzle (in Just Math)
Posted on 2019-06-15 (5 Comments)
re(2): proposed solution -- higher value by Charlie (2019-06-16 21:33:26)
Difficulty: 3 of 5Under Just Hangin' around (in Just Math)
Posted on 2019-06-14 (10 Comments)
re: method .... by Charlie (2019-06-14 22:17:12)
Some Thoughts just a thought by Charlie (2019-06-14 11:15:50)
Difficulty: 2 of 5Under Primes and Semiprimes (in Numbers)
Posted on 2019-06-12 (2 Comments)
Solution computer solution by Charlie (2019-06-12 12:12:48)
Difficulty: 3 of 5Under Pouring water (in Shapes)
Posted on 2019-06-06 (2 Comments)
Solution solution by Charlie (2019-06-06 15:54:26)
Difficulty: 4 of 5Under Number dilemma (in Numbers)
Posted on 2019-06-05 (19 Comments)
Solution computer solution by Charlie (2019-06-05 12:29:13)
Difficulty: 3 of 5Under Tangent of string of 5 (in Just Math)
Posted on 2019-06-04 (3 Comments)
re: Again, quite interesting by Charlie (2019-06-05 12:23:35)
Difficulty: 2 of 5Under Oned square root (in Numbers)
Posted on 2019-06-03 (4 Comments)
Some Thoughts thoughts by Charlie (2019-06-03 22:02:55)
Difficulty: 3 of 5Under Sliced sphere (in Shapes)
Posted on 2019-05-29 (5 Comments)
re: attempted soln by Charlie (2019-05-30 10:52:58)
Difficulty: 3 of 5Under Who's on the 4th base? (in Numbers)
Posted on 2019-05-28 (3 Comments)
re: computer solution and extension continued by Charlie (2019-05-28 15:53:51)
Solution computer solution and extension by Charlie (2019-05-28 15:51:13)
Difficulty: 2 of 5Under Divisors' sum = square (in Numbers)
Posted on 2019-05-27 (9 Comments)
Solution computer solution by Charlie (2019-05-27 15:54:32)
Difficulty: 3 of 5Under The Bug Climber (in Just Math)
Posted on 2019-05-22 (2 Comments)
Some Thoughts re: solution by Charlie (2019-05-23 10:38:23)
Solution solution by Charlie (2019-05-22 20:12:38)
Difficulty: 3 of 5Under Soft car for cats (in Numbers)
Posted on 2019-05-22 (2 Comments)
Some Thoughts partway, I think by Charlie (2019-05-22 12:29:57)
Difficulty: 3 of 5Under Squarely chained (in Numbers)
Posted on 2019-05-21 (3 Comments)
Solution computer solution by Charlie (2019-05-21 16:17:35)
Difficulty: 3 of 5Under Carry on, Decimal (in Numbers)
Posted on 2019-05-20 (3 Comments)
Solution solution by Charlie (2019-05-20 19:24:02)
Difficulty: 4 of 5Under Evened N and 3N (in Numbers)
Posted on 2019-05-18 (2 Comments)
Solution computer solution by Charlie (2019-05-18 14:07:48)
Difficulty: 3 of 5Under Calculator can't handle it (in Numbers)
Posted on 2019-05-17 (3 Comments)
Solution solution by Charlie (2019-05-17 19:25:55)
Difficulty: 3 of 5Under Marks on Marks off (in Numbers)
Posted on 2019-05-15 (3 Comments)
Solution solution by Charlie (2019-05-15 16:56:55)
Difficulty: 3 of 5Under Concatenation sum (in Numbers)
Posted on 2019-05-15 (4 Comments)
Solution computer-aided solution by Charlie (2019-05-15 11:23:30)
Difficulty: 3 of 5Under Prime wisdom (in Logic)
Posted on 2019-05-14 (3 Comments)
Solution Errare humanum est, Ady's in good company. A propos indeed. by Charlie (2019-05-16 10:31:51)
Some Thoughts a computer beginning by Charlie (2019-05-14 14:46:42)
Difficulty: 2 of 5Under The road less travelled (in Just Math)
Posted on 2019-05-14 (1 Comments)
Solution solution by Charlie (2019-05-14 11:42:43)
Difficulty: 1 of 5Under Chemical deduction (in Logic)
Posted on 2019-05-13 (10 Comments)
Solution solution by Charlie (2019-05-13 12:45:21)
Difficulty: 4 of 5Under Precision counts! (in Sequences)
Posted on 2019-05-12 (4 Comments)
re: 1st attempt - not complete by Charlie (2019-05-12 09:27:24)
Difficulty: 2 of 5Under No copying, students (in Probability)
Posted on 2019-05-10 (2 Comments)
Solution computer-aided solution by Charlie (2019-05-10 14:15:08)
Difficulty: 3 of 5Under Integer coordinates (in Numbers)
Posted on 2019-05-09 (2 Comments)
Solution solution by Charlie (2019-05-09 14:18:54)
Difficulty: 3 of 5Under Odd partition (in Numbers)
Posted on 2019-05-09 (2 Comments)
Solution computer solution by Charlie (2019-05-09 14:13:14)
Difficulty: 3 of 5Under A hairy problem (in Just Math)
Posted on 2019-05-08 (1 Comments)
Solution computer solution with assumptions by Charlie (2019-05-08 17:22:51)
Difficulty: 3 of 5Under Summed LCM (in Numbers)
Posted on 2019-05-08 (3 Comments)
Solution solution by Charlie (2019-05-08 10:53:48)
Difficulty: 3 of 5Under A geometric gangster shooting (in Just Math)
Posted on 2019-05-06 (6 Comments)
re(2): A guess (spoiler?) by Charlie (2019-05-06 18:21:38)
re(2): A guess (spoiler?) by Charlie (2019-05-06 17:01:42)
Difficulty: 4 of 5Under Diagonal mystery (in Geometry)
Posted on 2019-05-04 (3 Comments)
Solution computer solution by Charlie (2019-05-04 13:53:04)
Difficulty: 3 of 5Under Single, Double & Triple Scoops (in Just Math)
Posted on 2019-05-03 (1 Comments)
Solution solution two ways by Charlie (2019-05-03 09:06:09)
Difficulty: 3 of 5Under Number Cards Before Face Cards (in Probability)
Posted on 2019-05-02 (6 Comments)
Hints/Tips Hint by Charlie (2019-05-06 07:51:34)
Difficulty: 2 of 5Under The right time (in Just Math)
Posted on 2019-05-02 (1 Comments)
Solution solution by Charlie (2019-05-06 11:33:25)
Difficulty: 3 of 5Under The powers and the exponent (in Calculus)
Posted on 2019-05-01 (1 Comments)
Solution solution by Charlie (2019-05-01 18:24:26)
Difficulty: 1 of 5Under Missing letter (in Logic)
Posted on 2019-05-01 (6 Comments)
re: almost (w/spoiler) by Charlie (2019-05-01 11:11:51)
Difficulty: 1 of 5Under The special ones among the group (in Numbers)
Posted on 2019-04-30 (3 Comments)
Solution solution by Charlie (2019-04-30 12:29:11)
Difficulty: 4 of 5Under Bit filling in 5*5 grid! (in Just Math)
Posted on 2019-04-26 (3 Comments)
Solution computer solution by Charlie (2019-04-26 12:39:15)
Difficulty: 3 of 5Under Arithmetic prime (in Numbers)
Posted on 2019-04-25 (3 Comments)
Solution computer solution by Charlie (2019-04-25 14:50:25)
Difficulty: 3 of 5Under He stole my ball! (in Probability)
Posted on 2019-04-24 (8 Comments)
re(2): computer assissted solution by Charlie (2019-04-25 15:30:08)
re: related problem by Charlie (2019-04-25 14:26:53)
Solution computer assissted solution by Charlie (2019-04-24 16:44:02)
Difficulty: 2 of 5Under How many qualified numbers? (in Numbers)
Posted on 2019-04-24 (3 Comments)
Solution solution by Charlie (2019-04-24 11:57:48)
Difficulty: 2 of 5Under A Jewish dilemma (in Word Problems)
Posted on 2019-04-19 (1 Comments)
Solution solution by Charlie (2019-04-19 12:29:03)
Difficulty: 4 of 5Under Breaking the Jewel code (in Numbers)
Posted on 2019-04-17 (4 Comments)
Some Thoughts some thoughts by Charlie (2019-04-17 11:03:51)
Difficulty: 3 of 5Under 2000 9s (in Numbers)
Posted on 2019-04-15 (2 Comments)
Solution solution by Charlie (2019-04-15 19:47:46)
Difficulty: 3 of 5Under 4 and 5 powered (in Numbers)
Posted on 2019-04-12 (2 Comments)
Solution computer solution by Charlie (2019-04-12 13:24:58)
Difficulty: 3 of 5Under The number n in n^2 (in Numbers)
Posted on 2019-04-11 (3 Comments)
in Basic by Charlie (2019-04-11 15:27:08)
Difficulty: 3 of 5Under Blobs' Borders 2 (in Shapes)
Posted on 2019-04-10 (4 Comments)
re(2): solution -- another way (attempt) by Charlie (2019-04-16 11:41:08)
re: solution by Charlie (2019-04-16 11:35:48)
Difficulty: 3 of 5Under Based on threes! (in Numbers)
Posted on 2019-04-09 (5 Comments)
Solution solution with computation by program, with a one-paragraph analytic method by Charlie (2019-04-09 16:03:12)
Difficulty: 2 of 5Under Just count them ! (in Just Math)
Posted on 2019-04-09 (2 Comments)
Solution computer solution by Charlie (2019-04-09 10:55:30)
Difficulty: 3 of 5Under Matrixed Fibonacci (in Just Math)
Posted on 2019-04-08 (2 Comments)
Solution answer (computer exploration) by Charlie (2019-04-08 16:41:42)
Difficulty: 5 of 5Under The devilish 9 roots (in Just Math)
Posted on 2019-04-06 (1 Comments)
Solution Wolfram Alpha's solution by Charlie (2019-04-06 14:25:27)
Difficulty: 3 of 5Under Imagine the world (in Shapes)
Posted on 2019-04-05 (2 Comments)
Solution delayed aha! moment after too much algebra by Charlie (2019-04-05 18:06:57)
Difficulty: 3 of 5Under Hot and Cold Cubes (in Science)
Posted on 2019-04-04 (6 Comments)
re(2): Missing info? Or solution? Example by Charlie (2019-04-05 11:18:22)
Difficulty: 2 of 5Under Asymmetrical String (in Numbers)
Posted on 2019-04-04 (1 Comments)
Solution solution by Charlie (2019-04-04 10:58:06)
Difficulty: 3 of 5Under Hy-Spherical (in Shapes)
Posted on 2019-04-03 (1 Comments)
Solution if my algebra was careful enough... by Charlie (2019-04-03 23:18:59)
Difficulty: 3 of 5Under Sine in Exponent (in Just Math)
Posted on 2019-04-03 (17 Comments)
Solution re: 2 possible solutions by Charlie (2019-04-03 13:52:27)
Difficulty: 3 of 5Under Taramasalata inspired world (in Word Problems)
Posted on 2019-04-01 (21 Comments)
Solution correcting my error and summing up by Charlie (2019-04-18 20:21:48)
apologies by Charlie (2019-04-18 15:40:22)
more mountains by Charlie (2019-04-18 15:27:35)
mountains by Charlie (2019-04-18 14:00:35)
countries by Charlie (2019-04-18 11:02:37)
re(2): Some cities and states were missed by Charlie (2019-04-18 10:49:14)
re: Some cities and states were missed by Charlie (2019-04-17 21:19:53)
Some cities and states were missed by Charlie (2019-04-17 20:50:11)
Some Thoughts World cities and U.S. states -- same idea -- from Wikipedia pages by Charlie (2019-04-17 20:33:34)
Some Thoughts Rivers in the U.S. -- computer findings by Charlie (2019-04-17 15:03:53)
Difficulty: 3 of 5Under Closer to your roots (in Just Math)
Posted on 2019-03-28 (1 Comments)
Solution from Wolfram Alpha by Charlie (2019-03-28 17:15:38)
Difficulty: 3 of 5Under A Divisor Diversion (in Numbers)
Posted on 2019-03-27 (5 Comments)
Some Thoughts computer exploration--probable solution by Charlie (2019-03-27 17:22:04)
Difficulty: 3 of 5Under Divisor in between (in Numbers)
Posted on 2019-03-26 (2 Comments)
Solution solution by Charlie (2019-03-26 13:38:09)
Difficulty: 2 of 5Under Larger Square (in Numbers)
Posted on 2019-03-25 (2 Comments)
Solution computer solution by Charlie (2019-03-25 12:46:21)
Difficulty: 3 of 5Under Sick-quence (in Just Math)
Posted on 2019-03-20 (1 Comments)
Solution computer solution by Charlie (2019-03-20 11:13:28)
Difficulty: 3 of 5Under Math is radical (in Numbers)
Posted on 2019-03-19 (3 Comments)
Some Thoughts computer attempt is close but no cigar by Charlie (2019-03-19 15:00:51)
Difficulty: 3 of 5Under Factor it (in Numbers)
Posted on 2019-03-19 (4 Comments)
re: Solution .... hmmm by Charlie (2019-03-19 11:37:55)
Difficulty: 3 of 5Under Is this circular billiards? (in Geometry)
Posted on 2019-03-18 (4 Comments)
re(2): Geometer's Sketchpad approximation by Charlie (2019-03-18 19:49:15)
Some Thoughts Geometer's Sketchpad approximation by Charlie (2019-03-18 17:09:09)
Difficulty: 2 of 5Under Weird equations (in Just Math)
Posted on 2019-03-18 (2 Comments)
Solution Wolfram Alpha's solution by Charlie (2019-03-18 12:41:51)
Difficulty: 3 of 5Under Quad composition (in Just Math)
Posted on 2019-03-16 (4 Comments)
re(2): calculator solution by Charlie (2019-03-16 14:19:55)
re: calculator solution by Charlie (2019-03-16 13:32:54)
Solution calculator solution by Charlie (2019-03-16 13:20:33)
Difficulty: 4 of 5Under The Tiny Triangle (in Shapes)
Posted on 2019-03-15 (2 Comments)
Some Thoughts Geometer's Sketchpad approximation by Charlie (2019-03-15 17:30:47)
Difficulty: 3 of 5Under Where is the center? (in Geometry)
Posted on 2019-03-15 (13 Comments)
Some Thoughts How my method must have gone wrong by Charlie (2019-03-15 13:03:51)
Difficulty: 3 of 5Under 'Two' many roots (in Just Math)
Posted on 2019-03-14 (2 Comments)
Solution solution by Charlie (2019-03-14 15:54:56)
Difficulty: 3 of 5Under Shifting the digit II (in Numbers)
Posted on 2019-03-13 (2 Comments)
Solution computer-aided solution by Charlie (2019-03-13 13:30:43)
Difficulty: 4 of 5Under A Golden Fraction (in Numbers)
Posted on 2019-03-12 (3 Comments)
Solution UBASIC solution (spoiler) by Charlie (2019-03-12 15:51:27)
Difficulty: 3 of 5Under Shifting the digit (in Numbers)
Posted on 2019-03-11 (5 Comments)
Solution computer solution by Charlie (2019-03-11 17:42:32)
Difficulty: 3 of 5Under Minimizing the Denominator (in Numbers)
Posted on 2019-03-08 (3 Comments)
Solution computer solution by Charlie (2019-03-08 16:19:45)
Difficulty: 4 of 5Under Corruption in my file (in Probability)
Posted on 2019-03-07 (1 Comments)
Solution solution by Charlie (2019-03-07 13:08:51)
Difficulty: 3 of 5Under What's the calculator doing? (in General)
Posted on 2019-03-06 (4 Comments)
Solution solution by Charlie (2019-03-06 15:26:51)
Difficulty: 2 of 5Under A Great Greatest Common Divisor (in Numbers)
Posted on 2019-03-06 (2 Comments)
Solution solution by Charlie (2019-03-06 10:46:15)
Difficulty: 3 of 5Under The Great Comparison (in Numbers)
Posted on 2019-03-02 (6 Comments)
Solution the answer by Charlie (2019-03-02 15:52:04)
Difficulty: 3 of 5Under 2018 to 2019 (in Numbers)
Posted on 2019-03-01 (3 Comments)
Solution solution by Charlie (2019-03-01 13:33:13)
Difficulty: 3 of 5Under And counting (in Numbers)
Posted on 2019-02-28 (4 Comments)
Solution Wolfram Alpha's solution by Charlie (2019-02-28 19:43:36)
Difficulty: 3 of 5Under Odd one out (in Word Problems)
Posted on 2019-02-28 (2 Comments)
Solution solution by Charlie (2019-02-28 15:16:29)
Difficulty: 2 of 5Under Shifted regions (in Just Math)
Posted on 2019-02-27 (4 Comments)
re: solution - math and computer by Charlie (2019-02-28 15:33:07)
Solution solution by Charlie (2019-02-27 15:09:30)
Difficulty: 3 of 5Under Add no DANDY - No need ! (in Word Problems)
Posted on 2019-02-25 (1 Comments)
Some Thoughts words from my computer's word list (spoiler) by Charlie (2019-02-25 14:58:33)
Difficulty: 1 of 5Under Counting Digit (in Numbers)
Posted on 2019-02-25 (3 Comments)
Solution how long does this method work? (spoiler) by Charlie (2019-02-25 11:50:29)
Difficulty: 3 of 5Under Palindromes' divisibility (in Numbers)
Posted on 2019-02-22 (2 Comments)
re: Mentally by Charlie (2019-02-26 09:38:22)
Difficulty: 2 of 5Under Unlikely event (in Numbers)
Posted on 2019-02-21 (3 Comments)
Solution solution by Charlie (2019-02-21 11:37:43)
Difficulty: 2 of 5Under Twin and reversible (in Numbers)
Posted on 2019-02-20 (5 Comments)
Solution solution and extension by Charlie (2019-02-20 13:06:07)
Difficulty: 2 of 5Under Limited reflections (in General)
Posted on 2019-02-19 (7 Comments)
re(2): There are easy ways by Charlie (2019-02-21 13:43:04)
Solution simulation by Charlie (2019-02-20 12:00:19)
Solution Much work for a D2 puzzle by Charlie (2019-02-19 16:29:56)
Difficulty: 2 of 5Under Bifonacci (in Numbers)
Posted on 2019-02-19 (2 Comments)
re: Solution; also an extension by Charlie (2019-02-19 11:06:49)
Difficulty: 3 of 5Under Chacun à son goût ! (in Just Math)
Posted on 2019-02-18 (3 Comments)
re(2): computer solutions, with an extension of the bonus by Charlie (2019-02-19 11:19:31)
Solution computer solutions, with an extension of the bonus by Charlie (2019-02-18 16:43:31)
Difficulty: 3 of 5Under Algebra? (in Just Math)
Posted on 2019-02-16 (1 Comments)
Solution via Wolfram Alpha by Charlie (2019-02-16 15:11:11)
Difficulty: 3 of 5Under Recovering the number (in Numbers)
Posted on 2019-02-13 (2 Comments)
bonus by Charlie (2019-02-13 13:43:15)
Difficulty: 3 of 5Under The Cut Cube (in Shapes)
Posted on 2019-02-13 (4 Comments)
Solution solution by Charlie (2019-02-13 12:25:24)
Difficulty: 3 of 5Under Can you C it? (in Word Problems)
Posted on 2019-02-06 (21 Comments)
Some Thoughts if... by Charlie (2019-02-06 12:22:21)
Difficulty: 3 of 5Under 3 coprime unknowns (in Numbers)
Posted on 2019-02-04 (2 Comments)
Solution computer solution by Charlie (2019-02-04 11:55:20)
Difficulty: 3 of 5Under Integers inside surds (in Numbers)
Posted on 2019-02-03 (2 Comments)
Solution computer doesn't mind tedium, and discovers duplicates by Charlie (2019-02-06 12:56:35)
Difficulty: 3 of 5Under Neighbors differ by even numbers (in Numbers)
Posted on 2019-02-01 (2 Comments)
Solution computer-aided solution by Charlie (2019-02-01 16:26:57)
Difficulty: 3 of 5Under OMG Equation (in Just Math)
Posted on 2019-02-01 (1 Comments)
Solution Wolfram Alpha's solution by Charlie (2019-02-01 13:23:48)
Difficulty: 3 of 5Under Only prime digits allowed (in Numbers)
Posted on 2019-01-31 (2 Comments)
Solution computer solution by Charlie (2019-01-31 15:57:31)
Difficulty: 3 of 5Under 48th digit in the head (in Just Math)
Posted on 2019-01-30 (4 Comments)
Some Thoughts certainly not in my head (but spoiler present anyway) by Charlie (2019-01-30 15:02:06)
Difficulty: 2 of 5Under Consistency parameter (in Just Math)
Posted on 2019-01-30 (3 Comments)
Solution solution by Charlie (2019-01-30 11:38:01)
Difficulty: 3 of 5Under An enumeration problem (in Just Math)
Posted on 2019-01-28 (1 Comments)
Solution Let me enumerate the ways -- computer solution by Charlie (2019-01-28 15:58:38)
Difficulty: 3 of 5Under Digit Hunting (in Just Math)
Posted on 2019-01-26 (4 Comments)
Solution by computer calculation by Charlie (2019-01-26 15:09:29)
Difficulty: 2 of 5Under Uniform distribution (in Probability)
Posted on 2019-01-25 (9 Comments)
re: computer solution by Charlie (2019-01-26 16:22:06)
Solution computer solution by Charlie (2019-01-26 15:47:54)
Difficulty: 3 of 5Under More or less 6 days (in Just Math)
Posted on 2019-01-24 (6 Comments)
re(2): computer solution--all ways by Charlie (2019-01-25 12:53:28)
Solution computer solution--all ways by Charlie (2019-01-25 09:08:22)
Difficulty: 4 of 5Under Digit Anagram (in Numbers)
Posted on 2019-01-24 (3 Comments)
Some Thoughts some examples--for what they're worth by Charlie (2019-01-24 10:27:13)
Difficulty: 4 of 5Under Smooth Sum Situation (in Sequences)
Posted on 2019-01-23 (3 Comments)
Some Thoughts computer sum; dumb way and smarter way by Charlie (2019-01-23 15:42:55)
Difficulty: 3 of 5Under Worm ate the numbers (in Numbers)
Posted on 2019-01-18 (2 Comments)
Solution computer solution by Charlie (2019-01-19 13:36:45)
Difficulty: 3 of 5Under Factorial Tremors (in Numbers)
Posted on 2019-01-16 (5 Comments)
re: Guess by Charlie (2019-01-16 15:20:02)
Difficulty: 3 of 5Under Dial W for WORD (in Word Problems)
Posted on 2019-01-15 (1 Comments)
Solution No Subject by Charlie (2019-01-15 15:55:46)
Difficulty: 3 of 5Under Reach home (in Just Math)
Posted on 2019-01-14 (13 Comments)
Some Thoughts conjecture by Charlie (2019-01-14 16:26:06)
Difficulty: 3 of 5Under Sine recurrence (in Just Math)
Posted on 2019-01-08 (6 Comments)
Solution computer solution by Charlie (2019-01-08 11:22:15)
re: @ DAK by Charlie (2019-01-08 08:20:15)
Difficulty: 3 of 5Under Defining a number (in Numbers)
Posted on 2019-01-05 (2 Comments)
Solution computer solutions by Charlie (2019-01-05 13:47:53)
Difficulty: 3 of 5Under 4 or more primes (in Numbers)
Posted on 2019-01-03 (3 Comments)
Solution computer solution by Charlie (2019-01-03 12:42:41)
Difficulty: 3 of 5Under Ring in the New - again and again and again.. (in Numbers)
Posted on 2019-01-01 (2 Comments)
Some Thoughts playing with the computer in UBASIC by Charlie (2019-01-01 14:53:34)
Difficulty: 3 of 5Under 24 pre-scheduled dates (in Just Math)
Posted on 2018-12-31 (1 Comments)
Solution computer-aided solution by Charlie (2018-12-31 22:42:41)
Difficulty: 3 of 5Under Double perfection (in Numbers)
Posted on 2018-12-28 (1 Comments)
Solution computer solution by Charlie (2018-12-28 15:26:08)
Difficulty: 5 of 5Under Restoring a multiplication sample (in Just Math)
Posted on 2018-12-27 (1 Comments)
Solution computer solutions by Charlie (2018-12-27 11:12:58)
Difficulty: 3 of 5Under Same digits (in Numbers)
Posted on 2018-12-26 (6 Comments)
re(2): computer solution by Charlie (2018-12-26 20:02:17)
Solution computer solution by Charlie (2018-12-26 10:24:13)
Difficulty: 4 of 5Under Probably Acute (in Just Math)
Posted on 2018-12-21 (12 Comments)
re: simulation results by Charlie (2018-12-25 13:18:12)
re: Not one answer by Charlie (2018-12-22 08:34:36)
Some Thoughts simulation results by Charlie (2018-12-21 10:58:56)
Difficulty: 4 of 5Under Restoring a definition (in Word Problems)
Posted on 2018-12-19 (2 Comments)
Some Thoughts approximate solution -- researched by Charlie (2018-12-19 16:03:46)
Difficulty: 4 of 5Under Concentric Circles and Equilateral Triangle (in Just Math)
Posted on 2018-12-15 (2 Comments)
Some Thoughts GSP Approximation by Charlie (2018-12-15 15:51:06)
Difficulty: 4 of 5Under Colored triangle (in Sequences)
Posted on 2018-12-14 (10 Comments)
Some Thoughts in case this helps guide the analysis by Charlie (2018-12-14 21:26:20)
Difficulty: 2 of 5Under All digits distinct (in Numbers)
Posted on 2018-12-12 (5 Comments)
re: late computer solution by Charlie (2020-12-12 16:11:41)
Solution computer solution by Charlie (2018-12-12 15:15:17)
Difficulty: 2 of 5Under A short list (in Numbers)
Posted on 2018-12-11 (2 Comments)
Solution computer solution by Charlie (2018-12-11 11:08:27)
Difficulty: 4 of 5Under The 100th number (in Sequences)
Posted on 2018-12-10 (9 Comments)
re(3): Hint by Charlie (2019-01-11 11:44:45)
Difficulty: 4 of 5Under Maximal number of solutions (in Just Math)
Posted on 2018-12-08 (5 Comments)
Solution Basic language solution by Charlie (2018-12-09 10:13:45)
Difficulty: 3 of 5Under 8 distinct partitions (in Numbers)
Posted on 2018-12-06 (6 Comments)
re(2): computer solution by Charlie (2018-12-07 07:23:18)
Solution computer solution by Charlie (2018-12-06 22:40:19)
Difficulty: 3 of 5Under Square after square creates a new square (in Numbers)
Posted on 2018-12-05 (3 Comments)
Some Thoughts supplement containing non-trivializing zeros by Charlie (2018-12-05 10:56:08)
Solution computer solution by Charlie (2018-12-05 10:28:31)
Difficulty: 4 of 5Under Evaluate the sum (in Sequences)
Posted on 2018-12-01 (5 Comments)
Solution solution based on previous comments by Charlie (2018-12-02 14:05:51)
Difficulty: 2 of 5Under Mean Diagonals (in Calculus)
Posted on 2018-11-23 (5 Comments)
Some Thoughts one probably wrong way to go about it by Charlie (2018-11-23 11:42:02)
Difficulty: 2 of 5Under From sum to addends (in Just Math)
Posted on 2018-11-22 (3 Comments)
Solution answer by Charlie (2018-11-23 11:23:55)
Difficulty: 3 of 5Under 3 equal products (in Numbers)
Posted on 2018-11-21 (10 Comments)
re(2): Answer to the bonus. by Charlie (2018-11-24 09:18:48)
re(3): Answer to the bonus. by Charlie (2018-11-23 11:26:49)
re(2): Answer to the bonus. by Charlie (2018-11-22 18:42:00)
re(2): Answer to the bonus. by Charlie (2018-11-22 15:07:47)
Answer to the bonus. by Charlie (2018-11-21 13:57:27)
re(2): computer solution and partial investigation of the bonus - ctd. by Charlie (2018-11-21 12:14:33)
re: computer solution and partial investigation of the bonus - ctd. by Charlie (2018-11-21 12:12:29)
Solution computer solution and partial investigation of the bonus by Charlie (2018-11-21 12:10:34)
Difficulty: 4 of 5Under New word from two others (in Word Problems)
Posted on 2018-11-18 (9 Comments)
Some Thoughts computer failure to find solution by Charlie (2018-11-18 11:45:06)
Difficulty: 3 of 5Under Sine of Squared (in Calculus)
Posted on 2018-11-15 (6 Comments)
re: computer solution by Charlie (2018-11-15 11:35:32)
Solution computer solution by Charlie (2018-11-15 11:17:41)
Difficulty: 2 of 5Under Body parts (in Riddles)
Posted on 2018-11-06 (8 Comments)
Some Thoughts what I was thinking by Charlie (2018-11-06 13:32:34)
Difficulty: 1 of 5Under Sum of the page numbers (in Just Math)
Posted on 2018-11-05 (3 Comments)
re: Not so simple (spoiler) by Charlie (2018-11-05 10:24:28)
Difficulty: 3 of 5Under Duelling pairs (in Games)
Posted on 2018-11-02 (16 Comments)
Solution computer-aided solution by Charlie (2018-11-02 15:17:15)
Some Thoughts starting up by Charlie (2018-11-02 13:08:37)
Difficulty: 3 of 5Under Defining a sequence (in Just Math)
Posted on 2018-10-31 (3 Comments)
Some Thoughts re: one soln by Charlie (2018-10-31 10:20:18)
Difficulty: 3 of 5Under One-peak sets (in Just Math)
Posted on 2018-10-30 (4 Comments)
re: not sure I understand by Charlie (2018-10-30 17:47:15)
Difficulty: 2 of 5Under Some slack (in Geometry)
Posted on 2018-10-29 (2 Comments)
Solution my solution by Charlie (2018-10-29 10:26:14)
Difficulty: 4 of 5Under Zeta sine (in Just Math)
Posted on 2018-10-28 (6 Comments)
re(4): Solution (spoiler) by Charlie (2018-10-31 15:01:49)
re(2): Solution (spoiler) by Charlie (2018-10-31 14:07:46)
re(3): Solution (spoiler) by Charlie (2018-10-31 12:10:31)
re(2): Solution (spoiler) by Charlie (2018-10-31 11:56:13)
re: Solution (spoiler) by Charlie (2018-10-31 11:26:41)
Difficulty: 4 of 5Under The wisdom of Windsor (in Word Problems)
Posted on 2018-10-26 (2 Comments)
Some Thoughts via some research by Charlie (2018-10-27 15:59:26)
Difficulty: 3 of 5Under Chain of Primes (in Numbers)
Posted on 2018-10-23 (5 Comments)
re: p&p soln by Charlie (2018-10-24 16:21:53)
Difficulty: 4 of 5Under Squares needing 2 digits only (in Numbers)
Posted on 2018-10-21 (3 Comments)
Solution computer solution by Charlie (2018-10-21 19:41:09)
Difficulty: 3 of 5Under A series of primes equals N (in Numbers)
Posted on 2018-10-19 (2 Comments)
Solution computer solution by Charlie (2018-10-19 11:53:38)
Difficulty: 3 of 5Under Parcelation (in Geometry)
Posted on 2018-10-18 (2 Comments)
Solution solution by Charlie (2018-10-18 12:43:00)
Difficulty: 3 of 5Under Get the bases! (in Just Math)
Posted on 2018-10-17 (5 Comments)
re: computer soln --- my program for it by Charlie (2018-10-17 11:39:24)
Difficulty: 2 of 5Under Box of balls (in Probability)
Posted on 2018-10-16 (6 Comments)
Solution solution by Charlie (2018-10-16 11:33:43)
Difficulty: 2 of 5Under Introducing sphenic numbers (in Numbers)
Posted on 2018-10-14 (3 Comments)
Solution solution by Charlie (2018-10-14 17:35:31)
Difficulty: 2 of 5Under Emirps census (in Sequences)
Posted on 2018-10-12 (2 Comments)
Solution computer-aided solution by Charlie (2018-10-12 12:05:22)
Difficulty: 3 of 5Under Reversal creates average (in Sequences)
Posted on 2018-10-10 (7 Comments)
re(2): computer soln by Charlie (2018-10-11 08:26:11)
re: computer soln by Charlie (2018-10-10 11:37:03)
re: computer soln (agree on solution--spoiler present) by Charlie (2018-10-10 11:08:03)
Difficulty: 2 of 5Under Calling spade a spade (in Numbers)
Posted on 2018-10-07 (1 Comments)
Solution computer solution by Charlie (2018-10-07 11:11:39)
Difficulty: 3 of 5Under Feathers of different colors (in Numbers)
Posted on 2018-10-06 (2 Comments)
Solution computer-assisted solution and extension (spoiler) by Charlie (2018-10-06 11:28:05)
Difficulty: 3 of 5Under 2Z out (in Sequences)
Posted on 2018-10-05 (2 Comments)
Solution solution by Charlie (2018-10-05 14:52:53)
Difficulty: 3 of 5Under At least 3 zeroes (in Sequences)
Posted on 2018-10-03 (5 Comments)
Solution solution by Charlie (2018-10-03 11:58:11)
Difficulty: 3 of 5Under Monty Hall variant (in Probability)
Posted on 2018-09-30 (6 Comments)
Monty Hall by Charlie (2018-09-30 10:04:33)
Solution strategy (spoiler) by Charlie (2018-09-30 09:34:57)
Difficulty: 2 of 5Under Prime phone (in Numbers)
Posted on 2018-09-28 (1 Comments)
Solution computer solution by Charlie (2018-09-28 10:56:13)
Difficulty: 3 of 5Under Any conclusions? (in Logic)
Posted on 2018-09-26 (2 Comments)
a conclusion by Charlie (2018-09-26 10:48:24)
Difficulty: 3 of 5Under True or not (in General)
Posted on 2018-09-25 (6 Comments)
re(2): mostly a discussion by Charlie (2018-09-25 15:57:25)
Solution mostly a discussion by Charlie (2018-09-25 09:48:16)
Difficulty: 2 of 5Under A logical search (in Numbers)
Posted on 2018-09-24 (10 Comments)
Solution non-preferred solution and extension by Charlie (2018-09-24 12:58:00)
Difficulty: 3 of 5Under Jeopardy style (in Just Math)
Posted on 2018-09-23 (2 Comments)
Some Thoughts another correct response by Charlie (2018-09-23 14:35:46)
Difficulty: 2 of 5Under Name the sequence (in Sequences)
Posted on 2018-09-17 (5 Comments)
re: Sequence Name by Charlie (2018-09-17 22:26:19)
Difficulty: 3 of 5Under A packing exercise (in Shapes)
Posted on 2018-09-14 (5 Comments)
Solution solution by Charlie (2018-09-14 15:54:23)
Difficulty: 3 of 5Under Compare them (in Numbers)
Posted on 2018-09-08 (7 Comments)
re(2): integers for (x,y) by Charlie (2018-09-10 07:49:14)
Some Thoughts re: proposed solution by Charlie (2018-09-08 17:15:12)
Solution proposed solution by Charlie (2018-09-08 13:23:42)
Difficulty: 2 of 5Under A Cone and a Sphere (in Just Math)
Posted on 2018-09-07 (6 Comments)
Solution My corrected solution by Charlie (2018-09-08 08:56:08)
re: attempted solution by Charlie (2018-09-07 14:05:47)
Solution solution by Charlie (2018-09-07 13:57:30)
Difficulty: 3 of 5Under Weight of nothing in an elevator (in Science)
Posted on 2018-09-06 (6 Comments)
re: No Subject by Charlie (2018-09-06 15:36:17)
Some Thoughts proposed solution by Charlie (2018-09-06 10:54:35)
Difficulty: 4 of 5Under Around the beast number (in Numbers)
Posted on 2018-09-04 (4 Comments)
re: soln.s by Charlie (2018-09-04 20:11:16)
Difficulty: 2 of 5Under Complicated Tangency (in Geometry)
Posted on 2018-09-01 (2 Comments)
Solution solution by Charlie (2018-09-01 14:37:37)
Difficulty: 3 of 5Under A pet ant (in Shapes)
Posted on 2018-08-31 (3 Comments)
Solution solution by Charlie (2018-08-31 13:47:28)
Difficulty: 2 of 5Under Ignoring an error (in Just Math)
Posted on 2018-08-30 (2 Comments)
Solution solution by Charlie (2018-08-30 14:31:32)
Difficulty: 3 of 5Under Power tower (in Numbers)
Posted on 2018-08-26 (1 Comments)
Solution solution by Charlie (2018-08-26 13:39:29)
Difficulty: 2 of 5Under A set of numbers (in Numbers)
Posted on 2018-08-25 (1 Comments)
Solution solution by Charlie (2018-08-25 15:45:55)
Difficulty: 5 of 5Under Ant highway with energy loss (in Calculus)
Posted on 2018-08-24 (9 Comments)
re: possible analytical approach (thoughts) by Charlie (2018-08-26 12:49:47)
re(3): heuristic computer solution by Charlie (2018-08-26 12:44:59)
re(2): heuristic computer solution by Charlie (2018-08-25 12:07:58)
Solution heuristic computer solution by Charlie (2018-08-24 18:42:13)
Difficulty: 3 of 5Under A counting task (in Numbers)
Posted on 2018-08-23 (7 Comments)
re: counting by Charlie (2018-08-23 10:39:44)
the numbers by Charlie (2018-08-23 10:01:30)
Solution computer solution by Charlie (2018-08-23 10:00:05)
Difficulty: 3 of 5Under Tax deduction (in Numbers)
Posted on 2018-08-22 (6 Comments)
re(2): computer solution by Charlie (2018-08-22 13:11:22)
Solution computer solution by Charlie (2018-08-22 10:39:55)
Difficulty: 1 of 5Under What's next? (3) (in Sequences)
Posted on 2018-08-19 (3 Comments)
Solution researched solution by Charlie (2018-08-19 14:13:48)
Difficulty: 4 of 5Under Just a search (in Numbers)
Posted on 2018-08-18 (5 Comments)
Solution computer solution by Charlie (2018-08-18 14:36:33)
Difficulty: 4 of 5Under Ant highway (in Shapes)
Posted on 2018-08-17 (3 Comments)
previous post should have been titled solution (spoiler) by Charlie (2018-08-17 14:29:15)
Solution No Subject by Charlie (2018-08-17 14:23:48)
Difficulty: 3 of 5Under Roll away (in Calculus)
Posted on 2018-08-15 (5 Comments)
Some Thoughts re: An approximate look by graphing by Charlie (2018-08-15 12:40:11)
Some Thoughts An approximate look by graphing by Charlie (2018-08-15 11:50:18)
Difficulty: 2 of 5Under Tippy table (in Shapes)
Posted on 2018-08-14 (3 Comments)
Solution solution by Charlie (2018-08-14 13:56:31)
Difficulty: 2 of 5Under 31 created by 4 successive integers (in Numbers)
Posted on 2018-08-13 (7 Comments)
Solution answer (spoiler) by Charlie (2018-08-13 14:21:42)
Difficulty: 3 of 5Under Quintuplet of consecutive primes (in Numbers)
Posted on 2018-08-11 (3 Comments)
Solution computer solution by Charlie (2018-08-11 13:42:49)
Difficulty: 3 of 5Under Attendance Records (in Numbers)
Posted on 2018-08-10 (4 Comments)
re: Solution by Charlie (2018-08-13 14:30:16)
Difficulty: 2 of 5Under Six or less? (in Just Math)
Posted on 2018-08-09 (6 Comments)
re(2): Don't get me started... (but) ... by Charlie (2018-08-09 19:06:08)
Some Thoughts Don't get me started... (but) ... by Charlie (2018-08-09 09:41:01)
Difficulty: 3 of 5Under Art is marching on.. (in Word Problems)
Posted on 2018-08-08 (6 Comments)
Some Thoughts from my word list by Charlie (2018-08-08 11:36:51)
Difficulty: 3 of 5Under Shirtless ? Even nude! (in Numbers)
Posted on 2018-08-07 (3 Comments)
Solution computer solution by Charlie (2018-08-07 10:37:21)
Difficulty: 4 of 5Under Call 911 (in Just Math)
Posted on 2018-08-03 (2 Comments)
computer exploration (spoilers) by Charlie (2018-08-03 12:01:41)
Difficulty: 3 of 5Under 1st 101-digit prime (in Numbers)
Posted on 2018-08-02 (3 Comments)
Solution computer solution by Charlie (2018-08-02 12:25:55)
Difficulty: 3 of 5Under Lost in Translation (in General)
Posted on 2018-07-31 (9 Comments)
Some Thoughts first one by Charlie (2018-07-31 10:02:27)
Difficulty: 3 of 5Under Ten to five (in Numbers)
Posted on 2018-07-30 (7 Comments)
Solution solution (spoiler) by Charlie (2018-07-30 11:03:24)
Difficulty: 3 of 5Under Special feature (in Numbers)
Posted on 2018-07-29 (6 Comments)
re(2): computer solution and tidbits from a reference by Charlie (2018-07-30 12:21:41)
Solution computer solution and tidbits from a reference by Charlie (2018-07-29 13:06:40)
Difficulty: 3 of 5Under Square - both ways (in Numbers)
Posted on 2018-07-28 (3 Comments)
re: computer solutions by Charlie (2018-07-28 11:59:11)
Solution computer solutions by Charlie (2018-07-28 11:43:29)
Difficulty: 3 of 5Under 8191 has a partner (in Numbers)
Posted on 2018-07-26 (3 Comments)
Solution computer solution by Charlie (2018-07-26 11:26:45)
Difficulty: 2 of 5Under Night Lights - Light Nights (in Science)
Posted on 2018-07-24 (4 Comments)
Some Thoughts my version by Charlie (2018-07-24 10:14:27)
Difficulty: 3 of 5Under Odd-abundant numbers. (in Numbers)
Posted on 2018-07-21 (2 Comments)
Solution ... and then some by Charlie (2018-07-21 14:23:19)
Difficulty: 2 of 5Under An Irrational Demand (in General)
Posted on 2018-07-17 (8 Comments)
What do you do? by Charlie (2018-07-17 12:15:46)
Difficulty: 2 of 5Under Garden Path (in General)
Posted on 2018-07-16 (3 Comments)
browser issue on official solution by Charlie (2018-07-17 08:05:13)
Difficulty: 3 of 5Under Truncatable primes (in Numbers)
Posted on 2018-07-15 (2 Comments)
Solution computer solution by Charlie (2018-07-15 19:20:58)
Difficulty: 3 of 5Under From eleven to ... ETERNITY (in Numbers)
Posted on 2018-07-14 (3 Comments)
Solution computer solution by Charlie (2018-07-14 15:05:06)
Difficulty: 3 of 5Under Counting sudokus (in Numbers)
Posted on 2018-07-13 (6 Comments)
re(2): solution (part 1 only) by Charlie (2018-07-14 15:53:58)
The internet re part 2 (spoiler) by Charlie (2018-07-14 15:42:49)
Solution re: solution (part 1 only) by Charlie (2018-07-14 15:35:08)
Difficulty: 3 of 5Under Aloof prime (in Numbers)
Posted on 2018-07-12 (2 Comments)
Solution discussion and solution by Charlie (2018-07-12 11:06:25)
Difficulty: 3 of 5Under Probability of being coprime (in Probability)
Posted on 2018-07-11 (4 Comments)
Solution re: computer approximation (vs researched solution) by Charlie (2018-07-11 11:56:00)
Solution computer approximation by Charlie (2018-07-11 10:59:31)
Difficulty: 2 of 5Under Sliders II (in Word Problems)
Posted on 2018-07-10 (5 Comments)
Question re: answers by Charlie (2018-07-10 10:57:39)
Difficulty: 2 of 5Under Earth, The Scofflaw Planet (in Science)
Posted on 2018-07-09 (9 Comments)
re: again, not the solution by Charlie (2018-07-09 21:38:18)
solution by Charlie (2018-07-09 19:39:10)
Difficulty: 3 of 5Under Sum of 4 squares (in Numbers)
Posted on 2018-07-08 (4 Comments)
Some Thoughts computer finding (no proof of completeness) by Charlie (2018-07-08 15:55:49)
Difficulty: 3 of 5Under Some prime sequences (in Numbers)
Posted on 2018-07-04 (11 Comments)
re(2): The sequence by Charlie (2018-07-05 20:48:46)
re: No Subject by Charlie (2018-07-05 14:50:11)
re(2): The sequence by Charlie (2018-07-05 11:30:20)
re: The sequence by Charlie (2018-07-05 10:58:19)
Solution Basic language version by Charlie (2018-07-04 12:48:06)
Difficulty: 2 of 5Under Who's on the second base? (in Numbers)
Posted on 2018-07-01 (1 Comments)
Solution solution by Charlie (2018-07-01 10:08:08)
Difficulty: 4 of 5Under Astronomy: Binoculars, for fun and profit (in Science)
Posted on 2018-06-29 (10 Comments)
re(2): Hint by Charlie (2018-07-05 19:58:20)
re: Hint by Charlie (2018-07-05 15:55:18)
Solution How to... by Charlie (2018-06-29 13:40:52)
Difficulty: 3 of 5Under 7 come zero (in Probability)
Posted on 2018-06-28 (5 Comments)
Solution solution by Charlie (2018-06-28 12:26:17)
Difficulty: 3 of 5Under Save my spa! (in Science)
Posted on 2018-06-27 (4 Comments)
Solution spoiler if I did the math right by Charlie (2018-06-27 12:03:59)
Difficulty: 1 of 5Under These are E-Z (in Geometry)
Posted on 2018-06-25 (6 Comments)
re: More on Procedures by Charlie (2018-06-26 20:13:56)
re: Procedure Question by Charlie (2018-06-26 15:25:22)
Solution solution by Charlie (2018-06-25 10:54:49)
Difficulty: 3 of 5Under Sum of reciprocals (in Just Math)
Posted on 2018-06-22 (2 Comments)
Solution computer solution and research by Charlie (2018-06-22 13:10:49)
Difficulty: 3 of 5Under 3 cubes (in Numbers)
Posted on 2018-06-21 (2 Comments)
Solution re: computer lists (spoilers for part a) -- continued, with mixed signs by Charlie (2018-06-21 14:44:30)
Solution computer lists (spoilers for part a) by Charlie (2018-06-21 14:41:59)
Difficulty: 3 of 5Under Non-zero integers (in Just Math)
Posted on 2018-06-20 (6 Comments)
re: this seems the solution by Charlie (2018-06-20 13:36:31)
Solution this seems the solution by Charlie (2018-06-20 13:22:51)
Difficulty: 4 of 5Under Space guys (in Just Math)
Posted on 2018-06-19 (2 Comments)
Solution tabular approach (spoiler) by Charlie (2018-06-19 11:23:38)
Difficulty: 2 of 5Under Counting ones (in Just Math)
Posted on 2018-06-18 (2 Comments)
Solution analytic solution, with computer verification by Charlie (2018-06-18 11:13:43)
Difficulty: 3 of 5Under Square Divisiblity (in Numbers)
Posted on 2018-06-17 (4 Comments)
Some Thoughts thoughts by Charlie (2018-06-17 18:23:05)
Difficulty: 4 of 5Under Play until you win (in Probability)
Posted on 2018-06-15 (2 Comments)
Solution Unsatisfying computer solution (spoiler) by Charlie (2018-06-15 12:08:54)
Difficulty: 3 of 5Under Looking for a square result (in Just Math)
Posted on 2018-06-14 (18 Comments)
re: No Subject by Charlie (2018-06-15 12:17:21)
re(3): computer solution by Charlie (2018-06-15 10:29:47)
re(3): computer solution by Charlie (2018-06-15 10:11:06)
re: computer solution by Charlie (2018-06-15 07:31:40)
Solution computer solution by Charlie (2018-06-15 07:25:52)
Difficulty: 3 of 5Under Cubes of couples (in Numbers)
Posted on 2018-06-12 (2 Comments)
Solution computer solution by Charlie (2018-06-12 16:08:02)
Difficulty: 3 of 5Under Define number n in n letters (in General)
Posted on 2018-06-08 (4 Comments)
re: very limited computer finding by Charlie (2018-06-08 21:50:16)
Some Thoughts very limited computer finding by Charlie (2018-06-08 21:21:36)
Difficulty: 4 of 5Under a NEWS puzzle (in Just Math)
Posted on 2018-06-07 (1 Comments)
Solution computer solution by Charlie (2018-06-07 16:43:27)
Difficulty: 3 of 5Under Palindrome in 4 steps (in Numbers)
Posted on 2018-06-06 (4 Comments)
re(2): computer findings (spoilers) by Charlie (2018-06-06 15:48:04)
Some Thoughts computer findings (spoilers) by Charlie (2018-06-06 12:31:27)
Difficulty: 2 of 5Under Optimal result (in Just Math)
Posted on 2018-06-04 (11 Comments)
Solution hmmm... (spoiler) by Charlie (2018-06-04 10:48:14)
Difficulty: 3 of 5Under Using its own digits (in Numbers)
Posted on 2018-05-31 (9 Comments)
re(5): beyond base 10, continued by Charlie (2018-06-01 10:48:21)
re(4): beyond base 10, analytical solution....TBC by Charlie (2018-06-01 10:43:51)
re(3): beyond base 10, analytical solution....TBC by Charlie (2018-06-01 10:12:25)
re(2): beyond base 10, analytical solution....TBC by Charlie (2018-06-01 08:45:40)
Solution computer solution by Charlie (2018-05-31 14:31:30)
Difficulty: 3 of 5Under Thinking octal (in Numbers)
Posted on 2018-05-30 (2 Comments)
Solution VB program by Charlie (2018-05-30 10:25:17)
Difficulty: 4 of 5Under What is the value of D? (in Just Math)
Posted on 2018-05-27 (1 Comments)
Solution computer to narrow the problem, then analysis of what's left by Charlie (2018-05-27 15:08:52)
Difficulty: 4 of 5Under Ascending order (in Numbers)
Posted on 2018-05-26 (1 Comments)
Solution computer solution (spoiler) by Charlie (2018-05-26 13:00:57)
Difficulty: 3 of 5Under How many drinks do you need? (in Numbers)
Posted on 2018-05-25 (1 Comments)
Solution computer solution by Charlie (2018-05-25 16:03:52)
Difficulty: 3 of 5Under 495 and 6174 (in Numbers)
Posted on 2018-05-24 (3 Comments)
re(2): research and exploration (spoiler) by Charlie (2018-05-25 16:18:02)
Solution research and exploration (spoiler) by Charlie (2018-05-24 13:33:00)
Difficulty: 4 of 5Under Self-numbers and generators (in Numbers)
Posted on 2018-05-23 (8 Comments)
re(2): a. analytic, b. computer, solutions (spoilers for a and b) by Charlie (2018-05-23 16:56:22)
Some Thoughts a. analytic, b. computer, solutions (spoilers for a and b) by Charlie (2018-05-23 13:47:34)
Difficulty: 2 of 5Under Another True Story (in General)
Posted on 2018-05-22 (3 Comments)
Solution this must be how by Charlie (2018-05-22 09:49:08)
Difficulty: 2 of 5Under High and low (in Word Problems)
Posted on 2018-05-21 (3 Comments)
Solution computer solution by Charlie (2018-05-21 10:35:42)
Difficulty: 4 of 5Under Will take some time ?? (in Numbers)
Posted on 2018-05-18 (5 Comments)
re(3): computer solution by Charlie (2018-05-20 20:44:06)
re: computer solution by Charlie (2018-05-19 11:51:47)
Solution computer solution by Charlie (2018-05-18 13:41:56)
Difficulty: 4 of 5Under Just 3 digits (in Sequences)
Posted on 2018-05-17 (4 Comments)
re: interesting aside by Charlie (2018-05-18 13:58:44)
interesting aside by Charlie (2018-05-18 10:18:57)
computer solution by Charlie (2018-05-17 12:32:17)
Difficulty: 3 of 5Under From primes to palindromes (in Numbers)
Posted on 2018-05-16 (4 Comments)
Solution computer solution by Charlie (2018-05-16 13:37:46)
re: OEIS crossreferencing by Charlie (2018-05-16 13:35:57)
Difficulty: 2 of 5Under What's Seven Got To Do With It? (in Sequences)
Posted on 2018-05-14 (2 Comments)
Solution computer extension by Charlie (2018-05-14 10:33:42)
Difficulty: 4 of 5Under How about 138? (in Sequences)
Posted on 2018-05-10 (4 Comments)
Solution computer solution by Charlie (2018-05-10 14:28:13)
Difficulty: 3 of 5Under Strongly related (in Just Math)
Posted on 2018-05-05 (1 Comments)
Solution computer solution by Charlie (2018-05-06 18:18:45)
Difficulty: 2 of 5Under Some of these and some of those (in Numbers)
Posted on 2018-04-30 (2 Comments)
Solution Using the table function of a graphing calculator. by Charlie (2018-04-30 12:09:09)
Difficulty: 3 of 5Under It is not 42 (in Numbers)
Posted on 2018-04-29 (2 Comments)
Solution computer solution by Charlie (2018-04-29 10:42:25)
Difficulty: 3 of 5Under Two random points (in Probability)
Posted on 2018-04-26 (10 Comments)
re: another way by Charlie (2018-04-27 12:19:23)
re(3): There must be a reason for the D3 rating. by Charlie (2018-04-26 12:04:02)
re: There must be a reason for the D3 rating. by Charlie (2018-04-26 10:42:51)
Solution There must be a reason for the D3 rating. by Charlie (2018-04-26 10:16:46)
Difficulty: 3 of 5Under XFL (in General)
Posted on 2018-04-25 (3 Comments)
Solution solution with games spelled out by Charlie (2018-04-25 11:38:24)
Difficulty: 3 of 5Under When polynomial and trigo unite! (in Calculus)
Posted on 2018-04-24 (2 Comments)
Solution solution by Charlie (2018-04-24 12:52:29)
Difficulty: 3 of 5Under Partitura (in Numbers)
Posted on 2018-04-21 (3 Comments)
Solution computer solution by Charlie (2018-04-21 15:55:57)
Difficulty: 3 of 5Under An almost regular tetrahedron (in Geometry)
Posted on 2018-04-20 (3 Comments)
Solution re: solution -- What was I thinking? by Charlie (2018-04-21 17:19:13)
Some Thoughts solution by Charlie (2018-04-20 13:18:39)
Difficulty: 3 of 5Under A primer in Malaga (in Numbers)
Posted on 2018-04-19 (2 Comments)
Solution computer solution by Charlie (2018-04-19 14:52:49)
Difficulty: 3 of 5Under The Devil 30-gon (in Geometry)
Posted on 2018-04-17 (3 Comments)
Solution computer-aided solution by Charlie (2018-04-17 11:38:15)
Difficulty: 3 of 5Under Debugging a system (in Just Math)
Posted on 2018-04-16 (5 Comments)
re(2): Debugged! (spoiler) by Charlie (2018-04-16 21:11:39)
Difficulty: 3 of 5Under Find a Few Functions (in Calculus)
Posted on 2018-04-15 (3 Comments)
Some Thoughts success for part 1; not so much for part 2 by Charlie (2018-04-15 12:33:53)
Difficulty: 2 of 5Under A pandigital set (in Numbers)
Posted on 2018-04-14 (5 Comments)
Solution computer solution by Charlie (2018-04-14 14:04:06)
Difficulty: 4 of 5Under Prime stars (in Just Math)
Posted on 2018-04-13 (2 Comments)
Solution computer solution by Charlie (2018-04-13 12:05:10)
Difficulty: 4 of 5Under Angle in an Equilateral Pentagon (in Geometry)
Posted on 2018-04-12 (3 Comments)
Solution the trig solution by Charlie (2018-04-12 10:55:33)
Difficulty: 3 of 5Under On the road again (in Numbers)
Posted on 2018-04-10 (5 Comments)
re: computer lists possibilities; logic narrows down to actual answers by Charlie (2018-04-10 10:31:44)
Solution computer lists possibilities; logic narrows down to actual answers by Charlie (2018-04-10 10:10:15)
Difficulty: 2 of 5Under The royal sisters (in Just Math)
Posted on 2018-04-09 (3 Comments)
Solution computer assisted solution by Charlie (2018-04-09 10:40:40)
Difficulty: 2 of 5Under Simple recursion (in Sequences)
Posted on 2018-04-08 (1 Comments)
Some Thoughts some thoughts by Charlie (2018-04-08 11:48:35)
Difficulty: 2 of 5Under Squares built from leftovers (in Numbers)
Posted on 2018-04-05 (4 Comments)
re: Solution by cheating by Charlie (2018-04-05 14:51:50)
Solution computer solution by Charlie (2018-04-05 12:27:33)
Difficulty: 3 of 5Under Parenthetical Integer (in Numbers)
Posted on 2018-04-04 (2 Comments)
Solution computer solution with explanation that could have been used as an analytic solution (spoiler) by Charlie (2018-04-04 10:25:35)
Difficulty: 1 of 5Under Cube Decomposition (in Geometry)
Posted on 2018-04-02 (5 Comments)
Solution solution with explanation by Charlie (2018-04-02 14:30:41)
Difficulty: 3 of 5Under Better late than never ...HNY (in Just Math)
Posted on 2018-04-01 (3 Comments)
Solution The equation and the question. by Charlie (2018-04-01 19:33:29)
Difficulty: 3 of 5Under Pascal Determinant (in Just Math)
Posted on 2018-03-31 (3 Comments)
re: computer assisted solution by Charlie (2018-04-11 12:34:22)
Solution computer assisted solution by Charlie (2018-03-31 14:28:37)
Difficulty: 3 of 5Under Comb(k,2) (in Numbers)
Posted on 2018-03-29 (4 Comments)
Some Thoughts solutions through k=1,000,000 by Charlie (2018-03-29 10:11:46)
Difficulty: 2 of 5Under One square implies many (in Sequences)
Posted on 2018-03-28 (6 Comments)
BTW... by Charlie (2018-03-28 10:25:33)
Solution solution assuming all members of the series are integers by Charlie (2018-03-28 10:14:13)
Difficulty: 1 of 5Under Four singers (in Tricks)
Posted on 2018-03-26 (3 Comments)
Solution Is it a "Trick" or not? (spoiler) by Charlie (2018-03-26 10:41:59)
Difficulty: 2 of 5Under Not enough information! (in Science)
Posted on 2018-03-23 (7 Comments)
Solution considering the simultaneity issue by Charlie (2018-03-24 13:11:48)
Solution proposed solution by Charlie (2018-03-23 11:51:25)
Difficulty: 3 of 5Under She has moved (in Numbers)
Posted on 2018-03-22 (2 Comments)
Some Thoughts How I went about it. by Charlie (2018-03-22 10:35:55)
Difficulty: 3 of 5Under All in the USA (in Numbers)
Posted on 2018-03-20 (2 Comments)
Solution computer solution by Charlie (2018-03-20 15:05:39)
Difficulty: 3 of 5Under six and thirteen (in Numbers)
Posted on 2018-03-15 (9 Comments)
Solution computer solution by Charlie (2018-03-15 11:55:36)
Difficulty: 2 of 5Under A Really Weird Math Problem (in Numbers)
Posted on 2018-03-12 (13 Comments)
re: Spoiler (I think . . .) by Charlie (2018-03-12 14:10:03)
Difficulty: 3 of 5Under Another Dudeney problem (in Numbers)
Posted on 2018-03-09 (2 Comments)
Solution computer solution by Charlie (2018-03-09 12:21:01)
Difficulty: 3 of 5Under Summing the factors (in Numbers)
Posted on 2018-03-08 (3 Comments)
Solution a solution by Charlie (2018-03-08 12:24:20)
Difficulty: 2 of 5Under A palindromic equation (in Numbers)
Posted on 2018-03-04 (5 Comments)
Some Thoughts a computer aside (no spoiler) by Charlie (2018-03-04 11:44:38)
Difficulty: 3 of 5Under The Truman Show (in Geometry)
Posted on 2018-03-02 (4 Comments)
Solution solution with error analysis by Charlie (2018-03-02 10:32:54)
Difficulty: 3 of 5Under 15=5*3 (in Sequences)
Posted on 2018-03-01 (1 Comments)
Solution computer solution by Charlie (2018-03-01 15:40:50)
Difficulty: 2 of 5Under Trailing zeros (in Numbers)
Posted on 2018-02-28 (2 Comments)
Solution analytic solution with computer verification by Charlie (2018-02-28 10:35:55)
Difficulty: 3 of 5Under Square products (in Just Math)
Posted on 2018-02-27 (3 Comments)
Some Thoughts computer exploration by Charlie (2018-02-27 14:38:46)
Difficulty: 3 of 5Under 4 digit number derived from a single digit (in Numbers)
Posted on 2018-02-26 (3 Comments)
Solution solution by Charlie (2018-02-26 12:15:47)
Difficulty: 3 of 5Under Sum of subfactorials (in Numbers)
Posted on 2018-02-25 (3 Comments)
Solution computer solution by Charlie (2018-02-25 11:54:05)
Difficulty: 2 of 5Under Completing a triplet (in Numbers)
Posted on 2018-02-24 (5 Comments)
Some Thoughts computer findings by Charlie (2018-02-24 14:05:52)
Difficulty: 3 of 5Under A sixth power in many ways (in Numbers)
Posted on 2018-02-22 (1 Comments)
Solution solution by Charlie (2018-02-22 11:12:10)
Difficulty: 2 of 5Under A state of a State (in General)
Posted on 2018-02-19 (8 Comments)
re: no answer by Charlie (2018-02-20 10:58:42)
re: on first sight by Charlie (2018-02-19 13:54:08)
Difficulty: 3 of 5Under Strictly non-palindromic numbers (in Numbers)
Posted on 2018-02-18 (3 Comments)
Solution computer exploration and solution to 3.5 parts by Charlie (2018-02-18 12:07:57)
Difficulty: 3 of 5Under Double Secant (in Geometry)
Posted on 2018-02-15 (3 Comments)
Some Thoughts not a mathematical proof, but beyond a reasonable doubt by Charlie (2018-02-15 09:29:37)
Difficulty: 3 of 5Under Four fours (in Numbers)
Posted on 2018-02-14 (7 Comments)
Solution re: minor tweak to three fours program; 7 goal numbers remain unsolved by Charlie (2018-02-14 23:02:47)
Some Thoughts minor tweak to three fours program; 7 goal numbers remain unsolved by Charlie (2018-02-14 10:35:12)
Difficulty: 3 of 5Under Using nine positive digits (in Numbers)
Posted on 2018-02-11 (3 Comments)
Solution solution in keeping with the title by Charlie (2018-02-11 14:38:55)
Difficulty: 3 of 5Under En francais seulement ! (in Numbers)
Posted on 2018-02-09 (3 Comments)
Some Thoughts ummm.... by Charlie (2018-02-09 13:15:47)
Difficulty: 3 of 5Under A couple of squares (in Numbers)
Posted on 2018-02-02 (9 Comments)
re(2): solution (spoiler) by Charlie (2018-02-03 07:58:35)
Solution solution (spoiler) by Charlie (2018-02-02 13:18:35)
Difficulty: 2 of 5Under Cute numbers (in Numbers)
Posted on 2018-02-01 (4 Comments)
re: Also by Charlie (2018-02-02 13:29:18)
Solution solution by Charlie (2018-02-01 11:24:36)
Difficulty: 2 of 5Under 113 together (in Just Math)
Posted on 2018-01-30 (4 Comments)
Solution the algebra and a variation by Charlie (2018-01-30 10:20:29)
Difficulty: 3 of 5Under Quite a pair! (in Numbers)
Posted on 2018-01-26 (2 Comments)
Solution computer solution by Charlie (2018-01-26 14:13:29)
Difficulty: 3 of 5Under Quadrilateral fill in the blank (in Shapes)
Posted on 2018-01-25 (2 Comments)
Some Thoughts playing with GSP -- no proof by Charlie (2018-01-25 10:31:54)
Difficulty: 2 of 5Under Starting the Scrabble Game (in Probability)
Posted on 2018-01-24 (8 Comments)
re(3): No Subject by Charlie (2018-01-24 21:47:57)
re: No Subject by Charlie (2018-01-24 15:15:51)
Difficulty: 4 of 5Under Champagnat numbers (in Just Math)
Posted on 2018-01-23 (2 Comments)
Solution a proof by Charlie (2018-01-23 15:00:21)
Difficulty: 3 of 5Under The Sleeping Beauty problem (in Probability)
Posted on 2018-01-22 (4 Comments)
Solution solution by Charlie (2018-01-22 12:29:25)
Difficulty: 2 of 5Under Quite a coincidence (in Just Math)
Posted on 2018-01-19 (6 Comments)
Solution proposed solution by Charlie (2018-01-19 11:41:55)
Difficulty: 4 of 5Under A set of subsets (in Just Math)
Posted on 2018-01-17 (2 Comments)
Solution computer solution by Charlie (2018-01-17 11:37:00)
Difficulty: 2 of 5Under Fair slices (in Geometry)
Posted on 2018-01-16 (8 Comments)
re: To avoid kids figthting by Charlie (2018-01-17 11:42:03)
Difficulty: 1 of 5Under Get even (in Numbers)
Posted on 2018-01-15 (3 Comments)
Solution solution transcribed from pencil and paper, with explanation added by Charlie (2018-01-15 10:01:01)
Difficulty: 2 of 5Under Funny way to divide by seven (in Numbers)
Posted on 2018-01-12 (3 Comments)
Solution computer finding of numbers that can be divided that way by Charlie (2018-01-12 19:33:39)
Difficulty: 4 of 5Under 15 letter 'words' (in Just Math)
Posted on 2018-01-11 (4 Comments)
Solution 2 algorithms same answer--computer assisted (spoiler) by Charlie (2018-01-11 16:21:19)
Difficulty: 3 of 5Under Discounting one (in Numbers)
Posted on 2018-01-10 (9 Comments)
re: if you allow negatives by Charlie (2018-01-10 20:32:41)
Solution re(3): The only way to do it. Confused by Charlie (2018-01-10 15:56:45)
re(2): The only way to do it. Confused by Charlie (2018-01-10 15:51:32)
Solution The only way to do it. (computer solution included) by Charlie (2018-01-10 14:04:44)
Difficulty: 3 of 5Under A meeting point (in Just Math)
Posted on 2018-01-07 (2 Comments)
Solution solution by Charlie (2018-01-07 12:24:25)
Difficulty: 3 of 5Under Overheard in Manitoba (in Numbers)
Posted on 2018-01-06 (6 Comments)
re(2): An aside, beyond the solution by Charlie (2018-01-07 08:27:51)
Some Thoughts An aside, beyond the solution by Charlie (2018-01-06 16:02:12)
Difficulty: 3 of 5Under Simple fractions (in Just Math)
Posted on 2018-01-03 (3 Comments)
Treating as probabilities by Charlie (2018-01-03 15:54:38)
Difficulty: 3 of 5Under 5-digit number (in Just Math)
Posted on 2018-01-02 (2 Comments)
Solution assuming beforehand that the title is meaningful by Charlie (2018-01-02 13:31:46)
Difficulty: 2 of 5Under Three triplets (in Numbers)
Posted on 2017-12-30 (6 Comments)
re(2): computer solution finds one more by Charlie (2017-12-31 08:04:12)
Solution computer solution finds one more by Charlie (2017-12-30 15:37:48)
Difficulty: 3 of 5Under Pandigital and divisible (in Numbers)
Posted on 2017-12-29 (3 Comments)
Solution computer solution (spoiler) by Charlie (2017-12-29 11:15:53)
Difficulty: 2 of 5Under A prime nonuplet (in Numbers)
Posted on 2017-12-27 (4 Comments)
Solution computer solution (spoiler) by Charlie (2017-12-27 12:47:03)
Difficulty: 3 of 5Under Expanding the railroad line (in Just Math)
Posted on 2017-12-26 (2 Comments)
Solution computer solutions by Charlie (2017-12-26 13:51:49)
Difficulty: 3 of 5Under The Young Girl's Age (in Just Math)
Posted on 2017-12-25 (2 Comments)
Solution computer solution (spoiler) by Charlie (2017-12-25 14:37:12)
Difficulty: 3 of 5Under Persistence I (in Numbers)
Posted on 2017-12-24 (3 Comments)
Some Thoughts some analysis; some computation-- solution except for b) in base 3. by Charlie (2017-12-24 14:13:06)
Difficulty: 3 of 5Under Do not say ONE (in Games)
Posted on 2017-12-23 (3 Comments)
Some Thoughts Researched answer by Charlie (2017-12-23 16:26:49)
Difficulty: 3 of 5Under Magic circle revisited (in Numbers)
Posted on 2017-12-22 (5 Comments)
Solution Computer exploration and OEIS identification. by Charlie (2017-12-22 13:04:22)
Difficulty: 3 of 5Under One problem - many ways to solve... (in Numbers)
Posted on 2017-12-21 (6 Comments)
Solution My ways by Charlie (2017-12-21 11:31:11)
Difficulty: 3 of 5Under A true story (in Numbers)
Posted on 2017-12-20 (6 Comments)
Some Thoughts a start by Charlie (2017-12-20 16:30:13)
Difficulty: 3 of 5Under East Pole, West Pole. (in General)
Posted on 2017-12-19 (2 Comments)
Some Thoughts My thoughts on the subject by Charlie (2017-12-19 10:31:31)
Difficulty: 1 of 5Under Given one, get the other three (in Numbers)
Posted on 2017-12-18 (2 Comments)
Solution solution by Charlie (2017-12-18 14:09:02)
Difficulty: 3 of 5Under Fibo's zeroes repeated (in Numbers)
Posted on 2017-12-14 (1 Comments)
Solution computer-aided solution by Charlie (2017-12-14 11:04:56)
Difficulty: 4 of 5Under LOP (in Geometry)
Posted on 2017-12-13 (7 Comments)
re(2): GSP exploration by Charlie (2017-12-14 10:16:46)
re(2): GSP exploration by Charlie (2017-12-13 15:24:45)
re: GSP exploration by Charlie (2017-12-13 15:02:18)
Some Thoughts GSP exploration by Charlie (2017-12-13 12:12:07)
Difficulty: 3 of 5Under Perform and explain (in Tricks)
Posted on 2017-12-12 (11 Comments)
re(2): Computer results--but but but... by Charlie (2017-12-13 07:48:50)
re: Answer by Charlie (2017-12-12 11:30:34)
re: Computer results -- proof of sorts by Charlie (2017-12-12 11:27:25)
Solution Computer results by Charlie (2017-12-12 11:01:33)
Difficulty: 2 of 5Under Enigma (in Logic)
Posted on 2017-12-11 (4 Comments)
re: Just kidding (spoiler) by Charlie (2017-12-11 11:06:33)
Difficulty: 4 of 5Under Verify and prove (in Sequences)
Posted on 2017-12-10 (5 Comments)
Solution re: computer verification no proof ... or, come to think about it ... by Charlie (2017-12-10 10:32:30)
Some Thoughts computer verification no proof by Charlie (2017-12-10 10:26:50)
Difficulty: 4 of 5Under All, except two (in Sequences)
Posted on 2017-12-09 (4 Comments)
re: ERRATIC SOLUTION (spoiler) by Charlie (2017-12-09 17:43:57)
Difficulty: 3 of 5Under Spelling bee results (in Just Math)
Posted on 2017-12-08 (1 Comments)
Solution computer solution with most of the bonuses by Charlie (2017-12-08 15:24:50)
Difficulty: 3 of 5Under Three fours (in Numbers)
Posted on 2017-12-06 (3 Comments)
re(2): computer solutions (spoilers) by Charlie (2017-12-07 09:05:40)
Solution computer solutions (spoilers) by Charlie (2017-12-06 19:34:47)
Difficulty: 3 of 5Under Just name the date (in General)
Posted on 2017-12-05 (2 Comments)
Solution solution by Charlie (2017-12-05 10:03:01)
Difficulty: 3 of 5Under Just 4 different digits (in Numbers)
Posted on 2017-12-03 (10 Comments)
re: @ Charlie: Answers for the revised puzzle: by Charlie (2017-12-03 19:29:13)
just 3 different digits by Charlie (2017-12-03 12:03:10)
Solution re(2): Too many - here's some by Charlie (2017-12-03 11:45:15)
re: computer solution to the puzzle as is continued by Charlie (2017-12-03 11:31:35)
Solution computer solution to the puzzle as is by Charlie (2017-12-03 11:30:08)
Difficulty: 4 of 5Under One ninth of a pandigital (in Numbers)
Posted on 2017-12-02 (1 Comments)
Solution computer solution by Charlie (2017-12-02 14:44:27)
Difficulty: 3 of 5Under A square pairing (in Numbers)
Posted on 2017-11-29 (1 Comments)
Solution computer solution by Charlie (2017-11-29 13:31:55)
Difficulty: 3 of 5Under Dice stacking (in Games)
Posted on 2017-11-28 (4 Comments)
re(3): solution (spoiler) by Charlie (2017-11-28 13:31:14)
re: solution (spoiler) by Charlie (2017-11-28 10:00:11)
Solution solution (spoiler) by Charlie (2017-11-28 09:53:21)
Difficulty: 1 of 5Under Quickie XI (in Numbers)
Posted on 2017-11-27 (3 Comments)
Solution solution by Charlie (2017-11-27 13:06:02)
Difficulty: 3 of 5Under A special pandigital (in Numbers)
Posted on 2017-11-26 (1 Comments)
Solution computer solution by Charlie (2017-11-26 16:30:12)
Difficulty: 4 of 5Under Unique decimal primes (in Algorithms)
Posted on 2017-11-24 (1 Comments)
Some Thoughts computer exploration by Charlie (2017-11-24 14:22:49)
Difficulty: 3 of 5Under A pandigital sum (in Numbers)
Posted on 2017-11-21 (1 Comments)
Solution computer solution (spoiler) by Charlie (2017-11-21 10:32:45)
Difficulty: 3 of 5Under What is .... ...... (in Numbers)
Posted on 2017-11-19 (1 Comments)
Solution computer solution by Charlie (2017-12-02 14:55:23)
Difficulty: 3 of 5Under Ulam numbers II (in Numbers)
Posted on 2017-11-18 (1 Comments)
Solution computer "solution" by Charlie (2017-11-18 16:10:30)
Difficulty: 3 of 5Under Pythagorean areas (in Numbers)
Posted on 2017-11-17 (7 Comments)
re: computer solution after fixing bug by Charlie (2017-11-19 09:48:06)
Solution computer solution after fixing bug by Charlie (2017-11-19 08:44:36)
Some Thoughts Either .... by Charlie (2017-11-17 14:26:43)
Difficulty: 3 of 5Under Where Did You Start? (in Just Math)
Posted on 2017-11-16 (3 Comments)
Solution tried analytic but had to resort to program (spoiler) by Charlie (2017-11-16 15:19:18)
Difficulty: 3 of 5Under Your creativity challenged (in Riddles)
Posted on 2017-11-15 (7 Comments)
I'm not sure why that posted twice by Charlie (2017-11-15 10:15:28)
Some Thoughts two ideas by Charlie (2017-11-15 10:13:32)
Some Thoughts two ideas by Charlie (2017-11-15 10:13:32)
Difficulty: 3 of 5Under Fun primes (in Numbers)
Posted on 2017-11-14 (2 Comments)
Solution computer solution by Charlie (2017-11-14 14:08:09)
Difficulty: 3 of 5Under Making a 10 (in Numbers)
Posted on 2017-11-13 (4 Comments)
re: 02 01 2387 (Spoiler) by Charlie (2017-11-13 14:46:41)
Difficulty: 3 of 5Under Beast number as a substring (in Numbers)
Posted on 2017-11-11 (2 Comments)
Solution computer investigation including a solution by Charlie (2017-11-11 12:02:15)
Difficulty: 3 of 5Under Talking BIG (in Numbers)
Posted on 2017-11-10 (3 Comments)
Solution solution by Charlie (2017-11-10 11:02:25)
Difficulty: 3 of 5Under Reverse Engineering I (in Cryptography)
Posted on 2017-11-09 (5 Comments)
Solution answer by Charlie (2017-11-09 13:25:23)
Difficulty: 2 of 5Under One digit answer (in Numbers)
Posted on 2017-11-08 (3 Comments)
re: Solution by Charlie (2017-11-08 15:49:59)
Difficulty: 2 of 5Under Attributed to Lewis Carroll (in Probability)
Posted on 2017-11-07 (4 Comments)
Solution 2 scenarios: with and without replacement by Charlie (2017-11-07 14:19:37)
Difficulty: 2 of 5Under Rectangle in a circle (in Just Math)
Posted on 2017-11-07 (4 Comments)
Solution GSP and calculus solution by Charlie (2017-11-07 10:07:58)
Difficulty: 3 of 5Under No big digits involved (in Numbers)
Posted on 2017-11-06 (2 Comments)
Solution solution by Charlie (2017-11-06 18:04:58)
Difficulty: 2 of 5Under Searching for the minimal repunit (in Numbers)
Posted on 2017-11-06 (1 Comments)
Solution computer solution by Charlie (2017-11-06 12:38:05)
Difficulty: 3 of 5Under Square triplets (in Just Math)
Posted on 2017-11-05 (2 Comments)
Solution computer solution by Charlie (2017-11-05 14:14:00)
Difficulty: 4 of 5Under Truth or consequences (in Just Math)
Posted on 2017-11-02 (3 Comments)
Solution solution by Charlie (2017-11-02 17:51:44)
Difficulty: 3 of 5Under Counting appearances (in Numbers)
Posted on 2017-11-01 (1 Comments)
Solution solution by Charlie (2017-11-01 16:09:16)
Difficulty: 2 of 5Under Mutual dependence (in Numbers)
Posted on 2017-11-01 (3 Comments)
Solution answer by Charlie (2017-11-01 10:55:23)
Difficulty: 2 of 5Under 2 ways to prove it (in Just Math)
Posted on 2017-10-31 (4 Comments)
Solution my offered proofs... are they really the same by Charlie (2017-10-31 13:58:26)
Difficulty: 2 of 5Under Create 2 congruent triangles (in Geometry)
Posted on 2017-10-31 (4 Comments)
re: Solution (spoiler) by Charlie (2017-10-31 10:30:21)
Solution solution by Charlie (2017-10-31 10:23:52)
Difficulty: 2 of 5Under Letters in a Box (in Logic)
Posted on 2017-10-30 (3 Comments)
My apologies re: official solution by Charlie (2017-11-16 18:47:36)
Difficulty: 4 of 5Under A common feature (in Numbers)
Posted on 2017-10-29 (1 Comments)
Solution researched solution by Charlie (2017-10-29 11:35:41)
Difficulty: 3 of 5Under Two SPECIAL PARTITIONS (in Numbers)
Posted on 2017-10-28 (4 Comments)
oh, and the program... by Charlie (2017-10-28 11:22:23)
re: computer solution by Charlie (2017-10-28 11:20:37)
Solution computer solution by Charlie (2017-10-28 11:17:31)
Difficulty: 2 of 5Under Leaving the least (the most) (in Numbers)
Posted on 2017-10-27 (2 Comments)
Solution computer solutions by Charlie (2017-10-27 10:40:23)
Difficulty: 2 of 5Under It is not SIX (in Numbers)
Posted on 2017-10-26 (4 Comments)
Solution computer solution (spoiler) by Charlie (2017-10-26 10:42:39)
Difficulty: 3 of 5Under Obtuse angle? (in Probability)
Posted on 2017-10-25 (3 Comments)
Solution solutions by Charlie (2017-10-25 15:02:17)
Difficulty: 3 of 5Under One word - created by two others (in Word Problems)
Posted on 2017-10-25 (3 Comments)
re: No Subject by Charlie (2017-10-25 10:41:00)
Difficulty: 2 of 5Under 3 multiples of cubes (in Numbers)
Posted on 2017-10-24 (1 Comments)
Solution computer solution by Charlie (2017-10-24 11:06:36)
Difficulty: 3 of 5Under Urban architecture (in Word Problems)
Posted on 2017-10-23 (3 Comments)
Some Thoughts computer findings by Charlie (2017-10-23 15:52:28)
Difficulty: 4 of 5Under 31 or more (in Games)
Posted on 2017-10-21 (6 Comments)
re: computer aided solution by Charlie (2017-10-21 17:16:49)
Solution computer aided solution by Charlie (2017-10-21 16:59:55)
Difficulty: 4 of 5Under 3 lowest score words (in Word Problems)
Posted on 2017-10-20 (3 Comments)
Solution computer solution by Charlie (2017-10-20 16:14:49)
Difficulty: 3 of 5Under Does it continue? An original. (in Numbers)
Posted on 2017-10-20 (7 Comments)
re(2): computer solution by Charlie (2017-10-20 14:21:05)
Solution computer solution by Charlie (2017-10-20 11:04:42)
Difficulty: 3 of 5Under The Odds Must Be Crazy (in Probability)
Posted on 2017-10-19 (4 Comments)
re(2): My take on it by Charlie (2017-10-19 22:37:36)
Some Thoughts My take on it by Charlie (2017-10-19 13:43:53)
Difficulty: 4 of 5Under √22 (in Numbers)
Posted on 2017-10-18 (3 Comments)
Solution short general proof by Charlie (2017-10-18 15:28:53)
Difficulty: 3 of 5Under SUM = PR0DUCT (in Numbers)
Posted on 2017-10-18 (3 Comments)
Solution computer solution by Charlie (2017-10-18 10:52:00)
Difficulty: 4 of 5Under Alfey revava ... (in General)
Posted on 2017-10-17 (3 Comments)
re: computer solution by Charlie (2017-10-17 16:25:34)
Solution computer solution by Charlie (2017-10-17 16:16:32)
Difficulty: 3 of 5Under 9 cubes (in Numbers)
Posted on 2017-10-17 (1 Comments)
Solution computer solution by Charlie (2017-10-17 12:51:10)
Difficulty: 3 of 5Under He, me, and you (in Word Problems)
Posted on 2017-10-16 (2 Comments)
computer aided part 1 by Charlie (2017-10-16 18:32:37)
Difficulty: 3 of 5Under Two-three integers (in Numbers)
Posted on 2017-10-15 (6 Comments)
re: Analytic Solution by Charlie (2017-10-15 21:16:32)
re(2): computer-aided solution -- another number continued by Charlie (2017-10-15 17:01:30)
re: computer-aided solution -- another number by Charlie (2017-10-15 16:57:59)
Solution computer-aided solution by Charlie (2017-10-15 16:54:45)
Difficulty: 4 of 5Under What's out? (in Word Problems)
Posted on 2017-10-13 (3 Comments)
re: anagrammatic spoilers by Charlie (2017-10-13 10:27:05)
Difficulty: 3 of 5Under Equal Power Sum Sets (in Numbers)
Posted on 2017-10-11 (1 Comments)
Solution computer solution by Charlie (2017-10-11 15:13:30)
Difficulty: 3 of 5Under Somewhere in the USA (in Word Problems)
Posted on 2017-10-10 (6 Comments)
Solution Computer search finds other geographic entities by Charlie (2017-10-10 13:35:40)
Difficulty: 3 of 5Under Does it continue? 10: Alternate differences (in Numbers)
Posted on 2017-10-07 (2 Comments)
Some Thoughts computer exploration by Charlie (2017-10-07 22:22:53)
Difficulty: 4 of 5Under Squeeze in (in Word Problems)
Posted on 2017-10-05 (5 Comments)
Solution computer aided solution by Charlie (2017-10-05 14:43:54)
Difficulty: 3 of 5Under In Europe (in General)
Posted on 2017-10-04 (7 Comments)
re(2): the equation part by Charlie (2017-10-04 13:35:08)
Some Thoughts the equation part by Charlie (2017-10-04 10:26:43)
Difficulty: 3 of 5Under A set of ages (in Just Math)
Posted on 2017-10-02 (1 Comments)
Solution computer aided solution by Charlie (2017-10-02 11:07:08)
Difficulty: 3 of 5Under Oddly even numbers (in Numbers)
Posted on 2017-10-01 (1 Comments)
Solution computer solution by Charlie (2017-10-01 15:48:18)
Difficulty: 3 of 5Under Does it continue? 8: Prime together (in Numbers)
Posted on 2017-09-30 (1 Comments)
Solution computer solution by Charlie (2017-09-30 15:52:22)
Difficulty: 4 of 5Under A scrambled BEDLAM (in Just Math)
Posted on 2017-09-29 (2 Comments)
Solution with computer assistance by Charlie (2017-09-29 10:42:53)
Difficulty: 3 of 5Under Does it continue? 7: Partial sums again (in Numbers)
Posted on 2017-09-28 (1 Comments)
Some Thoughts computer exploration by Charlie (2017-09-28 15:15:27)
Difficulty: 3 of 5Under Toasting the eternal (in Just Math)
Posted on 2017-09-27 (3 Comments)
Solution computer solution (spoilers) by Charlie (2017-09-27 11:49:50)
Difficulty: 3 of 5Under Does it continue? 6: Partial sums (in Numbers)
Posted on 2017-09-25 (7 Comments)
Some Thoughts answers by Charlie (2017-09-25 12:32:44)
Difficulty: 3 of 5Under Does it continue? 5: powers of 2 (in Numbers)
Posted on 2017-09-24 (6 Comments)
Some Thoughts computer findings by Charlie (2017-09-24 16:53:43)
Difficulty: 4 of 5Under 3 by 3 by 5 (in Word Problems)
Posted on 2017-09-22 (6 Comments)
Some Thoughts computer finds few words, apparently not all compatible by Charlie (2017-09-22 12:17:16)
Some Thoughts only two words found -- no computer program used by Charlie (2017-09-22 10:38:15)
Difficulty: 3 of 5Under Does it continue? 4: Euclid's next prime (in Numbers)
Posted on 2017-09-21 (3 Comments)
Some Thoughts Initial thought and computer exploration by Charlie (2017-09-21 13:05:22)
Difficulty: 3 of 5Under Does it continue? 3: Growing table of primes (in Numbers)
Posted on 2017-09-19 (3 Comments)
Solution first thought and computer vindication by Charlie (2017-09-19 10:54:29)
Difficulty: 4 of 5Under Reverse Engineering (in General)
Posted on 2017-09-15 (3 Comments)
Solution researched answer by Charlie (2017-09-15 10:45:16)
Difficulty: 2 of 5Under Does it continue? 1: Chord regions (in Sequences)
Posted on 2017-09-13 (9 Comments)
re(2): Huh?......ehe by Charlie (2017-09-13 10:44:18)
Difficulty: 2 of 5Under MMMMMM Donut (in Just Math)
Posted on 2017-09-11 (4 Comments)
Solution solution by Charlie (2017-09-11 12:16:35)
Difficulty: 4 of 5Under Product of 100 factorials (in Just Math)
Posted on 2017-09-07 (8 Comments)
bringing my original table up to n=100 by Charlie (2017-09-08 11:05:02)
miscellany by Charlie (2017-09-08 08:51:28)
Some Thoughts when it works -- computer exploration by Charlie (2017-09-07 10:53:24)
Difficulty: 3 of 5Under Who began with 50 cents? (in Just Math)
Posted on 2017-09-06 (3 Comments)
Solution solution by Charlie (2017-09-06 13:13:58)
Difficulty: 3 of 5Under Getting closer to your pie (in Numbers)
Posted on 2017-09-04 (10 Comments)
re(2): A little less obvious, for part c by Charlie (2017-09-05 07:40:34)
Some Thoughts A little less obvious, for part c by Charlie (2017-09-04 10:36:41)
Difficulty: 2 of 5Under Two sums of digits (in Just Math)
Posted on 2017-09-02 (5 Comments)
Solution computer solution (spoilers) by Charlie (2017-09-02 12:54:29)
Difficulty: 3 of 5Under Tea-time cakes (in Just Math)
Posted on 2017-09-01 (2 Comments)
Solution of course there's the computer way by Charlie (2017-09-01 13:53:37)
Difficulty: 3 of 5Under Are we there yet? (in Probability)
Posted on 2017-08-30 (5 Comments)
re: Part 3 by Charlie (2017-08-31 15:40:15)
Some Thoughts parts 1 & 2 only; outline of 3 by Charlie (2017-08-30 12:28:14)
Difficulty: 1 of 5Under Triangle in a triangle (in Shapes)
Posted on 2017-08-28 (4 Comments)
Solution answer by Charlie (2017-08-28 12:17:22)
Difficulty: 3 of 5Under Strobogrammatic to pandigital (in Numbers)
Posted on 2017-08-26 (4 Comments)
Solution computer solution by Charlie (2017-08-26 16:31:15)
Difficulty: 3 of 5Under Leaving a maximal result (in Algorithms)
Posted on 2017-08-25 (3 Comments)
Solution algorithm by Charlie (2017-08-25 10:47:40)
Difficulty: 3 of 5Under Next Numbers Please #9 (in Numbers)
Posted on 2017-08-23 (9 Comments)
re(5): When 12 appears by Charlie (2017-08-29 09:54:43)
re(4): When 12 appears by Charlie (2017-08-29 09:47:19)
Difficulty: 3 of 5Under The trio (in Liars and Knights)
Posted on 2017-08-21 (1 Comments)
Solution solution by Charlie (2017-08-21 12:23:07)
Difficulty: 3 of 5Under A repunit product (in Word Problems)
Posted on 2017-08-19 (5 Comments)
Solution solution by Charlie (2017-08-19 22:04:28)
Difficulty: 4 of 5Under Marbles in boxes (in Algorithms)
Posted on 2017-08-16 (5 Comments)
Solution solution by Charlie (2017-08-16 11:41:37)
Difficulty: 3 of 5Under Divisibility in a sequence (in Numbers)
Posted on 2017-08-12 (2 Comments)
Existence proof (lowest pair requiring 79) by Charlie (2017-08-12 12:36:27)
Solution proof (but not a proof that this is the lowest achievable) by Charlie (2017-08-12 11:42:49)
Difficulty: 3 of 5Under Bob and Alice make a poor choice (in Numbers)
Posted on 2017-08-11 (7 Comments)
Solution re(2): solution (spoiler) - precision check by Charlie (2017-08-11 14:29:42)
Solution solution (spoiler) by Charlie (2017-08-11 12:33:55)
Difficulty: 3 of 5Under Straight or rotated (in Numbers)
Posted on 2017-08-10 (3 Comments)
Solution program and solution (spoilers) by Charlie (2017-08-10 11:16:22)
Difficulty: 3 of 5Under Even (related) chances (in Probability)
Posted on 2017-08-09 (4 Comments)
Solution solution (spoiler) by Charlie (2017-08-09 11:34:37)
Difficulty: 3 of 5Under Palindromic sum (in Just Math)
Posted on 2017-08-08 (3 Comments)
Solution The "grunt work" left to the computer (spoiler) by Charlie (2017-08-08 10:13:42)
Difficulty: 3 of 5Under A text sans (in Word Problems)
Posted on 2017-08-07 (1 Comments)
Solution He who hesitates is lost by Charlie (2017-08-07 12:33:13)
Difficulty: 4 of 5Under A unique Heronian triangle (in Geometry)
Posted on 2017-08-05 (6 Comments)
re(4): easy - spoiler by Charlie (2017-08-06 07:58:16)
Difficulty: 4 of 5Under Published in the thirties (in Famous Riddles)
Posted on 2017-08-03 (5 Comments)
Solution An Isle of Joy (this is not Kansas any more) (spoiler) by Charlie (2017-08-04 10:18:07)
Difficulty: 4 of 5Under Think big (in Numbers)
Posted on 2017-08-03 (2 Comments)
Solution Actually it could be done with VB by Charlie (2017-08-03 11:08:15)
Solution Think Big ... Think UBASIC (spoilers) by Charlie (2017-08-03 10:31:36)
Difficulty: 3 of 5Under Dec = xeh (in Numbers)
Posted on 2017-08-02 (5 Comments)
Solution computer solutions. Don't know the commonality. by Charlie (2017-08-02 14:16:35)
Difficulty: 2 of 5Under Two parallelograms (in Geometry)
Posted on 2017-08-01 (4 Comments)
Solution GSP by Charlie (2017-08-01 10:11:30)
Difficulty: 3 of 5Under Find this word (in Word Problems)
Posted on 2017-07-31 (8 Comments)
Solution Funny... (spoilers) by Charlie (2017-07-31 10:27:48)
Difficulty: 4 of 5Under Add'em all ! (in Numbers)
Posted on 2017-07-27 (3 Comments)
Solution computer solution (spoiler) by Charlie (2017-07-27 10:30:14)
Difficulty: 3 of 5Under Pandigitals Divided by 11 (in Numbers)
Posted on 2017-07-23 (4 Comments)
Some Thoughts computer exploration by Charlie (2017-07-23 10:39:48)
Difficulty: 3 of 5Under Almost-pandigital sets (in Numbers)
Posted on 2017-07-22 (1 Comments)
Solution computer solution by Charlie (2017-07-22 11:32:40)
Difficulty: 3 of 5Under 2 bases (in Numbers)
Posted on 2017-07-21 (2 Comments)
Solution computer solution (spoiler) by Charlie (2017-07-21 10:47:40)
Difficulty: 2 of 5Under 3 and 4-digit numbers (in Numbers)
Posted on 2017-07-17 (7 Comments)
re(3): Just counting (spoiler) by Charlie (2017-07-17 21:59:59)
re: Just counting (spoiler) by Charlie (2017-07-17 13:53:40)
Difficulty: 3 of 5Under Brazilian numbers (in Sequences)
Posted on 2017-07-15 (4 Comments)
Program had a bug -- fixed it by Charlie (2017-07-15 12:36:30)
Difficulty: 4 of 5Under Unpainting Black (in Probability)
Posted on 2017-07-14 (5 Comments)
Details of the results by Charlie (2017-07-15 11:29:16)
Solution corrected program with revised answer by Charlie (2017-07-14 22:20:16)
Some Thoughts proposed computer solution by Charlie (2017-07-14 17:05:24)
re: Preliminary work & thoughts by Charlie (2017-07-14 10:13:03)
Difficulty: 3 of 5Under Make the proof full-proof (in Word Problems)
Posted on 2017-07-11 (1 Comments)
Solution first the computer,then a human correction by Charlie (2017-07-11 10:48:27)
Difficulty: 3 of 5Under Pythagorean H/L ratios (in Just Math)
Posted on 2017-07-08 (2 Comments)
Solution computer solution by Charlie (2017-07-08 11:49:48)
Difficulty: 4 of 5Under Commutative Exponentiation (in Just Math)
Posted on 2017-07-07 (7 Comments)
Some Thoughts exploration by Charlie (2017-07-07 14:22:36)
Difficulty: 4 of 5Under Just add 2 letters (in Word Problems)
Posted on 2017-07-06 (3 Comments)
Solution computer findings (spoilers) by Charlie (2017-07-06 09:53:55)
Difficulty: 3 of 5Under 4 couples make a new word (in Word Problems)
Posted on 2017-07-04 (3 Comments)
The preceding subject should have been computer solution (spoiler) by Charlie (2017-07-04 13:38:54)
Solution No Subject by Charlie (2017-07-04 13:37:01)
Difficulty: 2 of 5Under Larger area / larger perimeter (in Numbers)
Posted on 2017-07-03 (3 Comments)
Solution computer solution by Charlie (2017-07-03 14:24:05)
Difficulty: 3 of 5Under 38s and Bunches of 1s (in Numbers)
Posted on 2017-06-30 (8 Comments)
re(2): No proof but a pattern found by Charlie (2017-06-30 10:14:56)
Some Thoughts No proof but a pattern found by Charlie (2017-06-30 09:04:10)
Difficulty: 3 of 5Under Square Egyptians (in Numbers)
Posted on 2017-06-28 (1 Comments)
Solution computer solution by Charlie (2017-06-28 13:59:04)
Difficulty: 3 of 5Under Words and hints (in General)
Posted on 2017-06-27 (2 Comments)
Solution computer aided solution by Charlie (2017-06-27 12:23:17)
Difficulty: 3 of 5Under 2017 to start with (in Numbers)
Posted on 2017-06-23 (7 Comments)
re(2): computer results (spoilers) extended by Charlie (2017-06-24 17:32:15)
program by Charlie (2017-06-23 18:17:48)
Solution computer results (spoilers) by Charlie (2017-06-23 18:11:50)
Difficulty: 3 of 5Under Letters to digits to letters (in Numbers)
Posted on 2017-06-22 (1 Comments)
Solution computer solution by Charlie (2017-06-22 10:34:01)
Difficulty: 3 of 5Under Odd Egyptians (in Numbers)
Posted on 2017-06-21 (2 Comments)
re: Programming exercise (spoiler); 20/20 hindsight by Charlie (2017-06-21 21:53:57)
Solution Programming exercise (spoiler); 20/20 hindsight by Charlie (2017-06-21 16:02:27)
Difficulty: 3 of 5Under Make It Even Again (in Probability)
Posted on 2017-06-20 (4 Comments)
Some Thoughts computer findings by Charlie (2017-06-20 15:18:19)
Difficulty: 2 of 5Under Punchline I (in Word Problems)
Posted on 2017-06-19 (3 Comments)
Solution Part 2: Of course it was... by Charlie (2017-06-19 14:37:35)
Difficulty: 3 of 5Under Love story (in General)
Posted on 2017-06-17 (2 Comments)
Solution computer solution by Charlie (2017-06-17 18:49:13)
Difficulty: 2 of 5Under Candy lover (in Liars and Knights)
Posted on 2017-06-12 (3 Comments)
Solution solution by Charlie (2017-06-12 13:56:57)
Difficulty: 3 of 5Under A madness sequence (50 digits) (in Sequences)
Posted on 2017-06-11 (2 Comments)
Solution solution by Charlie (2017-06-11 15:58:14)
Difficulty: 2 of 5Under Add another line (in General)
Posted on 2017-06-10 (6 Comments)
re(4): solution a typo by Charlie (2017-06-11 14:52:18)
re(2): solution please correct- spoiler by Charlie (2017-06-11 10:04:49)
Solution solution by Charlie (2017-06-10 10:52:26)
Difficulty: 4 of 5Under A powerful anagram (in Word Problems)
Posted on 2017-06-09 (3 Comments)
Solution annotated computer listing by Charlie (2017-06-09 18:24:36)
Difficulty: 1 of 5Under 18 is not enough (in Sequences)
Posted on 2017-06-06 (2 Comments)
Solution solution by Charlie (2017-06-06 11:22:53)
Difficulty: 3 of 5Under Red vs Black Cuts (in Numbers)
Posted on 2017-06-05 (8 Comments)
Solution solution by Charlie (2017-06-05 10:43:06)
Difficulty: 3 of 5Under Ulam numbers (in Numbers)
Posted on 2017-06-03 (5 Comments)
re: The proof and the bonus by Charlie (2017-06-03 14:34:24)
Solution The proof and the bonus by Charlie (2017-06-03 14:31:38)
Difficulty: 3 of 5Under Memory Match Game (in Probability)
Posted on 2017-05-31 (9 Comments)
re: Question by Charlie (2017-06-02 04:57:16)
re(3): computer discovery by Charlie (2017-06-01 10:32:45)
re(2): computer discovery by Charlie (2017-06-01 08:58:32)
Solution computer discovery by Charlie (2017-05-31 16:20:20)
Difficulty: 3 of 5Under N dice (in Probability)
Posted on 2017-05-25 (3 Comments)
Solution computer aided solution by Charlie (2017-05-25 12:14:14)
Difficulty: 3 of 5Under Higher Powers of Eleven (in Numbers)
Posted on 2017-05-24 (4 Comments)
re: Analytic Solution by Charlie (2017-05-26 15:45:40)
Solution computer solution by Charlie (2017-05-24 11:32:24)
Difficulty: 2 of 5Under Four balls (in Probability)
Posted on 2017-05-19 (22 Comments)
re(4): Who's right by Charlie (2017-05-21 22:13:24)
Solution re(2): Who's right by Charlie (2017-05-21 16:37:54)
re: I agree with Brian by Charlie (2017-05-19 23:01:06)
Solution Solution by Charlie (2017-05-19 11:00:34)
Difficulty: 3 of 5Under Hands off! (in Weights and Scales)
Posted on 2017-05-16 (3 Comments)
Solution Two ways of looking at it both agree by Charlie (2017-05-16 10:36:39)
Difficulty: 3 of 5Under Inder Taneja's discovery (in Numbers)
Posted on 2017-05-11 (4 Comments)
re: How far could the list be extended? by Charlie (2017-05-12 13:50:00)
How far could the list be extended? by Charlie (2017-05-12 13:17:11)
A step beyond Taneja's list by Charlie (2017-05-11 22:42:29)
Some Thoughts some computer results by Charlie (2017-05-11 14:08:31)
Difficulty: 3 of 5Under One more line (in Logic)
Posted on 2017-05-10 (5 Comments)
Some Thoughts trivial solution? -- or is this not the solution? by Charlie (2017-05-10 10:32:24)
Difficulty: 3 of 5Under The length of the belt (in Geometry)
Posted on 2017-05-09 (6 Comments)
Solution solution by Charlie (2017-05-09 09:35:50)
Difficulty: 3 of 5Under No software allowed ! (in Numbers)
Posted on 2017-05-07 (9 Comments)
re(2): Solution by Charlie (2017-05-07 16:26:51)
Difficulty: 3 of 5Under All ten (in Numbers)
Posted on 2017-05-06 (1 Comments)
Solution computer solution by Charlie (2017-05-06 13:35:05)
Difficulty: 4 of 5Under Sum and Difference II (in Numbers)
Posted on 2017-05-05 (1 Comments)
Solution computer solution by Charlie (2017-05-05 13:47:42)
Difficulty: 3 of 5Under Pandigital + (in Probability)
Posted on 2017-05-03 (3 Comments)
Solution Analytic solution with Computer calculations by Charlie (2017-05-03 14:19:51)
Difficulty: 3 of 5Under The smallest non-conformist (in Numbers)
Posted on 2017-05-02 (3 Comments)
Solution with computer assistance by Charlie (2017-05-02 12:47:47)
Difficulty: 2 of 5Under A cent or more? (in Probability)
Posted on 2017-05-01 (2 Comments)
Some Thoughts conditional nature of the problem (spoilers) by Charlie (2017-05-01 08:56:54)
Difficulty: 3 of 5Under Smallest pandifibo number (in Numbers)
Posted on 2017-04-29 (1 Comments)
Solution UBASIC solution by Charlie (2017-04-29 13:57:59)
Difficulty: 2 of 5Under Prime with no prime digits (in Numbers)
Posted on 2017-04-25 (5 Comments)
BTW, why there are no 5's by Charlie (2017-04-28 15:38:57)
re(2): solution via computer -my remarks by Charlie (2017-04-26 11:45:50)
Solution solution via computer by Charlie (2017-04-25 09:18:01)
Difficulty: 3 of 5Under Liars can figure (in Liars and Knights)
Posted on 2017-04-24 (4 Comments)
re: I am between two answers (spoiler) by Charlie (2017-04-24 10:31:01)
Difficulty: 3 of 5Under Is it a conic? (in Geometry)
Posted on 2017-04-19 (7 Comments)
I guess my computer finding actually agrees, as do both others. by Charlie (2017-04-19 20:36:36)
Some Thoughts Computer findings -- probably wrong, based on previous posts by Charlie (2017-04-19 14:09:46)
Difficulty: 2 of 5Under A factorial in seconds (in Numbers)
Posted on 2017-04-18 (7 Comments)
Solution solution in under 200 seconds with calculator by Charlie (2017-04-18 09:21:01)
Difficulty: 2 of 5Under Polygon Overlap (in Geometry)
Posted on 2017-04-17 (2 Comments)
Solution solution by Charlie (2017-04-17 10:49:34)
Difficulty: 3 of 5Under Pandigital and square (in Numbers)
Posted on 2017-04-15 (6 Comments)
Solution computer solution by Charlie (2017-04-15 14:22:31)
Difficulty: 4 of 5Under Growth Potential (in Algorithms)
Posted on 2017-04-13 (4 Comments)
Solution Two proposed proofs by Charlie (2017-04-13 10:03:35)
Difficulty: 3 of 5Under Names in Boxes (in Logic)
Posted on 2017-04-09 (15 Comments)
re(3): Loops by Charlie (2017-04-12 14:41:51)
re: Loops by Charlie (2017-04-12 10:54:02)
Difficulty: 3 of 5Under Excellent numbers (in Numbers)
Posted on 2017-04-08 (3 Comments)
Solution computer solution: 6-, 8- and 10-digits by Charlie (2017-04-08 12:17:11)
Difficulty: 4 of 5Under The magnificent twelve (in Numbers)
Posted on 2017-04-07 (3 Comments)
Solution computer solution (spoiler) -- with a caveat on the restrictions by Charlie (2017-04-07 12:26:51)
Difficulty: 3 of 5Under Three mirrored multiplications (in Numbers)
Posted on 2017-04-02 (1 Comments)
Solution computer solution by Charlie (2017-04-02 12:40:21)
Difficulty: 3 of 5Under Prime power puzzle (in Just Math)
Posted on 2017-04-01 (9 Comments)
re(2): Half A proof by Charlie (2017-04-02 19:08:32)
re: computer so far by Charlie (2017-04-02 09:56:47)
computer so far by Charlie (2017-04-01 15:57:10)
Difficulty: 2 of 5Under Why is it D2? (in Numbers)
Posted on 2017-03-27 (4 Comments)
In the other spirit by Charlie (2017-03-27 11:15:37)
part 2 by Charlie (2017-03-27 10:41:15)
Solution A different answer by Charlie (2017-03-27 10:37:55)
Difficulty: 4 of 5Under 1 is one of them (in Numbers)
Posted on 2017-03-25 (2 Comments)
Solution computer solution by Charlie (2017-03-25 14:51:18)
Difficulty: 3 of 5Under True for nine and up (in Numbers)
Posted on 2017-03-24 (3 Comments)
Solution With some computer aid by Charlie (2017-03-24 11:00:45)
Difficulty: 2 of 5Under Elongated Pentagonal Orthocupola's vertices (in Shapes)
Posted on 2017-03-20 (3 Comments)
Solution re: solution by Charlie (2017-03-20 12:31:07)
Difficulty: 2 of 5Under Leave no stone unturned (in Logic)
Posted on 2017-03-19 (5 Comments)
re: Other cases by Charlie (2017-03-19 14:33:33)
Solution solution by Charlie (2017-03-19 13:32:00)
Difficulty: 4 of 5Under A rare palindrome (in Numbers)
Posted on 2017-03-18 (1 Comments)
Solution computer solution by Charlie (2017-03-18 13:48:46)
Difficulty: 4 of 5Under Primes and factors (in Numbers)
Posted on 2017-03-17 (2 Comments)
Solution computer solution carried beyond by Charlie (2017-03-17 10:23:55)
Difficulty: 3 of 5Under Same side story (in Probability)
Posted on 2017-03-16 (5 Comments)
Solution re: Corrected solution by Charlie (2017-03-29 10:46:12)
Difficulty: 2 of 5Under Integers and their sums of digits (in Just Math)
Posted on 2017-03-13 (3 Comments)
computer solution by Charlie (2017-03-19 11:38:14)
Difficulty: 2 of 5Under Facing each other (in Just Math)
Posted on 2017-03-07 (2 Comments)
Solution solution (spoiler) by Charlie (2017-03-07 09:39:18)
Difficulty: 3 of 5Under Only real x counted (in Probability)
Posted on 2017-03-01 (3 Comments)
Solution solution (spoiler) by Charlie (2017-03-01 10:52:32)
Difficulty: 2 of 5Under a KISS puzzle (in Just Math)
Posted on 2017-02-27 (4 Comments)
re: solution by Charlie (2021-08-02 18:44:47)
Solution solution by Charlie (2017-02-27 10:10:00)
Difficulty: 3 of 5Under Areas ratio (in Probability)
Posted on 2017-02-24 (1 Comments)
Solution solution by Charlie (2017-02-24 11:18:28)
Difficulty: 3 of 5Under Odds are ... (in Probability)
Posted on 2017-02-14 (11 Comments)
Higher numbers before overflow by Charlie (2017-02-14 11:42:28)
probabilities by Charlie (2017-02-14 11:34:26)
re: Argument (no math) by Charlie (2017-02-14 10:03:01)
Difficulty: 4 of 5Under Most words from your word (in Word Problems)
Posted on 2017-02-10 (10 Comments)
re: some computer results -- the program by Charlie (2017-02-10 23:31:27)
Some Thoughts some computer results by Charlie (2017-02-10 23:27:17)
Difficulty: 3 of 5Under Lies, truth, and logic (in Liars and Knights)
Posted on 2017-02-09 (2 Comments)
Solution Lots of solutions even between 20 and 40 by Charlie (2017-02-09 21:31:10)
Difficulty: 3 of 5Under A better approximate Pythagorean Theorem (in Calculus)
Posted on 2017-02-08 (1 Comments)
Some Thoughts heuristic estimate based on computer program by Charlie (2017-02-08 10:51:42)
Difficulty: 3 of 5Under Forward and Backward Word Values (in General)
Posted on 2017-02-07 (5 Comments)
Solution I don't know what truncated my previous list, but by Charlie (2017-02-08 08:28:57)
Solution computer solution (spoiler) by Charlie (2017-02-07 12:51:37)
Difficulty: 2 of 5Under Given VI, evaluate VII (in Sequences)
Posted on 2017-02-01 (1 Comments)
Solution computer solution (spoiler) by Charlie (2017-02-01 10:55:25)
Difficulty: 3 of 5Under Multiples with 3 (in Numbers)
Posted on 2017-01-31 (3 Comments)
Solution computer solution, taken beyond by Charlie (2017-01-31 12:59:29)
Difficulty: 2 of 5Under Opening your eyes (in Famous Riddles)
Posted on 2017-01-28 (3 Comments)
A Google search on the wording by Charlie (2017-01-29 12:49:59)
Difficulty: 4 of 5Under A false conjecture (in Numbers)
Posted on 2017-01-27 (7 Comments)
re: computer attempt by Charlie (2017-01-27 14:24:25)
Some Thoughts computer attempt by Charlie (2017-01-27 12:37:47)
Difficulty: 3 of 5Under 1,3,8 ...extend! (in Numbers)
Posted on 2017-01-26 (4 Comments)
Some Thoughts computer finding by Charlie (2017-01-26 14:38:53)
Difficulty: 2 of 5Under Ain't she clever? (in Just Math)
Posted on 2017-01-24 (1 Comments)
Solution solution given certain assumptions by Charlie (2017-01-24 11:15:52)
Difficulty: 3 of 5Under Topical Quotation V (in Word Problems)
Posted on 2017-01-18 (1 Comments)
Hints/Tips Hint by Charlie (2017-01-19 22:30:20)
Difficulty: 3 of 5Under An interesting recurrence (in Numbers)
Posted on 2017-01-17 (5 Comments)
computer solution by Charlie (2017-01-17 11:20:42)
Difficulty: 2 of 5Under Age Progression (in Numbers)
Posted on 2017-01-16 (3 Comments)
the cases -- to age 100 by Charlie (2017-01-16 16:01:35)
Difficulty: 3 of 5Under 2nd grade math (in Probability)
Posted on 2017-01-12 (4 Comments)
re: solution -- so about that math test by Charlie (2017-01-13 10:55:22)
re: solution -- simulation verification by Charlie (2017-01-12 21:38:09)
Solution solution by Charlie (2017-01-12 14:48:35)
Difficulty: 3 of 5Under (x−y)^ n = xy (in Just Math)
Posted on 2017-01-07 (2 Comments)
Some Thoughts computer exploration by Charlie (2017-01-07 14:46:42)
Difficulty: 2 of 5Under From Tangent to Circle (in Geometry)
Posted on 2017-01-04 (4 Comments)
Some Thoughts solution for part 2; outline for part 1 by Charlie (2017-01-04 13:38:09)
Difficulty: 2 of 5Under Counting brackets (in Just Math)
Posted on 2017-01-03 (1 Comments)
Solution computer exploration and solution by Charlie (2017-01-03 15:22:32)
Difficulty: 2 of 5Under Which is the biggest? (in Numbers)
Posted on 2017-01-02 (2 Comments)
Solution solution by Charlie (2017-01-02 10:43:01)
Difficulty: 4 of 5Under Congruent Incircles (in Geometry)
Posted on 2017-01-01 (6 Comments)
Solution numerical computer solution by Charlie (2017-01-01 12:43:06)
Difficulty: 4 of 5Under Skill or food? (in Numbers)
Posted on 2016-12-28 (5 Comments)
Some Thoughts re(3): Crazy for coconuts extra hint by Charlie (2016-12-29 10:39:38)
Solution software solution by Charlie (2016-12-28 11:29:28)
Difficulty: 3 of 5Under Who discovered the secret? (in Logic)
Posted on 2016-12-27 (4 Comments)
Solution solution by Charlie (2016-12-27 09:45:00)
Difficulty: 3 of 5Under Nothing's perfect. (in Sequences)
Posted on 2016-12-24 (1 Comments)
Some Thoughts computer exploration by Charlie (2016-12-26 08:56:34)
Difficulty: 3 of 5Under A chain of powers (in Sequences)
Posted on 2016-12-22 (1 Comments)
Some Thoughts computer observations by Charlie (2016-12-22 09:37:15)
Difficulty: 2 of 5Under Prime candidates (in Just Math)
Posted on 2016-12-20 (5 Comments)
Some Thoughts computer exploration by Charlie (2016-12-20 13:34:08)
Difficulty: 1 of 5Under Legally Blonde (in Liars and Knights)
Posted on 2016-12-19 (10 Comments)
Solution another way by Charlie (2016-12-19 10:31:34)
Difficulty: 3 of 5Under Traveling with Luggage (in Logic)
Posted on 2016-12-15 (2 Comments)
Solution computer solution (spoiler) by Charlie (2016-12-15 10:38:16)
Difficulty: 3 of 5Under Decimal and Binary Representation (in Numbers)
Posted on 2016-12-13 (3 Comments)
Solution computer solution (spoiler) by Charlie (2016-12-14 10:23:49)
re: hint based somewhat on computer findings by Charlie (2016-12-13 14:11:27)
Hints/Tips hint based somewhat on computer findings by Charlie (2016-12-13 10:31:41)
Difficulty: 3 of 5Under Pentagon Partitions (in Shapes)
Posted on 2016-12-11 (3 Comments)
re: A solution (spoiler) by Charlie (2016-12-12 11:19:42)
Difficulty: 3 of 5Under Gluing Cubes (in Shapes)
Posted on 2016-12-08 (1 Comments)
Solution proposed solution by Charlie (2016-12-08 10:28:20)
Difficulty: 4 of 5Under A ragman from 3 to 10 (in Word Problems)
Posted on 2016-12-07 (2 Comments)
9 and 10 by Charlie (2016-12-07 13:32:40)
computer solution for lengths 5 through 8 by Charlie (2016-12-07 11:08:02)
Difficulty: 2 of 5Under Moving Two Rooks (in Games)
Posted on 2016-12-06 (2 Comments)
Some Thoughts re: For the Win (spoiler) by Charlie (2016-12-06 15:37:11)
Difficulty: 3 of 5Under Four integers (in Numbers)
Posted on 2016-12-04 (8 Comments)
Solution extending the limit to 1700 (spoiler) by Charlie (2016-12-04 11:05:42)
Solution computer solution (spoiler) by Charlie (2016-12-04 11:01:08)
Difficulty: 3 of 5Under A biased random walk (in Probability)
Posted on 2016-12-01 (1 Comments)
Some Thoughts computer exploration by Charlie (2016-12-01 09:21:44)
Difficulty: 4 of 5Under 7+8=12 ?? (in Just Math)
Posted on 2016-11-30 (3 Comments)
Solution computer solution (spoiler) by Charlie (2016-11-30 10:29:30)
Difficulty: 2 of 5Under composite function (in Calculus)
Posted on 2016-11-29 (2 Comments)
Solution by graphing by Charlie (2016-11-29 13:59:19)
Difficulty: 3 of 5Under 26 out of 50 (in Just Math)
Posted on 2016-11-25 (10 Comments)
re: Inelegant proof? by Charlie (2016-11-28 08:05:55)
Difficulty: 2 of 5Under Prime repunits (in Numbers)
Posted on 2016-11-24 (6 Comments)
Some Thoughts computer exploration by Charlie (2016-11-24 17:59:10)
Difficulty: 3 of 5Under On the same floor (in Just Math)
Posted on 2016-11-22 (13 Comments)
re: the computer says - - my mistake by Charlie (2016-11-23 20:22:57)
Solution the computer says by Charlie (2016-11-23 20:14:31)
Solution re(2): How many...... g o o f by Charlie (2016-11-22 22:17:10)
Solution How many by Charlie (2016-11-22 11:23:45)
Difficulty: 3 of 5Under At least twice (in Numbers)
Posted on 2016-11-17 (5 Comments)
Solution below four trillion by Charlie (2016-11-17 15:18:11)
re(2): a star ... a hint by Charlie (2016-11-17 12:57:26)
Some Thoughts a start by Charlie (2016-11-17 09:31:01)
Difficulty: 3 of 5Under Maximizing the sum (in Numbers)
Posted on 2016-11-16 (4 Comments)
the program by Charlie (2016-11-16 10:22:00)
part b in more concise form by Charlie (2016-11-16 10:19:56)
list continued by Charlie (2016-11-16 10:15:12)
Solution e pluribus duo by Charlie (2016-11-16 10:13:46)
Difficulty: 2 of 5Under A radical problem (in Just Math)
Posted on 2016-11-15 (2 Comments)
Solution solution by Charlie (2016-11-15 10:39:36)
Difficulty: 1 of 5Under Don't be confused (in General)
Posted on 2016-11-14 (5 Comments)
Some Thoughts using a calculator by Charlie (2016-11-14 12:41:24)
Difficulty: 3 of 5Under Linear*Quadratic = Square (in Just Math)
Posted on 2016-11-12 (2 Comments)
Some Thoughts computer exploration by Charlie (2016-11-12 10:59:45)
Difficulty: 3 of 5Under 6 given, 2 wanted (in Sequences)
Posted on 2016-11-11 (5 Comments)
re(3): Hint #2: by Charlie (2016-11-14 07:53:59)
Solution re: Hint #2: by Charlie (2016-11-13 13:20:20)
Difficulty: 3 of 5Under 63 Division Decision (in Just Math)
Posted on 2016-11-10 (3 Comments)
Solution computer solution by Charlie (2016-11-10 12:42:32)
Difficulty: 4 of 5Under AABBCC and Perfect Square (in Just Math)
Posted on 2016-11-09 (6 Comments)
Solution computer solution by Charlie (2016-11-09 13:37:06)
Difficulty: 3 of 5Under Lucas Digits Look (in Just Math)
Posted on 2016-11-07 (21 Comments)
re: solution+ by Charlie (2016-11-07 10:59:44)
Solution solution+ by Charlie (2016-11-07 10:54:14)
Difficulty: 3 of 5Under Your conclusion requested (in Logic)
Posted on 2016-11-03 (9 Comments)
re(4): Answer .... to your questions by Charlie (2016-11-12 15:07:54)
re: Answer by Charlie (2016-11-10 15:43:37)
Some Thoughts My conclusion by Charlie (2016-11-03 09:22:32)
Difficulty: 3 of 5Under A peculiar triplet (in Just Math)
Posted on 2016-11-01 (7 Comments)
re(2): The triple without complete proof by Charlie (2016-11-01 13:42:44)
re: The triple without complete proof by Charlie (2016-11-01 13:40:17)
Difficulty: 3 of 5Under Equal Temperatures (in Just Math)
Posted on 2016-10-31 (6 Comments)
Solution re(2): computer solution by Charlie (2016-10-31 19:19:55)
re: No Subject by Charlie (2016-10-31 11:54:31)
Solution computer solution by Charlie (2016-10-31 11:53:55)
Difficulty: 3 of 5Under Reciprocal Period Poser (in Just Math)
Posted on 2016-10-29 (2 Comments)
Solution computer solution by Charlie (2016-10-29 10:49:24)
Difficulty: 4 of 5Under Symmetry helps! (in Just Math)
Posted on 2016-10-26 (7 Comments)
Some Thoughts computer exploration by Charlie (2016-10-26 12:08:23)
Difficulty: 3 of 5Under Figuring Forty-Nine and Sequence (in Sequences)
Posted on 2016-10-25 (2 Comments)
Some Thoughts No proof, but ... by Charlie (2016-10-25 09:18:28)
Difficulty: 3 of 5Under Totient Trial (in Just Math)
Posted on 2016-10-24 (2 Comments)
Solution computer solution by Charlie (2016-10-24 19:16:26)
Difficulty: 4 of 5Under Prime and Twice Square (in Just Math)
Posted on 2016-10-22 (4 Comments)
Some Thoughts re: A solution by Charlie (2016-10-22 15:54:41)
Difficulty: 3 of 5Under A little twist (in Just Math)
Posted on 2016-10-21 (4 Comments)
re(2): computer solution.....yes,but... by Charlie (2016-10-22 08:50:05)
Solution computer solution by Charlie (2016-10-21 14:46:29)
Difficulty: 3 of 5Under Dodecahedron Chance Determination (in Probability)
Posted on 2016-10-20 (6 Comments)
re(3): clarification by Charlie (2016-10-20 16:48:08)
re(2): clarification by Charlie (2016-10-20 16:04:43)
For 1 - 12 by Charlie (2016-10-20 15:30:10)
Solution solution for puzzle as originally given by Charlie (2016-10-20 15:13:11)
Difficulty: 3 of 5Under Why not marry? (in Logic)
Posted on 2016-10-19 (6 Comments)
Interesting variation in first cousin marriage in U.S. by Charlie (2016-10-19 14:37:22)
Some Thoughts Two ways. by Charlie (2016-10-19 08:55:46)
Difficulty: 3 of 5Under Positively Positive (in Just Math)
Posted on 2016-10-18 (10 Comments)
Some Thoughts findings by Charlie (2016-10-18 16:18:25)
Difficulty: 3 of 5Under Mismatch Muse (in Logic)
Posted on 2016-10-18 (1 Comments)
Solution proposed solution by Charlie (2016-10-18 10:58:05)
Difficulty: 3 of 5Under Prime and Six Settlement (in Just Math)
Posted on 2016-10-17 (4 Comments)
Solution solution by Charlie (2016-10-17 10:51:13)
Difficulty: 3 of 5Under get the real part of the problem (in Just Math)
Posted on 2016-10-16 (1 Comments)
Solution solution by Charlie (2016-10-16 11:13:54)
Difficulty: 4 of 5Under this is the range of my root (in Just Math)
Posted on 2016-10-14 (1 Comments)
Solution analysis then computation by Charlie (2016-10-14 15:41:10)
Difficulty: 3 of 5Under Phibobrick's dimensions (in Numbers)
Posted on 2016-10-14 (1 Comments)
Solution proposed solution by Charlie (2016-10-14 11:45:47)
Difficulty: 3 of 5Under River Cross Resolution (in Weights and Scales)
Posted on 2016-10-12 (1 Comments)
Solution computer solution by Charlie (2016-10-12 12:21:50)
Difficulty: 3 of 5Under Adding consecutive primes (in Just Math)
Posted on 2016-10-11 (1 Comments)
Solution computer solution by Charlie (2016-10-11 13:45:47)
Difficulty: 3 of 5Under Four Digit Arithmetic (in Just Math)
Posted on 2016-10-11 (2 Comments)
Solution computer solution by Charlie (2016-10-11 09:52:41)
Difficulty: 3 of 5Under Bridge Cross Baffle (in Logic)
Posted on 2016-10-10 (3 Comments)
Solution Wouldda, Coudda, Shouldda done it by computer by Charlie (2016-10-10 15:45:39)
Solution proposed solution by Charlie (2016-10-10 12:17:24)
Difficulty: 4 of 5Under polynomial problem 3 (in Just Math)
Posted on 2016-10-08 (2 Comments)
Solution D4? (spoiler) by Charlie (2016-10-08 09:32:36)
Difficulty: 2 of 5Under 2 sums modulo 7 (in Probability)
Posted on 2016-10-05 (3 Comments)
Solution re(2): some computed values by Charlie (2016-10-05 18:12:19)
re: some computed values by Charlie (2016-10-05 14:49:05)
Some Thoughts some computed values by Charlie (2016-10-05 14:43:35)
Difficulty: 3 of 5Under Additional solutions, please (in Just Math)
Posted on 2016-10-03 (3 Comments)
Solution re(2): computer solution -- final part by Charlie (2016-10-03 18:10:37)
Solution re: computer solution -- continued by Charlie (2016-10-03 18:09:13)
Solution computer solution by Charlie (2016-10-03 18:07:32)
Difficulty: 3 of 5Under Unit Cube Paint Undertaking (in Shapes)
Posted on 2016-09-28 (6 Comments)
Solution Considering all the possibilities by Charlie (2016-09-28 15:29:47)
re: Interesting. by Charlie (2016-09-28 12:23:22)
Difficulty: 4 of 5Under No data - just a weighing problem (in General)
Posted on 2016-09-27 (2 Comments)
re: My solution by Charlie (2016-09-27 16:02:30)
Difficulty: 3 of 5Under Numbers' quantifiers (in Logic)
Posted on 2016-09-23 (4 Comments)
re(2): a try by Charlie (2016-09-23 21:43:17)
Some Thoughts a try by Charlie (2016-09-23 15:48:50)
Difficulty: 2 of 5Under Nonnegative Sum Nuance (in Probability)
Posted on 2016-09-23 (1 Comments)
Solution solution by Charlie (2016-09-23 10:44:58)
Difficulty: 3 of 5Under A cyclic path (in Geometry)
Posted on 2016-09-21 (1 Comments)
Some Thoughts first guess by Charlie (2016-09-21 12:43:29)
Difficulty: 1 of 5Under Biting the Apple (in Tricks)
Posted on 2016-09-21 (3 Comments)
re: One way to do it -- close by Charlie (2016-09-21 11:15:35)
Difficulty: 3 of 5Under Real roots from three dice (in Probability)
Posted on 2016-09-20 (1 Comments)
Solution computer-aided solution by Charlie (2016-09-20 15:43:45)
Difficulty: 3 of 5Under Unbiased and Biased Choice (in Probability)
Posted on 2016-09-19 (1 Comments)
Solution solution by Charlie (2016-09-19 10:56:17)
Difficulty: 1 of 5Under Provide the next number (in Sequences)
Posted on 2016-09-18 (2 Comments)
Solution that, I guess, was hint enough by Charlie (2016-09-24 13:11:25)
Difficulty: 3 of 5Under GCD and LCM (in Just Math)
Posted on 2016-09-16 (1 Comments)
Solution solution by Charlie (2016-09-16 10:18:50)
Difficulty: 3 of 5Under Ascending Hexadecimal Digits (in Just Math)
Posted on 2016-09-15 (1 Comments)
Solution solution by Charlie (2016-09-15 10:08:44)
Difficulty: 3 of 5Under NegaTernary Nuance (in Algorithms)
Posted on 2016-09-14 (3 Comments)
Solution solution by Charlie (2016-09-14 11:01:03)
Difficulty: 3 of 5Under Duodecimal Pandigital Divisibility Device (in Algorithms)
Posted on 2016-09-13 (2 Comments)
Solution Choice of two algorithms by Charlie (2016-09-13 09:51:04)
Difficulty: 2 of 5Under Think twice (in Just Math)
Posted on 2016-09-12 (4 Comments)
Solution The apparent solution by Charlie (2016-09-12 10:33:10)
Difficulty: 2 of 5Under Finding the hidden digit (in Tricks)
Posted on 2016-09-09 (1 Comments)
Solution solution by Charlie (2016-09-09 10:54:07)
Difficulty: 3 of 5Under Dice Roll Resolution (in Probability)
Posted on 2016-09-08 (4 Comments)
re: Attempt at simulating part ii by Charlie (2016-09-08 13:56:17)
Attempt at simulating part ii by Charlie (2016-09-08 13:29:23)
Some Thoughts Actual part i simulation by Charlie (2016-09-08 13:11:57)
Some Thoughts simulation of a simpler case by Charlie (2016-09-08 12:10:15)
Difficulty: 3 of 5Under Counting ARATs (in Numbers)
Posted on 2016-09-07 (4 Comments)
Some Thoughts Corrected version for c<100,000 by Charlie (2016-09-07 12:57:02)
re: programming mistake; also need faster computer/programming language by Charlie (2016-09-07 10:41:16)
Some Thoughts programming mistake; also need faster computer/programming language by Charlie (2016-09-07 10:23:17)
Difficulty: 3 of 5Under Nineteenth Exponent Exposition (in Just Math)
Posted on 2016-09-06 (3 Comments)
Some Thoughts An analytic start and a calculator finish by Charlie (2016-09-06 15:42:04)
Difficulty: 2 of 5Under 1248 must be included (in Sequences)
Posted on 2016-09-06 (3 Comments)
Solution Brute force (computer solution) by Charlie (2016-09-06 10:19:42)
Difficulty: 3 of 5Under Form Finding From Solution (in Just Math)
Posted on 2016-09-05 (2 Comments)
Solution seems to be a solution by Charlie (2016-09-05 12:35:06)
Difficulty: 1 of 5Under Getting 189 (in Numbers)
Posted on 2016-09-05 (3 Comments)
Solution solution by Charlie (2016-09-05 10:05:38)
Difficulty: 3 of 5Under Tetra Anagram Trial (in Word Problems)
Posted on 2016-09-02 (4 Comments)
Some Thoughts Computer exploration and a guess by Charlie (2016-09-02 09:42:55)
Difficulty: 1 of 5Under Empty or fool ?? (in Logic)
Posted on 2016-09-01 (1 Comments)
Solution solution by Charlie (2016-09-01 12:57:44)
Difficulty: 3 of 5Under Divisibility Property (in Numbers)
Posted on 2016-08-31 (2 Comments)
Solution With software by Charlie (2016-08-31 11:12:32)
Difficulty: 3 of 5Under Near Fermat Nuance (in Just Math)
Posted on 2016-08-30 (2 Comments)
Solution computer solution by Charlie (2016-08-30 15:03:22)
Difficulty: 3 of 5Under Add missing letters (in Word Problems)
Posted on 2016-08-30 (3 Comments)
re: answer by Charlie (2016-08-31 07:43:17)
Difficulty: 3 of 5Under Random Chess Pieces Poser (in Probability)
Posted on 2016-08-29 (6 Comments)
Solution re(3): computer aided solution (corrected answer) by Charlie (2016-08-30 21:30:02)
re(3): computer aided solution by Charlie (2016-08-30 19:58:28)
re(2): computer aided solution by Charlie (2016-08-30 07:45:29)
computer aided solution by Charlie (2016-08-29 16:31:03)
Difficulty: 3 of 5Under Which is greater? (in Just Math)
Posted on 2016-08-28 (3 Comments)
Solution computer solution (spoiler) by Charlie (2016-08-28 10:29:43)
Difficulty: 3 of 5Under All rational numbers in (in Sequences)
Posted on 2016-08-26 (10 Comments)
re(2): From N/D to n @ jer & Charlie by Charlie (2016-08-29 07:27:49)
re: From N/D to n by Charlie (2016-08-28 22:27:57)
Difficulty: 3 of 5Under Powers of 3 (in Numbers)
Posted on 2016-08-25 (5 Comments)
Some Thoughts Computer exploration by Charlie (2016-08-25 14:11:11)
Difficulty: 2 of 5Under Labeling Minimum (in Weights and Scales)
Posted on 2016-08-25 (4 Comments)
re(2): Solution by Charlie (2016-08-25 14:08:39)
Difficulty: 3 of 5Under Eight Points (in Probability)
Posted on 2016-08-24 (3 Comments)
Just for curiosity, random points in a square by Charlie (2016-08-25 09:34:10)
Solution simulation by Charlie (2016-08-24 18:30:39)
Difficulty: 2 of 5Under Business is business (in Word Problems)
Posted on 2016-08-24 (7 Comments)
Solution re: Hint for previous solvers. by Charlie (2016-08-24 10:53:52)
Solution A short couplet by Charlie (2016-08-24 08:32:10)
Difficulty: 2 of 5Under Murder Muse Resolution (in Riddles)
Posted on 2016-08-23 (1 Comments)
Solution solution by Charlie (2016-08-23 12:37:08)
Difficulty: 3 of 5Under Year from Ratio (in General)
Posted on 2016-08-22 (3 Comments)
Solution re: No Subject by Charlie (2016-08-23 19:52:39)
Difficulty: 2 of 5Under Estimate a percentage (in Numbers)
Posted on 2016-08-22 (6 Comments)
Solution potential solution by Charlie (2016-08-22 10:03:49)
Difficulty: 3 of 5Under Covering a Cube with Strips (in Shapes)
Posted on 2016-08-18 (3 Comments)
Solution solution by Charlie (2016-08-18 17:03:06)
Difficulty: 3 of 5Under Guessing your birthdate (in Just Math)
Posted on 2016-08-18 (4 Comments)
re: part a by Charlie (2016-08-19 22:20:11)
Some Thoughts part b is easiest with a computer; part a not so much by Charlie (2016-08-18 11:05:32)
Difficulty: 3 of 5Under Summing up (in Sequences)
Posted on 2016-08-17 (2 Comments)
Solution solution by Charlie (2016-08-17 14:33:35)
Difficulty: 4 of 5Under 4 groups of 4 (in Word Problems)
Posted on 2016-08-16 (8 Comments)
re(2): with computer assistance by Charlie (2016-08-16 19:25:11)
Solution with computer assistance by Charlie (2016-08-16 13:48:36)
Some Thoughts first thoughts by Charlie (2016-08-16 13:05:33)
Difficulty: 2 of 5Under 240 divisors (in Just Math)
Posted on 2016-08-15 (2 Comments)
Solution Analytic guesses plus computer verification (spoiler) by Charlie (2016-08-15 10:27:39)
Difficulty: 3 of 5Under 1-2-3-4 Square (in Geometry)
Posted on 2016-08-12 (3 Comments)
Solution solutions by Charlie (2016-08-12 10:38:54)
Difficulty: 2 of 5Under Form 21 n Times II (in Numbers)
Posted on 2016-08-11 (6 Comments)
re: Full solution - SPOILER by Charlie (2016-08-11 09:06:28)
Difficulty: 3 of 5Under Find additional pairs (in Just Math)
Posted on 2016-08-08 (5 Comments)
re: computer solution by Charlie (2016-08-08 22:19:57)
Solution computer solution by Charlie (2016-08-08 22:12:14)
Difficulty: 3 of 5Under Binomial GCDs (in Just Math)
Posted on 2016-08-08 (3 Comments)
Solution Heuristic solution by Charlie (2016-08-08 14:34:12)
Difficulty: 2 of 5Under Visiting Toronto (in Numbers)
Posted on 2016-08-05 (1 Comments)
Solution computer solution by Charlie (2016-08-10 07:56:26)
Difficulty: 3 of 5Under Remainder Resolution from Multiple (in Just Math)
Posted on 2016-08-04 (5 Comments)
Solution computer solution by Charlie (2016-08-04 10:43:25)
Difficulty: 3 of 5Under Pandigital Multiples of 99 (in Numbers)
Posted on 2016-08-03 (2 Comments)
Solution solution by Charlie (2016-08-03 14:19:15)
Difficulty: 3 of 5Under Quadratic and Linear (in Just Math)
Posted on 2016-08-03 (2 Comments)
Solution computer solution by Charlie (2016-08-03 10:32:48)
Difficulty: 3 of 5Under Pentagon and Acute Probability (in Probability)
Posted on 2016-08-02 (1 Comments)
Solution solution by Charlie (2016-08-02 11:54:27)
Difficulty: 3 of 5Under Staggering Digits (in Just Math)
Posted on 2016-07-28 (4 Comments)
re: Solution by Charlie (2016-07-28 15:20:11)
Solution needed a computer by Charlie (2016-07-28 15:12:04)
Difficulty: 3 of 5Under A surprising prime gap (in Numbers)
Posted on 2016-07-27 (8 Comments)
re(5): My solution by Charlie (2016-08-01 07:57:10)
re(3): My solution by Charlie (2016-07-31 18:45:10)
re: My solution by Charlie (2016-07-30 09:13:56)
Solution computer solution by Charlie (2016-07-27 16:45:07)
Difficulty: 3 of 5Under A chain of command (in Just Math)
Posted on 2016-07-26 (2 Comments)
Solution solution if there's no trick by Charlie (2016-07-26 13:35:10)
Difficulty: 2 of 5Under Go back or double (in Sequences)
Posted on 2016-07-25 (5 Comments)
re: An uncertain shorthand for part II by Charlie (2016-07-26 15:04:35)
part 1 by Charlie (2016-07-25 10:17:43)
Difficulty: 3 of 5Under Seventh Term Settlement (in Sequences)
Posted on 2016-07-22 (10 Comments)
re: answer by Charlie (2016-07-22 10:39:59)
Solution computer solution by Charlie (2016-07-22 10:34:02)
Difficulty: 2 of 5Under Cute numbers (in Numbers)
Posted on 2016-07-21 (5 Comments)
re(2): short review.....augmented by Charlie (2016-07-22 07:45:36)
Solution computer solution (spoiler) by Charlie (2016-07-21 10:36:42)
Difficulty: 3 of 5Under Smallest Multiple of 99 (in Just Math)
Posted on 2016-07-19 (3 Comments)
Some Thoughts Seems to be by Charlie (2016-07-19 14:51:57)
Difficulty: 2 of 5Under Two items to get sqrt of 2 (in Science)
Posted on 2016-07-19 (5 Comments)
Solution another way by Charlie (2016-07-19 10:42:59)
Difficulty: 3 of 5Under The First Repeat (in Probability)
Posted on 2016-07-18 (5 Comments)
re: answers by Charlie (2016-07-18 15:13:55)
Solution solution by Charlie (2016-07-18 15:04:40)
Difficulty: 2 of 5Under Denver is not the issue (in Word Problems)
Posted on 2016-07-18 (5 Comments)
Solution re(2): Strong clues from A.A.Euler. (spoiler) by Charlie (2016-07-19 08:01:57)
Hints/Tips Strong clues from A.A.Euler. by Charlie (2016-07-18 11:33:10)
Difficulty: 3 of 5Under Cube Count Calculation (in Shapes)
Posted on 2016-07-13 (1 Comments)
Solution solution by Charlie (2016-07-13 12:55:10)
Difficulty: 3 of 5Under Two Digit Diameter Trial (in Shapes)
Posted on 2016-07-11 (4 Comments)
Solution computer solution (spoiler) by Charlie (2016-07-11 15:31:47)
Difficulty: 3 of 5Under Multiple Harshad Numbers (in Numbers)
Posted on 2016-07-10 (12 Comments)
re(3): Moby Dick has been captured -- part 2 solved by Charlie (2016-07-14 15:10:48)
re(2): Moby Dick has been captured -- part 2 solved by Charlie (2016-07-14 15:04:28)
re: phase 24 output continued by Charlie (2016-07-14 11:19:39)
phase 24 output by Charlie (2016-07-14 11:18:15)
Some Thoughts Moby Dick has been captured -- part 2 solved by Charlie (2016-07-14 11:08:43)
re: The method for part 2 by Charlie (2016-07-10 21:13:38)
re(2): part one by Charlie (2016-07-10 15:00:45)
Some Thoughts The method for part 2 by Charlie (2016-07-10 14:27:26)
re: part one by Charlie (2016-07-10 13:06:36)
Some Thoughts part one by Charlie (2016-07-10 12:43:17)
Difficulty: 4 of 5Under Amicable pair generator (in Numbers)
Posted on 2016-07-08 (2 Comments)
Some Thoughts Computer exploration by Charlie (2016-07-08 15:33:47)
Difficulty: 3 of 5Under Disk Toss on a Grid (in Probability)
Posted on 2016-07-08 (4 Comments)
re: Three answers (spoiler) by Charlie (2016-07-08 20:46:20)
Solution solution by Charlie (2016-07-08 11:17:15)
Difficulty: 4 of 5Under Two out of seven (in Numbers)
Posted on 2016-07-07 (2 Comments)
Solution computer solution (spoiler) by Charlie (2016-07-07 15:29:29)
Difficulty: 3 of 5Under Not too high, not too low (in Just Math)
Posted on 2016-07-06 (3 Comments)
Solution my solution by Charlie (2016-07-06 14:52:48)
Difficulty: 3 of 5Under Find Counterexamples (in Numbers)
Posted on 2016-07-06 (1 Comments)
Some Thoughts computer solution to part 1 by Charlie (2016-07-06 10:12:59)
Difficulty: 3 of 5Under Sequence starting with 30 (in Numbers)
Posted on 2016-07-05 (3 Comments)
Some Thoughts program; research; program by Charlie (2016-07-05 14:43:03)
Difficulty: 3 of 5Under Quadrilateral Area Query 2 (in Shapes)
Posted on 2016-07-03 (3 Comments)
Solution another approach by Charlie (2016-07-03 09:40:53)
Difficulty: 3 of 5Under Pentagonal triple triangles (in Geometry)
Posted on 2016-07-01 (4 Comments)
re: computer method (the part that wouldn't fit) by Charlie (2016-07-01 10:14:21)
Some Thoughts computer method by Charlie (2016-07-01 10:13:19)
Difficulty: 3 of 5Under 4 numbers make 5 squares (in Numbers)
Posted on 2016-06-30 (10 Comments)
Solution re(2): Row of text ok? -- solutions found by Charlie (2016-07-01 14:09:05)
re: Row of text ok? by Charlie (2016-07-01 13:55:57)
re(2): A (bad?) guess by Charlie (2016-07-01 11:02:44)
re: A (bad?) guess by Charlie (2016-07-01 10:55:04)
re(2): computer solution and discussion by Charlie (2016-06-30 22:36:30)
Solution computer solution and discussion by Charlie (2016-06-30 11:20:00)
Difficulty: 3 of 5Under Square Temperatures (in Just Math)
Posted on 2016-06-29 (3 Comments)
Solution Assuming... by Charlie (2016-06-29 16:27:56)
Difficulty: 1 of 5Under Simple number trick (in Numbers)
Posted on 2016-06-29 (5 Comments)
Some Thoughts comment by Charlie (2016-06-29 10:13:15)
Difficulty: 3 of 5Under Pandigital pattern (in Numbers)
Posted on 2016-06-28 (2 Comments)
Some Thoughts Computer exploration by Charlie (2016-06-28 10:16:49)
Difficulty: 3 of 5Under Skip to 4th power (in Numbers)
Posted on 2016-06-27 (4 Comments)
Some Thoughts convincing but not a proof by Charlie (2016-06-27 19:57:01)
Difficulty: 3 of 5Under Square Sum in Pairs (in Just Math)
Posted on 2016-06-27 (2 Comments)
Solution computer solution by Charlie (2016-06-27 13:57:18)
Difficulty: 3 of 5Under Sum Number and Reversal (in Just Math)
Posted on 2016-06-24 (5 Comments)
Solution computer assisted by Charlie (2016-06-24 14:03:57)
Difficulty: 3 of 5Under Find From Four 2 (in Just Math)
Posted on 2016-06-23 (4 Comments)
Solution computer solution by Charlie (2016-06-23 17:02:39)
Difficulty: 2 of 5Under Capital City Conclusion 2 (in Word Problems)
Posted on 2016-06-23 (4 Comments)
Excluded because of non-sovereignty by Charlie (2016-06-23 10:21:18)
Difficulty: 3 of 5Under 2016 and Perfect Square Puzzle (in Just Math)
Posted on 2016-06-22 (4 Comments)
Solution computer solution by Charlie (2016-06-22 16:15:15)
Difficulty: 3 of 5Under Celsius- A Fahrenheit Multiple? (in Just Math)
Posted on 2016-06-21 (7 Comments)
re: And another.. by Charlie (2016-06-22 12:42:25)
Solution five solutions by Charlie (2016-06-22 08:16:39)
re: No Subject - looks like I solved the problem wrong way around by Charlie (2016-06-22 07:54:31)
No Subject by Charlie (2016-06-21 15:23:03)
Difficulty: 3 of 5Under Three vowels (in Word Problems)
Posted on 2016-06-21 (4 Comments)
A lot of computer work... by Charlie (2016-06-21 10:32:32)
Difficulty: 3 of 5Under Find the killer (in Liars and Knights)
Posted on 2016-06-20 (5 Comments)
Solution solution by Charlie (2016-06-20 18:46:16)
Difficulty: 2 of 5Under Circle cuts (in Shapes)
Posted on 2016-06-20 (1 Comments)
Solution Squaring the circle... by Charlie (2016-06-20 10:47:16)
Difficulty: 3 of 5Under Hexadecimal Hinder (in Probability)
Posted on 2016-06-19 (6 Comments)
Solution re: part (i) solution --- correction by Charlie (2016-06-20 21:56:20)
Solution part (iv) solution by Charlie (2016-06-20 10:37:02)
Solution part (iii) solution by Charlie (2016-06-20 09:01:51)
Some Thoughts Simulations for all parts by Charlie (2016-06-19 21:25:11)
Solution part (ii) solution by Charlie (2016-06-19 18:44:57)
Some Thoughts part (i) solution by Charlie (2016-06-19 15:07:44)
Difficulty: 3 of 5Under Roman Numeral and Letter Insertion (in Word Problems)
Posted on 2016-06-17 (2 Comments)
Some Thoughts computer findings by Charlie (2016-06-17 14:27:27)
Difficulty: 3 of 5Under Digit Finding with Hexadecimal Fibonacci (in Just Math)
Posted on 2016-06-16 (3 Comments)
Solution computer solution by Charlie (2016-06-16 15:09:16)
Difficulty: 3 of 5Under A transpogram (in Word Problems)
Posted on 2016-06-16 (1 Comments)
Solution solution by Charlie (2016-06-16 09:53:34)
Difficulty: 4 of 5Under Progressive probability (in Probability)
Posted on 2016-06-15 (1 Comments)
Some Thoughts computer exploration - solution for first part only by Charlie (2016-06-15 15:57:28)
Difficulty: 2 of 5Under Comparing two events (in Probability)
Posted on 2016-06-15 (3 Comments)
re: solution by Charlie (2016-06-16 09:47:20)
Solution spoiler -- try it yourself first by Charlie (2016-06-16 09:43:00)
Difficulty: 3 of 5Under Objective: Integer! (in Geometry)
Posted on 2016-06-14 (4 Comments)
re: Interesting by Charlie (2016-06-15 07:44:09)
Solution computer solution by Charlie (2016-06-14 15:43:05)
Difficulty: 3 of 5Under Arithmetic Product Puzzle 2 (in Sequences)
Posted on 2016-06-14 (2 Comments)
Solution computer solution by Charlie (2016-06-14 09:55:53)
Difficulty: 3 of 5Under Hundred Product Hinder (in Just Math)
Posted on 2016-06-13 (2 Comments)
Solution computer solution (seems unique) by Charlie (2016-06-13 15:15:33)
Difficulty: 4 of 5Under Squared halves (in Numbers)
Posted on 2016-06-10 (1 Comments)
Solution computer solution (spoiler) by Charlie (2016-06-10 15:02:02)
Difficulty: 3 of 5Under Term Finding with Floor (in Sequences)
Posted on 2016-06-09 (3 Comments)
Solution computer solution (spoiler) by Charlie (2016-06-09 10:31:50)
Difficulty: 3 of 5Under Matching pegs (in Probability)
Posted on 2016-06-08 (2 Comments)
step-by-step diffusion and coalescence of the probabilities by Charlie (2016-06-08 13:27:03)
Solution computer assisted solution by Charlie (2016-06-08 13:19:16)
Difficulty: 3 of 5Under Twice 2 products (in Numbers)
Posted on 2016-06-07 (2 Comments)
Solution re: Exhausted Spoiler -- doubling the answers by Charlie (2016-06-07 13:35:34)
Difficulty: 3 of 5Under One of these things is not like the others.. (in Word Problems)
Posted on 2016-06-07 (5 Comments)
re: No Subject by Charlie (2016-06-07 13:37:41)
Difficulty: 3 of 5Under Random Sum Resolution (in Probability)
Posted on 2016-06-06 (1 Comments)
Solution solution by Charlie (2016-06-06 10:51:52)
Difficulty: 3 of 5Under Three expressions - same value (in Just Math)
Posted on 2016-06-02 (3 Comments)
Solution computer assisted solution by Charlie (2016-06-02 15:25:05)
Difficulty: 2 of 5Under No fours on my odometer (in Just Math)
Posted on 2016-06-02 (2 Comments)
re: Possible solution. by Charlie (2016-06-02 09:09:32)
Difficulty: 3 of 5Under King on the run (in Just Math)
Posted on 2016-06-01 (5 Comments)
Solution computer assisted solution by Charlie (2016-06-01 15:37:46)
Difficulty: 3 of 5Under Edge problem (in Geometry)
Posted on 2016-05-31 (3 Comments)
Solution solution after a false assumption by Charlie (2016-05-31 16:07:57)
Difficulty: 2 of 5Under Latin verse (in Word Problems)
Posted on 2016-05-31 (5 Comments)
Solution re: Very ancient latin by Charlie (2016-05-31 16:12:36)
Difficulty: 4 of 5Under List the expressionist numbers (in Numbers)
Posted on 2016-05-30 (10 Comments)
Solution Part 1 down to 67 entries after eliminating the spurious by Charlie (2016-06-02 07:31:32)
Solution Part 1 redone allowing unary negation by Charlie (2016-06-01 08:04:18)
Supplement to part 1 list by Charlie (2016-05-31 08:40:44)
re: Computer solutions by Charlie (2016-05-31 07:39:57)
Solution Part 2 and Bonus by Charlie (2016-05-31 07:31:18)
Solution Computer "solution" part 1 -- no guarantee of completeness by Charlie (2016-05-31 07:27:45)
Difficulty: 4 of 5Under Finding the fixes (in Numbers)
Posted on 2016-05-29 (4 Comments)
re: computer solution and discussion by Charlie (2016-05-29 11:37:40)
re: Stop me before I replace again! by Charlie (2016-05-29 11:27:58)
Solution computer solution and discussion by Charlie (2016-05-29 11:22:38)
Difficulty: 4 of 5Under Power of 2 (in Numbers)
Posted on 2016-05-27 (6 Comments)
Solution computer solution by Charlie (2016-05-27 15:12:52)
Difficulty: 3 of 5Under Mark's itinerary (in Probability)
Posted on 2016-05-26 (5 Comments)
re: An by Charlie (2016-05-29 14:06:54)
Solution Analytic + Simulation + Probabilistic by Charlie (2016-05-26 14:22:24)
Difficulty: 3 of 5Under 2016 and Simultaneous Settlement (in Just Math)
Posted on 2016-05-26 (2 Comments)
Solution computer solution (spoiler) by Charlie (2016-05-26 10:55:52)
Difficulty: 3 of 5Under Duodecimal Element Sum Settlement (in Just Math)
Posted on 2016-05-25 (3 Comments)
Solution working in decimal, same answer by Charlie (2016-05-25 14:22:58)
Difficulty: 3 of 5Under Colored Candy Choice (in Probability)
Posted on 2016-05-25 (10 Comments)
re(3): Second part by Charlie (2016-05-26 15:13:50)
re: Second part by Charlie (2016-05-25 21:05:17)
re(2): No Subject @ Charlie by Charlie (2016-05-25 20:24:18)
Solution No Subject by Charlie (2016-05-25 11:37:33)
Difficulty: 3 of 5Under Wanted: gifted numbers (in Numbers)
Posted on 2016-05-24 (1 Comments)
Solution computer assisted solution by Charlie (2016-05-24 16:06:42)
Difficulty: 3 of 5Under Projection Ponder (in Shapes)
Posted on 2016-05-23 (2 Comments)
Solution solution (if I got the algebra right) by Charlie (2016-05-23 15:29:15)
Difficulty: 4 of 5Under Gambler's policy (in Probability)
Posted on 2016-05-20 (2 Comments)
Solution computer assisted solution by Charlie (2016-05-20 17:48:05)
Difficulty: 3 of 5Under Four Digit Combination Conclusion (in Sequences)
Posted on 2016-05-18 (2 Comments)
Solution solution by Charlie (2016-05-18 19:43:55)
Difficulty: 2 of 5Under Grid exercise (in Just Math)
Posted on 2016-05-18 (2 Comments)
Solution 2-step method by Charlie (2016-05-18 19:49:08)
Difficulty: 2 of 5Under A square problem (in Just Math)
Posted on 2016-05-17 (1 Comments)
Solution solution by Charlie (2016-05-17 12:45:44)
Difficulty: 3 of 5Under AABBCCDD and Perfect Square (in Just Math)
Posted on 2016-05-16 (3 Comments)
Solution computer solutions by Charlie (2016-05-16 16:23:10)
Difficulty: 3 of 5Under Two distinct questions (in Just Math)
Posted on 2016-05-13 (1 Comments)
Solution solution by Charlie (2016-05-13 14:46:05)
Difficulty: 4 of 5Under From challenge to change (in Word Problems)
Posted on 2016-05-12 (4 Comments)
Some Thoughts 70% of them by Charlie (2016-05-12 14:19:12)
Difficulty: 3 of 5Under Divisible by 198 (in Just Math)
Posted on 2016-05-12 (2 Comments)
Solution computer solution by Charlie (2016-05-12 10:05:07)
Difficulty: 3 of 5Under Icosahedron addressed (in Geometry)
Posted on 2016-05-11 (2 Comments)
Some Thoughts The area and a start toward the volume by Charlie (2016-05-11 14:41:18)
Difficulty: 3 of 5Under Sum ArcTan Limit (in Calculus)
Posted on 2016-05-11 (6 Comments)
re(3): summing the series via computer by Charlie (2016-05-11 14:55:30)
re(2): summing the series via computer by Charlie (2016-05-11 14:45:20)
Solution summing the series via computer by Charlie (2016-05-11 10:19:23)
Difficulty: 3 of 5Under Tanya's puzzle (in Logic)
Posted on 2016-05-10 (10 Comments)
Some Thoughts re(4): could be by Charlie (2016-05-11 07:32:24)
Some Thoughts could be by Charlie (2016-05-10 14:00:22)
Difficulty: 3 of 5Under Make it true (in Numbers)
Posted on 2016-05-09 (5 Comments)
Solution via computer by Charlie (2016-05-09 15:45:58)
Solution Quick solution by Charlie (2016-05-09 13:44:23)
Difficulty: 2 of 5Under Puzzle Calendar (in General)
Posted on 2016-05-09 (5 Comments)
re(2): Solution -- solution is posted by Charlie (2016-05-10 08:29:46)
Difficulty: 3 of 5Under First Term Finding (in Sequences)
Posted on 2016-05-04 (2 Comments)
Solution computer solution by Charlie (2016-05-04 13:13:53)
Difficulty: 3 of 5Under LCM and GCD Equation (in Just Math)
Posted on 2016-05-03 (162 Comments)
Solution computer solution by Charlie (2016-05-03 19:05:37)
Difficulty: 3 of 5Under Base Baffle (in Just Math)
Posted on 2016-05-02 (2 Comments)
Solution solution by Charlie (2016-05-02 14:35:06)
Difficulty: 3 of 5Under Quadratic and Perfect Square Query (in Just Math)
Posted on 2016-04-30 (2 Comments)
Solution computer exploration -- probable spoiler by Charlie (2016-04-30 09:05:23)
Difficulty: 3 of 5Under LCM and GCD Sequence (in Sequences)
Posted on 2016-04-29 (1 Comments)
Some Thoughts probable solution (spoiler) by Charlie (2016-04-29 11:30:46)
Difficulty: 2 of 5Under One and only (in Numbers)
Posted on 2016-04-28 (4 Comments)
re: spoiler by Charlie (2016-04-28 10:39:05)
Solution computer assisted solution by Charlie (2016-04-28 10:34:13)
Difficulty: 3 of 5Under M.G.'s wit (in Just Math)
Posted on 2016-04-27 (3 Comments)
Solution Dimensional Analysis by Charlie (2016-04-27 14:29:43)
Difficulty: 2 of 5Under Think it over (in Logic)
Posted on 2016-04-27 (6 Comments)
Some Thoughts Solution to the distractor by Charlie (2016-04-27 10:35:42)
Difficulty: 3 of 5Under No Carry Nuance (in Just Math)
Posted on 2016-04-26 (3 Comments)
Solution Part 1 by Charlie (2016-04-26 13:56:38)
Difficulty: 3 of 5Under 2 diagonal sums (in Just Math)
Posted on 2016-04-26 (1 Comments)
Solution solution by Charlie (2016-04-26 10:09:11)
Difficulty: 2 of 5Under Draw a Line to Partition the Grid (in General)
Posted on 2016-04-25 (7 Comments)
re(3): Strange by Charlie (2016-04-29 12:52:15)
re: Strange by Charlie (2016-04-29 07:55:06)
re: Solution? by Charlie (2016-04-26 11:42:47)
Difficulty: 3 of 5Under Cubic Diophantine Conclusion (in Just Math)
Posted on 2016-04-22 (9 Comments)
Some Thoughts computer exploration by Charlie (2016-04-22 11:11:58)
Difficulty: 3 of 5Under Eight Digit Product Poser (in Just Math)
Posted on 2016-04-20 (1 Comments)
Solution with a little help from a Mintoris Basic program (Android) by Charlie (2016-04-20 13:46:12)
Difficulty: 3 of 5Under Could you please repeat that? (in Probability)
Posted on 2016-04-20 (4 Comments)
re(2): Laying out the possibilities by Charlie (2016-04-20 14:53:16)
Solution Laying out the possibilities by Charlie (2016-04-20 10:36:25)
Difficulty: 3 of 5Under Asteroid walk (in General)
Posted on 2016-04-19 (8 Comments)
Question question by Charlie (2016-04-19 22:46:24)
Difficulty: 3 of 5Under No Equal Weighings (in Weights and Scales)
Posted on 2016-04-18 (5 Comments)
re: computer solution -- sampling of every 1000th valid sequence by Charlie (2016-04-18 15:10:27)
Solution computer solution by Charlie (2016-04-18 14:55:28)
Difficulty: 3 of 5Under An educated guess (in Probability)
Posted on 2016-04-18 (7 Comments)
Some Thoughts a new simulation by Charlie (2016-04-18 14:44:30)
Some Thoughts preliminary simulation by Charlie (2016-04-18 09:01:29)
Some Thoughts Preliminary guess by Charlie (2016-04-18 08:44:45)
Difficulty: 3 of 5Under Mean Integer Illation (in Just Math)
Posted on 2016-04-17 (1 Comments)
computer solution by Charlie (2016-04-17 15:30:22)
Difficulty: 3 of 5Under Electrical Cube 3 (in Science)
Posted on 2016-04-15 (2 Comments)
Solution solution by Charlie (2016-04-15 19:29:21)
Difficulty: 3 of 5Under Rectangular Crease Resolution (in Shapes)
Posted on 2016-04-15 (2 Comments)
Solution GSP says (7 significant figures) by Charlie (2016-04-15 09:52:15)
Difficulty: 3 of 5Under Three ways - same sum (in Numbers)
Posted on 2016-04-14 (3 Comments)
Solution computer solution by Charlie (2016-04-14 09:42:14)
Difficulty: 3 of 5Under Complex Ratio and Number Resolution (in Sequences)
Posted on 2016-04-13 (2 Comments)
Solution computer assisted solution by Charlie (2016-04-13 14:37:15)
Difficulty: 3 of 5Under 1 to 9 concatenation (in Numbers)
Posted on 2016-04-12 (8 Comments)
Solution computer solution by Charlie (2016-04-12 14:58:24)
Difficulty: 3 of 5Under 2 equal sums (in Just Math)
Posted on 2016-04-11 (3 Comments)
re: computer exploration -- possible spoiler by Charlie (2016-04-11 22:44:38)
Some Thoughts computer exploration -- possible spoiler by Charlie (2016-04-11 15:49:43)
Difficulty: 2 of 5Under Extreme Palindrome Exercise (in Just Math)
Posted on 2016-04-11 (3 Comments)
Solution agree by Charlie (2016-04-11 10:16:10)
Difficulty: 4 of 5Under A Pythagorean triangle (in Numbers)
Posted on 2016-04-08 (5 Comments)
Solution computer solution by Charlie (2016-04-08 19:21:59)
Difficulty: 3 of 5Under Square Settlement With Digits (in Just Math)
Posted on 2016-04-07 (2 Comments)
Solution computer solution by Charlie (2016-04-07 15:40:15)
Difficulty: 2 of 5Under Tenacious Divisibility Treat (in Just Math)
Posted on 2016-04-06 (10 Comments)
broll's interpretation is correct by Charlie (2016-04-07 10:41:07)
solution by Charlie (2016-04-06 10:14:35)
Difficulty: 2 of 5Under Year Yearn 3 (in Just Math)
Posted on 2016-04-05 (1 Comments)
Solution computer solution by Charlie (2016-04-05 10:22:40)
Difficulty: 3 of 5Under Odd and Even 3 (in Just Math)
Posted on 2016-04-04 (6 Comments)
re(3): My answers (with and without leading zeros) by Charlie (2016-04-05 22:28:01)
re: My answers (with and without leading zeros) by Charlie (2016-04-05 13:33:52)
Solution computer solution by Charlie (2016-04-04 19:14:42)
Difficulty: 2 of 5Under Find this number (in Numbers)
Posted on 2016-04-04 (1 Comments)
Solution computer solution by Charlie (2016-04-04 11:21:07)
Difficulty: 2 of 5Under Look for 3 sevens (in Numbers)
Posted on 2016-04-01 (2 Comments)
Solution computer finds overlooked values by Charlie (2016-04-01 10:48:18)
Difficulty: 3 of 5Under 4 partitions, same product (in Numbers)
Posted on 2016-03-31 (1 Comments)
Solution computer solution and discussion by Charlie (2016-03-31 10:32:29)
Difficulty: 2 of 5Under Fibs and Mods. (in Numbers)
Posted on 2016-03-30 (1 Comments)
Hints/Tips no proof here, just some verification, and a new fact by Charlie (2016-03-30 11:28:53)
Difficulty: 3 of 5Under Quartering a Square (in Shapes)
Posted on 2016-03-29 (4 Comments)
re(2): computer solution by Charlie (2016-03-30 08:18:22)
re: computer solution by Charlie (2016-03-29 16:08:03)
Solution computer solution by Charlie (2016-03-29 15:45:59)
Difficulty: 2 of 5Under Tatami Tiling (in Shapes)
Posted on 2016-03-29 (2 Comments)
Solution solution by Charlie (2016-03-29 10:27:33)
Difficulty: 3 of 5Under Electrical Cube 2 (in Science)
Posted on 2016-03-25 (2 Comments)
Solution solution by Charlie (2016-03-25 10:22:17)
Difficulty: 3 of 5Under Sum from Arithmetic and Geometric (in Sequences)
Posted on 2016-03-24 (5 Comments)
Solution computer solution by Charlie (2016-03-24 15:32:13)
re(2): Possible Solution by Charlie (2016-03-24 15:27:09)
Difficulty: 3 of 5Under Double Reflection (in Geometry)
Posted on 2016-03-24 (2 Comments)
Solution solution by Charlie (2016-03-24 10:23:45)
Difficulty: 3 of 5Under Minimizing n (in Numbers)
Posted on 2016-03-23 (2 Comments)
Solution computer confirmation (solution) by Charlie (2016-03-23 13:34:40)
Difficulty: 2 of 5Under Neighbors or not? (in Probability)
Posted on 2016-03-22 (3 Comments)
Solution solution by Charlie (2016-03-22 13:21:52)
Difficulty: 3 of 5Under Rational Value Validation (in Just Math)
Posted on 2016-03-20 (11 Comments)
Some Thoughts re: solution for 4 elements only by Charlie (2016-03-23 14:52:58)
Some Thoughts solution for 4 elements only by Charlie (2016-03-22 08:12:50)
re(3): cardinality of solution set by Charlie (2016-03-21 17:02:49)
re: cardinality of solution set by Charlie (2016-03-21 10:14:55)
cardinality of solution set by Charlie (2016-03-21 08:00:01)
re(2): Two special results by Charlie (2016-03-20 22:49:12)
Hints/Tips Two special results by Charlie (2016-03-20 10:26:59)
Some Thoughts a sampling of 500 at random by Charlie (2016-03-20 10:14:35)
Difficulty: 3 of 5Under 2 coins (in Probability)
Posted on 2016-03-18 (8 Comments)
Solution Bayes by Charlie (2016-03-18 11:10:23)
Difficulty: 3 of 5Under Never 0 mod 3 (in Probability)
Posted on 2016-03-17 (7 Comments)
re(4): Solution by Charlie (2016-03-17 23:21:55)
re(3): Solution by Charlie (2016-03-17 22:33:33)
re(2): Solution by Charlie (2016-03-17 21:34:14)
re: Solution by Charlie (2016-03-17 14:47:17)
Some Thoughts Values for the first 5 k by Charlie (2016-03-17 14:39:24)
Difficulty: 2 of 5Under Find number and base (in Numbers)
Posted on 2016-03-17 (6 Comments)
Solution solution by Charlie (2016-03-17 10:41:11)
Difficulty: 4 of 5Under Set Me Up Again (in Numbers)
Posted on 2016-03-16 (1 Comments)
Solution computer solution by Charlie (2016-03-16 16:10:34)
Difficulty: 3 of 5Under Minimal cardinality (in Numbers)
Posted on 2016-03-16 (3 Comments)
Solution proposed solution by Charlie (2016-03-16 09:48:15)
Difficulty: 4 of 5Under To-day is Monday & a PIday (in Numbers)
Posted on 2016-03-14 (13 Comments)
re(2): My best @ jer and CH by Charlie (2016-03-15 09:00:50)
Hints/Tips some lower numerator/denominator pairs by Charlie (2016-03-14 14:17:52)
Hints/Tips computer-generated solving aid by Charlie (2016-03-14 09:05:33)
Difficulty: 3 of 5Under Only one below 5000 (in Numbers)
Posted on 2016-03-11 (4 Comments)
Solution computer solution by Charlie (2016-03-11 15:28:34)
Difficulty: 4 of 5Under Ring of triangles II (in Geometry)
Posted on 2016-03-10 (2 Comments)
Solution re: computer solution -- revised by Charlie (2016-03-10 10:09:56)
Solution computer solution by Charlie (2016-03-10 09:43:35)
Difficulty: 3 of 5Under More bouncing (in Geometry)
Posted on 2016-03-09 (3 Comments)
re(2): proposed solution by Charlie (2016-03-10 07:32:51)
Solution proposed solution by Charlie (2016-03-09 14:28:48)
Difficulty: 3 of 5Under 8th Term from Term Product (in Sequences)
Posted on 2016-03-07 (5 Comments)
Solution computer solution by Charlie (2016-03-07 13:43:58)
Difficulty: 1 of 5Under d1 or more ? (in Numbers)
Posted on 2016-03-07 (4 Comments)
Some Thoughts thoughts by Charlie (2016-03-07 09:49:56)
Difficulty: 3 of 5Under Matryoshka Nesting Primes (in Numbers)
Posted on 2016-03-03 (11 Comments)
re(3): computer solution NEEDS FILTERING by Charlie (2016-03-03 20:09:20)
re(2): computer solution NEEDS FILTERING by Charlie (2016-03-03 20:05:25)
re(7): computer solution -- the program by Charlie (2016-03-03 15:29:17)
re(6): computer solution (continued) by Charlie (2016-03-03 15:28:22)
re(5): computer solution (continued) by Charlie (2016-03-03 15:27:27)
re(4): computer solution (continued) by Charlie (2016-03-03 15:26:32)
re(3): computer solution (continued) by Charlie (2016-03-03 15:24:53)
re(2): computer solution (continued) by Charlie (2016-03-03 15:23:04)
re: computer solution (continued) by Charlie (2016-03-03 15:22:06)
Solution computer solution by Charlie (2016-03-03 15:20:13)
Difficulty: 3 of 5Under Cheese Cut Calculation (in Just Math)
Posted on 2016-03-03 (1 Comments)
Solution computer solution by Charlie (2016-03-03 11:31:38)
Difficulty: 3 of 5Under Ring of triangles I (in Geometry)
Posted on 2016-03-02 (2 Comments)
Solution computer solution -- spoiler by Charlie (2016-03-02 15:41:57)
Difficulty: 3 of 5Under Arithmetic Roots (in Just Math)
Posted on 2016-03-02 (2 Comments)
Solution solution with computer assist by Charlie (2016-03-02 10:32:09)
Difficulty: 3 of 5Under Light Beam Reflection (in Shapes)
Posted on 2016-03-01 (1 Comments)
Solution solution by Charlie (2016-03-01 15:22:28)
Difficulty: 2 of 5Under 13 and 2 (in Numbers)
Posted on 2016-03-01 (6 Comments)
Some Thoughts re: answer by Charlie (2016-03-01 09:20:29)
computer still finds no solution by Charlie (2016-03-01 09:17:38)
Difficulty: 3 of 5Under On Track (in Just Math)
Posted on 2016-02-29 (7 Comments)
re: Misread the problem by Charlie (2016-03-01 07:27:05)
re: Circular logic (spoiler) by Charlie (2016-02-29 21:49:52)
Difficulty: 3 of 5Under Miles to Kilometers (in General)
Posted on 2016-02-26 (3 Comments)
re: quick Excel solution by Charlie (2016-02-26 10:07:44)
Solution computer solution by Charlie (2016-02-26 10:03:15)
Difficulty: 3 of 5Under Initial Term Illation (in Sequences)
Posted on 2016-02-25 (2 Comments)
Solution computer solution by Charlie (2016-02-25 16:03:19)
Difficulty: 3 of 5Under A Non-Reintersecting Tangent (in Calculus)
Posted on 2016-02-24 (1 Comments)
Solution solution by Charlie (2016-02-24 15:09:22)
Difficulty: 3 of 5Under My four numbers (in Just Math)
Posted on 2016-02-24 (12 Comments)
re(2): solution -- spoiler by Charlie (2016-02-25 07:56:24)
Solution solution -- spoiler by Charlie (2016-02-24 12:18:06)
Difficulty: 3 of 5Under In a bar (in Probability)
Posted on 2016-02-23 (6 Comments)
re: Last Call by Charlie (2016-02-24 10:22:27)
Solution solution, with caveat by Charlie (2016-02-23 14:03:10)
Difficulty: 3 of 5Under Cheese Cut Conclusion (in Shapes)
Posted on 2016-02-23 (2 Comments)
Solution it would seem... (spoiler) by Charlie (2016-02-23 11:20:35)
Difficulty: 3 of 5Under Geometric and Three Power Travail (in Sequences)
Posted on 2016-02-22 (2 Comments)
Solution computer assisted solution by Charlie (2016-02-22 12:17:23)
Difficulty: 2 of 5Under Counting Ten Segment Paths (in General)
Posted on 2016-02-19 (6 Comments)
Solution The basic set (rotations and reflections eliminated) by Charlie (2016-02-19 20:48:00)
Solution Missed a few before--now added; As well as I can classify them by Charlie (2016-02-19 14:59:11)
Solution re(2): As many as I found by Charlie (2016-02-19 14:37:35)
Solution re: As many as I found by Charlie (2016-02-19 14:09:29)
Solution computer solution by Charlie (2016-02-19 13:29:41)
Difficulty: 2 of 5Under 25 * 1 (in Just Math)
Posted on 2016-02-18 (3 Comments)
Solution re(2): solution - what about these? -- back to the computer by Charlie (2016-02-18 13:50:04)
Solution solution by Charlie (2016-02-18 10:55:02)
Difficulty: 4 of 5Under Equal products and sums (in Just Math)
Posted on 2016-02-17 (4 Comments)
re: computer solution -- a specific subset and the program by Charlie (2016-02-17 20:19:11)
Solution computer solution by Charlie (2016-02-17 20:16:44)
Difficulty: 3 of 5Under 1-2-3 Remainder Resolution (in Logic)
Posted on 2016-02-16 (12 Comments)
Solution computer solution by Charlie (2016-02-16 11:59:08)
Difficulty: 3 of 5Under Big difference (in Numbers)
Posted on 2016-02-14 (4 Comments)
re(3): computer solutions by Charlie (2016-02-14 20:05:51)
Solution computer solutions by Charlie (2016-02-14 15:03:30)
Difficulty: 4 of 5Under Optimal Order (in Sequences)
Posted on 2016-02-10 (5 Comments)
re: This should work by Charlie (2016-02-14 11:33:18)
Difficulty: 2 of 5Under How high the moon tonight (in Numbers)
Posted on 2016-02-10 (1 Comments)
Solution computer solution by Charlie (2016-02-10 12:36:36)
Difficulty: 3 of 5Under Consecutive Numbers and Subset Choice (in Just Math)
Posted on 2016-02-09 (6 Comments)
found the error in method 2 by Charlie (2016-02-09 16:29:47)
Solution on the other hand by Charlie (2016-02-09 16:15:26)
Some Thoughts 2 computer solutions; the second is probably right by Charlie (2016-02-09 16:06:19)
Difficulty: 4 of 5Under Pumpkins 7 (in Just Math)
Posted on 2016-02-05 (2 Comments)
Solution computer solution by Charlie (2016-02-05 15:41:05)
Difficulty: 3 of 5Under Evaluate further probabilities (in Probability)
Posted on 2016-02-03 (2 Comments)
Solution computer-aided solution by Charlie (2016-02-03 11:18:01)
Difficulty: 3 of 5Under Dascal triangle (in Numbers)
Posted on 2016-02-02 (8 Comments)
re(6): computer solution by Charlie (2016-02-04 11:25:27)
re(5): computer solution by Charlie (2016-02-04 10:46:56)
re(3): computer solution by Charlie (2016-02-03 22:16:06)
re(2): computer solution by Charlie (2016-02-03 22:02:24)
Solution computer solution by Charlie (2016-02-02 15:37:44)
Difficulty: 3 of 5Under Find From First and Last (in Just Math)
Posted on 2016-02-02 (1 Comments)
Solution computer solution by Charlie (2016-02-02 11:27:00)
Difficulty: 3 of 5Under Mille and Remainder Resolution (in Sequences)
Posted on 2016-02-01 (3 Comments)
Solution spoiler solution; can it clue toward the intended method? by Charlie (2016-02-02 07:56:22)
Difficulty: 3 of 5Under N Nine Nuance (in Just Math)
Posted on 2016-01-29 (6 Comments)
re: possible solution by Charlie (2016-01-29 11:11:04)
Solution computer solution by Charlie (2016-01-29 10:47:03)
Difficulty: 3 of 5Under Erase the right 90 (in Numbers)
Posted on 2016-01-28 (5 Comments)
re: Sequence? by Charlie (2016-01-29 11:33:30)
Solution proof on the internet (spoiler) by Charlie (2016-01-28 15:16:54)
Difficulty: 3 of 5Under Last term zero (in Sequences)
Posted on 2016-01-28 (3 Comments)
re: Spoiler by Charlie (2016-01-28 10:22:55)
Difficulty: 4 of 5Under 5 cubes (in Numbers)
Posted on 2016-01-26 (1 Comments)
Solution computer solution by Charlie (2016-01-26 15:29:18)
Difficulty: 2 of 5Under Evaluate probabilities (in Probability)
Posted on 2016-01-26 (3 Comments)
Solution simple understanding, and randomization procedures by Charlie (2016-01-26 11:37:16)
Difficulty: 3 of 5Under Floor Function Query (in Just Math)
Posted on 2016-01-25 (1 Comments)
Solution computer solution by Charlie (2016-01-25 11:16:57)
Difficulty: 4 of 5Under Pumpkins 6 (in Numbers)
Posted on 2016-01-22 (11 Comments)
re(3): Analytical solution (Bonus puzzle question) by Charlie (2016-01-27 12:13:38)
Solution computer solution by Charlie (2016-01-22 15:26:29)
Difficulty: 3 of 5Under Hypotenuse from Cone (in Shapes)
Posted on 2016-01-22 (2 Comments)
Solution same solution numerically by Charlie (2016-01-22 10:42:20)
Difficulty: 3 of 5Under Binary Palindrome and Near Magic Square (in Just Math)
Posted on 2016-01-21 (1 Comments)
Solution computer solution by Charlie (2016-01-21 15:48:43)
Difficulty: 3 of 5Under Find the next two numbers (in Sequences)
Posted on 2016-01-21 (4 Comments)
re: As Jer by Charlie (2016-01-22 10:46:37)
Difficulty: 4 of 5Under Detect my chosen coin (in Games)
Posted on 2016-01-19 (19 Comments)
re(3): Suggested wording for solution. by Charlie (2016-02-04 11:09:09)
Suggested wording for solution. by Charlie (2016-02-03 22:53:36)
re: The egg of Colubus by Charlie (2016-01-26 13:24:59)
Difficulty: 3 of 5Under 9 coins prob (in Weights and Scales)
Posted on 2016-01-18 (6 Comments)
re: Two preplanned weighings by Charlie (2016-01-19 07:56:20)
Solution Outline of a sample solution by Charlie (2016-01-18 15:50:43)
Difficulty: 3 of 5Under 6 coins (in Weights and Scales)
Posted on 2016-01-13 (10 Comments)
Solution re(2): short solution - spoiler by Charlie (2016-01-14 19:59:00)
re: short solution - spoiler by Charlie (2016-01-13 19:29:50)
Solution computer solution by Charlie (2016-01-13 14:32:07)
Some Thoughts computer attempt by Charlie (2016-01-13 13:42:02)
re: Solution by Charlie (2016-01-13 12:40:10)
Difficulty: 2 of 5Under Expose ambiguity (in Logic)
Posted on 2016-01-13 (5 Comments)
Solution one possible set by Charlie (2016-01-13 09:11:38)
Difficulty: 3 of 5Under Sine in a Circle (in Shapes)
Posted on 2016-01-11 (1 Comments)
Solution solution by Charlie (2016-01-11 15:13:50)
Difficulty: 4 of 5Under Primevens and primeodds (in Numbers)
Posted on 2016-01-10 (8 Comments)
Solution re(4): some stats extended by Charlie (2016-01-11 22:06:41)
re(3): some stats extended by Charlie (2016-01-11 07:39:15)
re: some stats extended by Charlie (2016-01-10 17:56:21)
Some Thoughts some stats by Charlie (2016-01-10 14:12:52)
Difficulty: 4 of 5Under Lost in the woods (in Just Math)
Posted on 2016-01-08 (12 Comments)
Solution proposed solution by Charlie (2016-01-08 15:43:08)
Difficulty: 3 of 5Under Pumpkins 5 (in Weights and Scales)
Posted on 2016-01-06 (2 Comments)
Solution computer solution by Charlie (2016-01-06 11:25:21)
Difficulty: 3 of 5Under Test #9 (in Word Problems)
Posted on 2016-01-05 (4 Comments)
Some Thoughts from my word list by Charlie (2016-01-05 11:30:24)
Difficulty: 3 of 5Under Twenty deposits (in Just Math)
Posted on 2016-01-04 (4 Comments)
Solution solution by Charlie (2016-01-04 15:33:04)
Difficulty: 2 of 5Under One out of Five (in Weights and Scales)
Posted on 2016-01-04 (2 Comments)
Solution My solution is way too convoluted by Charlie (2016-01-04 10:54:12)
Difficulty: 3 of 5Under Arithmetic Triplet Ascertainment (in Just Math)
Posted on 2016-01-03 (1 Comments)
Solution Heuristic solution by Charlie (2016-01-03 10:57:44)
Difficulty: 4 of 5Under Peaceful superqueens (in General)
Posted on 2015-12-31 (2 Comments)
Solution computer solutions by Charlie (2015-12-31 15:16:31)
Difficulty: 3 of 5Under Infinite Illation Decision (in Just Math)
Posted on 2015-12-31 (3 Comments)
Some Thoughts It seems... by Charlie (2015-12-31 10:18:36)
Difficulty: 3 of 5Under Monotonous integers (in Numbers)
Posted on 2015-12-30 (9 Comments)
Solution solution, starting out with analytic by Charlie (2015-12-30 13:51:37)
Difficulty: 3 of 5Under A five letter word (in Word Problems)
Posted on 2015-12-28 (6 Comments)
Solution computer solution by Charlie (2015-12-28 21:04:38)
Difficulty: 3 of 5Under From pie to numbers (in Numbers)
Posted on 2015-12-27 (16 Comments)
re: solutions for most numbers by Charlie (2015-12-28 08:07:34)
re: one more by Charlie (2015-12-27 15:57:44)
Solution computer solution by Charlie (2015-12-27 13:40:30)
Difficulty: 3 of 5Under Binary Palindrome Square Magic (in Just Math)
Posted on 2015-12-24 (11 Comments)
re: Magic Squares by Charlie (2015-12-26 07:50:24)
re: No Subject by Charlie (2015-12-25 08:11:02)
Difficulty: 3 of 5Under Ten cities (in Cryptography)
Posted on 2015-12-24 (1 Comments)
Solution computer solution by Charlie (2015-12-24 10:48:08)
Difficulty: 3 of 5Under Power and Digit Poser (in Just Math)
Posted on 2015-12-23 (2 Comments)
Solution solution by Charlie (2015-12-23 11:01:08)
Difficulty: 3 of 5Under Pentagon and Reflection Poser (in Shapes)
Posted on 2015-12-22 (1 Comments)
Solution Graphing calculator solution by Charlie (2015-12-22 15:10:33)
Difficulty: 2 of 5Under 5-2=1 (in Word Problems)
Posted on 2015-12-21 (5 Comments)
Solution computer solution by Charlie (2015-12-21 10:29:33)
Difficulty: 2 of 5Under 80 (in Numbers)
Posted on 2015-12-19 (3 Comments)
Some Thoughts computer solutions for all but 2359 by Charlie (2015-12-19 13:15:36)
Difficulty: 3 of 5Under Some sequences! (in Sequences)
Posted on 2015-12-18 (1 Comments)
Solution computer solution by Charlie (2015-12-18 11:00:18)
Difficulty: 3 of 5Under Distinct Triangle Determination (in Shapes)
Posted on 2015-12-16 (3 Comments)
re(2): computer solution (Spoiler) by Charlie (2015-12-17 11:38:36)
Solution computer solution by Charlie (2015-12-16 15:13:21)
Difficulty: 3 of 5Under Protecting the fleet Parts C. & D. (in Geometry)
Posted on 2015-12-15 (2 Comments)
Solution solution by Charlie (2015-12-15 18:58:34)
Difficulty: 3 of 5Under A peculiar pandigital (in Numbers)
Posted on 2015-12-14 (2 Comments)
Solution All of them by Charlie (2015-12-14 19:06:38)
Difficulty: 2 of 5Under Protecting the fleet Parts A. & B. (in Geometry)
Posted on 2015-12-14 (4 Comments)
re(2): solutions by Charlie (2015-12-15 10:57:18)
Solution solutions by Charlie (2015-12-14 15:04:04)
Difficulty: 3 of 5Under Four Digit and Two Digit Treat (in Just Math)
Posted on 2015-12-13 (1 Comments)
Solution computer solution by Charlie (2015-12-13 18:21:48)
Difficulty: 2 of 5Under Using a standard deck (in Numbers)
Posted on 2015-12-11 (2 Comments)
re: Solution by Charlie (2015-12-12 08:09:11)
Difficulty: 3 of 5Under A peculiar triangular number (in Numbers)
Posted on 2015-12-10 (2 Comments)
Solution computer solution (spoiler) by Charlie (2015-12-10 18:00:00)
Difficulty: 2 of 5Under Triple Letter Occurrence, Twice! (in Word Problems)
Posted on 2015-12-10 (3 Comments)
Solution computer solution 6-, 7- and 8-letter words by Charlie (2015-12-10 09:13:26)
Difficulty: 3 of 5Under Two Light Coins (in Weights and Scales)
Posted on 2015-12-09 (1 Comments)
Solution solution by Charlie (2015-12-09 19:44:31)
Difficulty: 3 of 5Under Hold your horses (in General)
Posted on 2015-12-09 (3 Comments)
Solution solution by Charlie (2015-12-09 13:07:08)
Difficulty: 3 of 5Under A special short-list (in Numbers)
Posted on 2015-12-08 (3 Comments)
Solution solution with computer-generated list by Charlie (2015-12-08 10:45:22)
Difficulty: 3 of 5Under Fibonaccish ratio (in Sequences)
Posted on 2015-12-07 (3 Comments)
re(2): solution by Charlie (2015-12-07 19:54:13)
Solution solution by Charlie (2015-12-07 18:01:58)
Difficulty: 3 of 5Under Cos Case Concern (in Shapes)
Posted on 2015-12-06 (5 Comments)
re: Two solutions by Charlie (2015-12-06 15:08:11)
Difficulty: 2 of 5Under List of pairs (in Just Math)
Posted on 2015-12-04 (3 Comments)
Solution computer solution -- first eight pairs by Charlie (2015-12-04 11:27:37)
Difficulty: 3 of 5Under A Math Problem (in Just Math)
Posted on 2015-12-03 (6 Comments)
Solution computer solution of a way that works by Charlie (2015-12-03 15:28:25)
Difficulty: 3 of 5Under Get the right product (in Just Math)
Posted on 2015-12-01 (5 Comments)
Some Thoughts Possible for 9 by Charlie (2015-12-02 11:11:35)
computer verification it doesn't work for n=9 by Charlie (2015-12-02 10:52:59)
Difficulty: 2 of 5Under Daylight Saving (in Cryptography)
Posted on 2015-12-01 (4 Comments)
Solution re: Wrong Answer (spoiler) by Charlie (2015-12-01 11:20:44)
Difficulty: 3 of 5Under Increasing sequences (in Just Math)
Posted on 2015-11-30 (3 Comments)
Solution computer solution by Charlie (2015-11-30 14:48:11)
Difficulty: 3 of 5Under Table's peculiarity (in Just Math)
Posted on 2015-11-29 (6 Comments)
re(3): Example needed by Charlie (2015-11-30 19:09:30)
re: Example needed by Charlie (2015-11-30 08:24:58)
Difficulty: 3 of 5Under 1-2-3 Square Settlement (in Just Math)
Posted on 2015-11-27 (3 Comments)
re(2): computer solution -- smallest nine values by Charlie (2015-11-28 08:58:06)
Solution computer solution -- smallest nine values by Charlie (2015-11-27 15:30:18)
Difficulty: 3 of 5Under Root factorial (in Numbers)
Posted on 2015-11-25 (1 Comments)
Some Thoughts thoughts by Charlie (2015-11-25 15:01:26)
Difficulty: 3 of 5Under Square in a notched square (in Geometry)
Posted on 2015-11-25 (4 Comments)
Solution A method of calculation--needs simplification. by Charlie (2015-11-25 10:22:26)
Difficulty: 3 of 5Under Biggest and smallest (in Just Math)
Posted on 2015-11-24 (2 Comments)
Solution computer solution by Charlie (2015-11-24 10:34:15)
Difficulty: 3 of 5Under Summing Consecutive Terms and Pair Determination (in Sequences)
Posted on 2015-11-21 (3 Comments)
Solution computer solution by Charlie (2015-11-21 13:11:45)
Difficulty: 3 of 5Under Generalizing II (in Sequences)
Posted on 2015-11-20 (2 Comments)
Solution a way to calculate by Charlie (2015-11-20 14:45:19)
Difficulty: 3 of 5Under Counting correctly (in Numbers)
Posted on 2015-11-19 (3 Comments)
re(2): analytic solution, subject to error by Charlie (2015-11-19 13:31:43)
Solution analytic solution, subject to error by Charlie (2015-11-19 11:13:05)
Difficulty: 4 of 5Under If you go (in Numbers)
Posted on 2015-11-18 (2 Comments)
Solution computer solution by Charlie (2015-11-18 16:12:10)
Difficulty: 3 of 5Under Upgrading procedure (in Just Math)
Posted on 2015-11-17 (1 Comments)
Solution computer solution by Charlie (2015-11-17 18:57:42)
Difficulty: 2 of 5Under A non-trivial progression (in Numbers)
Posted on 2015-11-17 (7 Comments)
re(2): answers revisited by Charlie (2015-11-18 11:23:18)
Solution d2 answers by Charlie (2015-11-17 10:37:59)
Difficulty: 2 of 5Under Cryptajoke XII (in Cryptography)
Posted on 2015-11-16 (2 Comments)
Solution solution (spoiler) by Charlie (2015-11-16 12:31:12)
Difficulty: 4 of 5Under 9-letter word II (in Sequences)
Posted on 2015-11-13 (1 Comments)
Solution computer aided solution by Charlie (2015-11-13 15:49:41)
Difficulty: 1 of 5Under 6 or less liars (in Liars and Knights)
Posted on 2015-11-13 (17 Comments)
re(3): Summing up - spoiler by Charlie (2015-11-17 10:57:38)
re(4): solution by Charlie (2015-11-15 18:39:50)
Solution solution by Charlie (2015-11-13 10:50:54)
Difficulty: 3 of 5Under 3c+2v (in Word Problems)
Posted on 2015-11-12 (3 Comments)
Solution computer solution by Charlie (2015-11-12 13:23:55)
Difficulty: 2 of 5Under Two sisters (in Famous Riddles)
Posted on 2015-11-12 (2 Comments)
Solution re: Possible solution by Charlie (2015-11-12 10:47:27)
Difficulty: 3 of 5Under Sphere Intersections (in Geometry)
Posted on 2015-11-11 (4 Comments)
Some Thoughts My thinking on it. by Charlie (2015-11-11 15:28:50)
Difficulty: 2 of 5Under Count the palindromes (in Just Math)
Posted on 2015-11-11 (7 Comments)
Solution computer solution by Charlie (2015-11-11 10:27:25)
Difficulty: 3 of 5Under Wise saw (in General)
Posted on 2015-11-10 (4 Comments)
re: 2/3 solution (spoiler) by Charlie (2015-11-10 14:04:57)
Difficulty: 2 of 5Under Tiling and counting (in Numbers)
Posted on 2015-11-10 (3 Comments)
Solution He's back by Charlie (2015-11-10 10:49:22)
Difficulty: 3 of 5Under ….to skin a cat (in Logic)
Posted on 2015-11-09 (5 Comments)
re(3): The one that seems obvious by Charlie (2015-11-09 21:54:27)
Some Thoughts The one that seems obvious by Charlie (2015-11-09 12:38:10)
Difficulty: 3 of 5Under Cryptajoke XI (in Cryptography)
Posted on 2015-11-09 (1 Comments)
Solution spoilers by Charlie (2015-11-09 10:32:52)
Difficulty: 4 of 5Under Cons and vows (in Word Problems)
Posted on 2015-11-06 (6 Comments)
#3 by Charlie (2015-11-09 07:55:24)
Difficulty: 2 of 5Under Four factors (in Just Math)
Posted on 2015-11-06 (3 Comments)
Solution by induction, not rigorous by Charlie (2015-11-06 09:56:37)
Difficulty: 4 of 5Under Matching pairs II (in Word Problems)
Posted on 2015-11-05 (3 Comments)
re(2): most paired up,- except the redundant ones by Charlie (2015-11-06 07:46:30)
Some Thoughts most paired up by Charlie (2015-11-05 15:42:36)
Difficulty: 3 of 5Under An interesting matrix (in Sequences)
Posted on 2015-11-05 (3 Comments)
re(2): solution -- calculations by computer by Charlie (2015-11-05 19:21:30)
Solution solution -- calculations by computer by Charlie (2015-11-05 10:06:29)
Difficulty: 3 of 5Under 10 4 7 10 (in Just Math)
Posted on 2015-11-03 (2 Comments)
Solution computer solutions by Charlie (2015-11-03 14:31:07)
Difficulty: 2 of 5Under Two and only two (in Just Math)
Posted on 2015-11-03 (4 Comments)
re: a quick look by Charlie (2015-11-03 14:58:18)
Some Thoughts a quick look by Charlie (2015-11-03 08:50:28)
Difficulty: 3 of 5Under Seven numbers for seven words (in Cryptography)
Posted on 2015-11-02 (1 Comments)
Solution computer assisted solution by Charlie (2015-11-02 14:48:09)
Difficulty: 3 of 5Under Diophantine Linear and Quadratic (in Just Math)
Posted on 2015-11-01 (4 Comments)
Solution computer solution by Charlie (2015-11-01 13:26:19)
re: Analytical solution (spoiler) by Charlie (2015-11-01 13:04:04)
Difficulty: 4 of 5Under Incredible, but solvable (in Just Math)
Posted on 2015-10-30 (13 Comments)
re: @ Charlie- an explanation and a question by Charlie (2015-10-31 21:23:38)
re(5): comp. aided solution -- HINT by Charlie (2015-10-31 08:07:16)
re(4): comp. aided solution -- HINT by Charlie (2015-10-31 07:59:05)
Solution re(2): computer aided solution -- continued by Charlie (2015-10-30 15:28:09)
Solution re: computer aided solution -- continued by Charlie (2015-10-30 15:26:16)
Solution computer aided solution by Charlie (2015-10-30 15:23:50)
Difficulty: 2 of 5Under A plural of a plural (in Word Problems)
Posted on 2015-10-30 (5 Comments)
Solution What moderns do with Latin by Charlie (2015-10-30 10:25:35)
Difficulty: 3 of 5Under Term Sum Settlement (in Sequences)
Posted on 2015-10-29 (3 Comments)
Solution Well, it could have been solved manually, but... by Charlie (2015-10-29 14:31:45)
Difficulty: 3 of 5Under No peace (in Word Problems)
Posted on 2015-10-29 (4 Comments)
re: Some clarifications by Charlie (2015-10-30 10:29:09)
Some Thoughts Most, but not all by Charlie (2015-10-29 09:49:17)
Difficulty: 2 of 5Under Some questions of abundance (in Just Math)
Posted on 2015-10-28 (3 Comments)
re(2): proposed solution / counterexample by Charlie (2015-10-28 13:06:43)
Solution proposed solution by Charlie (2015-10-28 10:38:43)
Difficulty: 3 of 5Under Real Number Resolution 2 (in Just Math)
Posted on 2015-10-27 (1 Comments)
Solution proposed solution by Charlie (2015-10-27 16:00:01)
Difficulty: 3 of 5Under Numbered Letters IV (in Word Problems)
Posted on 2015-10-26 (3 Comments)
Solution computer solution by Charlie (2015-10-26 15:37:59)
Difficulty: 2 of 5Under Magic matrix (in Just Math)
Posted on 2015-10-26 (1 Comments)
Solution computer solution by Charlie (2015-10-26 10:55:37)
Difficulty: 3 of 5Under Sum Equality and Perfect Square (in Just Math)
Posted on 2015-10-25 (2 Comments)
Solution computer solution by Charlie (2015-10-25 14:44:58)
Difficulty: 2 of 5Under Must differ by 3 (in Just Math)
Posted on 2015-10-23 (3 Comments)
Solution computer proof by Charlie (2015-10-23 13:03:39)
Difficulty: 2 of 5Under Extend the list (in Word Problems)
Posted on 2015-10-22 (2 Comments)
Solution some more by Charlie (2015-10-22 21:46:42)
Difficulty: 3 of 5Under More ones (in Just Math)
Posted on 2015-10-21 (1 Comments)
Solution computer solution by Charlie (2015-10-21 15:27:42)
Difficulty: 3 of 5Under Distinct Values Determination (in Just Math)
Posted on 2015-10-20 (4 Comments)
the missing values by Charlie (2015-10-20 11:44:21)
Solution computer solution differs by Charlie (2015-10-20 11:25:46)
Difficulty: 3 of 5Under Factorials & factorions (in Numbers)
Posted on 2015-10-19 (2 Comments)
Solution computer solution by Charlie (2015-10-19 14:42:49)
Difficulty: 2 of 5Under Will you find it? (in Cryptography)
Posted on 2015-10-19 (2 Comments)
It, or them? by Charlie (2015-10-19 14:39:45)
Difficulty: 4 of 5Under Generalizing (in Geometry)
Posted on 2015-10-16 (2 Comments)
Some Thoughts just offhand... by Charlie (2015-10-16 22:28:38)
Difficulty: 3 of 5Under Palindromes and Divisibility (in Just Math)
Posted on 2015-10-16 (3 Comments)
Solution re: analytic solution by Charlie (2015-10-16 14:16:53)
Solution computer solution by Charlie (2015-10-16 10:50:58)
Difficulty: 3 of 5Under Oblong Difference Observation (in Just Math)
Posted on 2015-10-15 (5 Comments)
Solution two more solutions (computer solutions) by Charlie (2015-10-15 13:58:20)
Difficulty: 2 of 5Under Same digits - 3 cubes (in Numbers)
Posted on 2015-10-14 (1 Comments)
Solution computer solution by Charlie (2015-10-14 10:45:14)
Difficulty: 3 of 5Under Triangular and Square Settlement (in Just Math)
Posted on 2015-10-13 (7 Comments)
extended list by Charlie (2015-10-14 08:09:55)
Solution computer solution by Charlie (2015-10-13 15:34:15)
Difficulty: 3 of 5Under Integer Count Illation (in Just Math)
Posted on 2015-10-12 (1 Comments)
Solution solution by Charlie (2015-10-12 15:29:02)
Difficulty: 2 of 5Under Count them correctly (in Numbers)
Posted on 2015-10-12 (2 Comments)
Solution same answer by Charlie (2015-10-12 10:42:20)
Difficulty: 4 of 5Under Permutations count redux (in Numbers)
Posted on 2015-10-09 (1 Comments)
Some Thoughts first simpler consideration by Charlie (2015-10-12 13:46:19)
Difficulty: 3 of 5Under Integer Function Finding (in Just Math)
Posted on 2015-10-09 (1 Comments)
Some Thoughts computer guided guess by Charlie (2015-10-09 11:22:43)
Difficulty: 3 of 5Under sum of digits and 100th term (in Sequences)
Posted on 2015-10-08 (3 Comments)
Solution I did miss something in the previous post. by Charlie (2015-10-09 08:27:51)
Solution I've probably miscounted but here goes. by Charlie (2015-10-08 21:24:23)
Difficulty: 2 of 5Under 8 digit rhyme (in Cryptography)
Posted on 2015-10-08 (1 Comments)
Solution solution (spoiler) by Charlie (2015-10-08 10:44:23)
Difficulty: 3 of 5Under Non zero product (in Just Math)
Posted on 2015-10-07 (1 Comments)
Solution computer assisted calculation by Charlie (2015-10-07 20:02:02)
Difficulty: 3 of 5Under Digit sum and digit product equality (in Just Math)
Posted on 2015-10-06 (2 Comments)
Solution computer aided solution by Charlie (2015-10-06 20:28:06)
Difficulty: 3 of 5Under Random Choice (in Probability)
Posted on 2015-10-02 (1 Comments)
Solution solution by Charlie (2015-10-02 10:25:48)
Difficulty: 3 of 5Under Permutations count (in Numbers)
Posted on 2015-10-01 (10 Comments)
I guess simplicity is in the mind of the user by Charlie (2015-10-02 09:57:08)
Solution solution by Charlie (2015-10-01 16:02:09)
Difficulty: 2 of 5Under Phrase find ponder (in Word Problems)
Posted on 2015-10-01 (6 Comments)
re(2): first undoubtedly incorrect thoughts by Charlie (2015-10-01 16:11:55)
Difficulty: 3 of 5Under Extreme Sum Settlement (in Just Math)
Posted on 2015-09-28 (4 Comments)
re: Solution (barring errors) by Charlie (2015-09-28 16:02:04)
Solution the computer doesn't tire of writing the numbers by Charlie (2015-09-28 15:56:47)
Difficulty: 1 of 5Under Cryptajoke IX (in Cryptography)
Posted on 2015-09-28 (2 Comments)
Solution way by Charlie (2015-09-28 10:31:35)
Difficulty: 5 of 5Under 9-letter word (in Numbers)
Posted on 2015-09-25 (6 Comments)
re(2): computer solutions by Charlie (2015-09-26 07:35:38)
Solution computer solutions by Charlie (2015-09-25 16:15:56)
Difficulty: 4 of 5Under Quit as a winner (in Games)
Posted on 2015-09-24 (9 Comments)
re(2): some research (spoiler) by Charlie (2015-09-24 18:35:16)
Solution some research (spoiler) by Charlie (2015-09-24 16:26:17)
further fine tuning by Charlie (2015-09-24 15:47:31)
re: computer exploration by Charlie (2015-09-24 15:38:36)
Some Thoughts computer exploration by Charlie (2015-09-24 15:05:47)
Difficulty: 3 of 5Under Cheryl's b-day (in Logic)
Posted on 2015-09-24 (4 Comments)
Solution solution by Charlie (2015-09-24 10:16:36)
Difficulty: 2 of 5Under Three brothers (in Just Math)
Posted on 2015-09-23 (2 Comments)
Solution solution by Charlie (2015-09-23 11:25:20)
Difficulty: 3 of 5Under Less Than 2015 (in Just Math)
Posted on 2015-09-22 (3 Comments)
re(2): computer solution -- trying to explain it by Charlie (2015-09-23 15:56:46)
Solution computer solution by Charlie (2015-09-22 17:23:10)
Difficulty: 2 of 5Under Hexakosioihexekontahexaphobia (in General)
Posted on 2015-09-22 (3 Comments)
Solution It seems... by Charlie (2015-09-22 10:02:04)
Difficulty: 3 of 5Under Rook Placement (in Games)
Posted on 2015-09-21 (5 Comments)
re: Detailed solution (SPOILER) by Charlie (2015-09-26 07:51:35)
Difficulty: 3 of 5Under Three Power and Product Divisibility (in Just Math)
Posted on 2015-09-19 (2 Comments)
Some Thoughts re: computer exploration by Charlie (2015-09-20 18:58:36)
Some Thoughts computer exploration by Charlie (2015-09-20 07:56:20)
Difficulty: 3 of 5Under Expression Product Exercise (in Just Math)
Posted on 2015-09-18 (5 Comments)
even UBASIC can get only to 8 in direct calculation by Charlie (2015-09-20 08:23:36)
Some Thoughts computer exploration -- far from a proof by Charlie (2015-09-18 12:37:49)
Difficulty: 2 of 5Under 2 easy cryptajokes (VIII) (in Cryptography)
Posted on 2015-09-18 (3 Comments)
Some Thoughts caught the thief -- not the fish by Charlie (2015-09-18 09:21:00)
Difficulty: 3 of 5Under Some definite results (in Numbers)
Posted on 2015-09-17 (5 Comments)
re: non-analytic solution by Charlie (2015-09-18 08:27:49)
Difficulty: 3 of 5Under Marissa's and Melissa's birthdays (in Logic)
Posted on 2015-09-17 (1 Comments)
Solution solution with some computer assistance by Charlie (2015-09-17 12:20:00)
Difficulty: 3 of 5Under Check divisibility (in Numbers)
Posted on 2015-09-16 (5 Comments)
re(2): computer exploration (probable spoiler) by Charlie (2015-09-17 07:47:38)
Some Thoughts computer exploration (probable spoiler) by Charlie (2015-09-16 16:13:12)
Difficulty: 3 of 5Under Coordinating arrival (in Just Math)
Posted on 2015-09-15 (2 Comments)
Solution solution by Charlie (2015-09-15 10:57:22)
Difficulty: 3 of 5Under C reverses into F (in Numbers)
Posted on 2015-09-14 (10 Comments)
re(2): computer exploration ....... att ALL by Charlie (2015-09-15 07:51:08)
Question re: A valiant attempt by Charlie (2015-09-14 20:30:42)
Some Thoughts computer exploration by Charlie (2015-09-14 16:19:42)
Difficulty: 3 of 5Under Square Sum and Square Multiple (in Just Math)
Posted on 2015-09-13 (2 Comments)
Solution An extended list -- Using Visual Basic by Charlie (2015-09-13 14:54:43)
Difficulty: 2 of 5Under Prime Ratio Possibility (in Just Math)
Posted on 2015-09-11 (3 Comments)
Solution solution by Charlie (2015-09-11 11:04:22)
Difficulty: 3 of 5Under Fair? (in Games)
Posted on 2015-09-10 (10 Comments)
re: A's strategy by Charlie (2015-09-17 19:29:03)
re: Solution by Charlie (2015-09-14 07:50:09)
re(2): solution by Charlie (2015-09-11 07:40:14)
Solution solution by Charlie (2015-09-10 17:16:31)
Difficulty: 3 of 5Under One-liners (in General)
Posted on 2015-09-09 (4 Comments)
oh, yes; forgot this by Charlie (2015-09-09 20:01:53)
Solution mostly computer solution by Charlie (2015-09-09 15:49:58)
Difficulty: 1 of 5Under Three-syllable word (in Tricks)
Posted on 2015-09-07 (3 Comments)
Solution probably... by Charlie (2015-09-07 12:38:11)
Difficulty: 3 of 5Under Quadratic and Quartic Query (in Just Math)
Posted on 2015-09-06 (3 Comments)
Solution computer solution -- the 33 lowest. by Charlie (2015-09-06 14:13:34)
Difficulty: 3 of 5Under Simultaneous Pythagorean Poser 2 (in Just Math)
Posted on 2015-09-05 (4 Comments)
Solution corrected computer solution by Charlie (2015-09-06 08:46:20)
computer solution by Charlie (2015-09-05 12:48:30)
Difficulty: 2 of 5Under Six countries (in General)
Posted on 2015-09-04 (8 Comments)
re: Alternate solution by Charlie (2015-09-04 18:22:38)
Solution re(3): If only! (more of a spoiler) by Charlie (2015-09-04 15:32:13)
Hints/Tips re: If only! (more of a spoiler) by Charlie (2015-09-04 10:56:00)
Difficulty: 3 of 5Under Not Variety, but... (in Word Problems)
Posted on 2015-09-03 (4 Comments)
re(2): Sorry, wrong answers (spoiler) by Charlie (2015-09-04 07:28:20)
Difficulty: 2 of 5Under Digit Product Puzzle (in Probability)
Posted on 2015-09-03 (3 Comments)
Solution re(2): analytic solution -- corrected by Charlie (2015-09-03 16:32:01)
analytic solution by Charlie (2015-09-03 11:06:44)
Difficulty: 3 of 5Under Arithmetic and Power Puzzle (in Just Math)
Posted on 2015-09-02 (2 Comments)
Some Thoughts computer exploration by Charlie (2015-09-02 15:08:39)
Difficulty: 3 of 5Under Surprising answer (in Probability)
Posted on 2015-09-02 (6 Comments)
Solution solution by Charlie (2015-09-02 11:45:16)
Difficulty: 3 of 5Under Muchos idiomas (in Word Problems)
Posted on 2015-09-01 (2 Comments)
Solution computer solution by Charlie (2015-09-01 16:09:14)
Difficulty: 3 of 5Under Convex Hexagon and Ratio Product (in Shapes)
Posted on 2015-09-01 (3 Comments)
re(2): metasolution by Charlie (2015-09-01 15:56:20)
Solution metasolution by Charlie (2015-09-01 09:59:46)
Difficulty: 3 of 5Under Cryptajoke VII (in Word Problems)
Posted on 2015-08-31 (3 Comments)
Solution solution (spoiler) by Charlie (2015-08-31 15:46:48)
Difficulty: 3 of 5Under Homophone Hunt 2 (in Word Problems)
Posted on 2015-08-31 (5 Comments)
another by Charlie (2015-08-31 09:57:39)
Difficulty: 2 of 5Under A Fibo quadruplet (in Numbers)
Posted on 2015-08-28 (1 Comments)
Solution solution by Charlie (2015-08-28 11:05:46)
Difficulty: 3 of 5Under What am I ? (in Riddles)
Posted on 2015-08-27 (4 Comments)
Solution You are... by Charlie (2015-08-27 09:49:41)
Difficulty: 3 of 5Under Divide et impera part two (in Numbers)
Posted on 2015-08-26 (2 Comments)
Some Thoughts Much data but no proof--computer exploration by Charlie (2015-08-26 12:58:28)
Difficulty: 2 of 5Under Only 2 answers (in Numbers)
Posted on 2015-08-26 (3 Comments)
re(2): computer solution by Charlie (2015-08-26 14:30:25)
Solution computer solution by Charlie (2015-08-26 11:17:03)
Difficulty: 3 of 5Under Hockey pucks (in Logic)
Posted on 2015-08-25 (1 Comments)
Solution solution by Charlie (2015-08-25 14:31:58)
Difficulty: 3 of 5Under Year and Perfect Square Puzzle (in Just Math)
Posted on 2015-08-22 (2 Comments)
Solution computer solution by Charlie (2015-08-22 15:55:34)
Difficulty: 2 of 5Under Numbers in pi (in Numbers)
Posted on 2015-08-21 (4 Comments)
Solution computer solution by Charlie (2015-08-21 10:34:23)
Difficulty: 3 of 5Under Three coins (in Probability)
Posted on 2015-08-20 (10 Comments)
re(6): question by Charlie (2015-08-23 15:08:46)
re(4): question by Charlie (2015-08-22 07:40:37)
re(2): question by Charlie (2015-08-20 15:34:30)
Question question by Charlie (2015-08-20 13:48:19)
Difficulty: 3 of 5Under Visit USA (in General)
Posted on 2015-08-20 (9 Comments)
Some Thoughts If the goal is... by Charlie (2015-08-20 10:42:57)
re: solution by Charlie (2015-08-20 10:39:14)
Difficulty: 3 of 5Under A self-working card trick (in Tricks)
Posted on 2015-08-19 (2 Comments)
Solution solution by Charlie (2015-08-19 15:17:04)
Difficulty: 3 of 5Under This or that? (in Probability)
Posted on 2015-08-19 (4 Comments)
Solution My take on it by Charlie (2015-08-19 10:03:55)
Difficulty: 2 of 5Under Divide et impera (in Numbers)
Posted on 2015-08-18 (2 Comments)
Solution three computer solutions by Charlie (2015-08-18 12:02:45)
Difficulty: 3 of 5Under Perfect Square Digit (in Just Math)
Posted on 2015-08-17 (2 Comments)
Some Thoughts Can't find any under 10 billion by Charlie (2015-08-18 08:01:58)
Difficulty: 2 of 5Under Ez & true (in Riddles)
Posted on 2015-08-17 (1 Comments)
Solution The saying by Charlie (2015-08-18 07:54:46)
Difficulty: 3 of 5Under Non-perfect Cube Root Sum (in Just Math)
Posted on 2015-08-14 (6 Comments)
re: An idea by Charlie (2015-08-14 13:28:01)
Difficulty: 3 of 5Under Rooting for 2015 (in Just Math)
Posted on 2015-08-14 (3 Comments)
Solution confirmed solution by Charlie (2015-08-14 10:22:22)
Difficulty: 3 of 5Under Arithmetic Product Puzzle (in Sequences)
Posted on 2015-08-13 (1 Comments)
Solution computer solution by Charlie (2015-08-13 14:52:35)
Difficulty: 3 of 5Under Eight efficient blacksmiths (in Just Math)
Posted on 2015-08-13 (4 Comments)
Solution re: solution by Charlie (2015-08-13 09:31:05)
Solution solution by Charlie (2015-08-13 09:26:03)
Difficulty: 3 of 5Under Power and Divisibility Puzzle (in Just Math)
Posted on 2015-08-12 (6 Comments)
Solution computer solution by Charlie (2015-08-12 15:50:13)
Difficulty: 1 of 5Under Simpler probability problem? (in Probability)
Posted on 2015-08-11 (14 Comments)
re(2): I think I'm beginning to understand what Ady's saying by Charlie (2015-08-13 09:20:42)
I think I'm beginning to understand what Ady's saying by Charlie (2015-08-12 19:36:15)
re(4): solution by Charlie (2015-08-12 14:46:30)
simulation of 100 trials by Charlie (2015-08-12 12:27:43)
re(4): solution by Charlie (2015-08-12 12:08:07)
re: re. difficulty level by Charlie (2015-08-12 08:57:18)
re(2): solution by Charlie (2015-08-12 08:42:24)
Solution solution by Charlie (2015-08-11 15:56:22)
Difficulty: 3 of 5Under Positive Integer and Power Puzzle (in Logic)
Posted on 2015-08-10 (2 Comments)
Solution computer solution by Charlie (2015-08-10 19:23:20)
Difficulty: 1 of 5Under Oddday (in Numbers)
Posted on 2015-08-10 (4 Comments)
re: No math on vacation by Charlie (2015-08-11 15:55:16)
Difficulty: 3 of 5Under Clever counting (in Numbers)
Posted on 2015-08-07 (6 Comments)
re: Part b researched solution by Charlie (2015-08-08 08:20:18)
Solution Part b researched solution by Charlie (2015-08-07 23:04:25)
re(2): part a computer solution wrong? by Charlie (2015-08-07 22:27:09)
Solution part a computer solution by Charlie (2015-08-07 18:59:07)
Difficulty: 2 of 5Under Largest pandigital prime. (in Numbers)
Posted on 2015-08-07 (1 Comments)
Solution computer solution by Charlie (2015-08-07 12:21:30)
Difficulty: 3 of 5Under one 3 or one 7 puzzle (in Just Math)
Posted on 2015-08-06 (3 Comments)
Solution computer solution by Charlie (2015-08-06 13:30:07)
Difficulty: 3 of 5Under Factorial Ratio Sum Puzzle (in Calculus)
Posted on 2015-08-04 (3 Comments)
Solution computer solution: It quickly converges by Charlie (2015-08-04 09:14:25)
Difficulty: 2 of 5Under Odd and Even 2 (in Just Math)
Posted on 2015-08-03 (5 Comments)
Solution computer solution by Charlie (2015-08-03 10:15:05)
re: solution by Charlie (2015-08-03 09:53:39)
Difficulty: 3 of 5Under Ocean Anagram – Not (in Word Problems)
Posted on 2015-07-31 (4 Comments)
Solution re: a d1 solution by Charlie (2015-07-31 09:12:36)
Difficulty: 3 of 5Under Best guess (in Probability)
Posted on 2015-07-30 (3 Comments)
re(2): computer solution -- a mathematical-type formula by Charlie (2015-08-01 08:24:47)
Solution computer solution by Charlie (2015-07-30 14:56:26)
Difficulty: 3 of 5Under Red, White, and Blue (in Logic)
Posted on 2015-07-29 (4 Comments)
Solution computer proof by Charlie (2015-07-29 14:35:28)
Difficulty: 2 of 5Under Perfect Power Puzzle (in Just Math)
Posted on 2015-07-29 (5 Comments)
re: full solution........................SPOILER by Charlie (2015-07-29 10:16:47)
re: full solution........................SPOILER by Charlie (2015-07-29 10:00:18)
Solution computer solution by Charlie (2015-07-29 09:58:22)
Difficulty: 3 of 5Under No letters (in Cryptography)
Posted on 2015-07-27 (3 Comments)
Solution I learn to initialize arrays in VB 5 by Charlie (2015-07-27 14:20:25)
Difficulty: 3 of 5Under Integer Triangle Side Puzzle (in Shapes)
Posted on 2015-07-26 (1 Comments)
Solution computer solution by Charlie (2015-07-26 10:56:57)
Difficulty: 3 of 5Under Linear and Quadratic Sum Puzzle (in Just Math)
Posted on 2015-07-25 (3 Comments)
re: computer-aided solution by Charlie (2015-07-25 13:30:24)
Solution computer-aided solution by Charlie (2015-07-25 13:22:55)
Difficulty: 2 of 5Under Nine trolls (in Just Math)
Posted on 2015-07-23 (9 Comments)
re(2): computer solution by Charlie (2015-07-23 12:22:03)
re: computer solution by Charlie (2015-07-23 12:15:34)
Solution computer solution by Charlie (2015-07-23 11:57:51)
re: computer solution by Charlie (2015-07-23 11:37:25)
Some Thoughts only a start by Charlie (2015-07-23 08:27:41)
Difficulty: 3 of 5Under One of the countries (in Word Problems)
Posted on 2015-07-22 (2 Comments)
Solution computer solution by Charlie (2015-07-22 15:46:50)
Difficulty: 3 of 5Under Yearly Division (in Just Math)
Posted on 2015-07-22 (1 Comments)
Solution solution by Charlie (2015-07-22 13:39:52)
Difficulty: 3 of 5Under Initial Term Identification (in Sequences)
Posted on 2015-07-21 (3 Comments)
Solution electronically computed by Charlie (2015-07-21 15:08:06)
Difficulty: 2 of 5Under Phrase Reconstruction Puzzle (in Word Problems)
Posted on 2015-07-21 (5 Comments)
re: What's the point? by Charlie (2015-07-22 08:14:53)
Solution answer by Charlie (2015-07-21 11:09:44)
Difficulty: 2 of 5Under Guessing suit (in Probability)
Posted on 2015-07-20 (13 Comments)
Some Thoughts simulation by Charlie (2015-07-21 10:25:25)
re: senseless task ! by Charlie (2015-07-20 11:09:49)
Difficulty: 3 of 5Under Picking numbers (in Probability)
Posted on 2015-07-17 (7 Comments)
re: Solution by Charlie (2015-07-29 10:22:14)
Solution computer solution by Charlie (2015-07-17 15:11:20)
re: Analytical Solution (spoiler) by Charlie (2015-07-17 15:08:32)
Difficulty: 3 of 5Under Pasta wrestling (in Word Problems)
Posted on 2015-07-17 (1 Comments)
Solution solution by Charlie (2015-07-17 10:53:58)
Difficulty: 3 of 5Under Smallest Perfect Cube Puzzle (in Just Math)
Posted on 2015-07-15 (2 Comments)
Solution simulation of manual trials by Charlie (2015-07-15 16:19:57)
Solution computer assisted solution by Charlie (2015-07-15 16:03:18)
Difficulty: 2 of 5Under Pieces of eight (in Just Math)
Posted on 2015-07-15 (2 Comments)
Solution some computer aid by Charlie (2015-07-15 10:46:46)
Difficulty: 3 of 5Under Powers of Ten (in Sequences)
Posted on 2015-07-14 (7 Comments)
re: Pwerful answer (spoiler) by Charlie (2015-07-14 16:14:00)
Difficulty: 4 of 5Under Bean coloring (in Probability)
Posted on 2015-07-13 (11 Comments)
re(3):Correcting My previous analytical solution by Charlie (2015-07-15 21:42:51)
re(2):Correcting My previous analytical solution by Charlie (2015-07-15 16:39:37)
Solution Further exact values using UBASIC by Charlie (2015-07-14 10:42:50)
re: computer aided solution by Charlie (2015-07-13 19:44:27)
Solution computer aided solution by Charlie (2015-07-13 18:49:13)
Difficulty: 3 of 5Under Beginning and End (in Just Math)
Posted on 2015-07-11 (6 Comments)
The Fibonacci connection by Charlie (2015-07-12 08:52:04)
Solution More precision with UBASIC computer program by Charlie (2015-07-11 09:36:36)
Difficulty: 3 of 5Under Long Reverse Rigor (in Word Problems)
Posted on 2015-07-10 (3 Comments)
Solution words with 15 or more letters, with lengths by Charlie (2015-07-10 19:14:53)
Difficulty: 3 of 5Under Inverse Quadratic Sum Puzzle (in Just Math)
Posted on 2015-07-09 (1 Comments)
Solution steps with some internet help by Charlie (2015-07-09 12:56:06)
Difficulty: 3 of 5Under Inverse Expression Exercise (in Just Math)
Posted on 2015-07-07 (1 Comments)
Some Thoughts probabile solution by Charlie (2015-07-07 16:50:57)
Difficulty: 3 of 5Under From ab to yz (in Word Problems)
Posted on 2015-07-06 (8 Comments)
re: computer solution by Charlie (2015-07-06 16:11:55)
Solution computer solution by Charlie (2015-07-06 15:57:15)
Difficulty: 3 of 5Under Simultaneous Pythagorean Poser (in Just Math)
Posted on 2015-07-04 (4 Comments)
re: solution by Charlie (2015-07-04 16:00:25)
Difficulty: 3 of 5Under Quite a triplet (in Numbers)
Posted on 2015-07-02 (10 Comments)
re(4): computer solution -- prolonged search by Charlie (2015-07-04 08:06:14)
re(2): computer solution -- prolonged search by Charlie (2015-07-03 11:36:27)
re: more info by Charlie (2015-07-03 07:56:45)
Solution computer solution by Charlie (2015-07-02 15:49:37)
Difficulty: 2 of 5Under Chinatown's problem (in Numbers)
Posted on 2015-07-02 (3 Comments)
Solution solution with some explanation by Charlie (2015-07-02 09:19:53)
Difficulty: 4 of 5Under One 1 to Six 6's (in Probability)
Posted on 2015-07-01 (14 Comments)
re: Solution for n=2 and 3, and some observations by Charlie (2015-07-30 09:11:20)
re(4): computer aided solution by Charlie (2015-07-02 15:41:55)
re(2): computer aided solution by Charlie (2015-07-02 15:34:07)
re(3): computer aided solution by Charlie (2015-07-02 09:39:18)
Solution re(2): computer aided solution by Charlie (2015-07-02 09:09:49)
Solution computer aided solution by Charlie (2015-07-01 17:00:33)
Difficulty: 2 of 5Under Mathematical Term (in Word Problems)
Posted on 2015-07-01 (4 Comments)
Solution answer by Charlie (2015-07-01 10:15:27)
Difficulty: 3 of 5Under More than linear (in Just Math)
Posted on 2015-06-30 (1 Comments)
Solution computer solution by Charlie (2015-06-30 16:19:44)
Difficulty: 3 of 5Under How many subsets? (in Just Math)
Posted on 2015-06-29 (3 Comments)
Solution computer solution by Charlie (2015-06-29 19:43:37)
Difficulty: 2 of 5Under Ship Anagram - Not (in Word Problems)
Posted on 2015-06-29 (4 Comments)
re(2): Ahoy! (spoiler) by Charlie (2015-06-30 09:16:36)
Difficulty: 1 of 5Under Factorial creates prime (in Numbers)
Posted on 2015-06-26 (5 Comments)
Hints/Tips Would it help if ... by Charlie (2015-06-26 11:38:46)
Difficulty: 2 of 5Under It is not 8^5 (in Numbers)
Posted on 2015-06-24 (3 Comments)
Solution re: Solution (Spoiler) by Charlie (2015-06-24 09:48:19)
Difficulty: 3 of 5Under Cubic and Factorial Puzzle (in Just Math)
Posted on 2015-06-23 (1 Comments)
Solution computer solution by Charlie (2015-06-23 11:39:47)
Difficulty: 3 of 5Under Find the lowest n (in Numbers)
Posted on 2015-06-22 (4 Comments)
re: A few other n by Charlie (2015-06-23 07:24:20)
Difficulty: 3 of 5Under All possible integer determination (in Just Math)
Posted on 2015-06-20 (1 Comments)
Solution computer solution by Charlie (2015-06-20 14:44:33)
Difficulty: 4 of 5Under 7 idiomatic phrases (in Word Problems)
Posted on 2015-06-17 (2 Comments)
Some Thoughts a start by Charlie (2015-06-17 13:55:42)
Difficulty: 3 of 5Under One triplet out (in Numbers)
Posted on 2015-06-16 (3 Comments)
Solution computer solution by Charlie (2015-06-16 15:05:58)
Difficulty: 3 of 5Under Expression Quotient Puzzle (in Just Math)
Posted on 2015-06-16 (3 Comments)
re: Some, maybe all by Charlie (2015-06-16 12:08:54)
Difficulty: 2 of 5Under On his way to fitness (in Just Math)
Posted on 2015-06-15 (10 Comments)
Solution Using calculator app and Excel by Charlie (2015-06-16 08:59:42)
re: A geometrical approach by Charlie (2015-06-15 14:45:15)
Difficulty: 3 of 5Under Bivariate Quadratic Puzzle (in Just Math)
Posted on 2015-06-14 (2 Comments)
Solution computer exploration gives probable solution by Charlie (2015-06-14 11:28:53)
Difficulty: 3 of 5Under Yearly Diophantine Puzzle (in Just Math)
Posted on 2015-06-12 (1 Comments)
Solution computer solution by Charlie (2015-06-12 15:23:04)
Difficulty: 3 of 5Under p^10 is special (in Numbers)
Posted on 2015-06-12 (1 Comments)
Solution computer solution by Charlie (2015-06-12 11:01:57)
Difficulty: 1 of 5Under Lefties and righties (in Logic)
Posted on 2015-06-10 (4 Comments)
Solution solution by Charlie (2015-06-10 11:11:41)
Difficulty: 3 of 5Under Cube root sum equality puzzle (in Just Math)
Posted on 2015-06-09 (2 Comments)
Solution computer solution by Charlie (2015-06-09 15:54:15)
Difficulty: 3 of 5Under A chain of five (in Word Problems)
Posted on 2015-06-08 (2 Comments)
Solution computer solution by Charlie (2015-06-08 21:59:37)
Difficulty: 2 of 5Under Eleven Letter Exercise (in Word Problems)
Posted on 2015-06-08 (3 Comments)
re(2): answer by Charlie (2015-06-11 08:45:02)
re: answer by Charlie (2015-06-08 10:20:54)
Difficulty: 3 of 5Under Find Points, Maximise Ratio (in Shapes)
Posted on 2015-06-05 (6 Comments)
re(3): solution (continued) by Charlie (2015-06-05 16:02:17)
re(2): solution (continued) by Charlie (2015-06-05 16:00:52)
re: solution by Charlie (2015-06-05 15:59:04)
Solution computer finding by Charlie (2015-06-05 15:51:30)
Difficulty: 3 of 5Under 5 76993 408621 (in Numbers)
Posted on 2015-06-04 (3 Comments)
Solution computer aided solution by Charlie (2015-06-04 14:28:11)
Difficulty: 3 of 5Under Three Quotients and Integer Puzzle (in Just Math)
Posted on 2015-06-03 (4 Comments)
Solution I get (with computer program) by Charlie (2015-06-03 15:56:14)
Difficulty: 2 of 5Under Logical, or not? (in General)
Posted on 2015-06-01 (4 Comments)
Solution solution by Charlie (2015-06-01 12:35:04)
Difficulty: 4 of 5Under Just vowels (in General)
Posted on 2015-05-29 (9 Comments)
Some Thoughts My take on it by Charlie (2015-05-29 15:56:40)
Difficulty: 2 of 5Under Rational or not? (in Just Math)
Posted on 2015-05-29 (5 Comments)
re(2): solution by Charlie (2015-05-31 14:09:48)
Solution solution by Charlie (2015-05-29 10:09:45)
Difficulty: 3 of 5Under No neighbors allowed (in Numbers)
Posted on 2015-05-22 (2 Comments)
Solution solution by Charlie (2015-05-22 15:37:25)
Difficulty: 2 of 5Under One, two, eight etc (in Numbers)
Posted on 2015-05-22 (2 Comments)
Solution adding overbars for large squares by Charlie (2015-05-22 13:05:09)
Solution computer solution not considering overlining for large squares by Charlie (2015-05-22 10:52:38)
Difficulty: 3 of 5Under Cuboid Concern (in Shapes)
Posted on 2015-05-21 (2 Comments)
Solution If I didn't make any mistakes along the way by Charlie (2015-05-21 16:16:16)
Difficulty: 2 of 5Under Back to throne (in Probability)
Posted on 2015-05-21 (3 Comments)
Solution computer exploration and solution by Charlie (2015-05-21 10:34:51)
Difficulty: 2 of 5Under Three consecutive letters (in Word Problems)
Posted on 2015-05-20 (4 Comments)
Solution re: Other examples by Charlie (2015-05-21 10:49:16)
Difficulty: 3 of 5Under 3 squares and 5 ways puzzle (in Just Math)
Posted on 2015-05-19 (1 Comments)
Solution computer solution by Charlie (2015-05-19 15:11:37)
Difficulty: 3 of 5Under 7G vs 7B (in General)
Posted on 2015-05-18 (2 Comments)
Solution No Subject by Charlie (2015-05-18 22:14:51)
Difficulty: 1 of 5Under A sequence or not a sequence? (in Logic)
Posted on 2015-05-18 (3 Comments)
Some Thoughts In China and in Ancient Rome by Charlie (2015-05-18 11:14:30)
Some Thoughts Of course... by Charlie (2015-05-18 09:54:09)
Difficulty: 2 of 5Under Random numbers sum together (in Probability)
Posted on 2015-05-15 (3 Comments)
re(2): solution: as presented and with a complication by Charlie (2015-05-15 13:56:06)
Solution solution: as presented and with a complication by Charlie (2015-05-15 11:01:51)
Difficulty: 2 of 5Under Sextic Settlement (in Just Math)
Posted on 2015-05-13 (6 Comments)
re(2): Counterexample by Charlie (2015-05-13 11:20:47)
Difficulty: 2 of 5Under How far can you go? (in Numbers)
Posted on 2015-05-12 (6 Comments)
Solution computer exploration by Charlie (2015-05-12 10:26:36)
Difficulty: 3 of 5Under Cabbagehead’s neighbors (in Word Problems)
Posted on 2015-05-08 (3 Comments)
Some Thoughts computer findings by Charlie (2015-05-08 10:51:07)
Difficulty: 4 of 5Under Rhyme time (in Word Problems)
Posted on 2015-05-07 (6 Comments)
Some Thoughts a further start by Charlie (2015-05-07 09:46:34)
Difficulty: 3 of 5Under 4 primes (in Numbers)
Posted on 2015-05-06 (3 Comments)
Solution computer solution by Charlie (2015-05-06 15:40:46)
Difficulty: 2 of 5Under Poor primes (in Numbers)
Posted on 2015-05-04 (1 Comments)
Solution computer solution by Charlie (2015-05-04 19:22:39)
Difficulty: 3 of 5Under Odd men out (in Logic)
Posted on 2015-04-29 (6 Comments)
re: Special numbers by Charlie (2015-04-30 11:00:43)
Solution starting out by Charlie (2015-04-29 10:20:14)
Difficulty: 3 of 5Under Largest palindrome (in Numbers)
Posted on 2015-04-27 (4 Comments)
re(2): program solution by Charlie (2015-04-28 08:11:18)
Solution program solution by Charlie (2015-04-27 19:23:24)
Difficulty: 3 of 5Under Not solvable by computer (?) (in Word Problems)
Posted on 2015-04-24 (6 Comments)
Solution computer plus human finds only one by Charlie (2015-04-24 12:59:57)
Difficulty: 3 of 5Under Downward Pair Reading (in Word Problems)
Posted on 2015-04-24 (5 Comments)
re: solution(s) by Charlie (2015-04-24 21:21:09)
Solution computer solution by Charlie (2015-04-24 11:04:56)
Difficulty: 3 of 5Under Consecutive Count (in Sequences)
Posted on 2015-04-23 (4 Comments)
Solution revised program by Charlie (2015-04-24 21:49:59)
Solution computer solution by Charlie (2015-04-23 15:29:35)
Difficulty: 4 of 5Under Three's a company (in General)
Posted on 2015-04-23 (7 Comments)
re(2): And #11 by Charlie (2015-04-26 08:34:23)
Some Thoughts 1,2,3,,,7,8,,10 by Charlie (2015-04-23 09:20:04)
Difficulty: 3 of 5Under Consecutive Deletion (in Just Math)
Posted on 2015-04-22 (6 Comments)
Solution computer solution by Charlie (2015-04-22 14:20:58)
Difficulty: 3 of 5Under Geographic entities (in General)
Posted on 2015-04-20 (3 Comments)
Some Thoughts re(2): computer assisted solution /bonus task by Charlie (2015-04-21 07:45:16)
Solution computer assisted solution by Charlie (2015-04-20 15:28:27)
Difficulty: 2 of 5Under N as a sum of factorials (in Just Math)
Posted on 2015-04-20 (1 Comments)
Solution solution by Charlie (2015-04-20 09:56:06)
Difficulty: 3 of 5Under Some powers decomposed (in Numbers)
Posted on 2015-04-16 (5 Comments)
re: Thoughts from OEIS by Charlie (2015-04-17 11:43:19)
Solution computer solution: differently ordered list by Charlie (2015-04-17 07:59:36)
Difficulty: 3 of 5Under Number Count Conclusion (in Just Math)
Posted on 2015-04-15 (4 Comments)
Solution computer solution by Charlie (2015-04-15 16:25:15)
Difficulty: 2 of 5Under 2^(10n) (in Numbers)
Posted on 2015-04-15 (9 Comments)
re(4): worked out by Charlie (2015-04-17 14:09:41)
re(2): worked out by Charlie (2015-04-16 08:06:54)
Solution worked out by Charlie (2015-04-15 09:01:19)
Difficulty: 3 of 5Under Integer Triangle Trial (in Shapes)
Posted on 2015-04-14 (1 Comments)
Solution solution by Charlie (2015-04-14 10:42:14)
Difficulty: 3 of 5Under Non-empty sets element count (in Just Math)
Posted on 2015-04-13 (5 Comments)
Solution solution by Charlie (2015-04-13 14:22:49)
Difficulty: 3 of 5Under Deux Power Divisibility (in Algorithms)
Posted on 2015-04-12 (4 Comments)
Some Thoughts continuation of Jer's table by Charlie (2015-04-12 13:27:24)
Difficulty: 3 of 5Under Long chain (in Numbers)
Posted on 2015-04-10 (7 Comments)
Solution lesson learned by Charlie (2015-04-11 08:32:42)
Some Thoughts computer exploration by Charlie (2015-04-10 20:46:20)
Difficulty: 4 of 5Under From product to town (in Word Problems)
Posted on 2015-04-10 (2 Comments)
Solution computer assisted solution by Charlie (2015-04-10 11:07:50)
Difficulty: 4 of 5Under Bright light (in Science)
Posted on 2015-04-09 (9 Comments)
re: Interesting question. by Charlie (2015-04-10 07:35:28)
comparison with an actual case by Charlie (2015-04-09 20:05:18)
re(2): GSP Model disagrees with the previous posts by Charlie (2015-04-09 17:14:21)
re: GSP Model disagrees with the previous posts by Charlie (2015-04-09 16:15:01)
what I get by Charlie (2015-04-09 13:03:18)
Difficulty: 3 of 5Under Some sums (in Numbers)
Posted on 2015-04-07 (3 Comments)
Solution computer solution by Charlie (2015-04-07 14:34:22)
Difficulty: 2 of 5Under Buddy, can you spare a buck? (in Numbers)
Posted on 2015-04-03 (3 Comments)
Hmmm... by Charlie (2015-04-03 10:13:26)
Difficulty: 3 of 5Under Domain and Range (in Just Math)
Posted on 2015-04-02 (1 Comments)
Some Thoughts Somewhat satisfying answer by Charlie (2015-04-02 14:13:46)
Difficulty: 3 of 5Under The Case of the Mixtup Calendar (in General)
Posted on 2015-04-02 (1 Comments)
Some Thoughts I think.... by Charlie (2015-04-02 10:00:39)
Difficulty: 3 of 5Under Reflection Matrix (in Just Math)
Posted on 2015-04-01 (4 Comments)
Solution completing the derivation by Charlie (2015-04-02 08:50:32)
Solution researched solution by Charlie (2015-04-01 16:10:17)
Difficulty: 3 of 5Under Function Function Function Function Foray (in Just Math)
Posted on 2015-03-31 (2 Comments)
Solution computer solution to both parts; analytic solution for part 2 by Charlie (2015-03-31 14:43:39)
Difficulty: 3 of 5Under Nine times SSD (in Just Math)
Posted on 2015-03-30 (1 Comments)
Solution computer solution by Charlie (2015-03-30 22:04:20)
Difficulty: 2 of 5Under How many solutions? (in Just Math)
Posted on 2015-03-30 (3 Comments)
Solution solution by Charlie (2015-03-30 09:12:24)
Difficulty: 3 of 5Under Neighboring tickets (in Numbers)
Posted on 2015-03-26 (2 Comments)
Solution computer solution by Charlie (2015-03-26 15:21:20)
Difficulty: 2 of 5Under Island Adventure (in Liars and Knights)
Posted on 2015-03-26 (3 Comments)
Solution solution by Charlie (2015-03-26 10:02:29)
Difficulty: 3 of 5Under Zero Sum Expression (in Just Math)
Posted on 2015-03-25 (2 Comments)
Some Thoughts computer exploration by Charlie (2015-03-25 15:44:18)
Difficulty: 3 of 5Under Win some, lose some II (in Just Math)
Posted on 2015-03-25 (1 Comments)
Solution solution by Charlie (2015-03-25 08:41:08)
Difficulty: 3 of 5Under Long list (in Word Problems)
Posted on 2015-03-24 (2 Comments)
Some Thoughts a computer list by Charlie (2015-03-24 15:28:03)
Difficulty: 3 of 5Under Growing fast (in Numbers)
Posted on 2015-03-23 (4 Comments)
re: correction- ............... see before solving by Charlie (2015-03-24 07:43:06)
Just a note by Charlie (2015-03-23 15:45:30)
Difficulty: 3 of 5Under Rectangular Rearrangement Resolution (in Shapes)
Posted on 2015-03-20 (5 Comments)
further by Charlie (2015-03-20 11:00:28)
Difficulty: 3 of 5Under 123456789 scrambled (in Numbers)
Posted on 2015-03-19 (6 Comments)
re(3): computer solution by Charlie (2015-03-20 07:49:52)
Solution computer solution by Charlie (2015-03-19 15:29:27)
Difficulty: 3 of 5Under Isosceles Crease (in Shapes)
Posted on 2015-03-19 (2 Comments)
Solution solution by Charlie (2015-03-19 11:28:48)
Difficulty: 3 of 5Under +Q-U : Quite Unusual (in Word Problems)
Posted on 2015-03-17 (2 Comments)
Some Thoughts list by Charlie (2015-03-17 15:21:53)
Difficulty: 2 of 5Under Log Inequality Illation (in Just Math)
Posted on 2015-03-17 (4 Comments)
re(2): solution by Charlie (2015-03-18 07:52:22)
Solution solution by Charlie (2015-03-17 09:56:07)
Difficulty: 3 of 5Under Pentagon Fraction Minimizing (in Just Math)
Posted on 2015-03-16 (7 Comments)
Solution solution by Charlie (2015-03-16 13:16:19)
Difficulty: 2 of 5Under Musical Term - Not (in Word Problems)
Posted on 2015-03-16 (2 Comments)
Solution re: full solution........................SPOILER by Charlie (2015-03-16 10:06:02)
Difficulty: 3 of 5Under Linear and Quadratic Square (in Just Math)
Posted on 2015-03-15 (4 Comments)
Solution computer solution by Charlie (2015-03-15 12:52:08)
Difficulty: 3 of 5Under Five Cards III (in Logic)
Posted on 2015-03-13 (3 Comments)
Solution computer solution by Charlie (2015-03-13 15:42:15)
Difficulty: 3 of 5Under Location, location, location (in Geometry)
Posted on 2015-03-12 (8 Comments)
re(4): To answer the question... (a GSP picture is worth a thousand words) by Charlie (2015-03-14 08:02:57)
re: To answer the question... by Charlie (2015-03-12 19:58:01)
Difficulty: 3 of 5Under Deux Digit Deduction II (in Just Math)
Posted on 2015-03-12 (4 Comments)
Solution last two digits in base 12 by Charlie (2015-03-12 10:56:05)
Difficulty: 3 of 5Under Root sum equals integer (in Just Math)
Posted on 2015-03-10 (7 Comments)
re(3): solution & playing around by Charlie (2015-03-10 15:54:20)
re: solution & playing around by Charlie (2015-03-10 14:40:30)
Solution with the assistance of a computer language that can handle complex intermediate terms by Charlie (2015-03-10 14:21:27)
Difficulty: 3 of 5Under Unity Root Count (in Just Math)
Posted on 2015-03-09 (2 Comments)
re: solution -- showing a sample of the ways of each product by Charlie (2015-03-09 21:49:09)
Solution solution by Charlie (2015-03-09 17:39:29)
Difficulty: 4 of 5Under 3 sets of primes (in Numbers)
Posted on 2015-03-08 (1 Comments)
Solution computer solution by Charlie (2015-03-08 12:53:52)
Difficulty: 3 of 5Under Divisor Count Conclusion (in Just Math)
Posted on 2015-03-06 (2 Comments)
Solution re: solution -- same answer, a different way by Charlie (2015-03-06 10:39:41)
Difficulty: 3 of 5Under Painting high dimension cubes (in Shapes)
Posted on 2015-03-05 (4 Comments)
re: Thoughts by Charlie (2015-03-14 07:52:06)
Solution solution by Charlie (2015-03-05 15:41:41)
Difficulty: 2 of 5Under Find the last member (in Sequences)
Posted on 2015-03-05 (1 Comments)
Solution computer solution by Charlie (2015-03-05 10:48:21)
Difficulty: 3 of 5Under Line Ratio Resolution (in Shapes)
Posted on 2015-03-04 (4 Comments)
re(3): Possible solution -- but using Geometers Sketchpad by Charlie (2015-03-05 11:07:20)
re: Possible solution -- but using Geometers Sketchpad by Charlie (2015-03-05 08:01:11)
Difficulty: 2 of 5Under Minimizing Perimeter (in Shapes)
Posted on 2015-03-04 (15 Comments)
re(6): NO DICE.....not a spoiler by Charlie (2015-03-06 19:37:44)
re: A triangle that works, may not be minimum (spoiler) by Charlie (2015-03-04 10:17:17)
Solution computer solution by Charlie (2015-03-04 09:33:20)
Difficulty: 3 of 5Under Contradict Goldbach (in Numbers)
Posted on 2015-03-03 (3 Comments)
Solution computer assisted solution by Charlie (2015-03-03 13:24:17)
Difficulty: 2 of 5Under Phrase a question II (in Numbers)
Posted on 2015-03-03 (2 Comments)
re: What is... (solution) by Charlie (2015-03-03 11:01:33)
Difficulty: 3 of 5Under Rearranged Resolution II (in Word Problems)
Posted on 2015-03-02 (7 Comments)
re: computer solutions by Charlie (2015-03-02 14:09:24)
Solution computer solutions by Charlie (2015-03-02 14:05:05)
Difficulty: 3 of 5Under Academia, defeated, yesterday (in Word Problems)
Posted on 2015-02-26 (6 Comments)
re(2): computer solutions by Charlie (2015-02-26 19:52:38)
Solution computer solutions by Charlie (2015-02-26 12:07:52)
Difficulty: 2 of 5Under Next year vs the current year (in Numbers)
Posted on 2015-02-25 (5 Comments)
Solution with some computer assistance by Charlie (2015-02-25 10:50:12)
Difficulty: 1 of 5Under Composite prime (in Numbers)
Posted on 2015-02-24 (2 Comments)
Solution smallest and beyond--computer exploration (spoiler) by Charlie (2015-02-24 11:11:57)
Difficulty: 3 of 5Under Be consistent (in Numbers)
Posted on 2015-02-20 (3 Comments)
Some Thoughts first thoughts by Charlie (2015-02-20 13:15:07)
Difficulty: 2 of 5Under Not too much (in Numbers)
Posted on 2015-02-20 (8 Comments)
Some Thoughts re(2): Is this valid? no ! - partial spoiler by Charlie (2015-02-20 15:16:45)
Difficulty: 3 of 5Under Double a triangle (in Sequences)
Posted on 2015-02-19 (3 Comments)
Some Thoughts The first few pairs by Charlie (2015-02-19 14:07:43)
Difficulty: 2 of 5Under Repeated Words (in Word Problems)
Posted on 2015-02-19 (4 Comments)
Solution re: Could it be . . .? (spoiler added) by Charlie (2015-02-19 10:49:46)
Difficulty: 3 of 5Under A modified die (in Numbers)
Posted on 2015-02-18 (3 Comments)
Solution computer solution by Charlie (2015-02-18 14:07:55)
Difficulty: 2 of 5Under The final quantity (in Numbers)
Posted on 2015-02-18 (4 Comments)
Solution computer solution by Charlie (2015-02-18 10:27:51)
Difficulty: 3 of 5Under Approximating radicals (in Numbers)
Posted on 2015-02-17 (4 Comments)
Some Thoughts discussion by Charlie (2015-02-17 16:31:49)
Difficulty: 2 of 5Under z is a word (in Word Problems)
Posted on 2015-02-17 (1 Comments)
Solution solution by Charlie (2015-02-17 11:18:27)
Difficulty: 3 of 5Under Golfer Gauge (in Word Problems)
Posted on 2015-02-16 (4 Comments)
Some Thoughts (ii) by Charlie (2015-02-16 15:25:52)
Difficulty: 2 of 5Under Phrase a question I (in Numbers)
Posted on 2015-02-16 (2 Comments)
Solution computer solutions by Charlie (2015-02-16 09:19:51)
Difficulty: 3 of 5Under Distinct Values Derivation (in General)
Posted on 2015-02-15 (3 Comments)
Solution re: computer solution -- what was I thinking? by Charlie (2015-02-18 19:43:50)
Solution computer solution by Charlie (2015-02-15 14:18:04)
Difficulty: 3 of 5Under An ancient Egyptian problem (in Just Math)
Posted on 2015-02-13 (5 Comments)
Solution computer solutions by Charlie (2015-02-13 15:20:11)
Difficulty: 2 of 5Under Bound the product (in Numbers)
Posted on 2015-02-13 (4 Comments)
Some Thoughts Some facts that may aid in finding a proof by Charlie (2015-02-13 10:49:00)
Difficulty: 3 of 5Under Date Deduction II (in General)
Posted on 2015-02-12 (1 Comments)
Solution solution by Charlie (2015-02-12 15:59:49)
Difficulty: 2 of 5Under Inequality (in Just Math)
Posted on 2015-02-11 (5 Comments)
re: Trigonometric solution by Charlie (2015-02-12 08:57:31)
Solution graphic solution by Charlie (2015-02-11 10:39:34)
Difficulty: 3 of 5Under Shared by squares (in Algorithms)
Posted on 2015-02-10 (3 Comments)
Some Thoughts re: A start by Charlie (2015-02-10 19:44:38)
Some Thoughts some thoughts by Charlie (2015-02-10 19:26:46)
Difficulty: 3 of 5Under Total Triplet Treat (in Shapes)
Posted on 2015-02-09 (1 Comments)
Solution computer solution by Charlie (2015-02-09 14:40:57)
Difficulty: 2 of 5Under A simple gematria (in Numbers)
Posted on 2015-02-09 (3 Comments)
Some Thoughts a few proper names by Charlie (2015-02-09 11:35:24)
Difficulty: 3 of 5Under The LSD of Prime Numbers (in Numbers)
Posted on 2015-02-08 (1 Comments)
Solution computer solution by Charlie (2015-02-08 16:15:06)
Difficulty: 3 of 5Under Very very colourful (in General)
Posted on 2015-02-06 (2 Comments)
Some Thoughts 5 through 8 by Charlie (2015-02-06 10:19:18)
Difficulty: 3 of 5Under Rooting for Roots (in Just Math)
Posted on 2015-02-04 (2 Comments)
Solution solution by Charlie (2015-02-04 15:25:24)
Difficulty: 2 of 5Under Mr Mar & Mrs Bles (in Numbers)
Posted on 2015-02-04 (1 Comments)
Solution solution by Charlie (2015-02-04 11:04:05)
Difficulty: 3 of 5Under Palindromes from Digit Sum Series (in Numbers)
Posted on 2015-02-03 (1 Comments)
Solution open ended solution/discussion by Charlie (2015-02-03 14:31:41)
Difficulty: 3 of 5Under Happy Numbers (in Numbers)
Posted on 2015-02-02 (2 Comments)
Solution computer solution by Charlie (2015-02-02 15:29:50)
Difficulty: 3 of 5Under Ellis Number (in Numbers)
Posted on 2015-01-31 (1 Comments)
Solution computer solution by Charlie (2015-01-31 14:53:59)
Difficulty: 3 of 5Under Find From Floor (in Just Math)
Posted on 2015-01-30 (4 Comments)
Solution solution by Charlie (2015-01-30 14:36:09)
Difficulty: 2 of 5Under Integer Triplets with a Difference (in Numbers)
Posted on 2015-01-30 (6 Comments)
Solution computer solution by Charlie (2015-01-30 10:31:52)
Difficulty: 3 of 5Under A Self-Terminating Sequence (in Numbers)
Posted on 2015-01-29 (1 Comments)
Solution computer solution by Charlie (2015-01-29 14:41:58)
Difficulty: 3 of 5Under Date Count Conclusion (in General)
Posted on 2015-01-29 (1 Comments)
Solution computer solution (spoiler) by Charlie (2015-01-29 09:50:44)
Difficulty: 3 of 5Under Phrase Anagram Ponder (in Word Problems)
Posted on 2015-01-28 (5 Comments)
Used an anagram program for IV (spoiler for IV) by Charlie (2015-01-28 13:09:49)
II by Charlie (2015-01-28 12:52:18)
Difficulty: 2 of 5Under ProSum Numbers (in Numbers)
Posted on 2015-01-28 (5 Comments)
looking farther -- the lowest 4-sequence by Charlie (2015-01-28 15:05:54)
re(2): computer solution -- corrected program by Charlie (2015-01-28 13:38:55)
Solution computer solution by Charlie (2015-01-28 11:19:45)
Difficulty: 3 of 5Under Hat #10 (in Word Problems)
Posted on 2015-01-27 (4 Comments)
re: some computer findings by Charlie (2015-01-28 07:37:28)
Some Thoughts some computer findings by Charlie (2015-01-27 15:41:41)
Difficulty: 3 of 5Under Integral Proof (in Numbers)
Posted on 2015-01-26 (3 Comments)
Some Thoughts no proof, but the integer is... (spoiler) by Charlie (2015-01-26 13:24:51)
Difficulty: 3 of 5Under Deux Difference Deduction (in Sequences)
Posted on 2015-01-23 (8 Comments)
Solution computer solution by Charlie (2015-01-23 15:20:44)
Difficulty: 2 of 5Under What price glory? (in Games)
Posted on 2015-01-22 (5 Comments)
Solution If there isn't an even better strategy... (spoiler?) by Charlie (2015-01-22 11:13:59)
Difficulty: 3 of 5Under Deux Digit Deduction (in Just Math)
Posted on 2015-01-21 (2 Comments)
Solution computer solution -- last 6 digits of each by Charlie (2015-01-21 12:52:16)
Difficulty: 1 of 5Under Not hehe (in Word Problems)
Posted on 2015-01-21 (5 Comments)
Some Thoughts probably not one of the two by Charlie (2015-01-21 10:04:33)
Difficulty: 2 of 5Under 4 clues (in Numbers)
Posted on 2015-01-19 (3 Comments)
Solution computer solution by Charlie (2015-01-19 11:47:55)
Difficulty: 3 of 5Under Chinese New Year (in General)
Posted on 2015-01-16 (8 Comments)
re: computer solution by Charlie (2015-01-19 07:48:02)
Solution re(2): computer solution -- the JavaScript code by Charlie (2015-01-17 12:14:08)
re(2): computer solution by Charlie (2015-01-17 08:45:48)
re: computer solution -- the JavaScript code by Charlie (2015-01-16 20:38:08)
Solution computer solution by Charlie (2015-01-16 20:30:14)
testing by Charlie (2015-01-16 15:16:05)
Difficulty: 2 of 5Under Squares and Rectangles II (in Just Math)
Posted on 2015-01-16 (2 Comments)
detail on the rectangle counts by Charlie (2015-01-16 10:10:39)
Difficulty: 3 of 5Under Paramount Polygon Poser (in Shapes)
Posted on 2015-01-15 (3 Comments)
Solution computer assisted solution by Charlie (2015-01-15 10:14:13)
Difficulty: 3 of 5Under Three conditions define a triplet (in Just Math)
Posted on 2015-01-14 (2 Comments)
Solution computer solution by Charlie (2015-01-14 22:24:18)
Difficulty: 2 of 5Under Square Sum Settlement (in Just Math)
Posted on 2015-01-14 (3 Comments)
Solution computer solution (spoiler) by Charlie (2015-01-14 10:47:33)
Difficulty: 3 of 5Under Celsius Fahrenheit Check (in Just Math)
Posted on 2015-01-13 (1 Comments)
Solution not taking up the extra challenge--(spoiler) by Charlie (2015-01-13 14:38:01)
Difficulty: 3 of 5Under Find the remainder (in Just Math)
Posted on 2015-01-09 (3 Comments)
Solution re: possible solution (spoiler) -- computer confirmation by Charlie (2015-01-09 10:45:34)
Difficulty: 3 of 5Under Units Digit Determination (in Just Math)
Posted on 2015-01-07 (3 Comments)
Solution corrected computer summation by Charlie (2015-01-08 07:59:42)
Solution Adding up those 9-digit numbers by Charlie (2015-01-07 15:12:43)
Difficulty: 2 of 5Under Cows and buffaloes. (in Just Math)
Posted on 2015-01-07 (2 Comments)
Solution computer solution by Charlie (2015-01-07 10:30:39)
Difficulty: 2 of 5Under More than a million, less than ten (in Just Math)
Posted on 2015-01-06 (4 Comments)
Solution re(2): More than 3000, less than 8, computer solutions by Charlie (2015-01-09 08:29:13)
Solution More than 3000, less than 8, computer solutions by Charlie (2015-01-06 09:30:05)
Difficulty: 3 of 5Under Dates data distribution (in Just Math)
Posted on 2015-01-05 (3 Comments)
re(2): computer-aided solution by Charlie (2015-01-05 21:18:59)
Solution computer-aided solution by Charlie (2015-01-05 15:54:59)
Difficulty: 3 of 5Under Sum Productive Digits (in Just Math)
Posted on 2014-12-31 (2 Comments)
Solution computer solutions by Charlie (2014-12-31 12:14:30)
Difficulty: 2 of 5Under A simple inequality (in Just Math)
Posted on 2014-12-31 (4 Comments)
Some Thoughts no proof--just demonstration by Charlie (2014-12-31 11:08:03)
Difficulty: 3 of 5Under Binomial Baffle (in Just Math)
Posted on 2014-12-30 (2 Comments)
Solution computer solution by Charlie (2014-12-30 14:35:48)
Difficulty: 2 of 5Under Neither is prime (in Just Math)
Posted on 2014-12-30 (2 Comments)
Solution 10101 by Charlie (2014-12-30 10:55:15)
Difficulty: 2 of 5Under Reverse Role II (in Just Math)
Posted on 2014-12-29 (2 Comments)
computer solution by Charlie (2014-12-29 09:56:16)
Difficulty: 3 of 5Under Region Area Ascertainment (in Just Math)
Posted on 2014-12-28 (4 Comments)
re: My region isn't reaching (spoiler) by Charlie (2014-12-28 12:02:52)
Difficulty: 3 of 5Under Three Digit Travail (in Probability)
Posted on 2014-12-26 (1 Comments)
Solution computer solution by Charlie (2014-12-26 14:58:12)
Difficulty: 3 of 5Under Hexadecimal Digit Travail (in Just Math)
Posted on 2014-12-25 (5 Comments)
re(4): computer solution by Charlie (2014-12-25 20:55:51)
re(2): computer solution by Charlie (2014-12-25 18:30:15)
Solution computer solution by Charlie (2014-12-25 14:01:32)
Difficulty: 3 of 5Under Pie Pieces (in Just Math)
Posted on 2014-12-24 (2 Comments)
Solution solutions by 2 methods, computer aided by Charlie (2014-12-24 14:00:42)
Difficulty: 3 of 5Under Omega to Alpha Observation (in Just Math)
Posted on 2014-12-23 (5 Comments)
Solution computer solutions by Charlie (2014-12-23 15:09:46)
Difficulty: 2 of 5Under Count the Liars (in Liars and Knights)
Posted on 2014-12-23 (6 Comments)
re: Figures don't lie, but liars do figure (spoiler) by Charlie (2014-12-23 11:15:55)
Difficulty: 3 of 5Under 2014 Prime Treat (in Probability)
Posted on 2014-12-22 (1 Comments)
Solution computer solution and exploration by Charlie (2014-12-22 15:52:52)
Difficulty: 3 of 5Under LCM 540 (in Just Math)
Posted on 2014-12-22 (10 Comments)
re: No Subject by Charlie (2014-12-22 12:31:37)
Difficulty: 3 of 5Under Divisible by 28 (in Just Math)
Posted on 2014-12-21 (4 Comments)
Solution computer solution by Charlie (2014-12-21 21:08:21)
Difficulty: 3 of 5Under Arithmetic Numbers Enumeration (in Sequences)
Posted on 2014-12-19 (2 Comments)
Solution computer solution by Charlie (2014-12-19 15:29:55)
Difficulty: 3 of 5Under Origamic Revisited (in Shapes)
Posted on 2014-12-19 (1 Comments)
Some Thoughts playing with GSP by Charlie (2014-12-19 10:49:33)
Difficulty: 2 of 5Under Compare sizes (in Just Math)
Posted on 2014-12-18 (3 Comments)
Solution computer solution by Charlie (2014-12-18 20:24:15)
Difficulty: 2 of 5Under m & n (in Just Math)
Posted on 2014-12-18 (2 Comments)
Solution computer-aided solution by Charlie (2014-12-18 09:53:58)
Difficulty: 3 of 5Under Floor Fulfilment (in Just Math)
Posted on 2014-12-17 (2 Comments)
Solution computer evaluation by Charlie (2014-12-17 13:44:55)
Difficulty: 3 of 5Under Power Sum Poser (in Just Math)
Posted on 2014-12-16 (2 Comments)
Solution computer solution by Charlie (2014-12-16 15:22:16)
Difficulty: 3 of 5Under Cash and chit (in General)
Posted on 2014-12-15 (1 Comments)
Solution computer solution by Charlie (2014-12-15 13:47:25)
Difficulty: 3 of 5Under Cube Difference Deduction (in Just Math)
Posted on 2014-12-12 (2 Comments)
Solution computer solution by Charlie (2014-12-12 17:48:48)
Difficulty: 3 of 5Under Trigo inequality (in Just Math)
Posted on 2014-12-11 (20 Comments)
Some Thoughts re(5): solution. Useful (it's to be hoped) table by Charlie (2014-12-14 08:13:24)
re(3): solution by Charlie (2014-12-13 13:17:10)
Some Thoughts re: solution by Charlie (2014-12-13 08:07:18)
Question re: solution by Charlie (2014-12-12 07:45:30)
Difficulty: 3 of 5Under Year Yearn 2 (in General)
Posted on 2014-12-11 (4 Comments)
Solution between 1000 and 3000 -- computer solution by Charlie (2014-12-11 08:48:22)
Difficulty: 2 of 5Under Eight distances (in Just Math)
Posted on 2014-12-10 (4 Comments)
Solution can't be sure by Charlie (2014-12-10 10:12:45)
Difficulty: 3 of 5Under Distinct sod (in Just Math)
Posted on 2014-12-09 (1 Comments)
Solution computer solution by Charlie (2014-12-09 11:23:28)
Difficulty: 3 of 5Under Out of this word (in Word Problems)
Posted on 2014-12-08 (9 Comments)
Solution Most of a solution by Charlie (2014-12-08 10:26:15)
Difficulty: 3 of 5Under Two squares in a circle (in Geometry)
Posted on 2014-12-05 (4 Comments)
Solution solution by Charlie (2014-12-05 15:20:18)
Difficulty: 3 of 5Under Going North-East (in Just Math)
Posted on 2014-12-05 (4 Comments)
re: Another way to avoid tedium. by Charlie (2014-12-07 10:32:56)
Solution solution: computer used, to avoid tedium by Charlie (2014-12-05 09:40:23)
Difficulty: 3 of 5Under So close, but no closer... (in Just Math)
Posted on 2014-12-04 (5 Comments)
Solution computer assisted solution by Charlie (2014-12-04 14:21:37)
Difficulty: 4 of 5Under Test #7 (in Word Problems)
Posted on 2014-12-03 (7 Comments)
Solution computer solution by Charlie (2014-12-03 14:01:05)
Difficulty: 2 of 5Under Sibling Birthday Baffle (in Logic)
Posted on 2014-12-03 (1 Comments)
Solution answer by Charlie (2014-12-03 11:28:39)
Difficulty: 3 of 5Under Floor Equation (in Just Math)
Posted on 2014-12-02 (2 Comments)
Solution solution by Charlie (2014-12-02 14:02:29)
Difficulty: 3 of 5Under Consecutive Placement - Not (in Probability)
Posted on 2014-12-01 (1 Comments)
Solution computer assisted solution by Charlie (2014-12-01 16:23:18)
Difficulty: 3 of 5Under What not? (in General)
Posted on 2014-12-01 (4 Comments)
Some Thoughts re(2): My solution (spoiler?) by Charlie (2014-12-02 22:06:55)
Solution My solution (spoiler?) by Charlie (2014-12-01 08:41:05)
Difficulty: 2 of 5Under Seven Age Settlement (in Logic)
Posted on 2014-11-24 (4 Comments)
Solution No Subject by Charlie (2014-11-24 14:59:19)
Difficulty: 3 of 5Under To a fifth of the wind, that pierces us most (in Famous Riddles)
Posted on 2014-11-21 (1 Comments)
Hints/Tips Hints by Charlie (2014-11-21 12:24:00)
Difficulty: 3 of 5Under A symmetric relation (in Just Math)
Posted on 2014-11-19 (5 Comments)
re: The easy solution by Charlie (2014-11-19 08:42:49)
Some Thoughts The easy solution by Charlie (2014-11-19 08:40:36)
Difficulty: 3 of 5Under Real Resolution II (in Just Math)
Posted on 2014-11-18 (1 Comments)
Solution solution by Charlie (2014-11-18 14:36:03)
Difficulty: 3 of 5Under Missions impossible (in Just Math)
Posted on 2014-11-17 (3 Comments)
Solution solution by Charlie (2014-11-17 19:16:26)
Difficulty: 3 of 5Under Well said (in General)
Posted on 2014-11-17 (2 Comments)
re: Decrypting the quote (spoiler) by Charlie (2014-11-17 12:48:13)
Difficulty: 3 of 5Under Inconsiderable Integer Illation (in Just Math)
Posted on 2014-11-16 (10 Comments)
re: answer only by Charlie (2014-11-16 14:55:12)
Solution Actual answer -- calculator solution by Charlie (2014-11-16 14:50:58)
Difficulty: 3 of 5Under An aSCending SCale (in Word Problems)
Posted on 2014-11-14 (7 Comments)
re(2): some examples from the computer by Charlie (2014-11-15 07:39:18)
Some Thoughts some examples from the computer by Charlie (2014-11-14 14:21:21)
Difficulty: 3 of 5Under Deux Digit Determination (in Just Math)
Posted on 2014-11-13 (4 Comments)
re: Full expansion, but unproven result by Charlie (2014-11-13 14:29:50)
Solution computer solution by Charlie (2014-11-13 14:24:33)
Difficulty: 3 of 5Under Survival Surmise (in Logic)
Posted on 2014-11-12 (2 Comments)
Solution solution by Charlie (2014-11-12 15:27:36)
Difficulty: 2 of 5Under Hours of Operation (in Numbers)
Posted on 2014-11-12 (8 Comments)
Some Thoughts Longest for 12-hour clock: computer solution by Charlie (2014-11-13 08:15:01)
Some Thoughts re: Longest duration, 24 hour clock (spoiler) by Charlie (2014-11-13 08:07:14)
Difficulty: 3 of 5Under Austria or Italy ? (in Just Math)
Posted on 2014-11-11 (1 Comments)
Solution computer solution by Charlie (2014-11-11 15:44:30)
Difficulty: 3 of 5Under Composite Sum Satisfaction (in Just Math)
Posted on 2014-11-11 (4 Comments)
Solution computer solution by Charlie (2014-11-11 10:34:13)
Difficulty: 3 of 5Under Arrival Appraisal (in Science)
Posted on 2014-11-07 (2 Comments)
Solution different solution by Charlie (2014-11-07 20:45:06)
Difficulty: 2 of 5Under Philately Ponder (in Logic)
Posted on 2014-11-07 (3 Comments)
Solution solution by Charlie (2014-11-07 10:11:36)
Difficulty: 3 of 5Under Supreme Red Sox Surmise (in Probability)
Posted on 2014-11-06 (3 Comments)
Solution computer solution by Charlie (2014-11-06 11:05:58)
Difficulty: 3 of 5Under Box Volume Baffle (in Shapes)
Posted on 2014-11-05 (5 Comments)
Solution re(2): No Subject by Charlie (2014-11-06 14:43:23)
Some Thoughts No Subject by Charlie (2014-11-06 08:19:07)
Difficulty: 3 of 5Under RMS Rigor (in Just Math)
Posted on 2014-11-04 (4 Comments)
Some Thoughts computer check of all a from 1 to a million (spoiler) by Charlie (2014-11-04 20:32:00)
Difficulty: 3 of 5Under Square Choice Conclusion (in Probability)
Posted on 2014-11-04 (2 Comments)
Solution solution (spoiler) by Charlie (2014-11-04 08:33:07)
Difficulty: 3 of 5Under Win some, lose some (in Logic)
Posted on 2014-11-03 (1 Comments)
Some Thoughts discussion by Charlie (2014-11-03 15:57:12)
Difficulty: 2 of 5Under Fridays (in Numbers)
Posted on 2014-11-03 (1 Comments)
Solution computer solution by Charlie (2014-11-03 10:54:22)
Difficulty: 3 of 5Under Quadrilateral Quandary (in Shapes)
Posted on 2014-11-02 (1 Comments)
Some Thoughts Geometers' Sketchpad approximations by Charlie (2014-11-02 22:26:15)
Difficulty: 3 of 5Under Chairs galore (in Just Math)
Posted on 2014-10-31 (4 Comments)
Solution solution and discussion by Charlie (2014-10-31 10:19:44)
Difficulty: 3 of 5Under Identical Digit Baffle II (in Just Math)
Posted on 2014-10-30 (2 Comments)
Solution solution and also those in the middle by Charlie (2014-10-30 14:35:46)
Difficulty: 1 of 5Under Reply to this (in Just Math)
Posted on 2014-10-30 (8 Comments)
Solution solution by Charlie (2014-10-30 12:06:57)
Difficulty: 5 of 5Under Random^Random (in Probability)
Posted on 2014-10-29 (9 Comments)
Solution re: table of numeric integration by Charlie (2014-10-30 08:47:54)
re(2): table of numeric integration by Charlie (2014-10-30 08:34:08)
Solution table of numeric integration by Charlie (2014-10-29 15:41:37)
Some Thoughts re: towards an analytic solution - numeric integration by Charlie (2014-10-29 15:32:44)
Hints/Tips towards an analytic solution by Charlie (2014-10-29 14:35:18)
Some Thoughts numerical simulation by Charlie (2014-10-29 13:54:25)
Difficulty: 3 of 5Under Analyzing change (in Just Math)
Posted on 2014-10-28 (4 Comments)
Solution computer solution by Charlie (2014-10-28 12:22:14)
Difficulty: 3 of 5Under Hat #9 (in Word Problems)
Posted on 2014-10-27 (2 Comments)
Solution uncommented computer output by Charlie (2014-10-27 19:15:56)
Difficulty: 3 of 5Under Word Containment Contemplation (in Word Problems)
Posted on 2014-10-27 (3 Comments)
re: No Subject by Charlie (2014-10-27 14:21:23)
Difficulty: 3 of 5Under Uncommonly Common (in Riddles)
Posted on 2014-10-25 (4 Comments)
Some Thoughts one possibility by Charlie (2014-10-26 08:34:42)
Difficulty: 2 of 5Under Performance Probe (in Logic)
Posted on 2014-10-24 (2 Comments)
Solution computer solution by Charlie (2014-10-24 19:28:50)
Difficulty: 3 of 5Under Curious concatenations (in Numbers)
Posted on 2014-10-23 (1 Comments)
computer solutions by Charlie (2014-10-23 16:07:43)
Difficulty: 3 of 5Under Extending tic-tac-toe (in Just Math)
Posted on 2014-10-23 (6 Comments)
re: General Solution by Charlie (2014-10-23 10:25:31)
Solution computer solutions by Charlie (2014-10-23 10:21:55)
Some Thoughts 10-min p&p based on a misinterpretation -- not a solution by Charlie (2014-10-23 09:38:17)
Difficulty: 4 of 5Under Beaujolais Nouveau Day (in Probability)
Posted on 2014-10-22 (7 Comments)
Solution computer solution by Charlie (2014-10-22 16:12:59)
Difficulty: 1 of 5Under One by two (in Numbers)
Posted on 2014-10-22 (6 Comments)
Solution re: 19 solutions by Charlie (2014-10-22 11:17:13)
Difficulty: 3 of 5Under Distinct Decimal Digits (in Numbers)
Posted on 2014-10-21 (1 Comments)
Solution computer solutions by Charlie (2014-10-21 15:30:43)
Difficulty: 3 of 5Under Farmer Giles (in Just Math)
Posted on 2014-10-21 (4 Comments)
Some Thoughts re(2): solutions by Charlie (2014-10-22 07:45:10)
Solution solutions by Charlie (2014-10-21 10:36:47)
Difficulty: 3 of 5Under Cuisine Conclusion II (in Word Problems)
Posted on 2014-10-20 (5 Comments)
Solution computer-aided method by Charlie (2014-10-20 15:49:41)
Difficulty: 3 of 5Under Half odd, half even (in Numbers)
Posted on 2014-10-16 (3 Comments)
re: Answer by Charlie (2014-10-16 15:23:55)
Solution computer solution by Charlie (2014-10-16 15:07:00)
Difficulty: 3 of 5Under Distinct Values Validation (in Just Math)
Posted on 2014-10-16 (8 Comments)
Some Thoughts re: Alternative formulation, x+y+z <= 94 by Charlie (2014-10-16 14:59:55)
Some Thoughts Alternative formulation, while it had been in the queue by Charlie (2014-10-16 10:52:31)
Solution solution by Charlie (2014-10-16 10:39:49)
Difficulty: 3 of 5Under Reverse Role (in Just Math)
Posted on 2014-10-15 (4 Comments)
re(2): More Bases (spoiler) by Charlie (2014-10-15 14:37:39)
Difficulty: 3 of 5Under My products (in General)
Posted on 2014-10-15 (3 Comments)
Solution computer solution (spoiler) by Charlie (2014-10-15 10:28:44)
Difficulty: 3 of 5Under Ternary Sum Travail (in Probability)
Posted on 2014-10-14 (2 Comments)
Solution computer solution by Charlie (2014-10-14 14:55:57)
Difficulty: 3 of 5Under Dozen Word Amalgamation (in Word Problems)
Posted on 2014-10-13 (2 Comments)
Solution Learned a new word (spoiler) by Charlie (2014-10-13 15:21:06)
Difficulty: 2 of 5Under A versatile number (in Numbers)
Posted on 2014-10-13 (6 Comments)
manual solution to bonus is wrong by Charlie (2014-10-13 14:27:46)
Some Thoughts Bonus only--not the actual puzzle. by Charlie (2014-10-13 08:57:02)
Difficulty: 3 of 5Under Greatest GCD (in Sequences)
Posted on 2014-10-12 (5 Comments)
Some Thoughts computer exploration by Charlie (2014-10-12 14:17:06)
Difficulty: 4 of 5Under Cryptajoke II (in Cryptography)
Posted on 2014-10-11 (3 Comments)
Some Thoughts thoughts by Charlie (2014-10-12 10:39:32)
Difficulty: 3 of 5Under Arithmetic and Geometric Addle (in Sequences)
Posted on 2014-10-10 (3 Comments)
Solution computer solution by Charlie (2014-10-10 14:55:13)
Difficulty: 2 of 5Under Optimal location (in Just Math)
Posted on 2014-10-10 (2 Comments)
Solution solution (spoiler) by Charlie (2014-10-10 10:06:24)
Difficulty: 3 of 5Under A happy trio (in Probability)
Posted on 2014-10-09 (3 Comments)
Solution A better approximation by Charlie (2014-10-09 13:48:49)
Difficulty: 3 of 5Under Draw and go (in Probability)
Posted on 2014-10-08 (14 Comments)
re(3): short amendment att Charlie by Charlie (2014-10-13 15:25:25)
re: short amendment by Charlie (2014-10-11 22:32:53)
re(4): Solution or partial solution ... clarification by Charlie (2014-10-10 07:56:31)
Some Thoughts re(2): Solution or partial solution ... clarification by Charlie (2014-10-09 09:56:20)
Difficulty: 3 of 5Under Counting Crossings (in Geometry)
Posted on 2014-10-08 (7 Comments)
Some Thoughts wording by Charlie (2014-10-09 07:51:57)
Solution solution by Charlie (2014-10-08 13:12:45)
Difficulty: 3 of 5Under Zeroless or not? (in Probability)
Posted on 2014-10-07 (1 Comments)
Solution computer exploration by Charlie (2014-10-07 10:35:23)
Difficulty: 3 of 5Under Winning Ticket Tickle (in Probability)
Posted on 2014-10-06 (6 Comments)
re(2): computer aided solution by Charlie (2014-10-06 14:28:04)
Solution re: computer aided solution -- whoops!; 50 is not under 46 by Charlie (2014-10-06 14:23:44)
Some Thoughts computer aided solution by Charlie (2014-10-06 14:19:08)
Difficulty: 3 of 5Under Inverse Power Pact (in Just Math)
Posted on 2014-10-02 (2 Comments)
Solution The computer solution by Charlie (2014-10-02 10:47:53)
Difficulty: 4 of 5Under Why and when (in General)
Posted on 2014-10-01 (1 Comments)
Solution computer aided solution by Charlie (2014-10-01 15:51:47)
Difficulty: 2 of 5Under Get them up (in Just Math)
Posted on 2014-10-01 (5 Comments)
re(2): Unsatisfying computer proof by Charlie (2014-10-02 10:53:50)
Solution Unsatisfying computer proof by Charlie (2014-10-01 11:21:11)
Difficulty: 3 of 5Under Consecutive Conclusion (in Just Math)
Posted on 2014-09-30 (9 Comments)
re(2): two computer algorithm solutions by Charlie (2014-10-01 07:41:24)
Solution two computer algorithm solutions by Charlie (2014-09-30 18:40:42)
Difficulty: 3 of 5Under Square Result Rumination (in Just Math)
Posted on 2014-09-28 (6 Comments)
other types of cases by Charlie (2014-09-28 21:57:30)
Solution Technical solution--but a larger question remains. by Charlie (2014-09-28 09:04:20)
Difficulty: 3 of 5Under Simultaneous Satisfaction (in Just Math)
Posted on 2014-09-27 (2 Comments)
Solution computer solution and outline of a possible analytic method by Charlie (2014-09-27 15:17:56)
Difficulty: 3 of 5Under Cubic Minimum (in Just Math)
Posted on 2014-09-26 (7 Comments)
Solution computer solution by Charlie (2014-09-26 13:50:49)
re: ANSWER by Charlie (2014-09-26 13:47:41)
Difficulty: 2 of 5Under Only one basic solution II (in General)
Posted on 2014-09-26 (1 Comments)
Solution computer assisted solution by Charlie (2014-09-26 10:30:55)
Difficulty: 3 of 5Under Moving target (in Shapes)
Posted on 2014-09-25 (2 Comments)
Solution solution by Charlie (2014-09-25 19:13:59)
Difficulty: 3 of 5Under Mary, Mary, Quite Orderly (in Just Math)
Posted on 2014-09-24 (6 Comments)
Solution Part (ii) at last (?) by Charlie (2014-09-26 14:44:57)
Some Thoughts re(4): solution -- second thoughts on correction by Charlie (2014-09-25 09:53:12)
Some Thoughts re(3): solution -- corrected part (ii) it is hoped by Charlie (2014-09-25 09:42:30)
re(2): solution by Charlie (2014-09-25 07:48:06)
Solution solution by Charlie (2014-09-24 16:00:59)
Difficulty: 3 of 5Under Rectangle Color Rigor (in Just Math)
Posted on 2014-09-23 (4 Comments)
Solution a diagram by Charlie (2014-09-23 12:37:28)
Difficulty: 3 of 5Under Cinq Digit Choice (in Probability)
Posted on 2014-09-22 (1 Comments)
Solution computer solution (spoiler) by Charlie (2014-09-22 16:29:18)
Difficulty: 2 of 5Under Max and Min (in Just Math)
Posted on 2014-09-22 (3 Comments)
Solution computer solution by Charlie (2014-09-22 12:22:25)
Difficulty: 3 of 5Under Nine Marbles (in Weights and Scales)
Posted on 2014-09-20 (6 Comments)
Solution re: Computer Program Solution by Charlie (2020-11-09 10:45:38)
Difficulty: 3 of 5Under Cuisine Conclusion (in Cryptography)
Posted on 2014-09-18 (1 Comments)
Solution solution (spoiler): middle four enough to answer the question by Charlie (2014-09-18 10:34:24)
Difficulty: 3 of 5Under Simultaneous Base Baffle (in Just Math)
Posted on 2014-09-17 (6 Comments)
Solution computer solution -- the good the bad and the ugly by Charlie (2014-09-17 15:42:06)
re: solution by Charlie (2014-09-17 15:36:48)
Difficulty: 3 of 5Under Adding to rolls (in Probability)
Posted on 2014-09-15 (1 Comments)
Solution solution by Charlie (2014-09-15 18:05:27)
Difficulty: 3 of 5Under n-dimensional spheres (in Just Math)
Posted on 2014-09-15 (2 Comments)
Some Thoughts The sequence, if my trig is right by Charlie (2014-09-15 08:26:49)
Difficulty: 4 of 5Under Inherited Veracity II (in Liars and Knights)
Posted on 2014-09-12 (2 Comments)
re: computer solution by Charlie (2014-09-14 07:47:05)
Solution computer solution by Charlie (2014-09-12 13:24:44)
Difficulty: 3 of 5Under Roy G Biv (in Probability)
Posted on 2014-09-11 (1 Comments)
Solution computer solution by Charlie (2014-09-11 16:36:33)
Difficulty: 3 of 5Under Digital Time (in General)
Posted on 2014-09-10 (1 Comments)
Solution computer solution and analysis by Charlie (2014-09-10 12:07:42)
Difficulty: 3 of 5Under Rooted to the Floor II (in Just Math)
Posted on 2014-09-08 (3 Comments)
Solution computer solution by Charlie (2014-09-08 17:28:37)
Difficulty: 2 of 5Under Identical Digit Baffle (in Just Math)
Posted on 2014-09-08 (2 Comments)
Solution computer solution by Charlie (2014-09-08 11:07:11)
Difficulty: 3 of 5Under 2 pandigital equations (in Numbers)
Posted on 2014-09-05 (4 Comments)
Solution computer solution by Charlie (2014-09-05 18:14:59)
Difficulty: 3 of 5Under Distinct Delivery Deduction (in Just Math)
Posted on 2014-09-04 (7 Comments)
Solution a computer solution by Charlie (2014-09-04 17:33:37)
Difficulty: 2 of 5Under 2015 digits (in Just Math)
Posted on 2014-09-04 (2 Comments)
Solution solution by Charlie (2014-09-04 11:22:35)
Difficulty: 3 of 5Under Sparse Sine Settlement (in Just Math)
Posted on 2014-09-03 (2 Comments)
Solution computer-aided solution by Charlie (2014-09-03 18:03:11)
Difficulty: 2 of 5Under Decimal Digits (in General)
Posted on 2014-09-02 (5 Comments)
Some Thoughts thoughts on (a) by Charlie (2014-09-02 14:10:31)
Difficulty: 1 of 5Under World War I sword (in Riddles)
Posted on 2014-09-02 (3 Comments)
Solution spoiler by Charlie (2014-09-02 14:02:29)
Difficulty: 3 of 5Under Cuboid Diagonal Conclusion (in Shapes)
Posted on 2014-09-01 (4 Comments)
Solution re: solution by Charlie (2014-09-01 21:54:16)
Some Thoughts solution by Charlie (2014-09-01 17:55:48)
Difficulty: 2 of 5Under Hi there, Pascal (in Numbers)
Posted on 2014-09-01 (2 Comments)
Solution computer solution by Charlie (2014-09-01 12:36:58)
Difficulty: 3 of 5Under Test #5 (in Word Problems)
Posted on 2014-08-31 (1 Comments)
Solution computer findings by Charlie (2014-08-31 13:13:28)
Difficulty: 3 of 5Under Triangular Triangulation (in Just Math)
Posted on 2014-08-30 (4 Comments)
Some Thoughts They do seem to keep on coming -- no proof either way by Charlie (2014-08-30 14:46:28)
Difficulty: 3 of 5Under Playing With Marbles II (in Probability)
Posted on 2014-08-29 (2 Comments)
simulation verification by Charlie (2014-08-29 12:16:17)
Solution solution by Charlie (2014-08-29 11:39:58)
Difficulty: 2 of 5Under Segment Section Settlement (in Probability)
Posted on 2014-08-28 (3 Comments)
Solution solution and verification by Charlie (2014-08-28 12:44:27)
Difficulty: 3 of 5Under Tetrahedra Trial (in Shapes)
Posted on 2014-08-27 (1 Comments)
Solution solution by Charlie (2014-08-27 19:39:03)
Difficulty: 3 of 5Under Concavity (in Calculus)
Posted on 2014-08-26 (2 Comments)
Solution observation by Charlie (2014-08-26 17:19:21)
Difficulty: 2 of 5Under One up (in Probability)
Posted on 2014-08-22 (1 Comments)
Solution With computer assistance by Charlie (2014-08-22 12:33:30)
Difficulty: 3 of 5Under Three tasks (in Just Math)
Posted on 2014-08-21 (3 Comments)
Solution computer solutions by Charlie (2014-08-21 16:53:45)
Difficulty: 2 of 5Under Grandma's age (in Just Math)
Posted on 2014-08-20 (8 Comments)
Some Thoughts I must be missing something by Charlie (2014-08-20 16:20:37)
Difficulty: 2 of 5Under Square Cut (in Shapes)
Posted on 2014-08-20 (2 Comments)
Solution exploded by Charlie (2014-08-20 12:58:18)
Difficulty: 3 of 5Under Pandigital Ponder II (in Just Math)
Posted on 2014-08-19 (3 Comments)
Solution computer solution by Charlie (2014-08-19 18:18:00)
Difficulty: 3 of 5Under Test #4 (in General)
Posted on 2014-08-19 (1 Comments)
Solution computer solution by Charlie (2014-08-19 12:20:04)
Difficulty: 3 of 5Under Quaint Quadruplets (in Just Math)
Posted on 2014-08-18 (3 Comments)
Some Thoughts re: software solution--similar puzzle solution by Charlie (2014-08-19 10:03:12)
Solution software solution by Charlie (2014-08-18 20:58:28)
Difficulty: 2 of 5Under Crossnumber IV (in General)
Posted on 2014-08-18 (3 Comments)
Some Thoughts attempt without leading zeroes by Charlie (2014-08-18 12:24:28)
Difficulty: 3 of 5Under Three subsets (in Just Math)
Posted on 2014-08-15 (14 Comments)
Solution final (?) revision by Charlie (2014-08-16 10:41:22)
re(2): solution -- now for real?...count again... by Charlie (2014-08-16 00:09:04)
another try by Charlie (2014-08-16 00:07:16)
solution -- now for real? by Charlie (2014-08-15 17:07:08)
re(2): computer solution by Charlie (2014-08-15 16:32:20)
computer solution by Charlie (2014-08-15 13:06:09)
Difficulty: 3 of 5Under Cutting corners. (in Shapes)
Posted on 2014-08-14 (6 Comments)
Solution re(2): what is wanted? by Charlie (2014-08-15 10:07:19)
Some Thoughts re: what is wanted? by Charlie (2014-08-14 16:41:17)
Some Thoughts what is wanted? by Charlie (2014-08-14 16:34:12)
Difficulty: 3 of 5Under Pandigital Ponder (in Just Math)
Posted on 2014-08-13 (1 Comments)
Solution computer solutions by Charlie (2014-08-13 15:50:53)
Difficulty: 3 of 5Under Some Triangles Sum 2014 (in Just Math)
Posted on 2014-08-12 (5 Comments)
Question re: Possible Solution by Charlie (2014-08-12 17:24:03)
Solution computer solution by Charlie (2014-08-12 17:10:24)
Difficulty: 3 of 5Under Octahedron Vertex Ponder (in Probability)
Posted on 2014-08-12 (1 Comments)
Solution computer solution by Charlie (2014-08-12 11:41:39)
Difficulty: 3 of 5Under Fraction Sum Satisfaction (in Just Math)
Posted on 2014-08-09 (4 Comments)
Solution computer solutions by Charlie (2014-08-09 13:16:49)
re: 5 answers by Charlie (2014-08-09 13:14:38)
Difficulty: 3 of 5Under Guessing ages (in Tricks)
Posted on 2014-08-08 (4 Comments)
Solution solution by Charlie (2014-08-08 13:14:29)
Difficulty: 3 of 5Under Pair Ponder (in Probability)
Posted on 2014-08-07 (2 Comments)
Some Thoughts simulation verification by Charlie (2014-08-07 13:29:43)
Solution solution by Charlie (2014-08-07 12:22:36)
Difficulty: 2 of 5Under Find a Frenzy Fibo (in Numbers)
Posted on 2014-08-06 (2 Comments)
Some Thoughts For a similar problem by Charlie (2014-08-06 11:22:46)
Difficulty: 3 of 5Under Done? No need? ...UNDO! (in Word Problems)
Posted on 2014-08-05 (4 Comments)
Solution computer solution -- no definitions by Charlie (2014-08-05 13:29:27)
Difficulty: 3 of 5Under Test #2 (in General)
Posted on 2014-08-04 (1 Comments)
Solution computer solution by Charlie (2014-08-04 17:43:24)
Difficulty: 3 of 5Under Palindrome Ponder (in Just Math)
Posted on 2014-08-04 (1 Comments)
Solution solution by Charlie (2014-08-04 13:09:37)
Difficulty: 3 of 5Under Sixes and Sevens (in Just Math)
Posted on 2014-08-02 (4 Comments)
Solution computer solution by Charlie (2014-08-02 14:26:11)
Difficulty: 3 of 5Under Log Divisor Sum (in Just Math)
Posted on 2014-08-01 (2 Comments)
Solution computer solution by Charlie (2014-08-01 12:36:02)
Difficulty: 3 of 5Under Easy count (in Just Math)
Posted on 2014-07-29 (5 Comments)
re: Solution by Charlie (2014-07-30 09:57:26)
Solution computer assisted solution by Charlie (2014-07-29 14:38:40)
Difficulty: 3 of 5Under Test #1 (in Numbers)
Posted on 2014-07-29 (2 Comments)
Solution computer assisted solution by Charlie (2014-07-29 11:55:29)
Difficulty: 2 of 5Under Triangle Texture (in Shapes)
Posted on 2014-07-28 (2 Comments)
re: My guess by Charlie (2014-07-28 17:33:02)
Difficulty: 3 of 5Under One of a kind (in Just Math)
Posted on 2014-07-27 (3 Comments)
re(2): contradictions? Yes, Sir by Charlie (2014-07-28 09:56:37)
Solution contradictions? by Charlie (2014-07-27 19:10:51)
Difficulty: 3 of 5Under The decisive straw (in Probability)
Posted on 2014-07-25 (6 Comments)
Some Thoughts computer exploration--heuristic approximation by Charlie (2014-07-25 14:06:27)
Difficulty: 3 of 5Under Testy Triplet Treat II (in Just Math)
Posted on 2014-07-25 (4 Comments)
Solution solution by Charlie (2014-07-25 12:41:16)
Difficulty: 3 of 5Under Choose-Product Conclusion (in Just Math)
Posted on 2014-07-23 (1 Comments)
Some Thoughts computer exploration (possible spoiler) by Charlie (2014-07-23 15:32:03)
Difficulty: 3 of 5Under Last digit counts (in Numbers)
Posted on 2014-07-23 (1 Comments)
Solution computer solution by Charlie (2014-07-23 14:30:25)
Difficulty: 3 of 5Under Reverse Rigor II (in Just Math)
Posted on 2014-07-22 (4 Comments)
Solution re(2): possible computer solution by Charlie (2014-07-22 13:43:14)
Some Thoughts possible computer solution by Charlie (2014-07-22 11:58:31)
Difficulty: 3 of 5Under Quiz Quandary III (in Logic)
Posted on 2014-07-15 (8 Comments)
Solution ignore previous post: solution correced by Charlie (2014-07-17 13:14:29)
Some Thoughts computer solution by Charlie (2014-07-17 12:33:20)
Difficulty: 3 of 5Under Sum Power Digit Determination (in Just Math)
Posted on 2014-07-12 (4 Comments)
Solution computer solution by Charlie (2014-07-12 12:30:34)
Difficulty: 3 of 5Under A periodical fraction (in Numbers)
Posted on 2014-07-11 (3 Comments)
Solution computer solution by Charlie (2014-07-11 13:38:40)
Difficulty: 3 of 5Under Cinq Confusion (in Shapes)
Posted on 2014-07-10 (3 Comments)
Solution computer solution by Charlie (2014-07-10 11:55:08)
Difficulty: 3 of 5Under 3 features (in Numbers)
Posted on 2014-07-08 (1 Comments)
Solution computer solution by Charlie (2014-07-08 20:32:07)
Difficulty: 3 of 5Under Mean Muse II (in Just Math)
Posted on 2014-07-06 (1 Comments)
Solution computer solution by Charlie (2014-07-07 13:27:19)
Difficulty: 3 of 5Under Go on, it is easy (in General)
Posted on 2014-07-05 (1 Comments)
Solution solution by Charlie (2014-07-05 14:37:00)
Difficulty: 3 of 5Under An equation (in Just Math)
Posted on 2014-07-03 (5 Comments)
Some Thoughts computer exploration by Charlie (2014-07-04 11:51:38)
Difficulty: 2 of 5Under Only one basic solution (in Just Math)
Posted on 2014-07-02 (2 Comments)
Solution computer solutions by Charlie (2014-07-02 12:33:17)
Difficulty: 2 of 5Under Arctan Appraisal (in Just Math)
Posted on 2014-07-01 (2 Comments)
Some Thoughts computer timing by Charlie (2014-07-01 13:06:54)
Difficulty: 3 of 5Under End and Begin II (in Word Problems)
Posted on 2014-06-30 (6 Comments)
Some Thoughts A start by Charlie (2014-06-30 11:01:27)
Difficulty: 3 of 5Under Some dinner! (in Cryptography)
Posted on 2014-06-29 (2 Comments)
To avoid food poisoning... by Charlie (2014-06-29 12:50:40)
Difficulty: 3 of 5Under Six Term Settlement (in Just Math)
Posted on 2014-06-26 (3 Comments)
Solution computer solutions by Charlie (2014-06-26 15:25:55)
Difficulty: 4 of 5Under scitemahpla II (in Word Problems)
Posted on 2014-06-25 (5 Comments)
Solution re: solution by Charlie (2014-06-26 12:56:58)
Solution solution by Charlie (2014-06-25 12:56:11)
Difficulty: 3 of 5Under An enchanted coin (in Probability)
Posted on 2014-06-24 (3 Comments)
Solution possible solution by Charlie (2014-06-24 15:23:52)
Difficulty: 3 of 5Under Smarandache Settlement (in Just Math)
Posted on 2014-06-24 (2 Comments)
Solution computer aided solution by Charlie (2014-06-24 12:58:06)
Difficulty: 3 of 5Under 2+2=4 is true (in Just Math)
Posted on 2014-06-22 (2 Comments)
Solution computer solutions by Charlie (2014-06-22 13:07:40)
Difficulty: 3 of 5Under Minimum Value Muse (in Just Math)
Posted on 2014-06-20 (3 Comments)
Solution computer solution by Charlie (2014-06-20 12:51:59)
Difficulty: 2 of 5Under Diagram Dilemma (in Just Math)
Posted on 2014-06-19 (1 Comments)
Solution solution by Charlie (2014-06-19 15:26:15)
Difficulty: 3 of 5Under A tall tower (in Geometry)
Posted on 2014-06-18 (6 Comments)
Question re: Solution - Spoiler by Charlie (2014-06-19 10:03:56)
Solution solution by Charlie (2014-06-19 09:57:57)
Difficulty: 3 of 5Under Arithmetic Grid II (in Just Math)
Posted on 2014-06-12 (2 Comments)
Solution The program method by Charlie (2014-06-12 23:44:27)
Difficulty: 3 of 5Under Three Product Tease (in Just Math)
Posted on 2014-06-12 (3 Comments)
Solution numbers without proof of completeness by Charlie (2014-06-12 11:37:50)
Difficulty: 3 of 5Under Ninety-Nine Nuance (in Just Math)
Posted on 2014-06-11 (3 Comments)
My path to the wrong answer--not a solution by Charlie (2014-06-11 14:55:07)
Difficulty: 3 of 5Under Integer Illation (in Logic)
Posted on 2014-06-10 (4 Comments)
Solution computer solution by Charlie (2014-06-10 15:18:45)
Difficulty: 3 of 5Under The mad hatter (in Word Problems)
Posted on 2014-06-09 (5 Comments)
Solution 8-letter words by Charlie (2014-06-09 22:09:03)
Solution re: 7-letter words from program (spoilers) -- continued by Charlie (2014-06-09 22:05:38)
Solution 7-letter words from program (spoilers) by Charlie (2014-06-09 22:04:21)
computer program by Charlie (2014-06-09 22:02:42)
Difficulty: 4 of 5Under Yankee dollar (in Just Math)
Posted on 2014-06-06 (9 Comments)
Solution computer aided solution by Charlie (2014-06-06 16:54:21)
Difficulty: 3 of 5Under Four Digit Trial (in Just Math)
Posted on 2014-06-05 (3 Comments)
Solution computer solution by Charlie (2014-06-05 16:41:56)
Difficulty: 2 of 5Under 4 ways (in Sequences)
Posted on 2014-06-04 (6 Comments)
Solution computer solution by Charlie (2014-06-04 18:02:26)
Difficulty: 2 of 5Under Elementary is easy (in Sequences)
Posted on 2014-06-04 (5 Comments)
Solution answers (spoilers) by Charlie (2014-06-04 13:45:03)
Difficulty: 3 of 5Under Sum Settlement (in Just Math)
Posted on 2014-06-03 (4 Comments)
Solution re: Possible solution -- agreed by Charlie (2014-06-03 15:36:15)
Difficulty: 2 of 5Under Fuel Feat (in Just Math)
Posted on 2014-06-03 (4 Comments)
re(3): Solution by Charlie (2014-06-03 13:19:40)
Solution re: Solution by Charlie (2014-06-03 12:22:29)
Difficulty: 3 of 5Under Arithmetic Grid (in Just Math)
Posted on 2014-05-30 (1 Comments)
Solution computer solution by Charlie (2014-05-30 12:01:48)
Difficulty: 2 of 5Under The pandigital student (in Cryptography)
Posted on 2014-05-29 (3 Comments)
re: it takes two to 504go.. by Charlie (2014-06-02 10:26:38)
If the 8 and the 4 were the same... by Charlie (2014-05-29 11:28:13)
Difficulty: 3 of 5Under Inverse Square Sum (in Just Math)
Posted on 2014-05-28 (5 Comments)
re(3): Do i err ?? by Charlie (2014-05-29 09:35:11)
re: Do i err ?? by Charlie (2014-05-28 13:34:18)
Difficulty: 4 of 5Under Money Division Muse (in Just Math)
Posted on 2014-05-27 (4 Comments)
re: So close yet so far? by Charlie (2014-05-27 23:36:45)
Solution computer solution by Charlie (2014-05-27 15:57:58)
Difficulty: 3 of 5Under Representation Initiation (in Just Math)
Posted on 2014-05-26 (3 Comments)
re: Simpler computer solution by Charlie (2014-05-27 13:06:02)
Solution computer solution by Charlie (2014-05-26 16:47:35)
Difficulty: 3 of 5Under Floor Limit (in Calculus)
Posted on 2014-05-26 (1 Comments)
Solution solution by Charlie (2014-05-26 13:21:08)
Difficulty: 3 of 5Under Eight Embodiment (in Just Math)
Posted on 2014-05-25 (6 Comments)
Solution computer solution by Charlie (2014-05-25 14:15:40)
Difficulty: 2 of 5Under Year Yearn (in General)
Posted on 2014-05-23 (6 Comments)
Solution All except (v) by Charlie (2014-05-23 10:39:46)
Difficulty: 3 of 5Under Harmonic Sequence Settlement (in Just Math)
Posted on 2014-05-22 (3 Comments)
Solution solution with computer code and derivation by Charlie (2014-05-22 16:34:42)
Difficulty: 4 of 5Under Why Haydn ? (in Numbers)
Posted on 2014-05-21 (2 Comments)
Solution computer solution by Charlie (2014-05-21 16:19:59)
Difficulty: 3 of 5Under Array Assignment (in Just Math)
Posted on 2014-05-20 (2 Comments)
Solution Taking into consideration (ii) by Charlie (2014-05-20 15:46:25)
Difficulty: 3 of 5Under Five Friends (in Logic)
Posted on 2014-05-19 (2 Comments)
Solution solution by Charlie (2014-05-19 11:03:00)
Difficulty: 3 of 5Under Side Length Settlement (in Shapes)
Posted on 2014-05-18 (3 Comments)
Solution numerically from Geometers' Sketchpad by Charlie (2014-05-18 23:54:26)
Difficulty: 3 of 5Under Guessing Game (in Numbers)
Posted on 2014-05-16 (19 Comments)
Some Thoughts rational play for the highest integral K allowing play in part b by Charlie (2014-05-18 13:16:04)
Solution Repaired VB program agrees with Steve's answer to part b by Charlie (2014-05-18 12:06:44)
re(3): different part b solution (VB program) by Charlie (2014-05-18 01:13:25)
re: different part b solution (VB program) by Charlie (2014-05-17 16:43:29)
Solution different part b solution (VB program) by Charlie (2014-05-17 16:15:35)
Solution part a solution by Charlie (2014-05-17 01:35:39)
Difficulty: 2 of 5Under The highest prime (in Numbers)
Posted on 2014-05-16 (8 Comments)
Solution my computer solution -- concatenation assumed by Charlie (2014-05-16 12:49:52)
Difficulty: 3 of 5Under Expected of each (in Probability)
Posted on 2014-05-15 (3 Comments)
Solution computer simulation by Charlie (2014-05-15 16:35:46)
Difficulty: 3 of 5Under Attack Assay (in Probability)
Posted on 2014-05-14 (3 Comments)
Solution solution by Charlie (2014-05-14 12:56:47)
Difficulty: 3 of 5Under Quiz Score Settlement (in Liars and Knights)
Posted on 2014-05-13 (5 Comments)
Some Thoughts The way I look at it by Charlie (2014-05-13 11:15:12)
Difficulty: 3 of 5Under Repdigit Rigor (in Just Math)
Posted on 2014-05-11 (2 Comments)
Some Thoughts computer exploration by Charlie (2014-05-11 16:07:53)
Difficulty: 3 of 5Under Pandigital concatenations (in Numbers)
Posted on 2014-05-10 (1 Comments)
Solution computer solutions by Charlie (2014-05-10 15:55:51)
Difficulty: 3 of 5Under Not in every dictionary (in Cryptography)
Posted on 2014-05-09 (3 Comments)
one for Wikipedia by Charlie (2014-05-09 15:33:01)
Difficulty: 3 of 5Under The Ten Statements II (in Logic)
Posted on 2014-05-08 (7 Comments)
re(2): Solution by Charlie (2014-05-10 10:15:00)
Solution re(2): Solution by Charlie (2014-05-09 00:03:11)
Difficulty: 3 of 5Under Baby Blue (in Probability)
Posted on 2014-05-08 (11 Comments)
re: ....hesitating... by Charlie (2014-05-09 09:44:05)
re: answer by Charlie (2014-05-08 10:57:43)
Solution solution by Charlie (2014-05-08 10:56:15)
Difficulty: 2 of 5Under Big spenders (in Cryptography)
Posted on 2014-05-07 (3 Comments)
re: Solution, with a possible correction by Charlie (2014-05-07 14:53:18)
Difficulty: 3 of 5Under Synonym Surveillance (in Word Problems)
Posted on 2014-05-06 (3 Comments)
Solution computer solutions by Charlie (2014-05-06 14:51:22)
Difficulty: 3 of 5Under Mobile Phone Muse (in Logic)
Posted on 2014-05-05 (2 Comments)
Solution computer solutions by Charlie (2014-05-05 13:48:11)
Difficulty: 4 of 5Under Scitemahpla (in General)
Posted on 2014-05-03 (16 Comments)
re(3): att Charlie.....just typo .... by Charlie (2014-05-06 09:43:32)
re: att Charlie by Charlie (2014-05-05 22:21:46)
Solution All that my dictionary can provide by Charlie (2014-05-05 16:29:06)
Solution All that my dictionary can provide by Charlie (2014-05-05 16:29:02)
re(5): hint.....PARTIAL SPOILER by Charlie (2014-05-05 09:56:29)
re(5): hint.....PARTIAL SPOILER by Charlie (2014-05-05 09:49:04)
re(3): hint.....PARTIAL SPOILER by Charlie (2014-05-05 00:10:33)
Solution re: hint.....PARTIAL SPOILER by Charlie (2014-05-04 11:06:16)
Difficulty: 2 of 5Under Weird numbers (in Numbers)
Posted on 2014-05-02 (2 Comments)
Solution computer solution by Charlie (2014-05-02 16:50:42)
Difficulty: 3 of 5Under Powerful Divisor (in Just Math)
Posted on 2014-05-01 (8 Comments)
uh oh by Charlie (2014-05-01 16:42:57)
re: more examples by Charlie (2014-05-01 16:37:49)
Some Thoughts more examples by Charlie (2014-05-01 16:35:40)
Some Thoughts some examples by Charlie (2014-05-01 16:28:34)
Difficulty: 4 of 5Under Without you (in Numbers)
Posted on 2014-04-30 (2 Comments)
Solution computer solution by Charlie (2014-04-30 16:33:40)
Difficulty: 3 of 5Under Making a Multiple of Four (in Numbers)
Posted on 2014-04-30 (6 Comments)
Some Thoughts part 2 simulation by Charlie (2014-04-30 14:38:53)
re: Or maybe I'm simple (part I spoiler) by Charlie (2014-04-30 12:42:26)
Difficulty: 2 of 5Under The end of the line (in Cryptography)
Posted on 2014-04-29 (5 Comments)
Solution From my cryptogram dictionary by Charlie (2014-04-29 11:12:34)
Difficulty: 1 of 5Under I / O resolved (in Logic)
Posted on 2014-04-28 (4 Comments)
going farther by Charlie (2014-04-29 10:03:38)
Difficulty: 3 of 5Under Inscribed Circle (in Shapes)
Posted on 2014-04-27 (2 Comments)
Solution GSP method by Charlie (2014-04-27 15:52:02)
Difficulty: 1 of 5Under 5 Digit Number III (in Just Math)
Posted on 2014-04-22 (3 Comments)
Solution Proof by Charlie (2014-04-22 13:28:47)
Difficulty: 4 of 5Under Limiting Ratio II (in Calculus)
Posted on 2014-04-21 (1 Comments)
Solution the value numerically derived (spoiler) by Charlie (2014-04-21 13:46:49)
Difficulty: 2 of 5Under Trivia (in Numbers)
Posted on 2014-04-21 (7 Comments)
Solution alternative answer by Charlie (2014-04-21 12:07:25)
Difficulty: 3 of 5Under Set Theory (in General)
Posted on 2014-04-19 (3 Comments)
Some Thoughts re: attempt at the rest by Charlie (2014-04-19 14:49:15)
Some Thoughts attempt at the rest by Charlie (2014-04-19 11:01:51)
Some Thoughts right off the bat by Charlie (2014-04-19 09:39:42)
Difficulty: 2 of 5Under Neighbors (in Numbers)
Posted on 2014-04-18 (8 Comments)
re(2): computer solution by Charlie (2014-04-18 22:14:13)
Solution computer solution by Charlie (2014-04-18 13:02:09)
Difficulty: 4 of 5Under No way to win (in General)
Posted on 2014-04-17 (4 Comments)
re(2): computer solution for one of the two - att Charlie by Charlie (2014-04-19 09:27:41)
Solution both solutions now by Charlie (2014-04-19 09:14:38)
Solution computer solution for one of the two by Charlie (2014-04-19 01:13:13)
Difficulty: 3 of 5Under Mod 3 alphametics (in Just Math)
Posted on 2014-04-15 (2 Comments)
Solution In Basic code by Charlie (2014-04-15 16:21:51)
Difficulty: 2 of 5Under My phone is 2543663 (in Probability)
Posted on 2014-04-15 (5 Comments)
re: Two different exact answers by Charlie (2014-04-15 23:47:38)
Solution solution by Charlie (2014-04-15 12:49:18)
Difficulty: 4 of 5Under Pseudo-FIBO (in Sequences)
Posted on 2014-04-14 (5 Comments)
Solution computer solution part b by Charlie (2014-04-14 16:06:52)
Difficulty: 3 of 5Under Question Quandary (in Logic)
Posted on 2014-04-14 (2 Comments)
Solution computer solution--VB 5.0 by Charlie (2014-04-14 12:33:12)
Difficulty: 4 of 5Under The right subset (in Word Problems)
Posted on 2014-04-13 (2 Comments)
Some Thoughts computer exploration--words only; no phrases by Charlie (2014-04-13 13:02:11)
Difficulty: 3 of 5Under Upside down (OEIS A045573) (in Numbers)
Posted on 2014-04-11 (6 Comments)
re: Direct Basic solution by Charlie (2014-04-12 09:35:09)
Solution computer solution by Charlie (2014-04-11 15:47:31)
Difficulty: 3 of 5Under Four Cards (in Logic)
Posted on 2014-04-10 (2 Comments)
Solution the computer method by Charlie (2014-04-10 14:58:10)
Difficulty: 2 of 5Under Integer Divisibility Dilemma (in Just Math)
Posted on 2014-04-10 (6 Comments)
Some Thoughts Any with sum of x and y under 10000--no proof of completeness by Charlie (2014-04-10 11:58:58)
Difficulty: 3 of 5Under Family Murder Muse (in Logic)
Posted on 2014-04-09 (4 Comments)
Solution computer solution -- new computer by Charlie (2014-04-09 14:40:09)
Difficulty: 1 of 5Under A Quicky III (in Numbers)
Posted on 2014-04-09 (9 Comments)
re: How many are divisible by 1? by Charlie (2014-04-09 12:46:01)
Solution computer solution by Charlie (2014-04-09 12:35:01)
Difficulty: 3 of 5Under Consecutive Trio (in Just Math)
Posted on 2014-04-08 (3 Comments)
re: ANSWERS by Charlie (2014-04-08 16:38:20)
Solution computer solution by Charlie (2014-04-08 16:37:41)
Difficulty: 2 of 5Under No-primes sequence (in Numbers)
Posted on 2014-04-07 (1 Comments)
Solution computer solution by Charlie (2014-04-07 13:46:22)
Difficulty: 3 of 5Under Positively Palindromic (in Just Math)
Posted on 2014-04-06 (2 Comments)
Solution solution by Charlie (2014-04-06 20:50:04)
Difficulty: 3 of 5Under Fold Ratio (in Shapes)
Posted on 2014-04-05 (2 Comments)
Solution via Geometers' Sketchpad by Charlie (2014-04-06 01:04:18)
Difficulty: 1 of 5Under A Quicky II (in Numbers)
Posted on 2014-04-03 (7 Comments)
re(3): Clarification? by Charlie (2014-04-03 11:45:01)
Difficulty: 3 of 5Under Fold Judgement II (in Shapes)
Posted on 2014-04-01 (6 Comments)
Solution re: different value by Charlie (2014-04-01 22:44:54)
Solution Geometers' Sketchpad Solution by Charlie (2014-04-01 15:29:38)
re: Full solution by Charlie (2014-04-01 15:27:18)
Difficulty: 4 of 5Under Ternary train (in Just Math)
Posted on 2014-03-28 (3 Comments)
Solution computer solution by Charlie (2014-03-28 14:26:02)
Difficulty: 2 of 5Under In or out? (in Probability)
Posted on 2014-03-28 (2 Comments)
Solution very, very, very close to ... by Charlie (2014-03-28 10:58:30)
Difficulty: 4 of 5Under Harmless? (in General)
Posted on 2014-03-26 (2 Comments)
Solution computer solution by Charlie (2014-03-26 21:16:50)
Difficulty: 3 of 5Under Same Six Digits (in Just Math)
Posted on 2014-03-26 (6 Comments)
Solution program solution by Charlie (2014-03-26 10:59:32)
Difficulty: 4 of 5Under Words count (in Numbers)
Posted on 2014-03-25 (8 Comments)
re(2): solution to part 1; thoughts on part 2 by Charlie (2014-03-26 08:55:42)
Some Thoughts solution to part 1; thoughts on part 2 by Charlie (2014-03-25 15:41:33)
re(2): Solution by Charlie (2014-03-25 15:39:29)
Difficulty: 2 of 5Under How high? (in Numbers)
Posted on 2014-03-25 (4 Comments)
Solution of course there's brute force by Charlie (2014-03-25 11:06:18)
Difficulty: 3 of 5Under A coded phrase (in General)
Posted on 2014-03-24 (2 Comments)
Solution solution in Basic by Charlie (2014-03-24 14:03:07)
Difficulty: 3 of 5Under In pi at last (in Sequences)
Posted on 2014-03-24 (3 Comments)
Solution solution by Charlie (2014-03-24 10:35:18)
Difficulty: 3 of 5Under Factorial-Square Sum (in Just Math)
Posted on 2014-03-23 (7 Comments)
re: more by Charlie (2014-03-23 10:27:33)
Some Thoughts computer exploration by Charlie (2014-03-23 10:19:54)
Difficulty: 3 of 5Under Simultaneous Settlement IV (in Just Math)
Posted on 2014-03-22 (2 Comments)
Some Thoughts computer exploration by Charlie (2014-03-22 13:17:21)
Difficulty: 3 of 5Under Solution or solutions (in Sequences)
Posted on 2014-03-20 (6 Comments)
re(3): computer evaluation -- sums and products by Charlie (2014-03-21 00:18:08)
re(2): computer evaluation -- sums and products by Charlie (2014-03-20 23:06:48)
Some Thoughts computer evaluation by Charlie (2014-03-20 15:34:49)
Difficulty: 3 of 5Under Sum Divisibility Dilemma (in Just Math)
Posted on 2014-03-18 (6 Comments)
Some Thoughts solution by Charlie (2014-03-18 15:10:39)
Difficulty: 3 of 5Under Liars Logic 2 (in Liars and Knights)
Posted on 2014-03-17 (2 Comments)
Solution computer solution by Charlie (2014-03-17 16:25:04)
Difficulty: 3 of 5Under Safe Crack (in Just Math)
Posted on 2014-03-17 (3 Comments)
Solution computer solution by Charlie (2014-03-17 12:06:55)
Difficulty: 3 of 5Under Summing the factorials (in Numbers)
Posted on 2014-03-15 (3 Comments)
re: computer solution by Charlie (2014-03-16 09:12:03)
Difficulty: 3 of 5Under Liars Logic (in Liars and Knights)
Posted on 2014-03-13 (1 Comments)
Solution computer solution by Charlie (2014-03-13 19:18:44)
Difficulty: 3 of 5Under Prime Equation (in Just Math)
Posted on 2014-03-12 (4 Comments)
re: solution by Charlie (2014-03-13 08:36:18)
Some Thoughts computer exploration--no proof by Charlie (2014-03-12 15:14:27)
Difficulty: 4 of 5Under Ady's RH problem (in Logic)
Posted on 2014-03-11 (6 Comments)
for the curious on the question not asked by Charlie (2014-03-11 17:01:47)
Difficulty: 4 of 5Under A permuted multiplication (in Numbers)
Posted on 2014-03-11 (10 Comments)
Solution solution by Charlie (2014-03-11 14:30:36)
Difficulty: 2 of 5Under Pythagorean triangle (in Just Math)
Posted on 2014-03-10 (2 Comments)
Solution The 21 smallest by Charlie (2014-03-10 15:42:35)
Difficulty: 3 of 5Under Some Powers Sum Power (in Just Math)
Posted on 2014-03-09 (3 Comments)
re(2): Near Misses by Charlie (2014-03-09 18:55:13)
Difficulty: 3 of 5Under Chair Cue (in Logic)
Posted on 2014-03-07 (2 Comments)
Solution computer solution by Charlie (2014-03-07 12:50:56)
Difficulty: 3 of 5Under Capital City Conclusion (in General)
Posted on 2014-03-06 (3 Comments)
Solution computer solution by Charlie (2014-03-06 22:35:41)
Difficulty: 3 of 5Under Equilateral Crease II (in Shapes)
Posted on 2014-03-05 (3 Comments)
Some Thoughts GSP approximation by Charlie (2014-03-05 14:50:55)
Difficulty: 2 of 5Under Prime+reversal= prime (in Numbers)
Posted on 2014-03-04 (4 Comments)
Solution UBASIC solution by Charlie (2014-03-04 15:08:19)
Difficulty: 2 of 5Under Card game III (in Logic)
Posted on 2014-03-04 (5 Comments)
Solution solution by Charlie (2014-03-04 12:05:31)
Difficulty: 3 of 5Under Formula Formulation (in Just Math)
Posted on 2014-03-03 (4 Comments)
Some Thoughts re: first few -- larger n by Charlie (2014-03-03 17:27:31)
Some Thoughts first few by Charlie (2014-03-03 17:22:45)
Difficulty: 3 of 5Under Day-knights and night-knights 8 (in Logic)
Posted on 2014-03-03 (4 Comments)
re: W H Y ? by Charlie (2014-03-03 13:17:40)
Solution computer solution by Charlie (2014-03-03 13:17:00)
Difficulty: 3 of 5Under Minimizing Trigo value (in Numbers)
Posted on 2014-03-02 (7 Comments)
re(2): answer by Charlie (2014-03-02 18:45:59)
Difficulty: 3 of 5Under Switching Teams (in Probability)
Posted on 2014-02-28 (8 Comments)
re: n = 4 (spoiler) by Charlie (2014-02-28 17:51:23)
Solution solution by Charlie (2014-02-28 17:22:44)
re: To Charlie. by Charlie (2014-02-28 14:39:21)
Difficulty: 3 of 5Under Minimum Integer (in Just Math)
Posted on 2014-02-28 (4 Comments)
Solution re: Brute force solution by Charlie (2014-02-28 12:39:24)
Difficulty: 3 of 5Under Reverso (in Numbers)
Posted on 2014-02-27 (2 Comments)
Solution computer solution by Charlie (2014-02-27 17:05:19)
Difficulty: 2 of 5Under Special polygon (in Shapes)
Posted on 2014-02-27 (1 Comments)
Solution solution by Charlie (2014-02-27 12:39:52)
Difficulty: 3 of 5Under 8675309 (in Numbers)
Posted on 2014-02-26 (2 Comments)
Solution computer solution by Charlie (2014-02-26 17:07:50)
Difficulty: 3 of 5Under sum Up (in Numbers)
Posted on 2014-02-26 (5 Comments)
Solution probable computer solution by Charlie (2014-02-26 12:58:59)
Difficulty: 3 of 5Under Bullseye II (in Logic)
Posted on 2014-02-25 (3 Comments)
Solution computer solution by Charlie (2014-02-25 15:56:42)
Difficulty: 2 of 5Under All Odds (in Numbers)
Posted on 2014-02-24 (3 Comments)
Solution computer solution by Charlie (2014-02-24 12:34:01)
Difficulty: 3 of 5Under More mean median mode (in Just Math)
Posted on 2014-02-21 (3 Comments)
Solution possible solution by Charlie (2014-02-21 15:49:04)
Difficulty: 2 of 5Under Mean = median (in Just Math)
Posted on 2014-02-20 (4 Comments)
Solution solution by Charlie (2014-02-20 16:07:36)
Difficulty: 3 of 5Under Musicians (in Logic)
Posted on 2014-02-19 (6 Comments)
Some Thoughts Is this it? by Charlie (2014-02-20 18:22:35)
Difficulty: 3 of 5Under Absolute Value Muse (in Just Math)
Posted on 2014-02-19 (4 Comments)
re: General Solution -- Two geometric methods by Charlie (2014-02-20 09:56:14)
Solution solution by Charlie (2014-02-19 14:16:30)
Difficulty: 3 of 5Under Get a good look (in Calculus)
Posted on 2014-02-18 (5 Comments)
Solution solution by Charlie (2014-02-18 17:18:57)
Difficulty: 2 of 5Under Crime Commitment Conclusion III (in Logic)
Posted on 2014-02-18 (3 Comments)
Solution solution by Charlie (2014-02-18 13:38:25)
Difficulty: 3 of 5Under The Equiangular Hexagon (in Geometry)
Posted on 2014-02-17 (2 Comments)
Solution computer solution by Charlie (2014-02-17 17:32:03)
Difficulty: 3 of 5Under Six sets (in Numbers)
Posted on 2014-02-17 (7 Comments)
re(2): computer solution by Charlie (2014-02-18 23:39:08)
Solution computer solution by Charlie (2014-02-17 13:08:09)
Difficulty: 3 of 5Under Red Area (in Shapes)
Posted on 2014-02-16 (1 Comments)
Solution After playing with Geometers' Sketchpad by Charlie (2014-02-16 12:30:22)
Difficulty: 3 of 5Under What did I miss? (in Just Math)
Posted on 2014-02-14 (1 Comments)
Solution computer solution by Charlie (2014-02-15 15:49:39)
Difficulty: 3 of 5Under lcm reflection (in Just Math)
Posted on 2014-02-14 (2 Comments)
Solution computer solution by Charlie (2014-02-14 11:47:49)
Difficulty: 2 of 5Under Will Wangle (in Just Math)
Posted on 2014-02-13 (5 Comments)
Solution solution by Charlie (2014-02-13 12:17:07)
Difficulty: 3 of 5Under Five Hunters (in Logic)
Posted on 2014-02-12 (3 Comments)
Solution computer solution by Charlie (2014-02-13 01:30:14)
Difficulty: 3 of 5Under Largest Overlapped Area (in Shapes)
Posted on 2014-02-11 (3 Comments)
Solution Geometers' Sketchpad results by Charlie (2014-02-11 21:34:08)
Difficulty: 3 of 5Under Remove last three to get cube root (in Numbers)
Posted on 2014-02-11 (3 Comments)
Solution cell phone solution by Charlie (2014-02-11 11:11:21)
Difficulty: 3 of 5Under Quiz Results III (in Logic)
Posted on 2014-02-10 (4 Comments)
Solution computer solution by Charlie (2014-02-10 12:57:57)
Difficulty: 3 of 5Under Alphametic Base Baffle (in Just Math)
Posted on 2014-02-07 (2 Comments)
Solution computer solution by Charlie (2014-02-07 14:13:01)
Difficulty: 3 of 5Under Area Ascertainment (in Shapes)
Posted on 2014-02-06 (1 Comments)
Solution solution by Charlie (2014-02-06 16:36:27)
Difficulty: 3 of 5Under A Skirmish (in Logic)
Posted on 2014-02-05 (3 Comments)
Solution computer solution: 6 scenarios? by Charlie (2014-02-05 12:33:12)
Difficulty: 4 of 5Under My crazy die (in Probability)
Posted on 2014-02-03 (3 Comments)
Solution assuming a triplet must be consecutive within the number by Charlie (2014-02-03 18:47:16)
Difficulty: 3 of 5Under Hockey Score Settlement (in Logic)
Posted on 2014-02-03 (2 Comments)
Solution computer solution by Charlie (2014-02-03 13:22:32)
Difficulty: 2 of 5Under Deduction Problem (in Numbers)
Posted on 2014-01-31 (1 Comments)
Solution computer solution by Charlie (2014-01-31 22:00:07)
Difficulty: 3 of 5Under Four special squares (in Numbers)
Posted on 2014-01-30 (5 Comments)
Solution computer solution by Charlie (2014-01-30 18:51:01)
re: solutions by Charlie (2014-01-30 18:00:37)
Difficulty: 3 of 5Under Suit Settlement (in Logic)
Posted on 2014-01-29 (2 Comments)
Solution computer solution by Charlie (2014-01-29 18:55:46)
Difficulty: 3 of 5Under Potluck Dinner (in Logic)
Posted on 2014-01-27 (1 Comments)
Solution computer solution by Charlie (2014-01-27 21:43:27)
Difficulty: 2 of 5Under N & n (in Just Math)
Posted on 2014-01-27 (7 Comments)
98 results not requiring "distinct" by Charlie (2014-01-27 15:48:49)
re: Looking at my wall by Charlie (2014-01-27 13:36:49)
Solution computer solution for all the solutions by Charlie (2014-01-27 13:33:02)
Difficulty: 2 of 5Under Geography? Spelling? Logic? (in Tricks)
Posted on 2014-01-24 (4 Comments)
Some Thoughts question of identity by Charlie (2014-01-24 12:49:23)
Difficulty: 2 of 5Under An economic reality (in General)
Posted on 2014-01-23 (1 Comments)
Solution computer solution by Charlie (2014-01-23 17:19:20)
Difficulty: 3 of 5Under Restaurant Murder Muse (in Logic)
Posted on 2014-01-23 (3 Comments)
Solution computer solution by Charlie (2014-01-23 11:15:40)
Difficulty: 3 of 5Under Maximizing Matches Model (in Numbers)
Posted on 2014-01-22 (16 Comments)
re(7): restrictions - no spoiler (spoiler added) by Charlie (2014-01-26 10:49:48)
re(3): A start by Charlie (2014-01-23 09:56:50)
Question re: A start by Charlie (2014-01-22 16:01:15)
Some Thoughts My conventional tries by Charlie (2014-01-22 16:00:00)
Difficulty: 3 of 5Under Pumpkins 3 (in Weights and Scales)
Posted on 2014-01-22 (6 Comments)
Solution computer solution by Charlie (2014-01-22 11:38:11)
Difficulty: 3 of 5Under Tribe Travail (in Liars and Knights)
Posted on 2014-01-21 (3 Comments)
Solution computer solution by Charlie (2014-01-21 16:30:58)
Difficulty: 2 of 5Under Probing the prob. (in Probability)
Posted on 2014-01-21 (5 Comments)
re(2): 2nd question first (spoiler) rethink. by Charlie (2014-01-21 12:53:11)
Solution solution by Charlie (2014-01-21 12:51:18)
Difficulty: 3 of 5Under Created after midnight (in General)
Posted on 2014-01-20 (2 Comments)
Solution computer solution (spoiler) by Charlie (2014-01-20 19:15:36)
Difficulty: 3 of 5Under Seven Multiple Muse II (in Just Math)
Posted on 2014-01-17 (1 Comments)
Solution computer solution by Charlie (2014-01-17 12:49:46)
Difficulty: 3 of 5Under Some Squares Sum Year (in Just Math)
Posted on 2014-01-16 (2 Comments)
re: I can program -- same answers in Basic by Charlie (2014-01-16 15:53:34)
Difficulty: 3 of 5Under Impostor Identification (in Logic)
Posted on 2014-01-15 (2 Comments)
Solution computer solution by Charlie (2014-01-15 12:41:58)
Difficulty: 3 of 5Under U * I = $$$ (in General)
Posted on 2014-01-14 (1 Comments)
Solution computer solution by Charlie (2014-01-14 17:49:20)
Difficulty: 2 of 5Under Repeated Digits (in Sequences)
Posted on 2014-01-14 (2 Comments)
Solution computer solution by Charlie (2014-01-14 11:55:29)
Difficulty: 3 of 5Under Numerators sum also (in Numbers)
Posted on 2014-01-13 (1 Comments)
Solution computer solution by Charlie (2014-01-13 17:40:03)
Difficulty: 3 of 5Under Factorial Difference Digits (in Just Math)
Posted on 2014-01-12 (6 Comments)
Solution How it could be done with a calculator (spoiler) by Charlie (2014-01-12 17:23:08)
re(2): A thought by Charlie (2014-01-12 13:52:54)
Hints/Tips A thought by Charlie (2014-01-12 12:19:41)
Difficulty: 3 of 5Under A missing proverb (in General)
Posted on 2014-01-09 (3 Comments)
Solution computer solution by Charlie (2014-01-09 18:47:47)
Difficulty: 2 of 5Under Unusual Crossword Puzzle (in Word Problems)
Posted on 2014-01-09 (6 Comments)
typos in official solution by Charlie (2014-01-18 10:57:29)
Difficulty: 3 of 5Under Witness Wangle (in Logic)
Posted on 2014-01-08 (1 Comments)
Solution computer solution by Charlie (2014-01-08 16:08:35)
Difficulty: 3 of 5Under A quotation (in Numbers)
Posted on 2014-01-07 (2 Comments)
Solution computer solution by Charlie (2014-01-07 18:05:03)
Difficulty: 3 of 5Under Name Determination (in Logic)
Posted on 2014-01-07 (1 Comments)
Solution computer solution by Charlie (2014-01-07 14:47:33)
Difficulty: 3 of 5Under A hidden message (in Cryptography)
Posted on 2014-01-06 (5 Comments)
Some Thoughts re(2): 0919192 etc HINT -re keyword by Charlie (2014-01-07 14:40:06)
Difficulty: 3 of 5Under Palindromic and p-gonal (in Just Math)
Posted on 2014-01-05 (1 Comments)
Solution computer solution by Charlie (2014-01-05 17:47:49)
Difficulty: 2 of 5Under Simple trigo (in Geometry)
Posted on 2014-01-03 (6 Comments)
re: trying to post thru notepad by Charlie (2014-01-05 10:19:27)
re: tan15 FIRST by Charlie (2014-01-03 17:26:09)
Difficulty: 3 of 5Under Primed and Perfect (in Just Math)
Posted on 2014-01-03 (1 Comments)
Solution computer solution by Charlie (2014-01-03 12:47:43)
Difficulty: 3 of 5Under Supreme Subset (in Just Math)
Posted on 2014-01-02 (8 Comments)
Solution re: Blindly crossing possible solution by Charlie (2014-01-02 15:14:37)
Difficulty: 3 of 5Under Pairagrams (in Word Problems)
Posted on 2013-12-31 (1 Comments)
Some Thoughts computer exploration of bonus tasks by Charlie (2013-12-31 11:53:19)
Difficulty: 3 of 5Under Palindromic and prime (in Numbers)
Posted on 2013-12-30 (1 Comments)
Solution computer solution by Charlie (2013-12-30 17:45:16)
Difficulty: 2 of 5Under Boys' names (in Word Problems)
Posted on 2013-12-30 (10 Comments)
re(2): Names by Charlie (2014-01-03 13:27:35)
Solution re: Names by Charlie (2014-01-03 13:23:43)
re: No-brainer by Charlie (2013-12-31 00:02:41)
Solution from a larger data base by Charlie (2013-12-30 15:20:19)
Solution No Subject by Charlie (2013-12-30 12:17:33)
Difficulty: 2 of 5Under Trigonometric product (in Numbers)
Posted on 2013-12-29 (8 Comments)
Solution computer solution by Charlie (2013-12-29 14:56:59)
Some Thoughts computer exploration--table of values by Charlie (2013-12-29 13:26:28)
Difficulty: 3 of 5Under Going Maximum With Harmonic (in Just Math)
Posted on 2013-12-28 (2 Comments)
Solution computer solution by Charlie (2013-12-28 16:00:13)
Difficulty: 3 of 5Under Simultaneous Settlement III (in Just Math)
Posted on 2013-12-27 (1 Comments)
Solution solution without extra challenge (spoiler) by Charlie (2013-12-27 17:29:39)
Difficulty: 3 of 5Under A sum of 3 (in Numbers)
Posted on 2013-12-27 (2 Comments)
re: computer solutions by Charlie (2013-12-27 13:14:13)
Solution computer solutions by Charlie (2013-12-27 12:41:32)
Difficulty: 3 of 5Under Hotel Room Rumination (in Logic)
Posted on 2013-12-26 (5 Comments)
Solution computer solution by Charlie (2013-12-26 16:05:19)
Difficulty: 3 of 5Under A neat trick (in Tricks)
Posted on 2013-12-26 (5 Comments)
re: I would need a calculator (spoiler) by Charlie (2013-12-26 13:34:29)
Difficulty: 2 of 5Under Algebra and Primes (in Numbers)
Posted on 2013-12-25 (3 Comments)
Some Thoughts computer exploration (spoiler) by Charlie (2013-12-25 12:22:06)
Difficulty: 3 of 5Under Tic Tac Toe II (in Probability)
Posted on 2013-12-24 (2 Comments)
verification by simulation by Charlie (2013-12-24 21:45:24)
Solution computer aided solution by Charlie (2013-12-24 20:41:09)
Difficulty: 1 of 5Under Hidden Animals (in General)
Posted on 2013-12-24 (4 Comments)
Solution solution by Charlie (2013-12-24 11:12:03)
Difficulty: 3 of 5Under Seven Multiple Muse (in Just Math)
Posted on 2013-12-23 (1 Comments)
Solution computer solution by Charlie (2013-12-23 23:28:37)
Difficulty: 2 of 5Under Madam Marathon (in Just Math)
Posted on 2013-12-23 (1 Comments)
Solution solution by Charlie (2013-12-23 12:37:42)
Difficulty: 3 of 5Under Divisible By 2475 (in Just Math)
Posted on 2013-12-20 (1 Comments)
Solution non-computer solution by Charlie (2013-12-20 17:32:31)
Difficulty: 3 of 5Under Array Arrangement (in Just Math)
Posted on 2013-12-19 (1 Comments)
Solution computer solution by Charlie (2013-12-19 19:07:41)
Difficulty: 3 of 5Under Algorithm requested (in Algorithms)
Posted on 2013-12-18 (3 Comments)
Some Thoughts a couple of algorithms by Charlie (2013-12-18 13:09:55)
Difficulty: 3 of 5Under Unitary perfect numbers (in Just Math)
Posted on 2013-12-16 (10 Comments)
re(3): just ...correction by Charlie (2013-12-17 10:07:19)
re(3): just look up by SH by Charlie (2013-12-17 10:04:18)
re: just look up - spoiler by Charlie (2013-12-16 16:41:29)
Solution computer solution by Charlie (2013-12-16 16:26:07)
Difficulty: 2 of 5Under Dueling Weathermen (in Probability)
Posted on 2013-12-16 (1 Comments)
Solution Bayes by Charlie (2013-12-16 12:33:04)
Difficulty: 3 of 5Under All 1's (in Numbers)
Posted on 2013-12-14 (3 Comments)
re(2): Divide and conquer (spoiler) & a challenge by Charlie (2013-12-15 10:14:07)
Difficulty: 3 of 5Under Widow Surmise (in Logic)
Posted on 2013-12-12 (5 Comments)
Solution computer solution by Charlie (2013-12-12 17:51:21)
Difficulty: 2 of 5Under Last but not the least (in Numbers)
Posted on 2013-12-12 (8 Comments)
re(4): All things being equal ... (spoiler) by Charlie (2013-12-13 01:54:49)
re(2): All things being equal ... (spoiler) by Charlie (2013-12-12 11:13:20)
Difficulty: 3 of 5Under Profession Pursuit (in Logic)
Posted on 2013-12-11 (4 Comments)
Solution computer solution by Charlie (2013-12-11 16:10:40)
Difficulty: 2 of 5Under Who's asking? (in Word Problems)
Posted on 2013-12-11 (6 Comments)
re(2): I'll play (spoiler) by Charlie (2013-12-13 12:33:30)
Difficulty: 4 of 5Under Square Crossed Sequence (in Sequences)
Posted on 2013-12-09 (3 Comments)
Some Thoughts computer exploration -- no proof of completeness by Charlie (2013-12-09 16:43:04)
Difficulty: 2 of 5Under Two Rectangles (in Geometry)
Posted on 2013-12-09 (2 Comments)
Solution computer solutions by Charlie (2013-12-09 13:28:31)
Difficulty: 4 of 5Under Feet-Inch Transpose (in Weights and Scales)
Posted on 2013-12-06 (7 Comments)
re: Disclaimer by Charlie (2013-12-07 00:09:20)
Solution computer solution by Charlie (2013-12-06 17:05:59)
Difficulty: 3 of 5Under 1998 (in Numbers)
Posted on 2013-12-05 (5 Comments)
re: Just the first -- UBASIC code agrees by Charlie (2013-12-05 15:50:09)
Some Thoughts part 3 using UBASIC by Charlie (2013-12-05 15:46:56)
Some Thoughts part 2? by Charlie (2013-12-05 15:42:00)
Difficulty: 3 of 5Under Logical Choice (in Logic)
Posted on 2013-12-05 (4 Comments)
Solution solution by Charlie (2013-12-05 15:34:39)
re: liars sometimes prosper (spoiler?) by Charlie (2013-12-05 14:38:16)
Difficulty: 3 of 5Under Consecutive Base Baffle (in Just Math)
Posted on 2013-12-04 (4 Comments)
Solution computer solution by Charlie (2013-12-04 17:56:33)
Difficulty: 2 of 5Under APPLE + LEMON = BANANA (in Numbers)
Posted on 2013-12-04 (5 Comments)
re(4): answer - spoiler eddited: no tables by Charlie (2013-12-05 09:45:09)
re: answer - spoiler by Charlie (2013-12-04 13:26:54)
Difficulty: 2 of 5Under My first is in MEAT, but not in FEET (in Tricks)
Posted on 2013-12-03 (1 Comments)
Solution solution by Charlie (2013-12-03 16:13:13)
Difficulty: 3 of 5Under Lively Letters (in Logic)
Posted on 2013-12-02 (8 Comments)
Solution If computers had been allowed, there'd still be room for some logic. by Charlie (2013-12-03 11:28:24)
Difficulty: 3 of 5Under Continued Multiples (in Numbers)
Posted on 2013-11-29 (3 Comments)
Solution computer solution by Charlie (2013-11-29 17:18:15)
Difficulty: 3 of 5Under Quiz Quandary II (in Logic)
Posted on 2013-11-29 (6 Comments)
Solution computer solutions by Charlie (2013-11-29 12:34:03)
Difficulty: 4 of 5Under Pentagon in a Square (in Geometry)
Posted on 2013-11-28 (2 Comments)
Solution solution by Charlie (2013-11-28 13:11:40)
Difficulty: 4 of 5Under Harmonic Harness (in Probability)
Posted on 2013-11-27 (2 Comments)
Solution computer solution and extension, but not the bonus by Charlie (2013-11-27 16:45:02)
Difficulty: 2 of 5Under Hexagonal Palindrome (in Just Math)
Posted on 2013-11-26 (2 Comments)
Solution computer solution by Charlie (2013-11-26 19:42:25)
Difficulty: 2 of 5Under Equal sums on a circle (in General)
Posted on 2013-11-26 (1 Comments)
Solution computer solution by Charlie (2013-11-26 12:13:40)
Difficulty: 3 of 5Under 20 Word Lattice I (in Word Problems)
Posted on 2013-11-25 (5 Comments)
Solution computer solution by Charlie (2013-11-25 17:56:11)
Difficulty: 3 of 5Under Day-knights and night-knights 7 (in Logic)
Posted on 2013-11-25 (1 Comments)
Solution solution by Charlie (2013-11-25 14:01:08)
Difficulty: 3 of 5Under A 6-digit answer (in Numbers)
Posted on 2013-11-24 (2 Comments)
Solution computer solution by Charlie (2013-11-24 13:21:52)
Difficulty: 3 of 5Under Eve & Odd (in Numbers)
Posted on 2013-11-22 (6 Comments)
Solution computer solution by Charlie (2013-11-23 15:22:55)
Difficulty: 3 of 5Under Upon Reflection (in Logic)
Posted on 2013-11-22 (13 Comments)
Some Thoughts Is this it? by Charlie (2013-11-22 12:56:19)
Difficulty: 2 of 5Under Testing Three Students (in Just Math)
Posted on 2013-11-20 (4 Comments)
Solution solution by Charlie (2013-11-20 13:11:37)
Difficulty: 2 of 5Under LCM equation (in Numbers)
Posted on 2013-11-19 (6 Comments)
re(2): Proof by Charlie (2013-11-20 09:46:52)
Solution Proof by Charlie (2013-11-19 18:11:31)
Difficulty: 3 of 5Under 8 dice, 3 questions (in Numbers)
Posted on 2013-11-18 (1 Comments)
Solution computer solutions for (a) and (c) by Charlie (2013-11-18 21:28:31)
Difficulty: 3 of 5Under Embedded Triangles (in Shapes)
Posted on 2013-11-16 (1 Comments)
Some Thoughts playing with GSP by Charlie (2013-11-16 11:39:19)
Difficulty: 3 of 5Under Digital Dilemma (in Just Math)
Posted on 2013-11-15 (7 Comments)
re(2): The last few digits of a smaller number by Charlie (2013-11-17 10:16:04)
Some Thoughts thoughts on part 2 by Charlie (2013-11-15 12:24:35)
Some Thoughts computer-aided solution to part 1 by Charlie (2013-11-15 12:16:03)
Difficulty: 3 of 5Under Define winning strategy (in Games)
Posted on 2013-11-14 (6 Comments)
Solution within the constraints by Charlie (2013-11-15 09:47:57)
re: How to win. by Charlie (2013-11-15 09:41:54)
Difficulty: 2 of 5Under Four Egyptian Fractions (in Numbers)
Posted on 2013-11-13 (6 Comments)
Solution computer solution by Charlie (2013-11-13 16:18:04)
Difficulty: 3 of 5Under Consecutive Additions (in Numbers)
Posted on 2013-11-12 (6 Comments)
re(2): computer solution - wondering by Charlie (2013-11-12 19:51:12)
Solution computer solution by Charlie (2013-11-12 18:52:56)
Difficulty: 2 of 5Under Slippery Supplier (in Weights and Scales)
Posted on 2013-11-12 (6 Comments)
Solution solution. by Charlie (2013-11-12 13:53:16)
Difficulty: 3 of 5Under Finding Good Batteries (in Weights and Scales)
Posted on 2013-11-11 (8 Comments)
re(2): my solution by Charlie (2013-11-12 00:11:51)
Solution my solution by Charlie (2013-11-11 17:27:25)
Difficulty: 1 of 5Under Covert Quantity IV (in Numbers)
Posted on 2013-11-11 (1 Comments)
Solution solution by Charlie (2013-11-11 14:03:17)
Difficulty: 3 of 5Under Hexagon in a square (in Shapes)
Posted on 2013-11-10 (1 Comments)
Solution solution by Charlie (2013-11-10 15:25:21)
Difficulty: 3 of 5Under Two possible sums (in Numbers)
Posted on 2013-11-08 (1 Comments)
Solution computer solution by Charlie (2013-11-08 17:25:13)
Difficulty: 3 of 5Under Some Powers Sum 2008 (in Just Math)
Posted on 2013-11-08 (3 Comments)
Solution re: more results by Charlie (2013-11-08 17:39:58)
Solution computer solution by Charlie (2013-11-08 13:34:46)
Difficulty: 3 of 5Under Dart Discharge (in Logic)
Posted on 2013-11-07 (2 Comments)
Solution computer solution by Charlie (2013-11-07 11:39:56)
Difficulty: 3 of 5Under 8_Primes IV (in Numbers)
Posted on 2013-11-06 (1 Comments)
Solution computer solutions by Charlie (2013-11-06 17:30:35)
Difficulty: 2 of 5Under Word Grids (in Word Problems)
Posted on 2013-11-06 (1 Comments)
Solution Solution by Charlie (2013-11-06 13:00:02)
Difficulty: 2 of 5Under Four Digits (in Numbers)
Posted on 2013-11-05 (4 Comments)
Solution computer solution by Charlie (2013-11-05 13:17:32)
Difficulty: 3 of 5Under Quadratic Quandary (in Just Math)
Posted on 2013-11-04 (6 Comments)
Solution Two real solutions by Charlie (2013-11-06 09:58:00)
Jer seems right; I must have erred somewhere by Charlie (2013-11-04 15:58:22)
Some Thoughts roots by Charlie (2013-11-04 15:53:00)
Difficulty: 2 of 5Under Triangles And Rectangles Pair (in Geometry)
Posted on 2013-11-01 (1 Comments)
Solution computer solution by Charlie (2013-11-01 11:27:22)
Difficulty: 3 of 5Under Fold Judgement (in Shapes)
Posted on 2013-10-30 (1 Comments)
Solution solution by Charlie (2013-10-30 22:33:17)
Difficulty: 3 of 5Under Polycubic surface (in Shapes)
Posted on 2013-10-29 (1 Comments)
Solution possible solution by Charlie (2013-10-29 14:50:06)
Difficulty: 3 of 5Under Slow Cows (in General)
Posted on 2013-10-28 (4 Comments)
Solution solution by Charlie (2013-10-28 13:02:30)
Difficulty: 3 of 5Under Drinking Dwarfs (in Just Math)
Posted on 2013-10-23 (6 Comments)
Hints/Tips towards a solution by Charlie (2013-10-23 14:55:44)
Difficulty: 2 of 5Under Sum of Cubes (in Numbers)
Posted on 2013-10-23 (5 Comments)
Some Thoughts going further with the computer, but still 14 missing by Charlie (2013-10-23 12:55:41)
Some Thoughts re: Computer findings, leaving 45 cases for analytic methods--list continued by Charlie (2013-10-23 12:24:51)
Some Thoughts Computer findings, leaving 45 cases for analytic methods by Charlie (2013-10-23 12:22:42)
Difficulty: 3 of 5Under 8_Primes III (in Numbers)
Posted on 2013-10-21 (1 Comments)
Solution computer solutions by Charlie (2013-10-21 20:21:42)
Difficulty: 2 of 5Under Five by Five (in Numbers)
Posted on 2013-10-21 (2 Comments)
Solution modular solution by Charlie (2013-10-21 13:05:30)
Difficulty: 3 of 5Under Take the right one (in Weights and Scales)
Posted on 2013-10-18 (18 Comments)
re(2): question for Kenny by Charlie (2013-10-19 01:38:08)
Difficulty: 3 of 5Under Geo-alphametic (in General)
Posted on 2013-10-16 (2 Comments)
Solution computer solution by Charlie (2013-10-16 15:45:32)
Difficulty: 3 of 5Under 8_Primes II (in Numbers)
Posted on 2013-10-15 (1 Comments)
Solution computer solution by Charlie (2013-10-15 20:42:09)
Difficulty: 3 of 5Under Reciprocal Equation #5 (in Just Math)
Posted on 2013-10-15 (3 Comments)
Solution computer generated answers without proof by Charlie (2013-10-15 12:41:22)
Difficulty: 3 of 5Under Tank draining (in Algorithms)
Posted on 2013-10-14 (6 Comments)
Some Thoughts more complex than it seems at first glance by Charlie (2013-10-14 17:29:43)
Difficulty: 2 of 5Under LCM by pairs (in Just Math)
Posted on 2013-10-14 (4 Comments)
Solution analytic and computer solutions by Charlie (2013-10-14 10:38:52)
Difficulty: 3 of 5Under Milestone Muse (in Just Math)
Posted on 2013-10-10 (3 Comments)
Solution computer solution by Charlie (2013-10-11 00:35:06)
Difficulty: 3 of 5Under Hobsons choice(?) (in Numbers)
Posted on 2013-10-10 (9 Comments)
Solution computer solution with interpretation by Charlie (2013-10-12 17:53:20)
Difficulty: 3 of 5Under 8_Primes I (in Numbers)
Posted on 2013-10-09 (1 Comments)
Solution computer solutions by Charlie (2013-10-09 18:06:22)
Difficulty: 3 of 5Under Race Resolution (in Just Math)
Posted on 2013-10-08 (2 Comments)
Solution solution by Charlie (2013-10-08 18:09:07)
Difficulty: 2 of 5Under Two cars, three towns (in Just Math)
Posted on 2013-10-07 (3 Comments)
Solution solution if I did the algebra right by Charlie (2013-10-07 17:28:46)
Difficulty: 3 of 5Under 4x4 Grid Logic III (in Logic)
Posted on 2013-10-07 (2 Comments)
Solution p and p solution by Charlie (2013-10-07 11:54:23)
Difficulty: 3 of 5Under First Floobles Factorization (in General)
Posted on 2013-10-04 (2 Comments)
Solution computer solution by Charlie (2013-10-04 19:51:51)
Difficulty: 3 of 5Under Feisty Fifty-six (in Just Math)
Posted on 2013-10-04 (5 Comments)
Solution computer solution by Charlie (2013-10-04 11:44:12)
Difficulty: 3 of 5Under GCD to product (in Just Math)
Posted on 2013-10-03 (4 Comments)
Solution computer solution by Charlie (2013-10-04 11:48:37)
Difficulty: 3 of 5Under Host Colligation (in Logic)
Posted on 2013-10-02 (2 Comments)
Solution computer solution by Charlie (2013-10-02 12:20:52)
Difficulty: 3 of 5Under Repunit Rigor II (in Just Math)
Posted on 2013-10-01 (3 Comments)
Solution computer exploration by Charlie (2013-10-01 19:35:16)
Difficulty: 3 of 5Under Imperfectly Cubed (in Just Math)
Posted on 2013-09-29 (6 Comments)
Solution re(4): computer solutioNs ....NOT YET by Charlie (2013-09-30 00:28:11)
Solution re(2): computer solutios by Charlie (2013-09-29 20:00:04)
Solution computer solutios by Charlie (2013-09-29 12:02:18)
Difficulty: 3 of 5Under Simultaneous Settlement II (in Just Math)
Posted on 2013-09-26 (3 Comments)
Solution solution by Charlie (2013-09-26 13:01:45)
Difficulty: 3 of 5Under Sequence Limit (in Calculus)
Posted on 2013-09-24 (2 Comments)
Solution Heuristic method by Charlie (2013-09-24 13:26:21)
Difficulty: 3 of 5Under Prime with distinct digits (in Numbers)
Posted on 2013-09-18 (2 Comments)
Solution computer solution by Charlie (2013-09-18 17:33:46)
Difficulty: 3 of 5Under Age Ascertainment IV (in Logic)
Posted on 2013-09-18 (2 Comments)
Solution solution?? by Charlie (2013-09-18 12:30:43)
Difficulty: 3 of 5Under Big areas (in Numbers)
Posted on 2013-09-17 (16 Comments)
re: att: Charlie by Charlie (2013-09-20 23:43:20)
re(4): No Subject -- solution continued by Charlie (2013-09-18 00:25:37)
Solution re: No Subject -- solution continued by Charlie (2013-09-17 18:17:29)
Solution No Subject by Charlie (2013-09-17 18:15:52)
Difficulty: 3 of 5Under Nominal Expression Sum (in Just Math)
Posted on 2013-09-17 (4 Comments)
Solution My faulty p'n'p and successful computer solution. by Charlie (2013-09-17 13:49:24)
Difficulty: 3 of 5Under Staggered divisibility (in Numbers)
Posted on 2013-09-16 (3 Comments)
Solution computer solution by Charlie (2013-09-16 11:51:44)
Difficulty: 3 of 5Under Connnected Construction (in Just Math)
Posted on 2013-09-13 (2 Comments)
Solution computer solution by Charlie (2013-09-13 12:24:44)
Difficulty: 2 of 5Under Divisibility wanted (in Numbers)
Posted on 2013-09-12 (1 Comments)
Solution computer solution by Charlie (2013-09-12 15:46:20)
Difficulty: 3 of 5Under Prime candidates (in Numbers)
Posted on 2013-09-11 (2 Comments)
Some Thoughts computer exploration by Charlie (2013-09-11 17:08:30)
Difficulty: 2 of 5Under Mysterious Sequence (in Sequences)
Posted on 2013-09-11 (3 Comments)
Solution taking the hints by Charlie (2013-09-12 00:15:39)
Difficulty: 3 of 5Under Current Age Conclusion (in Logic)
Posted on 2013-09-10 (5 Comments)
Solution Hybrid solution: part computer, then p'n'p by Charlie (2013-09-10 17:33:12)
Difficulty: 3 of 5Under Safe Combination (in Logic)
Posted on 2013-09-09 (2 Comments)
Solution computer solution by Charlie (2013-09-09 17:29:58)
Difficulty: 3 of 5Under Different Routes (in Logic)
Posted on 2013-09-09 (2 Comments)
Solution computer solution by Charlie (2013-09-09 12:11:38)
Difficulty: 3 of 5Under The Great (in Just Math)
Posted on 2013-09-06 (2 Comments)
Solution solution to a, and algorithm for b by Charlie (2013-09-09 13:03:14)
Some Thoughts Where to find the sequence by Charlie (2013-09-09 09:47:10)
Difficulty: 2 of 5Under Two top targets (in Numbers)
Posted on 2013-09-06 (2 Comments)
Solution computer solution by Charlie (2013-09-06 12:10:14)
Difficulty: 4 of 5Under Expression Ratio (in Just Math)
Posted on 2013-09-03 (4 Comments)
Solution No Subject by Charlie (2013-09-03 19:51:38)
Difficulty: 3 of 5Under Odd Men Continued (in General)
Posted on 2013-09-02 (1 Comments)
Solution computer-aided decoding by Charlie (2013-09-02 21:31:11)
Difficulty: 2 of 5Under How many children? (in Just Math)
Posted on 2013-09-02 (6 Comments)
Solution computer solution by Charlie (2013-09-02 14:20:54)
Difficulty: 3 of 5Under The Broken Cash Register (in Just Math)
Posted on 2013-08-30 (1 Comments)
Solution computer solution by Charlie (2013-08-30 17:29:10)
Difficulty: 3 of 5Under Crossnumber III (in General)
Posted on 2013-08-29 (5 Comments)
Hints/Tips Hint set by Charlie (2013-08-30 10:10:45)
Question question intended by Charlie (2013-08-29 22:35:37)
Difficulty: 2 of 5Under NegaFibo series (in Numbers)
Posted on 2013-08-29 (2 Comments)
Solution solution by Charlie (2013-08-29 13:58:12)
Difficulty: 3 of 5Under Wild and Wooley Numbers (in Numbers)
Posted on 2013-08-28 (2 Comments)
Solution Part 1: producing the 5. No extra credit. by Charlie (2013-08-28 15:50:03)
Difficulty: 3 of 5Under The Two Cubes (in Logic)
Posted on 2013-08-28 (1 Comments)
Solution solution by Charlie (2013-08-28 13:30:29)
Difficulty: 2 of 5Under The 1979 Series (in Sequences)
Posted on 2013-08-27 (1 Comments)
Solution computer solution by Charlie (2013-08-27 18:07:02)
Difficulty: 3 of 5Under Uncle Christmas (in Logic)
Posted on 2013-08-27 (3 Comments)
re(2): computer solution by Charlie (2013-09-01 16:37:40)
Solution computer solution by Charlie (2013-08-27 13:17:51)
Difficulty: 3 of 5Under River Trip (in Logic)
Posted on 2013-08-26 (4 Comments)
re: Solution by Charlie (2013-08-27 10:16:10)
Solution computer solution by Charlie (2013-08-26 17:11:39)
Difficulty: 2 of 5Under Mission impossible II (in Numbers)
Posted on 2013-08-26 (7 Comments)
Gosh, and aha by Charlie (2013-08-27 10:19:08)
re(2): thoughts clarification by Charlie (2013-08-26 21:28:26)
Some Thoughts thoughts by Charlie (2013-08-26 13:44:58)
Difficulty: 3 of 5Under The cunning Condition (in Just Math)
Posted on 2013-08-25 (5 Comments)
re(3): answer ONLY - spoiler by Charlie (2013-08-25 15:00:12)
Difficulty: 3 of 5Under Decimal Digit Determination (in Just Math)
Posted on 2013-08-24 (5 Comments)
Some Thoughts much of a problem even with a computer by Charlie (2013-08-24 16:38:26)
Difficulty: 3 of 5Under FOUR SQUARES (in Numbers)
Posted on 2013-08-23 (1 Comments)
Solution computer-guided solution by Charlie (2013-08-23 22:55:26)
Difficulty: 3 of 5Under Z for Zero, X for siX (in Just Math)
Posted on 2013-08-22 (4 Comments)
Solution computer method by Charlie (2013-08-22 16:10:47)
Difficulty: 3 of 5Under Temperature Temperament III (in Weights and Scales)
Posted on 2013-08-21 (2 Comments)
Some Thoughts computer solutions for 15 pourings or fewer by Charlie (2013-08-22 02:02:01)
Difficulty: 3 of 5Under Covert Quantity II (in Logic)
Posted on 2013-08-20 (3 Comments)
Solution computer solution by Charlie (2013-08-20 14:40:20)
Difficulty: 3 of 5Under Tread Ware (in General)
Posted on 2013-08-20 (5 Comments)
Solution evolution of a solution by Charlie (2013-08-20 12:18:29)
Difficulty: 3 of 5Under Block Positions (in Logic)
Posted on 2013-08-19 (1 Comments)
Solution computer solution by Charlie (2013-08-19 19:34:12)
Difficulty: 3 of 5Under Walking the Blank (in Probability)
Posted on 2013-08-19 (4 Comments)
Solution solution by Charlie (2013-08-19 12:27:31)
Difficulty: 2 of 5Under Random Queens (in Probability)
Posted on 2013-08-16 (1 Comments)
Solution solution by Charlie (2013-08-16 13:47:12)
Difficulty: 3 of 5Under Pidigital primes (in Numbers)
Posted on 2013-08-15 (1 Comments)
Solution computer solution by Charlie (2013-08-15 19:26:45)
Difficulty: 3 of 5Under NegaBinary Numbers (in Algorithms)
Posted on 2013-08-14 (2 Comments)
Solution solution by Charlie (2013-08-15 02:37:51)
Difficulty: 3 of 5Under Sitting on the Fence (in Probability)
Posted on 2013-08-13 (5 Comments)
re(2): solution, different result by Charlie (2013-08-13 13:54:51)
Difficulty: 3 of 5Under Ten Items and Two Boxes (in Logic)
Posted on 2013-08-12 (2 Comments)
program generating the list by Charlie (2013-08-13 01:54:34)
Solution solution by Charlie (2013-08-13 01:52:49)
Difficulty: 2 of 5Under Seven - with and without (in Numbers)
Posted on 2013-08-09 (6 Comments)
Solution solution by Charlie (2013-08-09 12:53:08)
Difficulty: 3 of 5Under The Far Sides (in Numbers)
Posted on 2013-08-08 (1 Comments)
Solution If... by Charlie (2013-08-08 16:09:25)
Difficulty: 3 of 5Under Geometric Sequence Settlement (in Sequences)
Posted on 2013-08-07 (4 Comments)
Some Thoughts expanded list; no proof of completeness by Charlie (2013-08-07 12:45:22)
Some Thoughts computer partial solution by Charlie (2013-08-07 12:28:09)
Difficulty: 2 of 5Under Telly's calendar (in Shapes)
Posted on 2013-08-06 (5 Comments)
re: Computer aided - all solutions. by Charlie (2013-09-23 12:26:21)
Solution Solution by Charlie (2013-08-06 13:59:23)
Difficulty: 3 of 5Under The bottom line (in Logic)
Posted on 2013-08-05 (2 Comments)
Solution computer-assisted solution by Charlie (2013-08-05 21:23:51)
Difficulty: 2 of 5Under Round Results (in Numbers)
Posted on 2013-08-05 (4 Comments)
Solution re: a few more by Charlie (2013-08-05 22:17:25)
Solution computer solution by Charlie (2013-08-05 13:36:27)
Difficulty: 3 of 5Under Testy Triplet Treat (in Just Math)
Posted on 2013-08-04 (7 Comments)
re(2): results so far, but no proof in sight by Charlie (2013-08-06 10:07:34)
re: results so far, but no proof in sight by Charlie (2013-08-05 09:50:41)
re: results so far, but no proof in sight by Charlie (2013-08-04 12:55:17)
Some Thoughts results so far, but no proof in sight by Charlie (2013-08-04 12:53:46)
Difficulty: 2 of 5Under Day-knights and night-knights 6 (in Logic)
Posted on 2013-08-02 (5 Comments)
re: answer by Charlie (2013-08-02 13:28:26)
Difficulty: 3 of 5Under Near Pythagoras (in Just Math)
Posted on 2013-07-31 (4 Comments)
re(2): computer solution by Charlie (2013-08-01 09:41:59)
Solution computer solution by Charlie (2013-07-31 18:13:43)
Difficulty: 4 of 5Under Pocket Change (in Just Math)
Posted on 2013-07-30 (5 Comments)
re: computer solution - the program by Charlie (2013-07-30 16:24:39)
Solution computer solution by Charlie (2013-07-30 16:23:03)
re: Solution by Charlie (2013-07-30 16:17:16)
Difficulty: 3 of 5Under Maximizing sum (in Numbers)
Posted on 2013-07-29 (1 Comments)
Solution computer assisted solution by Charlie (2013-07-29 17:36:08)
Difficulty: 1 of 5Under Grid Look (in Sequences)
Posted on 2013-07-29 (1 Comments)
Solution solution by Charlie (2013-07-29 17:16:12)
Difficulty: 3 of 5Under Squarely Sorted (in Numbers)
Posted on 2013-07-27 (4 Comments)
even more generally by Charlie (2013-07-28 09:34:33)
more generally by Charlie (2013-07-27 15:49:06)
Difficulty: 4 of 5Under AMY and ANN (in General)
Posted on 2013-07-26 (5 Comments)
Solution re(2): Correction (PARTIAL SOLUTION) by Charlie (2013-07-28 14:49:42)
Difficulty: 4 of 5Under Casting Out Zeros (in Just Math)
Posted on 2013-07-25 (4 Comments)
Some Thoughts re: good for 11 thru 999 by Charlie (2013-07-26 13:09:00)
Some Thoughts good for 11 thru 999 by Charlie (2013-07-26 13:05:20)
re: Godel strikes again --- 31 and 33 by Charlie (2013-07-26 09:53:15)
Difficulty: 2 of 5Under Weighted Quadrilateral (in Geometry)
Posted on 2013-07-25 (1 Comments)
Solution computer solution by Charlie (2013-07-25 15:57:08)
Difficulty: 3 of 5Under Faulty Card Shuffler (in General)
Posted on 2013-07-24 (10 Comments)
re: ? Solution for any set of subcycles? by Charlie (2013-07-29 10:05:25)
Difficulty: 3 of 5Under Repunits and bases (in Numbers)
Posted on 2013-07-24 (6 Comments)
Question re: Answer: by Charlie (2013-07-24 12:42:29)
Solution computer solution by Charlie (2013-07-24 12:40:09)
Difficulty: 3 of 5Under Locker Unlock (in Just Math)
Posted on 2013-07-23 (4 Comments)
re: opening combination by Charlie (2013-07-23 12:22:02)
Solution computer solution by Charlie (2013-07-23 12:21:01)
Difficulty: 3 of 5Under Square Tetrahedral Dice (in Just Math)
Posted on 2013-07-22 (1 Comments)
Solution computer solution by Charlie (2013-07-22 18:37:13)
Difficulty: 3 of 5Under Equal Vision (in Logic)
Posted on 2013-07-22 (1 Comments)
Solution computer solution by Charlie (2013-07-22 13:31:34)
Difficulty: 3 of 5Under Patchy Problem (in Logic)
Posted on 2013-07-19 (6 Comments)
Solution computer solution by Charlie (2013-07-19 13:15:28)
Difficulty: 2 of 5Under Only one untrue statement (in Logic)
Posted on 2013-07-18 (10 Comments)
re(3): Spoiler by Charlie (2013-07-20 09:46:02)
re: Spoiler by Charlie (2013-07-18 11:12:36)
Difficulty: 3 of 5Under Table Tennis Serve (in Just Math)
Posted on 2013-07-17 (6 Comments)
re: possible outcome by Charlie (2013-07-17 12:51:39)
Solution solution by Charlie (2013-07-17 12:45:38)
Difficulty: 3 of 5Under Taking the Long Shot (in Probability)
Posted on 2013-07-16 (3 Comments)
Solution solution by Charlie (2013-07-16 17:32:16)
Difficulty: 4 of 5Under S.o.d. classification (in Just Math)
Posted on 2013-07-15 (2 Comments)
Solution computer solution (spoiler) by Charlie (2013-07-15 18:40:55)
Difficulty: 3 of 5Under Upside Down LCD Display (in Numbers)
Posted on 2013-07-15 (2 Comments)
Solution solution (spoiler) by Charlie (2013-07-15 12:52:44)
Difficulty: 4 of 5Under Circles & Parabola (in Calculus)
Posted on 2013-07-13 (5 Comments)
Solution computer approximation by Charlie (2013-07-13 17:07:42)
Hints/Tips a start by Charlie (2013-07-13 15:46:14)
Some Thoughts thoughts by Charlie (2013-07-13 13:55:05)
Difficulty: 3 of 5Under Every Die Face (in Probability)
Posted on 2013-07-12 (1 Comments)
Solution solution by Charlie (2013-07-12 17:54:06)
Difficulty: 2 of 5Under How many trains? (in Just Math)
Posted on 2013-07-12 (7 Comments)
re(2): Sanity check (spoiler)=rectification by Charlie (2013-07-13 10:06:37)
re(2): solution by Charlie (2013-07-12 22:17:17)
Solution solution by Charlie (2013-07-12 13:07:46)
Difficulty: 3 of 5Under Factorials AND Powers (in Numbers)
Posted on 2013-07-11 (2 Comments)
Solution solution by Charlie (2013-07-11 17:38:47)
Difficulty: 3 of 5Under It's now out! (in Numbers)
Posted on 2013-07-10 (1 Comments)
Solution computer solutions by Charlie (2013-07-10 12:55:09)
Difficulty: 1 of 5Under Simple Thinking (in Numbers)
Posted on 2013-07-09 (2 Comments)
Solution another solution by Charlie (2013-07-09 12:23:15)
Difficulty: 3 of 5Under Athletic Competition (in Logic)
Posted on 2013-07-08 (1 Comments)
Solution computer solution by Charlie (2013-07-08 19:38:17)
Difficulty: 1 of 5Under The Seventh Power (in Numbers)
Posted on 2013-07-08 (2 Comments)
Solution solution by Charlie (2013-07-08 13:53:23)
Difficulty: 3 of 5Under Queen Placements (in Games)
Posted on 2013-07-05 (3 Comments)
Solution computer solution by Charlie (2013-07-05 19:25:35)
Difficulty: 3 of 5Under One is a sum (in Numbers)
Posted on 2013-07-05 (1 Comments)
Solution computer solution by Charlie (2013-07-07 12:25:57)
Difficulty: 3 of 5Under Mystery Matrix (in Sequences)
Posted on 2013-07-04 (6 Comments)
re(2): could be... by Charlie (2013-07-05 09:56:08)
Solution could be... by Charlie (2013-07-04 12:45:20)
Difficulty: 1 of 5Under 222 (in Word Problems)
Posted on 2013-07-02 (11 Comments)
re(2): No Subject by Charlie (2013-07-02 14:00:04)
re: Et tu, Brutus? by Charlie (2013-07-02 13:59:14)
No Subject by Charlie (2013-07-02 11:37:47)
Difficulty: 2 of 5Under Digital Factorial (in Numbers)
Posted on 2013-07-01 (3 Comments)
Solution solution by Charlie (2013-07-01 14:23:57)
Difficulty: 4 of 5Under My uncle's habits (in Probability)
Posted on 2013-06-28 (4 Comments)
Solution computer-assisted solution by Charlie (2013-06-28 18:57:50)
Difficulty: 3 of 5Under Arrange the Digits (in Just Math)
Posted on 2013-06-28 (2 Comments)
Solution computer method by Charlie (2013-06-28 12:47:53)
Difficulty: 3 of 5Under Hound Path (in General)
Posted on 2013-06-27 (2 Comments)
Solution solution by Charlie (2013-06-27 12:54:29)
Difficulty: 3 of 5Under Winning Number (in Tricks)
Posted on 2013-06-26 (4 Comments)
Solution explanation (spoiler) by Charlie (2013-06-26 13:58:07)
Difficulty: 2 of 5Under Euler erred (in Just Math)
Posted on 2013-06-25 (1 Comments)
Solution computer solution by Charlie (2013-06-25 12:55:38)
Difficulty: 3 of 5Under Clockwork (in Logic)
Posted on 2013-06-24 (1 Comments)
Solution computer solution by Charlie (2013-06-24 17:35:28)
Difficulty: 2 of 5Under Infinite Product (in Numbers)
Posted on 2013-06-24 (3 Comments)
Solution computer exploration (spoiler) by Charlie (2013-06-24 12:29:29)
Difficulty: 3 of 5Under PRIMY inequality (in Just Math)
Posted on 2013-06-22 (1 Comments)
Solution computer assisted solution by Charlie (2013-06-22 16:06:17)
Difficulty: 3 of 5Under Words, words, numbers (in Word Problems)
Posted on 2013-06-21 (2 Comments)
Solution computer findings by Charlie (2013-06-21 18:25:47)
Difficulty: 3 of 5Under Three Bricklayers (in Just Math)
Posted on 2013-06-21 (4 Comments)
Some Thoughts all the reasonable solutions (spoiler) by Charlie (2013-06-21 13:13:57)
Solution computer solution by Charlie (2013-06-21 12:59:55)
Difficulty: 3 of 5Under Shiny Numbers (in Just Math)
Posted on 2013-06-20 (6 Comments)
based on a pattern by Charlie (2013-06-21 01:22:27)
Difficulty: 2 of 5Under Card Deal (in Logic)
Posted on 2013-06-20 (3 Comments)
Solution re: What if...SPOILER -- general solution and Ady's question by Charlie (2013-06-20 11:16:51)
Difficulty: 3 of 5Under Sliding Coin puzzle (in General)
Posted on 2013-06-19 (3 Comments)
Solution solution by Charlie (2013-06-19 14:02:06)
Difficulty: 3 of 5Under A Black and White Issue (in Just Math)
Posted on 2013-06-18 (3 Comments)
Solution solution by Charlie (2013-06-18 16:02:39)
Difficulty: 3 of 5Under Family Occupations (in Logic)
Posted on 2013-06-17 (5 Comments)
re: Analytical solution (spoiler) by Charlie (2013-06-19 07:41:46)
Solution computer solution by Charlie (2013-06-17 18:23:07)
Difficulty: 2 of 5Under Jumbo Digits (in Just Math)
Posted on 2013-06-14 (1 Comments)
Solution No Subject by Charlie (2013-06-14 12:53:06)
Difficulty: 3 of 5Under Coin Toss (in Games)
Posted on 2013-06-13 (4 Comments)
Solution solution by Charlie (2013-06-13 17:52:15)
Difficulty: 3 of 5Under Vera's Date (in Logic)
Posted on 2013-06-12 (10 Comments)
Solution re(2): computer solution by Charlie (2013-06-13 10:05:42)
re: spoiler by Charlie (2013-06-13 09:54:59)
re: spoiler by Charlie (2013-06-12 15:27:07)
Solution computer solution by Charlie (2013-06-12 15:23:43)
Difficulty: 3 of 5Under Mail Delivery Muse (in Logic)
Posted on 2013-06-11 (3 Comments)
Solution computer solution by Charlie (2013-06-11 17:24:10)
Difficulty: 4 of 5Under Lion and Tamer (in Logic)
Posted on 2013-06-10 (7 Comments)
Some Thoughts re: Numeric integration: it takes a while to get close -- continued by Charlie (2013-06-11 13:43:28)
Some Thoughts Numeric integration: it takes a while to get close by Charlie (2013-06-11 13:42:06)
Solution solution by Charlie (2013-06-10 21:20:19)
Difficulty: 2 of 5Under Adjacent Square Sum II (in Just Math)
Posted on 2013-06-10 (5 Comments)
Solution No Subject by Charlie (2013-06-10 13:37:54)
Difficulty: 4 of 5Under Cubic Equation (in Just Math)
Posted on 2013-06-09 (13 Comments)
re(4): an open letter to Charlie by Charlie (2013-06-13 18:01:36)
re(2): an open letter to Charlie by Charlie (2013-06-12 15:29:31)
re: an open letter to Charlie by Charlie (2013-06-10 21:35:38)
Some Thoughts re(3): A second all-positive solution (spoilers) by Charlie (2013-06-10 21:26:00)
re(2): A second all-positive solution (spoilers) by Charlie (2013-06-10 15:28:54)
Some Thoughts A second all-positive solution (spoilers) by Charlie (2013-06-09 23:38:19)
Some Thoughts preliminary computer results (spoiler) by Charlie (2013-06-09 15:01:35)
Difficulty: 3 of 5Under Place Perception (in Logic)
Posted on 2013-06-07 (9 Comments)
Solution computer assisted solution by Charlie (2013-06-07 17:33:31)
Difficulty: 3 of 5Under Divisibility and Digit Sum (in Just Math)
Posted on 2013-06-07 (8 Comments)
re: No Subject by Charlie (2013-06-07 13:42:49)
re: No Subject -- verification (spoiler) by Charlie (2013-06-07 13:38:53)
Solution solution by Charlie (2013-06-07 12:06:46)
Difficulty: 3 of 5Under Thief Visualization (in Liars and Knights)
Posted on 2013-06-05 (1 Comments)
Solution computer and some added logic by Charlie (2013-06-05 12:55:33)
Difficulty: 3 of 5Under Eight Word Fill (in Word Problems)
Posted on 2013-06-04 (10 Comments)
Some Thoughts My bug -- plus two more solutions by Charlie (2013-06-05 08:39:58)
re: Awkward Letters by Charlie (2013-06-05 01:50:02)
Some Thoughts computer attempts by Charlie (2013-06-04 17:19:05)
Difficulty: 3 of 5Under William's house-number (in Logic)
Posted on 2013-06-04 (5 Comments)
Solution computer-assisted solution by Charlie (2013-06-04 11:40:43)
Difficulty: 3 of 5Under Mean Distance Two Points (in Shapes)
Posted on 2013-06-01 (9 Comments)
re(2): Part 2 in two different ways. by Charlie (2013-06-02 11:05:45)
Some Thoughts re: Part 2 in two different ways. by Charlie (2013-06-02 10:43:12)
Some Thoughts Numerically by Charlie (2013-06-01 11:36:38)
Difficulty: 3 of 5Under Q: What is this sum? (in Numbers)
Posted on 2013-05-31 (4 Comments)
Solution re: hint (solution--spoiler) by Charlie (2013-06-01 10:24:10)
Difficulty: 2 of 5Under Five Mileposts (in Just Math)
Posted on 2013-05-31 (26 Comments)
Solution solution by Charlie (2013-05-31 12:20:41)
Difficulty: 3 of 5Under Integer Pairs (in Just Math)
Posted on 2013-05-30 (2 Comments)
Some Thoughts computer exploration by Charlie (2013-05-30 17:43:21)
Difficulty: 3 of 5Under You & you (in Word Problems)
Posted on 2013-05-30 (6 Comments)
re: Plurals, plurals, plurals by Charlie (2013-05-31 12:46:13)
Solution words by Charlie (2013-05-31 09:54:59)
Difficulty: 4 of 5Under UVWXYZ (in Just Math)
Posted on 2013-05-27 (12 Comments)
re: No Subject by Charlie (2013-05-28 10:47:01)
Solution re(2): My solution (computer assisted) by Charlie (2013-05-28 10:22:16)
Solution My solution (computer assisted) by Charlie (2013-05-27 17:27:28)
Difficulty: 4 of 5Under Crossnumber II (in General)
Posted on 2013-05-27 (2 Comments)
Solution solution by Charlie (2013-05-27 14:13:27)
Hints/Tips helpful table by Charlie (2013-05-27 11:01:48)
Difficulty: 3 of 5Under Productive Numbers (in Just Math)
Posted on 2013-05-26 (6 Comments)
Solution computer solution: the long list (spoilers) by Charlie (2013-05-26 14:58:35)
Some Thoughts re: WITH ZERO (more spoilers) by Charlie (2013-05-26 14:50:31)
Some Thoughts re: spoiler #1 by Charlie (2013-05-26 12:48:16)
Difficulty: 3 of 5Under Mice Supplements (in General)
Posted on 2013-05-22 (7 Comments)
Solution computer solution by Charlie (2013-05-22 17:32:03)
Difficulty: 3 of 5Under High Scorer (in General)
Posted on 2013-05-21 (11 Comments)
re: Conflict? by Charlie (2013-05-21 23:14:39)
re: 24+22+13+23+19 _ by Charlie (2013-05-21 23:10:59)
Solution computer solution by Charlie (2013-05-21 17:15:21)
Difficulty: 2 of 5Under Simple expression but difficult answer (in Just Math)
Posted on 2013-05-21 (2 Comments)
Some Thoughts numerically (spoiler) by Charlie (2013-05-21 13:28:37)
Difficulty: 3 of 5Under Compare two problems (in Just Math)
Posted on 2013-05-20 (3 Comments)
re: Initially by Charlie (2013-05-21 09:48:55)
Solution computer solutions by Charlie (2013-05-20 17:42:12)
Difficulty: 2 of 5Under Adjacent Square Sum (in Just Math)
Posted on 2013-05-20 (5 Comments)
Solution re: P 'n P and then ... -- recursive method added by Charlie (2013-05-21 09:54:58)
Difficulty: 3 of 5Under It is simpler than you think (in Just Math)
Posted on 2013-05-18 (1 Comments)
Solution must be the solutions by Charlie (2013-05-19 09:39:08)
Difficulty: 2 of 5Under Squares and Cubes II (in Numbers)
Posted on 2013-05-17 (2 Comments)
Solution solution by Charlie (2013-05-17 12:09:37)
Difficulty: 2 of 5Under What's wrong with him? (in Tricks)
Posted on 2013-05-16 (6 Comments)
re(2): only part of the explanation by Charlie (2013-08-04 10:26:18)
Some Thoughts only part of the explanation by Charlie (2013-05-17 12:23:15)
Difficulty: 3 of 5Under Paint Perception (in Logic)
Posted on 2013-05-15 (3 Comments)
Solution P'n'P solution by Charlie (2013-05-15 14:59:56)
Difficulty: 3 of 5Under Toast Schedule (in General)
Posted on 2013-05-13 (3 Comments)
Solution solution by Charlie (2013-05-13 13:35:00)
Difficulty: 4 of 5Under Positive Integer, Odd Digits, Divisibility (in Just Math)
Posted on 2013-05-12 (7 Comments)
Hints/Tips re: Trials by Charlie (2013-05-13 08:55:27)
Difficulty: 3 of 5Under Tower Travail (in Just Math)
Posted on 2013-05-10 (2 Comments)
Solution computer solution by Charlie (2013-05-10 17:25:51)
Difficulty: 3 of 5Under Proverb Converse (in Word Problems)
Posted on 2013-05-09 (7 Comments)
Some Thoughts re: And a few more by Charlie (2013-05-11 00:22:56)
Some Thoughts only a few by Charlie (2013-05-09 11:50:45)
Difficulty: 3 of 5Under Odd steps (in Numbers)
Posted on 2013-05-08 (1 Comments)
Solution computer solution by Charlie (2013-05-08 17:40:00)
Difficulty: 3 of 5Under Roman Resolve (in Sequences)
Posted on 2013-05-08 (2 Comments)
list for verification by Charlie (2013-05-08 13:05:03)
Solution computer solution by Charlie (2013-05-08 12:50:21)
Difficulty: 3 of 5Under Numerical Logic (in Logic)
Posted on 2013-05-06 (1 Comments)
Solution First pencil and paper, then computer by Charlie (2013-05-06 17:10:00)
Difficulty: 3 of 5Under Prime Fibonacci numbers (in Numbers)
Posted on 2013-05-03 (3 Comments)
re(2): Exploration by Charlie (2013-05-04 11:20:35)
Some Thoughts Exploration by Charlie (2013-05-03 17:09:33)
Difficulty: 2 of 5Under Marriage Muse (in Logic)
Posted on 2013-05-03 (4 Comments)
Solution spoiler by Charlie (2013-05-03 12:39:18)
Difficulty: 3 of 5Under Fibo and GCD (in Numbers)
Posted on 2013-05-02 (2 Comments)
Solution re: a table (spoiler) by Charlie (2013-05-03 14:38:22)
Some Thoughts a table by Charlie (2013-05-03 00:25:28)
Difficulty: 2 of 5Under Colorful Win (in Games)
Posted on 2013-05-02 (4 Comments)
re: Move-counter move by Charlie (2013-05-02 14:41:26)
Difficulty: 3 of 5Under Generalize (in Numbers)
Posted on 2013-05-01 (5 Comments)
Solution re: part 1 solution, plus examples of M(x,y) by Charlie (2013-05-01 18:12:47)
Some Thoughts part 1 solution, plus examples of M(x,y) by Charlie (2013-05-01 18:00:54)
Difficulty: 2 of 5Under Christmas Carol Conclusion (in Word Problems)
Posted on 2013-05-01 (3 Comments)
Solution solution by Charlie (2013-05-01 16:53:16)
Difficulty: 3 of 5Under Consecutive Cuts (in Word Problems)
Posted on 2013-04-30 (6 Comments)
re: Why, oh why? by Charlie (2013-05-02 10:14:08)
re: Never quite there by Charlie (2013-05-01 09:58:34)
Solution computer solution by Charlie (2013-04-30 16:09:22)
Difficulty: 3 of 5Under Festival and Games (in Logic)
Posted on 2013-04-29 (2 Comments)
Solution computer solution by Charlie (2013-04-29 18:18:57)
Difficulty: 2 of 5Under Three in, one out (in Just Math)
Posted on 2013-04-29 (5 Comments)
Solution possible solutions? by Charlie (2013-04-29 14:41:50)
Difficulty: 3 of 5Under Dark Divisibility (in Just Math)
Posted on 2013-04-27 (21 Comments)
re: Infinite examples, no proof yet. by Charlie (2013-04-29 01:29:25)
Difficulty: 3 of 5Under The Seven Primes (in Just Math)
Posted on 2013-04-26 (2 Comments)
Solution computer solution by Charlie (2013-04-26 17:47:32)
Difficulty: 2 of 5Under Hidden Word (in Word Problems)
Posted on 2013-04-26 (5 Comments)
Solution computer solution by Charlie (2013-04-26 12:45:40)
Difficulty: 3 of 5Under Professor Perception (in Logic)
Posted on 2013-04-25 (9 Comments)
re(2): Corrected analytical solution by Charlie (2013-04-29 01:16:54)
re: Reveal your bias (analytical spoiler) by Charlie (2013-04-26 14:24:22)
Solution computer solution by Charlie (2013-04-25 21:43:36)
Difficulty: 4 of 5Under Battleships (in Logic)
Posted on 2013-04-24 (6 Comments)
Solution computer solutions by Charlie (2013-04-24 19:35:21)
re: What am I missing again? by Charlie (2013-04-24 19:34:08)
Difficulty: 2 of 5Under Winning Chance (in Probability)
Posted on 2013-04-24 (3 Comments)
re: Solution by Charlie (2013-04-24 12:24:18)
Solution solution by Charlie (2013-04-24 12:22:59)
Difficulty: 3 of 5Under Circular Billiards Table (in Geometry)
Posted on 2013-04-23 (6 Comments)
Solution re: Playing with Geometers' Sketchpad -- a method by Charlie (2013-04-24 00:40:10)
Playing with Geometers' Sketchpad by Charlie (2013-04-23 23:21:21)
Difficulty: 3 of 5Under 2012 sum Digit (in Just Math)
Posted on 2013-04-23 (4 Comments)
Solution semi-analytic and fully automated solutions by Charlie (2013-04-23 12:25:49)
Difficulty: 1 of 5Under How much and why ? (in Logic)
Posted on 2013-04-22 (2 Comments)
Solution two possible answers by Charlie (2013-04-22 12:16:12)
Difficulty: 3 of 5Under Poker Precept (in Logic)
Posted on 2013-04-19 (4 Comments)
Solution the computer method by Charlie (2013-04-19 13:06:57)
Difficulty: 3 of 5Under Minus Cube (in Games)
Posted on 2013-04-18 (3 Comments)
Solution parts 2 and 3 by Charlie (2013-04-18 17:51:54)
Solution Part 1 computer solution by Charlie (2013-04-18 16:39:44)
Difficulty: 3 of 5Under Prime Mean (in Just Math)
Posted on 2013-04-17 (5 Comments)
Solution the computer method by Charlie (2013-04-17 12:37:57)
Difficulty: 3 of 5Under Antonym Ascertainment (in Word Problems)
Posted on 2013-04-16 (4 Comments)
Some Thoughts filling in number 1 via computer by Charlie (2013-04-16 15:53:36)
Difficulty: 3 of 5Under Singleton Settlement (in Logic)
Posted on 2013-04-16 (2 Comments)
Solution solution by Charlie (2013-04-16 11:45:47)
Difficulty: 3 of 5Under Close neighbours (in Just Math)
Posted on 2013-04-15 (1 Comments)
Solution solution by Charlie (2013-04-15 16:28:18)
Difficulty: 3 of 5Under Equilateral Crease (in Shapes)
Posted on 2013-04-13 (4 Comments)
Some Thoughts Numeric values from Geometers' Sketchpad by Charlie (2013-04-13 14:41:49)
Difficulty: 2 of 5Under Powered Pair (in Just Math)
Posted on 2013-04-12 (2 Comments)
Solution computer solution by Charlie (2013-04-12 16:07:42)
Difficulty: 2 of 5Under As low as possible (in Numbers)
Posted on 2013-04-12 (6 Comments)
Solution re: Analytical solution (spoiler) by Charlie (2013-04-12 14:04:01)
re: Analytical solution (spoiler) by Charlie (2013-04-12 13:33:14)
Solution pretty pictures by Charlie (2013-04-12 12:40:29)
Difficulty: 2 of 5Under Population of Funkytown (in Logic)
Posted on 2013-04-10 (5 Comments)
re: Answer by Charlie (2013-04-10 12:35:36)
Difficulty: 3 of 5Under Pass the beer (in Probability)
Posted on 2013-04-09 (8 Comments)
re(6): computer solution by Charlie (2013-04-11 09:44:12)
re(4): computer solution by Charlie (2013-04-11 02:00:12)
re(2): computer solution by Charlie (2013-04-10 12:26:20)
Solution computer solution by Charlie (2013-04-09 18:34:01)
Difficulty: 3 of 5Under Non-arithmetic Triplets (in General)
Posted on 2013-04-08 (9 Comments)
re(4): Counting Up,,,,Why not up and down? by Charlie (2013-04-09 01:52:20)
re(2): Counting Up by Charlie (2013-04-08 19:56:32)
Solution computer solution--includes the symmetric opposite by Charlie (2013-04-08 16:03:25)
Difficulty: 3 of 5Under Powers often in other bases. (in Numbers)
Posted on 2013-04-07 (3 Comments)
Hints/Tips further hint by Charlie (2013-04-07 12:46:19)
Hints/Tips Tables: no proof except for 2,3,4,...,67 by Charlie (2013-04-07 12:18:07)
Difficulty: 3 of 5Under Neat Network II (in General)
Posted on 2013-04-05 (4 Comments)
Solution assuming there's no other topological configuration by Charlie (2013-04-05 15:46:00)
Difficulty: 3 of 5Under Temperature Temperament II (in Science)
Posted on 2013-04-04 (2 Comments)
Solution solution by Charlie (2013-04-04 14:12:22)
Difficulty: 3 of 5Under Rearranged Resolution (in Word Problems)
Posted on 2013-04-03 (7 Comments)
Solution computer solution by Charlie (2013-04-03 17:18:42)
Difficulty: 3 of 5Under Covert Quantity (in Logic)
Posted on 2013-04-02 (4 Comments)
Solution computer solution by Charlie (2013-04-02 16:01:17)
Difficulty: 2 of 5Under Sine gives pi? (in Just Math)
Posted on 2013-04-02 (2 Comments)
Solution Solution by Charlie (2013-04-02 11:08:08)
Difficulty: 1 of 5Under Finding Average (in Logic)
Posted on 2013-04-01 (9 Comments)
re: D1 says ultimate simplicity. by Charlie (2013-04-02 08:39:29)
re: One solution (and a simple variation) by Charlie (2013-04-01 11:42:39)
Difficulty: 3 of 5Under Dangerous Expression for Rationals (in Numbers)
Posted on 2013-03-31 (5 Comments)
re(3): Question? by Charlie (2013-04-05 09:28:17)
re: Question? by Charlie (2013-04-05 00:51:40)
Difficulty: 3 of 5Under Pentagon Ratio (in Shapes)
Posted on 2013-03-30 (2 Comments)
Solution Geometers' Sketchpad says... by Charlie (2013-03-30 12:59:56)
Difficulty: 4 of 5Under D is harder than C (in Just Math)
Posted on 2013-03-29 (11 Comments)
re(2): political reply to b by Charlie (2013-03-30 13:07:37)
re(4): political reply to b by Charlie (2013-03-30 13:05:51)
re(2): political reply to b by Charlie (2013-03-30 09:13:43)
Solution computer assisted solution by Charlie (2013-03-29 17:13:53)
Some Thoughts political reply to b by Charlie (2013-03-29 13:58:14)
Difficulty: 4 of 5Under Analyzing LOTTO (in Numbers)
Posted on 2013-03-28 (6 Comments)
re: reconcider c by Charlie (2013-03-29 09:07:22)
Solution No Subject by Charlie (2013-03-28 19:14:21)
Difficulty: 2 of 5Under Irrational ^ Irrational = Rational (in Numbers)
Posted on 2013-03-27 (3 Comments)
Solution the immediately obvious by Charlie (2013-03-27 08:55:47)
Difficulty: 4 of 5Under Bartender to his apprentice: (in Numbers)
Posted on 2013-03-26 (5 Comments)
re: solutions by Charlie (2013-03-27 09:47:53)
Solution re: No real spoiler (now a spoiler) by Charlie (2013-03-26 22:49:13)
Difficulty: 3 of 5Under Mileage Muse (in Numbers)
Posted on 2013-03-26 (7 Comments)
re: Part 1 with no reset by Charlie (2013-03-26 14:39:54)
Solution computer solution by Charlie (2013-03-26 14:33:03)
Difficulty: 3 of 5Under Parabolic discovery (in Just Math)
Posted on 2013-03-25 (1 Comments)
Solution answer by Charlie (2013-03-25 16:53:46)
Difficulty: 3 of 5Under Fiancé Resolution (in Liars and Knights)
Posted on 2013-03-25 (7 Comments)
re(2): computer solution by Charlie (2013-03-25 18:39:32)
re: 2 POSSIBLE ANSWERS -spoiler by Charlie (2013-03-25 11:45:30)
Solution computer solution by Charlie (2013-03-25 11:29:29)
Difficulty: 3 of 5Under Conga Primes (in Numbers)
Posted on 2013-03-23 (11 Comments)
re(2): more results, but still no part 2 soln by Charlie (2013-03-27 11:29:40)
Some Thoughts still no luck on part 2 by Charlie (2013-03-26 14:21:36)
Some Thoughts more results, but still no part 2 soln by Charlie (2013-03-26 09:25:24)
Some Thoughts part 1b. (spoiler) by Charlie (2013-03-26 08:46:42)
Some Thoughts part 1a (spoiler) by Charlie (2013-03-26 08:35:08)
Difficulty: 3 of 5Under Murderous Performer (in Logic)
Posted on 2013-03-22 (3 Comments)
Solution the computer method by Charlie (2013-03-22 15:51:12)
Difficulty: 3 of 5Under So many ways.... (in Numbers)
Posted on 2013-03-21 (3 Comments)
Solution solution by Charlie (2013-03-21 16:11:36)
Difficulty: 3 of 5Under Age Ascertainment III (in Logic)
Posted on 2013-03-19 (2 Comments)
Solution computer solution by Charlie (2013-03-19 14:36:14)
Difficulty: 4 of 5Under Consecutively Divisible (in Just Math)
Posted on 2013-03-18 (3 Comments)
Solution 5/6 of computer solution by Charlie (2013-03-18 15:05:17)
Difficulty: 4 of 5Under Goldbach revisited (in Numbers)
Posted on 2013-03-15 (2 Comments)
Solution computer aided solutions by Charlie (2013-03-15 15:43:03)
Difficulty: 3 of 5Under Code synonyms (in Word Problems)
Posted on 2013-03-14 (1 Comments)
Solution computer aided solution by Charlie (2013-03-14 18:18:42)
Difficulty: 3 of 5Under Ten Words (5) (in Word Problems)
Posted on 2013-03-14 (2 Comments)
Solution solution by Charlie (2013-03-14 13:24:33)
Difficulty: 2 of 5Under All but one (in Numbers)
Posted on 2013-03-13 (2 Comments)
Some Thoughts odd single-digit values for n under a billion by Charlie (2013-03-14 00:10:02)
Difficulty: 4 of 5Under UN cargo (in Numbers)
Posted on 2013-03-13 (9 Comments)
Some Thoughts first few by Charlie (2013-03-14 00:04:46)
Difficulty: 3 of 5Under Ornament Orientation (in Liars and Knights)
Posted on 2013-03-12 (3 Comments)
Solution solution by Charlie (2013-03-12 14:26:20)
Difficulty: 3 of 5Under Strange Equation (in Just Math)
Posted on 2013-03-11 (10 Comments)
Some Thoughts some of the more interesting results of the concatenation interpretation by Charlie (2013-03-17 13:17:20)
Some Thoughts outside the box by Charlie (2013-03-17 12:07:31)
Some Thoughts computer exploration by Charlie (2013-03-16 08:08:55)
Difficulty: 3 of 5Under Recondite Route (in Logic)
Posted on 2013-03-11 (3 Comments)
Solution computer solution by Charlie (2013-03-11 12:00:53)
Difficulty: 3 of 5Under Three neighbours (in Numbers)
Posted on 2013-03-08 (3 Comments)
re: an answer by Charlie (2013-03-08 21:38:46)
Difficulty: 3 of 5Under A blue taxi II (in Probability)
Posted on 2013-03-08 (4 Comments)
re: Solution- independent of n by Charlie (2013-03-13 08:37:16)
Solution solution by Charlie (2013-03-08 13:21:39)
Difficulty: 3 of 5Under BINGO! (in Probability)
Posted on 2013-03-07 (4 Comments)
Solution different program -- agrees with previous results by Charlie (2013-03-08 12:03:14)
Some Thoughts Simulation results by Charlie (2013-03-07 22:42:19)
Difficulty: 1 of 5Under True Geometry (in Numbers)
Posted on 2013-03-07 (2 Comments)
Hints/Tips hint by Charlie (2013-03-09 12:09:19)
Difficulty: 3 of 5Under Homophones Misrepresented (in Word Problems)
Posted on 2013-03-06 (3 Comments)
re: No Subject by Charlie (2013-03-07 10:44:48)
Difficulty: 2 of 5Under Temperature Temperament (in Just Math)
Posted on 2013-03-06 (3 Comments)
Solution program for solution (spoiler) by Charlie (2013-03-06 11:34:08)
Difficulty: 3 of 5Under Cell Choices (in General)
Posted on 2013-03-05 (4 Comments)
Solution computer solution by Charlie (2013-03-05 15:42:23)
Difficulty: 2 of 5Under 4 sixes (in Numbers)
Posted on 2013-03-05 (2 Comments)
Solution computer solution by Charlie (2013-03-05 13:56:51)
Difficulty: 3 of 5Under Ceiling and Floor Formulation (in Algorithms)
Posted on 2013-03-04 (6 Comments)
re: Solution? by Charlie (2013-03-04 15:40:27)
Solution two ways of looking at the problem by Charlie (2013-03-04 15:27:36)
Difficulty: 2 of 5Under Math spelling (in Word Problems)
Posted on 2013-03-04 (9 Comments)
Solution computer solutions by Charlie (2013-03-04 12:11:03)
Difficulty: 3 of 5Under Digit permutation (in Numbers)
Posted on 2013-03-03 (3 Comments)
Solution computer solution by Charlie (2013-03-03 12:17:56)
Difficulty: 3 of 5Under Intriguing Integral Illation (in Calculus)
Posted on 2013-03-02 (6 Comments)
Some Thoughts re: Just guessing -- numerical integration comparison by Charlie (2013-03-02 14:49:35)
Difficulty: 2 of 5Under Trespassing (in Cryptography)
Posted on 2013-03-01 (1 Comments)
Solution computer solution by Charlie (2013-03-01 13:11:53)
Difficulty: 3 of 5Under Quarting the cube (in Just Math)
Posted on 2013-02-28 (6 Comments)
Some Thoughts computer exploration shows likely true -- no proof by Charlie (2013-02-28 16:51:58)
Difficulty: 3 of 5Under Geometric Generalization (in Probability)
Posted on 2013-02-28 (6 Comments)
re: Corrected solution by Charlie (2013-02-28 12:50:23)
Solution computer solution by Charlie (2013-02-28 12:46:10)
Difficulty: 3 of 5Under Summing Ones (in Numbers)
Posted on 2013-02-27 (4 Comments)
re: No Subject (spoiler) by Charlie (2013-02-27 13:27:15)
Solution solution by Charlie (2013-02-27 13:23:06)
Difficulty: 4 of 5Under Underground occupation (in Cryptography)
Posted on 2013-02-26 (4 Comments)
re(3): Observations....H I N T/ partial spoiler (full spoiler) by Charlie (2013-02-27 09:58:04)
Difficulty: 3 of 5Under Liar Lock (in Liars and Knights)
Posted on 2013-02-26 (5 Comments)
Solution computer solution by Charlie (2013-02-26 13:34:37)
Difficulty: 5 of 5Under Prime source (in Numbers)
Posted on 2013-02-25 (1 Comments)
Solution computer solution by Charlie (2013-02-25 20:13:26)
Difficulty: 3 of 5Under Seating Singularity (in Logic)
Posted on 2013-02-25 (1 Comments)
Solution computer solution by Charlie (2013-02-25 14:55:08)
Difficulty: 2 of 5Under Magical Magician (in Numbers)
Posted on 2013-02-23 (6 Comments)
Solution a solution by Charlie (2013-02-23 16:33:19)
Difficulty: 3 of 5Under Point to 2013 (2) (in Just Math)
Posted on 2013-02-22 (2 Comments)
Solution computer solution by Charlie (2013-02-22 14:06:08)
Difficulty: 3 of 5Under Crossanagram (in Word Problems)
Posted on 2013-02-21 (1 Comments)
Solution PnP solution by Charlie (2013-02-21 18:10:48)
Difficulty: 3 of 5Under Commemorative triangles (in Sequences)
Posted on 2013-02-20 (1 Comments)
Solution computer solution but no proof by Charlie (2013-02-20 18:13:33)
Difficulty: 2 of 5Under Not represented (in Numbers)
Posted on 2013-02-20 (4 Comments)
re: Initially Analytically by Charlie (2013-02-20 19:45:07)
Difficulty: 3 of 5Under Reflected Halves (in Word Problems)
Posted on 2013-02-19 (5 Comments)
re(3): computer exploration by Charlie (2013-02-22 21:40:38)
re: computer exploration by Charlie (2013-02-19 18:50:26)
Solution computer exploration by Charlie (2013-02-19 18:41:14)
Difficulty: 2 of 5Under Purely prime (in Just Math)
Posted on 2013-02-19 (3 Comments)
re: Just the proof (spoiler) by Charlie (2013-02-19 18:39:18)
Difficulty: 3 of 5Under Quiz Results II (in Logic)
Posted on 2013-02-18 (1 Comments)
Solution computer solution by Charlie (2013-02-18 18:06:03)
Difficulty: 3 of 5Under Primed to Square (in Just Math)
Posted on 2013-02-15 (3 Comments)
Solution computer exploration (probable spoiler) by Charlie (2013-02-15 18:24:00)
Difficulty: 3 of 5Under Extra Egyptians (in Just Math)
Posted on 2013-02-14 (1 Comments)
Solution Most of a solution; I think this is what is wanted by Charlie (2013-02-14 17:03:00)
Difficulty: 3 of 5Under Four Elements (in Numbers)
Posted on 2013-02-14 (1 Comments)
Solution In the absence of a PnP solution (spoiler). by Charlie (2013-02-15 14:33:37)
Difficulty: 3 of 5Under Triangle Perimeters (in Shapes)
Posted on 2013-02-13 (6 Comments)
re(3): Resist by Charlie (2013-02-14 00:23:33)
Difficulty: 3 of 5Under Finding numbers (in Numbers)
Posted on 2013-02-12 (2 Comments)
Solution computer solution by Charlie (2013-02-12 17:49:03)
Difficulty: 3 of 5Under Commemorations 2 (in Sequences)
Posted on 2013-02-11 (1 Comments)
Solution I can't solve this without a computer (spoiler) by Charlie (2013-02-11 18:54:33)
Difficulty: 3 of 5Under Egyptian Number (in Just Math)
Posted on 2013-02-09 (5 Comments)
Solution re: Lucky numbers? by Charlie (2013-02-11 11:09:19)
re: Possible approach by Charlie (2013-02-10 09:55:52)
Difficulty: 3 of 5Under Rocking digits (in Numbers)
Posted on 2013-02-08 (3 Comments)
Solution solution by Charlie (2013-02-08 17:10:54)
Difficulty: 2 of 5Under Sound Scrutiny (in Word Problems)
Posted on 2013-02-08 (4 Comments)
re: Avoiding the computer offer by Charlie (2013-02-09 00:24:55)
Solution yes, there is a computer method (spoiler) by Charlie (2013-02-08 14:49:25)
Difficulty: 3 of 5Under Musket Mettle (in Logic)
Posted on 2013-02-07 (2 Comments)
Solution computer solution by Charlie (2013-02-07 15:08:32)
Difficulty: 3 of 5Under No Soiree (in Numbers)
Posted on 2013-02-07 (9 Comments)
Solution re: In Shame by Charlie (2013-02-07 21:05:27)
attempt at computer solution by Charlie (2013-02-07 13:46:11)
Difficulty: 3 of 5Under Commemorations (in Weights and Scales)
Posted on 2013-02-06 (7 Comments)
re: Done. -spoiler by Charlie (2013-02-06 17:06:41)
Solution computer solution by Charlie (2013-02-06 17:01:18)
Difficulty: 3 of 5Under A false claim (in Numbers)
Posted on 2013-02-05 (3 Comments)
Solution computer solution by Charlie (2013-02-05 15:47:15)
Difficulty: 3 of 5Under Celsius = 1/Fahrenheit (in Just Math)
Posted on 2013-02-05 (1 Comments)
Solution computer solution by Charlie (2013-02-05 13:56:06)
Difficulty: 3 of 5Under Respectively Divisible (in Just Math)
Posted on 2013-02-04 (2 Comments)
Solution computer solution by Charlie (2013-02-04 16:34:33)
Difficulty: 2 of 5Under Confused? (in Riddles)
Posted on 2013-02-04 (3 Comments)
Solution actual solution (spoiler) by Charlie (2013-02-04 13:20:31)
re: Answer by Charlie (2013-02-04 13:18:46)
Difficulty: 1 of 5Under Age Ascertainment II (in Logic)
Posted on 2013-02-01 (4 Comments)
re: all solutions by Charlie (2013-02-01 14:14:39)
Difficulty: 3 of 5Under Arrangements count (in Just Math)
Posted on 2013-01-31 (2 Comments)
Solution solution method by Charlie (2013-01-31 19:37:53)
Difficulty: 3 of 5Under Cubing the square (in Just Math)
Posted on 2013-01-30 (8 Comments)
Solution computer solution by Charlie (2013-01-30 15:56:53)
Difficulty: 2 of 5Under Planetary Perception (in Word Problems)
Posted on 2013-01-30 (14 Comments)
re(2): After 8 ....How does this text relate to planets? by Charlie (2013-02-02 01:32:50)
re(2): Last one.....NOW -- and three more by Charlie (2013-01-31 02:47:10)
Difficulty: 3 of 5Under Group Endeavor (in General)
Posted on 2013-01-29 (8 Comments)
re: POSSIBLE INTERPRETATION by Charlie (2013-01-30 13:33:59)
re(2): additional possibilities...LIST THEM by Charlie (2013-01-30 10:44:07)
re: additional possibilities...LIST THEM by Charlie (2013-01-30 09:49:51)
Difficulty: 3 of 5Under The 73rd digit (in Numbers)
Posted on 2013-01-29 (3 Comments)
Solution computer solution by Charlie (2013-01-29 12:07:59)
Difficulty: 3 of 5Under Below 5K (in Just Math)
Posted on 2013-01-28 (2 Comments)
re: computer solution by Charlie (2013-01-28 17:55:49)
Solution computer solution by Charlie (2013-01-28 15:33:51)
Difficulty: 3 of 5Under Sum of real Roots (in Just Math)
Posted on 2013-01-27 (6 Comments)
re: Agreement by Charlie (2013-01-28 14:08:43)
Difficulty: 3 of 5Under Cute Divisibility (in Numbers)
Posted on 2013-01-26 (2 Comments)
Some Thoughts thoughts by Charlie (2013-01-27 10:27:49)
Difficulty: 3 of 5Under Pandigital? (in Numbers)
Posted on 2013-01-25 (4 Comments)
re(2): computer solution by Charlie (2013-01-26 10:27:44)
Solution computer solution by Charlie (2013-01-25 16:29:24)
Difficulty: 3 of 5Under Add 1, Get Harmonic (in Sequences)
Posted on 2013-01-25 (2 Comments)
Some Thoughts computer exploration by Charlie (2013-01-25 12:34:46)
Difficulty: 2 of 5Under Greetings from P (in Sequences)
Posted on 2013-01-24 (5 Comments)
re: P is for what? by Charlie (2013-01-24 19:36:43)
what if... by Charlie (2013-01-24 15:04:11)
Hints/Tips not a formula, but here are the first 44 by Charlie (2013-01-24 13:55:44)
Difficulty: 3 of 5Under Murder Mix Up (in Logic)
Posted on 2013-01-24 (6 Comments)
Solution computer solution by Charlie (2013-01-24 13:33:52)
Difficulty: 3 of 5Under 9 distinct digits in 3 products (in Numbers)
Posted on 2013-01-23 (2 Comments)
Solution computer solution by Charlie (2013-01-23 12:42:01)
Difficulty: 3 of 5Under An age conversation (in Just Math)
Posted on 2013-01-22 (3 Comments)
Solution computer solution by Charlie (2013-01-22 16:48:29)
Difficulty: 1 of 5Under Prime only as it is (in Numbers)
Posted on 2013-01-22 (2 Comments)
Solution analytic solution by Charlie (2013-01-22 13:41:36)
Solution computer solution by Charlie (2013-01-22 13:31:19)
Difficulty: 2 of 5Under Sourcing the Start (in Word Problems)
Posted on 2013-01-21 (3 Comments)
Solution computer-aided solution by Charlie (2013-01-21 18:05:23)
Difficulty: 2 of 5Under USA = n*UK (in Numbers)
Posted on 2013-01-21 (7 Comments)
re(3): computer solution - one lower by Charlie (2013-01-21 21:03:37)
re(2): computer solution - one lower by Charlie (2013-01-21 20:56:38)
Solution computer solution by Charlie (2013-01-21 12:12:29)
Difficulty: 3 of 5Under A cancellation fallacy (in Just Math)
Posted on 2013-01-18 (3 Comments)
Solution re(2): computer solutions -a partial errata by Charlie (2013-01-18 20:51:57)
Solution computer solutions by Charlie (2013-01-18 16:55:30)
Difficulty: 2 of 5Under Off by one (in Numbers)
Posted on 2013-01-18 (7 Comments)
re(2): two computer solutions by Charlie (2013-01-18 21:58:45)
Solution two computer solutions by Charlie (2013-01-18 12:11:10)
Difficulty: 3 of 5Under Lake Trips (in Logic)
Posted on 2013-01-17 (3 Comments)
Solution 6 scenarios--one solution (computer) by Charlie (2013-01-17 21:29:06)
Difficulty: 1 of 5Under Penny Drop (in Science)
Posted on 2013-01-17 (6 Comments)
re(2): Eureka! by Charlie (2013-01-17 20:31:49)
Difficulty: 3 of 5Under Prime it remains (in Numbers)
Posted on 2013-01-15 (4 Comments)
Solution computer solution by Charlie (2013-01-15 17:59:45)
Difficulty: 3 of 5Under A crowd of knights (in Numbers)
Posted on 2013-01-14 (3 Comments)
re: possible spoiler by Charlie (2013-01-14 17:09:26)
Some Thoughts possible spoiler by Charlie (2013-01-14 17:07:02)
Difficulty: 1 of 5Under Six Natives (in Liars and Knights)
Posted on 2013-01-14 (3 Comments)
Solution solution by Charlie (2013-01-14 13:31:21)
Difficulty: 4 of 5Under Thirteenth power (in Just Math)
Posted on 2013-01-12 (7 Comments)
re(2): why d1 .?...spoiler by Charlie (2013-01-12 13:58:49)
Difficulty: 3 of 5Under Two urns (in Probability)
Posted on 2013-01-10 (5 Comments)
Solution re(4): computer assisted solution -remarki by Charlie (2013-01-11 01:57:35)
re(2): computer assisted solution by Charlie (2013-01-10 22:32:28)
Solution computer assisted solution by Charlie (2013-01-10 18:36:33)
Difficulty: 2 of 5Under Weights and balls (in Weights and Scales)
Posted on 2013-01-09 (4 Comments)
re: Simple method. by Charlie (2013-01-10 02:29:41)
Solution solution by Charlie (2013-01-09 18:11:00)
Difficulty: 3 of 5Under Point to 2013 (in Just Math)
Posted on 2013-01-09 (7 Comments)
re: No Subject by Charlie (2013-01-10 11:49:58)
Solution With computer by Charlie (2013-01-09 12:48:13)
Difficulty: 2 of 5Under Triple 8 (in Numbers)
Posted on 2013-01-08 (9 Comments)
re: Generalisation by Charlie (2013-01-08 11:33:42)
Table by Charlie (2013-01-08 11:26:34)
Difficulty: 3 of 5Under Squaring the triangle (in Just Math)
Posted on 2013-01-07 (7 Comments)
Solution computer solution by Charlie (2013-01-07 18:10:56)
Difficulty: 3 of 5Under Consecutive in 2013 (in Sequences)
Posted on 2013-01-07 (5 Comments)
re: solution - spoiler by Charlie (2013-01-07 12:41:47)
Solution Two computer methods. by Charlie (2013-01-07 12:40:24)
Difficulty: 3 of 5Under Die Order (in Probability)
Posted on 2013-01-04 (7 Comments)
re: No Subject by Charlie (2013-01-05 08:39:24)
Difficulty: 1 of 5Under Told by an integer (in Numbers)
Posted on 2013-01-04 (3 Comments)
Solution Solution by Charlie (2013-01-04 13:39:37)
Difficulty: 3 of 5Under Ring in 2013 (in Numbers)
Posted on 2012-12-31 (5 Comments)
Hints/Tips Hint by Charlie (2013-01-05 12:18:21)
Hints/Tips re(3): 'Slide Rule' Logic by Charlie (2013-01-02 12:09:36)
re: 'Slide Rule' Logic by Charlie (2013-01-01 03:30:07)
Difficulty: 3 of 5Under xoF = (nx)oC (in Just Math)
Posted on 2012-12-31 (7 Comments)
Solution Solutions by Charlie (2012-12-31 15:02:51)
Difficulty: 4 of 5Under Modular mathematics (in Just Math)
Posted on 2012-12-28 (4 Comments)
Solution Likely all the cases by Charlie (2012-12-28 21:15:36)
Difficulty: 2 of 5Under Just arithmetic signs (in Numbers)
Posted on 2012-12-28 (10 Comments)
re(2): How about .. 2 questions & 1 remark. by Charlie (2013-01-05 08:36:24)
Solution How about ... by Charlie (2012-12-28 10:50:34)
Difficulty: 1 of 5Under 11 does not divide any of them (in Numbers)
Posted on 2012-12-26 (3 Comments)
Solution solution by Charlie (2012-12-26 17:32:47)
Difficulty: 3 of 5Under Sadism (in Numbers)
Posted on 2012-12-24 (9 Comments)
re(3): computer-assisted solution by Charlie (2012-12-24 21:26:49)
re(2): computer-assisted solution by Charlie (2012-12-24 21:21:29)
Solution computer-assisted solution by Charlie (2012-12-24 17:54:59)
Difficulty: 2 of 5Under Arm Appraisal III (in Liars and Knights)
Posted on 2012-12-21 (5 Comments)
re: Correct solution by Charlie (2012-12-22 09:58:13)
Solution solution by Charlie (2012-12-21 12:38:50)
Difficulty: 3 of 5Under Not a Prime (in Just Math)
Posted on 2012-12-20 (6 Comments)
re: answer by Charlie (2012-12-21 00:05:37)
Solution a proof by Charlie (2012-12-20 21:10:39)
Difficulty: 4 of 5Under All(?) about SEQ (in Numbers)
Posted on 2012-12-19 (1 Comments)
Solution solutions by Charlie (2012-12-20 01:18:32)
Difficulty: 3 of 5Under Phrase Perception (in Word Problems)
Posted on 2012-12-18 (11 Comments)
re: 2 MORE by Charlie (2012-12-18 16:19:55)
Some Thoughts Five full and two partial by Charlie (2012-12-18 14:07:57)
Difficulty: 3 of 5Under Five Fives Fancy Formula (in Just Math)
Posted on 2012-12-17 (4 Comments)
Solution computer exploration (spoiler) by Charlie (2012-12-17 17:44:44)
Difficulty: 3 of 5Under Surprised? (in Sequences)
Posted on 2012-12-15 (2 Comments)
re: No Subject -- oh yes, f(50) by Charlie (2012-12-15 18:16:30)
Solution No Subject by Charlie (2012-12-15 17:54:37)
Difficulty: 3 of 5Under Ratio Resolution III (in Weights and Scales)
Posted on 2012-12-14 (2 Comments)
Solution solution by Charlie (2012-12-14 12:42:26)
Difficulty: 3 of 5Under From Poland with love (in Just Math)
Posted on 2012-12-13 (2 Comments)
Solution computer solution by Charlie (2012-12-13 15:48:57)
Difficulty: 2 of 5Under Exp=log (in Just Math)
Posted on 2012-12-12 (9 Comments)
re: Solution by Charlie (2012-12-13 16:18:18)
re: possible solution--correction by Charlie (2012-12-12 17:24:19)
Solution possible solution by Charlie (2012-12-12 17:11:08)
Difficulty: 3 of 5Under Subtractive years (in Numbers)
Posted on 2012-12-12 (6 Comments)
Solution computer solution by Charlie (2012-12-12 12:44:13)
Difficulty: 3 of 5Under Border Magic (in Numbers)
Posted on 2012-12-11 (2 Comments)
Solution computer findings by Charlie (2012-12-11 17:26:05)
Difficulty: 3 of 5Under A Chamsonel Problem IV (in Liars and Knights)
Posted on 2012-12-10 (2 Comments)
Solution computer solution by Charlie (2012-12-10 14:03:01)
Difficulty: 4 of 5Under Primary Problem 2 (in Just Math)
Posted on 2012-12-09 (4 Comments)
re: Too simplistic? by Charlie (2012-12-10 10:15:40)
Difficulty: 2 of 5Under A List of Statements (in Logic)
Posted on 2012-12-07 (2 Comments)
Some Thoughts playing around with the first few by Charlie (2012-12-07 16:59:56)
Difficulty: 3 of 5Under Pyramid Maneuver (in Geometry)
Posted on 2012-12-06 (4 Comments)
Solution solution by Charlie (2012-12-06 17:20:00)
Difficulty: 2 of 5Under GCD of Fibonacci (in Numbers)
Posted on 2012-12-06 (2 Comments)
Solution solution by Charlie (2012-12-06 13:28:15)
Difficulty: 3 of 5Under Products of digits. (in Just Math)
Posted on 2012-12-05 (2 Comments)
Solution analytic and computer solutions by Charlie (2012-12-05 17:33:44)
Difficulty: 2 of 5Under One equation with nine unknowns! (2) (in Numbers)
Posted on 2012-12-05 (3 Comments)
re(2): computer solution by Charlie (2012-12-05 13:33:02)
Solution computer solution by Charlie (2012-12-05 12:22:19)
Difficulty: 3 of 5Under Find the triplets (in Just Math)
Posted on 2012-12-04 (3 Comments)
Solution Is this the solution? by Charlie (2012-12-04 14:36:19)
Difficulty: 3 of 5Under Arm Appraisal II (in Liars and Knights)
Posted on 2012-12-03 (2 Comments)
Solution computer solutions by Charlie (2012-12-03 17:58:07)
Difficulty: 1 of 5Under Why prime remainder? (in Just Math)
Posted on 2012-12-03 (1 Comments)
Solution solution by Charlie (2012-12-03 12:05:16)
Difficulty: 4 of 5Under Disk Magic (in Numbers)
Posted on 2012-11-30 (2 Comments)
Solution computer solutions by Charlie (2012-11-30 17:36:39)
Difficulty: 2 of 5Under Twelve Period Tease (in Just Math)
Posted on 2012-11-30 (5 Comments)
re(2): This may be right (Why it isn't.) by Charlie (2012-12-01 10:54:54)
Solution computer solution by Charlie (2012-11-30 12:22:52)
Difficulty: 3 of 5Under Bird Search (in Word Problems)
Posted on 2012-11-27 (2 Comments)
Solution computer solution by Charlie (2012-11-27 14:02:18)
Difficulty: 3 of 5Under Missing Word (in Word Problems)
Posted on 2012-11-26 (3 Comments)
re(2): continuing in a loop by Charlie (2012-12-03 14:34:04)
Hints/Tips continuing in a loop by Charlie (2012-11-26 12:08:52)
Difficulty: 3 of 5Under Getting closer (in Just Math)
Posted on 2012-11-25 (6 Comments)
Solution re: computer solution--correction by Charlie (2012-11-25 12:59:39)
Solution computer solution by Charlie (2012-11-25 12:40:34)
Difficulty: 3 of 5Under Drummer Deduction (in Logic)
Posted on 2012-11-23 (3 Comments)
Solution computer solution by Charlie (2012-11-23 20:49:55)
Difficulty: 5 of 5Under Equal digit sum (in Just Math)
Posted on 2012-11-22 (4 Comments)
Some Thoughts re: computer exploration--no proof by Charlie (2012-11-22 12:14:06)
Some Thoughts computer exploration--no proof by Charlie (2012-11-22 12:08:45)
Difficulty: 4 of 5Under Creeping Ants (in Probability)
Posted on 2012-11-21 (3 Comments)
Solution solution by Charlie (2012-11-21 21:11:38)
Difficulty: 3 of 5Under 5 partitions (in Just Math)
Posted on 2012-11-21 (3 Comments)
Solution solutions by Charlie (2012-11-21 17:24:02)
Difficulty: 3 of 5Under Not a clear cut (in Logic)
Posted on 2012-11-18 (4 Comments)
Solution possible solutions by Charlie (2012-11-18 11:22:52)
Difficulty: 3 of 5Under A Chamsonel Problem III (in Liars and Knights)
Posted on 2012-11-16 (1 Comments)
Solution computer solution by Charlie (2012-11-16 15:13:29)
Difficulty: 3 of 5Under Lawless Lawyer (in Logic)
Posted on 2012-11-13 (4 Comments)
Solution computer solution by Charlie (2012-11-13 12:26:17)
Difficulty: 3 of 5Under Consecutive Contemplation (in Numbers)
Posted on 2012-11-08 (6 Comments)
re(2): Not proven yet but I have a guess by Charlie (2012-11-08 22:31:52)
Difficulty: 2 of 5Under X-pandigital Words (in Word Problems)
Posted on 2012-11-07 (3 Comments)
Solution re(2): computer solutions -- revised complete lists by Charlie (2012-11-08 09:52:23)
Solution computer solutions by Charlie (2012-11-07 14:53:32)
Difficulty: 3 of 5Under Extraordinary Characteristics (in Logic)
Posted on 2012-11-06 (4 Comments)
re: Solution by Charlie (2012-11-10 08:03:26)
Solution computer solution by Charlie (2012-11-06 14:23:54)
Difficulty: 2 of 5Under Club Encounter (in General)
Posted on 2012-11-05 (3 Comments)
Solution solution by Charlie (2012-11-05 14:17:04)
Difficulty: 3 of 5Under Long(infinite?) way to create a palindrome (in Numbers)
Posted on 2012-11-04 (2 Comments)
Solution previous mention--spoiler by Charlie (2012-11-04 17:29:58)
Difficulty: 4 of 5Under Baking the best pie (in Numbers)
Posted on 2012-11-02 (2 Comments)
Solution more by Charlie (2012-11-02 11:56:59)
Difficulty: 3 of 5Under House Hindrance (in Liars and Knights)
Posted on 2012-11-01 (9 Comments)
Solution solution by Charlie (2012-11-01 17:14:48)
Difficulty: 3 of 5Under Vampire numbers (in Just Math)
Posted on 2012-10-31 (3 Comments)
Solution computer solution by Charlie (2012-10-31 12:45:40)
Difficulty: 3 of 5Under Quips et al (in Word Problems)
Posted on 2012-10-30 (8 Comments)
Some Thoughts one more by Charlie (2012-10-30 23:17:05)
Some Thoughts another by Charlie (2012-10-30 23:13:23)
Some Thoughts 2 more by Charlie (2012-10-30 11:00:39)
Difficulty: 3 of 5Under Monstrous prime? (in Just Math)
Posted on 2012-10-29 (4 Comments)
Some Thoughts re(2): Prime? by Charlie (2012-10-30 17:06:29)
Difficulty: 3 of 5Under Special Numbers II (in Just Math)
Posted on 2012-10-28 (1 Comments)
Solution computer solution by Charlie (2012-10-28 16:54:45)
Difficulty: 2 of 5Under my house's number II (in Numbers)
Posted on 2012-10-27 (3 Comments)
Solution computer solution by Charlie (2012-10-27 14:02:41)
Difficulty: 3 of 5Under Exploring HCNs (in Numbers)
Posted on 2012-10-26 (5 Comments)
Some Thoughts First three and part of 4. by Charlie (2012-10-26 12:58:26)
Difficulty: 2 of 5Under Away from home (in Just Math)
Posted on 2012-10-23 (2 Comments)
Solution solution by Charlie (2012-10-23 13:39:55)
Difficulty: 2 of 5Under Gender and Occupation (in Logic)
Posted on 2012-10-22 (6 Comments)
re: spoiler by Charlie (2012-10-22 12:37:37)
Solution computer solution by Charlie (2012-10-22 12:36:08)
Difficulty: 3 of 5Under A Chamsonel Problem II (in Liars and Knights)
Posted on 2012-10-19 (3 Comments)
Solution solution by Charlie (2012-10-19 12:48:20)
Difficulty: 2 of 5Under White vs red (in Probability)
Posted on 2012-10-17 (2 Comments)
Solution solution with 2 formulae: Sigma Pi and recursive by Charlie (2012-10-17 12:43:07)
Difficulty: 4 of 5Under P/Q (in Just Math)
Posted on 2012-10-12 (5 Comments)
Solution computer solution by Charlie (2012-10-12 12:32:05)
Difficulty: 3 of 5Under A Coin Game II (in Probability)
Posted on 2012-10-09 (1 Comments)
Solution A solution--could it be simplified? by Charlie (2012-10-09 13:55:39)
Difficulty: 3 of 5Under Analogous Days (in General)
Posted on 2012-10-04 (1 Comments)
Solution computer solution by Charlie (2012-10-04 18:47:41)
Difficulty: 2 of 5Under Three Fractions II (in Numbers)
Posted on 2012-10-01 (4 Comments)
Solution computer solution by Charlie (2012-10-01 13:51:26)
Difficulty: 3 of 5Under Stopping for lunch II (in Just Math)
Posted on 2012-09-28 (1 Comments)
Hints/Tips computer exploration by Charlie (2012-09-28 23:44:25)
Difficulty: 2 of 5Under A flawed proof? (2) (in Tricks)
Posted on 2012-09-27 (3 Comments)
re: You can't do that by Charlie (2012-09-27 11:56:04)
Difficulty: 3 of 5Under Two times n equals 2n-1 (in Word Problems)
Posted on 2012-09-25 (2 Comments)
Solution computer solution by Charlie (2012-09-25 14:44:14)
Difficulty: 2 of 5Under Palindrome ponder (in Just Math)
Posted on 2012-09-23 (8 Comments)
re(3): No Subject by Charlie (2012-09-23 22:07:06)
Solution computer solution by Charlie (2012-09-23 12:32:14)
Difficulty: 3 of 5Under A productive s.o.d. (in Just Math)
Posted on 2012-09-19 (5 Comments)
Solution No Subject by Charlie (2012-09-19 16:46:19)
Difficulty: 3 of 5Under Tri Square (in Geometry)
Posted on 2012-09-16 (3 Comments)
Some Thoughts not a proof except for a limited grid by Charlie (2012-09-16 20:53:47)
Difficulty: 3 of 5Under Awesome Level (in Numbers)
Posted on 2012-09-15 (2 Comments)
Solution part 1 computer solution by Charlie (2012-09-15 16:17:03)
Difficulty: 3 of 5Under A frugal sequence (in Numbers)
Posted on 2012-09-14 (13 Comments)
re(4): interesting side topic -- economical numbers -- transcription error compounded by Charlie (2012-09-15 15:29:05)
Some Thoughts re(2): interesting side topic -- economical numbers -- transcription error compounded by Charlie (2012-09-15 10:33:20)
Some Thoughts interesting side topic -- economical numbers by Charlie (2012-09-15 01:35:11)
Some Thoughts re: computer results so far by Charlie (2012-09-14 18:01:25)
Some Thoughts computer results so far by Charlie (2012-09-14 15:59:58)
re(3): Solution by Charlie (2012-09-14 15:57:10)
Difficulty: 3 of 5Under Boxing Baffle (in Logic)
Posted on 2012-09-12 (4 Comments)
Solution computer solution by Charlie (2012-09-12 15:58:11)
Difficulty: 4 of 5Under by L. Euler (in General)
Posted on 2012-09-08 (8 Comments)
Question difficulty level by Charlie (2012-09-08 13:24:12)
Difficulty: 3 of 5Under Poker Game (in Probability)
Posted on 2012-09-07 (4 Comments)
simulation verification by Charlie (2012-09-07 16:17:46)
Solution solution by Charlie (2012-09-07 12:48:55)
Difficulty: 3 of 5Under A palindrome product (in Numbers)
Posted on 2012-09-05 (4 Comments)
All the palindromes by Charlie (2012-09-05 12:59:57)
Solution computer solution by Charlie (2012-09-05 12:58:56)
Difficulty: 3 of 5Under Arm Appraisal (in Liars and Knights)
Posted on 2012-09-04 (5 Comments)
Solution computer solution by Charlie (2012-09-04 10:53:59)
Difficulty: 2 of 5Under Wordates (in General)
Posted on 2012-09-03 (7 Comments)
re(3): computer solution by Charlie (2012-09-04 09:55:56)
Some Thoughts re: computer solution by Charlie (2012-09-03 15:02:04)
Solution computer solution by Charlie (2012-09-03 14:41:34)
Difficulty: 2 of 5Under Pandoprime (in Numbers)
Posted on 2012-09-01 (2 Comments)
Solution computer solution by Charlie (2012-09-01 13:35:26)
Difficulty: 3 of 5Under 5th powers (in Numbers)
Posted on 2012-08-30 (4 Comments)
re: The purpose isnt to fail the student, it's to help them succeed by Charlie (2012-08-31 09:59:39)
Solution computer solution by Charlie (2012-08-30 14:31:37)
Difficulty: 3 of 5Under Complex Conclusion (in Just Math)
Posted on 2012-08-29 (7 Comments)
Some Thoughts computer exploration by Charlie (2012-08-29 12:54:45)
Difficulty: 3 of 5Under A Pythagorean triplet (in Numbers)
Posted on 2012-08-28 (4 Comments)
Solution computer solution by Charlie (2012-08-28 11:14:42)
Difficulty: 3 of 5Under Killer and Victim (in Logic)
Posted on 2012-08-26 (6 Comments)
Solution computer solution by Charlie (2012-08-26 15:42:50)
Difficulty: 4 of 5Under Less than ten thou (in Numbers)
Posted on 2012-08-25 (1 Comments)
Solution Less than 9801--computer assisted solution by Charlie (2012-08-25 15:43:44)
Difficulty: 3 of 5Under Where 2^n leads, 3^n cannot be far behind... (in Numbers)
Posted on 2012-08-24 (2 Comments)
re: solution -- correction by Charlie (2012-08-24 22:05:37)
Solution solution by Charlie (2012-08-24 15:33:51)
Difficulty: 3 of 5Under Fifth power factor (in Just Math)
Posted on 2012-08-22 (4 Comments)
Some Thoughts computer exploration by Charlie (2012-08-22 15:42:14)
Difficulty: 4 of 5Under Who am I? (in Riddles)
Posted on 2012-08-21 (3 Comments)
Some Thoughts Able was I (partial spoiler) by Charlie (2012-08-21 10:54:51)
Difficulty: 1 of 5Under Consecutive digits (in Numbers)
Posted on 2012-08-20 (3 Comments)
Solution computer solution by Charlie (2012-08-20 12:26:50)
Difficulty: 3 of 5Under The number p (in Numbers)
Posted on 2012-08-19 (1 Comments)
Solution computer solution by Charlie (2012-08-19 15:52:08)
Difficulty: 3 of 5Under 86 at most (in Numbers)
Posted on 2012-08-18 (2 Comments)
Solution more detailed solution by Charlie (2012-08-18 15:07:44)
Difficulty: 3 of 5Under Floor and Absolute (in Calculus)
Posted on 2012-08-17 (2 Comments)
Solution solution by Charlie (2012-08-17 14:36:08)
Difficulty: 2 of 5Under Name it correctly (in Logic)
Posted on 2012-08-16 (8 Comments)
Solution putting it together by Charlie (2012-08-16 11:59:37)
re: Solution Part 1 by Charlie (2012-08-16 11:24:06)
Difficulty: 3 of 5Under Odd One Out III (in Word Problems)
Posted on 2012-08-15 (14 Comments)
re(2): weird language by Charlie (2012-08-17 10:03:36)
weird language by Charlie (2012-08-16 08:05:40)
Some Thoughts maybe (possible spoiler) by Charlie (2012-08-15 12:36:31)
Difficulty: 2 of 5Under A powerful s.o.d. (in Numbers)
Posted on 2012-08-14 (5 Comments)
Solution computer solution by Charlie (2012-08-14 15:24:35)
Difficulty: 3 of 5Under Dollars and Cents (in Just Math)
Posted on 2012-08-13 (6 Comments)
Question re(2): Solution by Charlie (2012-08-13 12:52:53)
Solution computer solution by Charlie (2012-08-13 12:43:47)
Difficulty: 4 of 5Under Sixes and Sevens--Not! (in Numbers)
Posted on 2012-08-12 (33 Comments)
re(7): IMHO - STILL REDUNDANT by Charlie (2012-08-15 17:20:23)
re(5): IMHO - STILL REDUNDANT by Charlie (2012-08-15 12:49:22)
Question re(3): IMHO - STILL REDUNDANT by Charlie (2012-08-13 17:10:26)
re: No Subject by Charlie (2012-08-13 00:05:57)
re(4): solution WRONG by Charlie (2012-08-12 23:55:33)
re: To lead or not by Charlie (2012-08-12 23:49:56)
re(3): solution by Charlie (2012-08-12 23:46:04)
Difficulty: 2 of 5Under Some cubes! (in Numbers)
Posted on 2012-08-10 (8 Comments)
re: first part by Charlie (2012-08-10 12:26:13)
Solution computer solution by Charlie (2012-08-10 12:21:18)
Difficulty: 3 of 5Under Triangles in a Triangle (in General)
Posted on 2012-08-09 (3 Comments)
Solution computer solution by Charlie (2012-08-09 16:08:41)
Difficulty: 3 of 5Under Additive years (in Numbers)
Posted on 2012-08-08 (6 Comments)
Solution computer solution by Charlie (2012-08-08 12:38:33)
Difficulty: 4 of 5Under Wilson the 3rd (in Numbers)
Posted on 2012-08-07 (5 Comments)
re(2): computer solution - WHAT comp. language ? by Charlie (2012-08-08 10:05:25)
Solution computer solution by Charlie (2012-08-07 16:01:19)
Difficulty: 3 of 5Under The lowest sums (in Just Math)
Posted on 2012-08-04 (3 Comments)
Solution solutions by Charlie (2012-08-04 14:17:12)
Difficulty: 3 of 5Under Squares in a Triangle (in General)
Posted on 2012-08-01 (4 Comments)
Solution computer solutions by Charlie (2012-08-01 13:55:32)
Difficulty: 1 of 5Under A quicky (in Numbers)
Posted on 2012-07-31 (6 Comments)
Solution short explanation by Charlie (2012-07-31 22:47:54)
Difficulty: 3 of 5Under Discard Dice (in Probability)
Posted on 2012-07-27 (4 Comments)
Solution solution by Charlie (2012-07-27 16:53:43)
Difficulty: 3 of 5Under Succinct Sundays (in General)
Posted on 2012-07-23 (2 Comments)
Solution computer solution by Charlie (2012-07-23 15:45:46)
Difficulty: 3 of 5Under Machine Machinations (in Weights and Scales)
Posted on 2012-07-21 (5 Comments)
re(3): solution by Charlie (2012-07-22 10:45:24)
re: solution by Charlie (2012-07-22 02:34:28)
Solution computer-aided solution by Charlie (2012-07-21 16:47:49)
Difficulty: 3 of 5Under Numbered Letters III (in Word Problems)
Posted on 2012-07-20 (9 Comments)
Some Thoughts Also to consider by Charlie (2012-07-20 23:33:23)
Some Thoughts another pair by Charlie (2012-07-20 23:22:26)
Some Thoughts more by Charlie (2012-07-20 14:23:47)
Some Thoughts re: more trial and error by Charlie (2012-07-20 13:22:57)
Some Thoughts more trial and error by Charlie (2012-07-20 13:12:14)
Some Thoughts trial and error by Charlie (2012-07-20 10:22:11)
Difficulty: 3 of 5Under 1232 is HERE (in Numbers)
Posted on 2012-07-18 (2 Comments)
Solution solutions by Charlie (2012-07-18 14:16:21)
Difficulty: 2 of 5Under Five Lumberjacks (in Logic)
Posted on 2012-07-17 (4 Comments)
Solution computer solution by Charlie (2012-07-17 17:06:40)
Difficulty: 3 of 5Under Revoltosos (in Liars and Knights)
Posted on 2012-07-16 (3 Comments)
Solution solution by Charlie (2012-07-16 13:00:50)
Difficulty: 3 of 5Under 2012 Equal Expressions (in Numbers)
Posted on 2012-07-15 (12 Comments)
re(6): PARTIAL answer by Charlie (2012-07-16 14:07:52)
Question re(4): PARTIAL answer by Charlie (2012-07-15 19:10:13)
re(2): PARTIAL answer by Charlie (2012-07-15 18:41:23)
re: PARTIAL answer by Charlie (2012-07-15 18:38:22)
re: computer solution by Charlie (2012-07-15 16:07:21)
Solution computer solution part 2 (F thru I) by Charlie (2012-07-15 16:03:15)
Solution computer solution by Charlie (2012-07-15 15:59:57)
Difficulty: 2 of 5Under Angles missing (in Geometry)
Posted on 2012-07-09 (1 Comments)
Solution solution by Charlie (2012-07-09 12:17:43)
Difficulty: 4 of 5Under Three Words II (in Word Problems)
Posted on 2012-07-08 (4 Comments)
Solution computer solution by Charlie (2012-07-08 17:42:21)
Difficulty: 3 of 5Under The Magnificent Eleven (in Numbers)
Posted on 2012-07-07 (3 Comments)
Solution computer solution by Charlie (2012-07-07 18:12:09)
Difficulty: 3 of 5Under All 10 digits (in Probability)
Posted on 2012-07-06 (5 Comments)
re(2): Leading answer (spoiler) by Charlie (2012-07-08 23:30:43)
Solution Solution the hard way and the easy way by Charlie (2012-07-06 13:22:55)
Difficulty: 3 of 5Under Nevo and Oven (in Numbers)
Posted on 2012-07-04 (1 Comments)
Solution computer solution by Charlie (2012-07-04 18:40:41)
Difficulty: 4 of 5Under Getting closer to three targets (in Numbers)
Posted on 2012-07-01 (2 Comments)
Solution computer solution by Charlie (2012-07-01 18:36:12)
Difficulty: 3 of 5Under Sum of primes is a square (in Numbers)
Posted on 2012-06-29 (2 Comments)
Solution re: computer solution with an extension by Charlie (2012-06-29 16:14:23)
Solution computer solution with an extension by Charlie (2012-06-29 16:04:50)
Difficulty: 3 of 5Under Mixed Doubles II - Keyboard Konfusion (in Word Problems)
Posted on 2012-06-27 (1 Comments)
Solution Solution by Charlie (2012-06-27 17:13:33)
Difficulty: 3 of 5Under Nod to fife and food (in Numbers)
Posted on 2012-06-26 (5 Comments)
re: Surprised by Charlie (2012-06-27 10:25:45)
re: Food by Charlie (2012-06-26 17:19:43)
Difficulty: 2 of 5Under One is k times the other (in Numbers)
Posted on 2012-06-25 (7 Comments)
re(2): Possible solution by Charlie (2012-06-26 10:20:52)
Difficulty: 4 of 5Under Complementary, my dear Watson (in Numbers)
Posted on 2012-06-22 (6 Comments)
Question re: Bonus by Charlie (2012-06-23 10:22:59)
Solution computer solution by Charlie (2012-06-22 14:41:30)
Difficulty: 3 of 5Under Hexagonal triples (in Word Problems)
Posted on 2012-06-20 (2 Comments)
Solution computer solution by Charlie (2012-06-20 17:58:17)
Difficulty: 1 of 5Under Play on words II (in Riddles)
Posted on 2012-06-19 (8 Comments)
Some Thoughts half an answer by Charlie (2012-06-19 11:08:27)
Difficulty: 3 of 5Under Abjad Analysis II (in Word Problems)
Posted on 2012-06-18 (6 Comments)
Solution an answer by Charlie (2012-06-19 09:24:29)
Difficulty: 3 of 5Under Prime, anyway (in Numbers)
Posted on 2012-06-17 (2 Comments)
Solution computer solution by Charlie (2012-06-17 16:34:33)
Difficulty: 3 of 5Under Find this cube! (in Numbers)
Posted on 2012-06-16 (4 Comments)
Solution computer solution by Charlie (2012-06-16 12:56:15)
Difficulty: 3 of 5Under Groups of Nine (in Word Problems)
Posted on 2012-06-15 (1 Comments)
Solution computer solution by Charlie (2012-06-15 13:59:16)
Difficulty: 3 of 5Under The smallest sum II (in Numbers)
Posted on 2012-06-10 (3 Comments)
Solution computer solution for part 2 (spoiler) by Charlie (2012-06-10 20:29:42)
Difficulty: 3 of 5Under Use all nine (in Numbers)
Posted on 2012-06-08 (3 Comments)
Solution computer solution by Charlie (2012-06-09 10:51:25)
Difficulty: 3 of 5Under Most Trickiest Pearls (in Weights and Scales)
Posted on 2012-06-07 (1 Comments)
Solution solution if it's a spring scale measuring grams on a dial by Charlie (2012-06-08 00:11:57)
Difficulty: 3 of 5Under Excited to win (in Probability)
Posted on 2012-06-06 (1 Comments)
Solution solution by Charlie (2012-06-06 14:59:30)
Difficulty: 3 of 5Under Mixed Doubles (in Word Problems)
Posted on 2012-06-04 (6 Comments)
Solution solution by Charlie (2012-06-04 17:12:54)
Difficulty: 3 of 5Under The smallest sum (in Numbers)
Posted on 2012-06-02 (8 Comments)
re(2): a general formula by Charlie (2012-06-03 10:35:34)
Solution aha -- computer solution by Charlie (2012-06-02 13:48:42)
Some Thoughts thoughts by Charlie (2012-06-02 13:08:08)
Difficulty: 2 of 5Under Produce More (in Numbers)
Posted on 2012-05-29 (5 Comments)
re: A very tricky problem (spoiler) by Charlie (2012-05-29 15:00:38)
Difficulty: 3 of 5Under Sorta pythagoric...(2) (in Just Math)
Posted on 2012-05-26 (5 Comments)
Some Thoughts computer exploration by Charlie (2012-05-26 13:49:24)
Difficulty: 4 of 5Under Repeated roll (in Probability)
Posted on 2012-05-25 (4 Comments)
Question re: Answers ---spoiler by Charlie (2012-05-25 14:32:10)
Solution solution by Charlie (2012-05-25 14:30:40)
Difficulty: 2 of 5Under Knaves! (in Liars and Knights)
Posted on 2012-05-21 (4 Comments)
Solution solution by Charlie (2012-05-21 17:56:47)
Difficulty: 2 of 5Under A number pyramid (in Numbers)
Posted on 2012-05-18 (3 Comments)
Solution re(2): computer result: 11 solutions and two almost-solutions by Charlie (2012-05-18 18:09:20)
Solution computer result: 11 solutions and two almost-solutions by Charlie (2012-05-18 15:16:23)
Difficulty: 3 of 5Under Ready, action…,CUT! (in Geometry)
Posted on 2012-05-16 (19 Comments)
re: The Bun Problem by Charlie (2012-05-20 19:09:21)
Difficulty: 3 of 5Under Island President (in Liars and Knights)
Posted on 2012-05-15 (2 Comments)
Solution solution by Charlie (2012-05-15 17:21:12)
Difficulty: 3 of 5Under A beast in a pie (in Numbers)
Posted on 2012-05-13 (1 Comments)
Solution computer solution by Charlie (2012-05-13 12:51:51)
Difficulty: 4 of 5Under Special palindromes (in Numbers)
Posted on 2012-05-11 (2 Comments)
Solution computer solution (spoilers) by Charlie (2012-05-11 14:06:26)
Difficulty: 1 of 5Under Doubtful Divisibility (in Tricks)
Posted on 2012-05-09 (3 Comments)
re: Error(s) spotted by Charlie (2012-05-09 13:42:55)
Solution solution by Charlie (2012-05-09 13:40:51)
Difficulty: 2 of 5Under Greatest Integer Sum (in Just Math)
Posted on 2012-05-07 (4 Comments)
re: Possible answer (spoiler?) by Charlie (2012-05-07 14:16:59)
Solution solution by Charlie (2012-05-07 14:13:06)
Difficulty: 3 of 5Under Mirror, mirror (in Numbers)
Posted on 2012-05-04 (4 Comments)
re: computer solution -- count by length by Charlie (2012-05-04 16:39:02)
Solution computer solution by Charlie (2012-05-04 13:02:36)
Difficulty: 3 of 5Under Lengthy Containment (in Word Problems)
Posted on 2012-05-02 (2 Comments)
Solution computer solution (spoilers) by Charlie (2012-05-02 13:27:09)
Difficulty: 2 of 5Under Many Multiples (in Sequences)
Posted on 2012-04-30 (8 Comments)
Solution solution (spoiler) by Charlie (2012-04-30 14:54:09)
Difficulty: 4 of 5Under Smart Trams (in Word Problems)
Posted on 2012-04-26 (10 Comments)
Solution computer solution (spoilers) by Charlie (2012-04-26 12:39:23)
Difficulty: 3 of 5Under Minimal Primes (in Numbers)
Posted on 2012-04-24 (5 Comments)
re: of course it also inspires a computer program by Charlie (2012-04-24 17:28:34)
of course it also inspires a computer program by Charlie (2012-04-24 16:50:53)
Solution solution by Charlie (2012-04-24 16:17:04)
Difficulty: 3 of 5Under Type Deduction II (in Liars and Knights)
Posted on 2012-04-23 (3 Comments)
Solution computer solution by Charlie (2012-04-23 13:13:39)
Difficulty: 3 of 5Under SUMUS (in Just Math)
Posted on 2012-04-21 (1 Comments)
Solution computer solution by Charlie (2012-04-21 14:12:08)
Difficulty: 3 of 5Under Closest to e (in Numbers)
Posted on 2012-04-18 (6 Comments)
Solution computer solution (so far) for part C, subpart B by Charlie (2012-04-21 01:11:00)
Solution computer solution to A and B by Charlie (2012-04-18 16:13:17)
Difficulty: 3 of 5Under Twenty what?! (in Word Problems)
Posted on 2012-04-17 (10 Comments)
Some Thoughts m by Charlie (2012-04-17 11:32:38)
Difficulty: 3 of 5Under Lengthy Word 2 (in Word Problems)
Posted on 2012-04-16 (2 Comments)
Solution computer solution by Charlie (2012-04-16 13:33:48)
Difficulty: 3 of 5Under Three Power Remainder (in Just Math)
Posted on 2012-04-14 (4 Comments)
Solution UBASIC solution by Charlie (2012-04-15 10:54:41)
Difficulty: 4 of 5Under No comments (in General)
Posted on 2012-04-12 (3 Comments)
Solution computer solution by Charlie (2012-04-12 12:20:25)
Difficulty: 3 of 5Under Four people II (in Logic)
Posted on 2012-04-11 (6 Comments)
Solution solution by Charlie (2012-04-11 12:16:17)
Difficulty: 3 of 5Under End and Begin (in Word Problems)
Posted on 2012-04-09 (7 Comments)
Solution computer solutions by Charlie (2012-04-09 12:25:48)
Some Thoughts three off the top of my head by Charlie (2012-04-09 10:29:15)
Difficulty: 3 of 5Under The wine is so-so, but... (in Numbers)
Posted on 2012-04-06 (8 Comments)
Solution computer solution by Charlie (2012-04-06 13:44:50)
Difficulty: 3 of 5Under Point to 2012 (in Just Math)
Posted on 2012-04-04 (7 Comments)
re(2): computer solution by Charlie (2012-04-04 14:49:42)
Solution computer solution by Charlie (2012-04-04 12:37:44)
Difficulty: 3 of 5Under Prime Selection (in Numbers)
Posted on 2012-04-03 (6 Comments)
Solution re(2): computer solutions by Charlie (2012-04-04 10:39:55)
Solution computer solutions by Charlie (2012-04-04 08:44:48)
Difficulty: 3 of 5Under Lengthy Word (in Word Problems)
Posted on 2012-03-29 (21 Comments)
Solution computer solution by Charlie (2012-03-29 11:51:04)
Difficulty: 3 of 5Under Sorting Coins II (in Weights and Scales)
Posted on 2012-03-28 (4 Comments)
Some Thoughts weighing in with the theoretical minimum--no solution offered by Charlie (2012-03-28 09:44:53)
Difficulty: 3 of 5Under Some sums (in Sequences)
Posted on 2012-03-26 (3 Comments)
Some Thoughts similar series by Charlie (2012-03-27 22:38:03)
Solution computer solution--extended to all values of k by Charlie (2012-03-26 11:35:23)
Difficulty: 2 of 5Under From primes to palindrome (in Numbers)
Posted on 2012-03-24 (7 Comments)
Solution computer solutions by Charlie (2012-03-24 14:25:48)
Difficulty: 1 of 5Under Slick Equality (in Tricks)
Posted on 2012-03-20 (3 Comments)
Solution solution by Charlie (2012-03-20 12:11:57)
Difficulty: 3 of 5Under Summing inverses II (in Just Math)
Posted on 2012-03-16 (12 Comments)
re(3): computer solution- my accuracy by Charlie (2012-03-17 00:34:05)
Solution re(2): computer solution by Charlie (2012-03-16 16:57:55)
Solution computer solution by Charlie (2012-03-16 12:46:14)
Difficulty: 3 of 5Under A Cup Of Coffee II (in Weights and Scales)
Posted on 2012-03-06 (11 Comments)
Some Thoughts minimum number of steps for the given pcts by Charlie (2012-03-09 13:14:39)
re(3): Possible solution by Charlie (2012-03-07 10:57:12)
re: possible solution by Charlie (2012-03-07 10:39:52)
re: Possible solution by Charlie (2012-03-06 15:28:55)
Some Thoughts computer exploration to what's possible up to 15 steps by Charlie (2012-03-06 13:54:14)
Difficulty: 3 of 5Under Simultaneous Operations - Pairs (in Numbers)
Posted on 2012-03-03 (4 Comments)
Solution solutions by Charlie (2012-03-03 15:12:55)
Difficulty: 3 of 5Under Inner Insertion (in Word Problems)
Posted on 2012-03-01 (5 Comments)
Some Thoughts a start by Charlie (2012-03-01 10:22:07)
Difficulty: 3 of 5Under Pi repeats (in Numbers)
Posted on 2012-02-29 (3 Comments)
Solution computer solution by Charlie (2012-02-29 15:35:48)
Difficulty: 2 of 5Under Another Magic Die (in Probability)
Posted on 2012-02-28 (8 Comments)
re: No Subject by Charlie (2012-02-29 00:17:02)
re: Don't forget 0! (spoiler) by Charlie (2012-02-28 22:16:06)
Solution here's what I get by Charlie (2012-02-28 22:08:30)
Difficulty: 3 of 5Under Matchstick Frenzy II (in Just Math)
Posted on 2012-02-26 (6 Comments)
Some Thoughts thoughts by Charlie (2012-02-26 13:19:46)
Difficulty: 2 of 5Under 39 does it (in Just Math)
Posted on 2012-02-19 (4 Comments)
Solution solution I think--based on computer exploration by Charlie (2012-02-19 12:49:08)
Some Thoughts computer exploration -- bonus only is shown by Charlie (2012-02-19 12:38:12)
Difficulty: 3 of 5Under Coincidental Days (in General)
Posted on 2012-02-16 (2 Comments)
Solution computer solution by Charlie (2012-02-16 15:34:41)
Difficulty: 3 of 5Under Special primes (in Numbers)
Posted on 2012-02-12 (3 Comments)
re: computer solution by Charlie (2012-02-12 18:33:42)
Solution computer solution by Charlie (2012-02-12 18:26:57)
Difficulty: 4 of 5Under Ascension II (in Word Problems)
Posted on 2012-02-10 (5 Comments)
Some Thoughts computer assisted parts iii and iv by Charlie (2012-02-12 13:35:48)
re: non-computer exploration of parts iii, iv & bonusi by Charlie (2012-02-11 11:31:46)
Some Thoughts computer exploration of parts i and ii by Charlie (2012-02-11 00:27:31)
Difficulty: 5 of 5Under Inherited Veracity (in Liars and Knights)
Posted on 2012-02-09 (4 Comments)
Solution computer solution by Charlie (2012-02-09 18:12:55)
Difficulty: 3 of 5Under Prime-go-round (in Numbers)
Posted on 2012-02-06 (2 Comments)
Solution computer solution by Charlie (2012-02-06 16:50:13)
Difficulty: 2 of 5Under Running Race (in Liars and Knights)
Posted on 2012-01-31 (5 Comments)
Solution two solutions? by Charlie (2012-01-31 13:49:36)
Difficulty: 3 of 5Under Logical connectives (in Algorithms)
Posted on 2012-01-24 (6 Comments)
Solution solution by Charlie (2012-01-24 16:11:59)
Difficulty: 4 of 5Under Elite Etile (in Word Problems)
Posted on 2012-01-23 (3 Comments)
Solution computer solution by Charlie (2012-01-23 15:21:03)
Difficulty: 3 of 5Under Suffix Settlement (in Word Problems)
Posted on 2012-01-17 (8 Comments)
Solution from the head and from the computer by Charlie (2012-01-17 13:01:26)
Difficulty: 4 of 5Under DIY prime magic (in Numbers)
Posted on 2012-01-13 (10 Comments)
re(3): From the computer -semi-spoiler by Charlie (2012-01-21 11:02:43)
re(3): From the computer -semi-spoiler by Charlie (2012-01-14 11:31:56)
Question re: From the computer -semi-spoiler by Charlie (2012-01-13 23:33:57)
Difficulty: 4 of 5Under Abarcadraba (in Word Problems)
Posted on 2012-01-10 (4 Comments)
Solution computer solution by Charlie (2012-01-10 21:24:12)
Difficulty: 3 of 5Under Find out (in Numbers)
Posted on 2012-01-08 (2 Comments)
re: computer solution--something bad happened at the unasked-for k=11 by Charlie (2012-01-08 13:29:35)
Solution computer solution by Charlie (2012-01-08 13:16:39)
Difficulty: 3 of 5Under Numeric Meld (in Numbers)
Posted on 2012-01-06 (3 Comments)
re(2): computer solution by Charlie (2012-01-07 10:16:33)
Solution computer solution by Charlie (2012-01-06 15:00:55)
Difficulty: 3 of 5Under More about 1729 (in Numbers)
Posted on 2012-01-04 (8 Comments)
re(3): computer solution by Charlie (2012-01-04 15:03:09)
Solution computer solution by Charlie (2012-01-04 13:09:53)
Difficulty: 2 of 5Under Hidden Birds (in Word Problems)
Posted on 2012-01-02 (2 Comments)
Solution solution by Charlie (2012-01-02 15:45:57)
Difficulty: 4 of 5Under PentaWord 3 - Vowel Ring (in Word Problems)
Posted on 2011-12-28 (5 Comments)
re: Tutorials? by Charlie (2011-12-29 10:19:43)
Solution computer solution by Charlie (2011-12-28 13:48:38)
Difficulty: 2 of 5Under A repunit number (in Numbers)
Posted on 2011-12-26 (5 Comments)
re(2): is there a mistake in the puzzle? by Charlie (2011-12-26 14:54:09)
Question is there a mistake in the puzzle? by Charlie (2011-12-26 10:59:43)
Difficulty: 3 of 5Under Summing square inverses (in Just Math)
Posted on 2011-12-25 (2 Comments)
Solution with the aid of a computer by Charlie (2011-12-25 14:42:59)
Difficulty: 3 of 5Under Type deduction (in Liars and Knights)
Posted on 2011-12-24 (3 Comments)
Solution solution by Charlie (2011-12-24 18:14:30)
Difficulty: 3 of 5Under Prime or divisible by 3 (in Numbers)
Posted on 2011-12-23 (1 Comments)
Solution computer solution by Charlie (2011-12-23 15:49:41)
Difficulty: 2 of 5Under Two expressions (in Numbers)
Posted on 2011-12-22 (1 Comments)
Solution computer solution (spoiler) by Charlie (2011-12-22 14:09:17)
Difficulty: 3 of 5Under 8s and 9s (in Numbers)
Posted on 2011-12-21 (7 Comments)
re: answers- spoiler by Charlie (2011-12-22 09:59:53)
Solution computer solution by Charlie (2011-12-21 12:41:17)
Difficulty: 3 of 5Under Word Meld 8 (in Word Problems)
Posted on 2011-12-20 (2 Comments)
Solution some solutions by Charlie (2011-12-21 00:15:33)
Difficulty: 2 of 5Under Find my number (in Numbers)
Posted on 2011-12-19 (10 Comments)
Solution re(3): No problem (spoiler), if composite by Charlie (2011-12-20 10:20:35)
Difficulty: 4 of 5Under PentaWord 2 (in Word Problems)
Posted on 2011-12-18 (2 Comments)
Solution computer solution (spoiler) by Charlie (2011-12-18 13:28:17)
Difficulty: 3 of 5Under N-Divisibility II (in Just Math)
Posted on 2011-12-17 (5 Comments)
Solution solution by Charlie (2011-12-17 12:51:51)
Difficulty: 3 of 5Under 5-digit period (in Just Math)
Posted on 2011-12-16 (3 Comments)
Solution computer solution by Charlie (2011-12-16 22:13:25)
Difficulty: 3 of 5Under Singer Settlement (in Word Problems)
Posted on 2011-12-15 (14 Comments)
9 by Charlie (2011-12-15 21:54:49)
4 by Charlie (2011-12-15 21:53:20)
3 by Charlie (2011-12-15 21:50:03)
13 by Charlie (2011-12-15 21:32:29)
6 by Charlie (2011-12-15 21:30:01)
5 by Charlie (2011-12-15 21:27:16)
11 by Charlie (2011-12-15 16:02:30)
Some Thoughts 1,7 and 14 by Charlie (2011-12-15 12:40:40)
Difficulty: 4 of 5Under PentaWord 1 (in General)
Posted on 2011-12-14 (6 Comments)
re: Solved? (spoiler?) by Charlie (2011-12-14 17:03:41)
Solution computer solution agrees by Charlie (2011-12-14 16:59:05)
Difficulty: 2 of 5Under SF Author Quote (in Cryptography)
Posted on 2011-12-09 (3 Comments)
Solution full solution by Charlie (2011-12-10 10:24:02)
Difficulty: 2 of 5Under Ones or twos (in Just Math)
Posted on 2011-12-07 (4 Comments)
re: Depends what natural numbers are. by Charlie (2011-12-07 12:49:46)
Difficulty: 3 of 5Under Four Point Polygons (in Probability)
Posted on 2011-12-06 (2 Comments)
Solution solution by Charlie (2011-12-06 12:36:00)
Difficulty: 2 of 5Under Two Power Divides Product (in Just Math)
Posted on 2011-12-05 (8 Comments)
re(2): analytic solution and computer solution by Charlie (2011-12-06 01:47:49)
Solution analytic solution and computer solution by Charlie (2011-12-05 13:33:44)
Difficulty: 3 of 5Under Don't try this barefoot. (in Probability)
Posted on 2011-12-01 (3 Comments)
Solution computer-assisted solution by Charlie (2011-12-01 13:32:42)
Difficulty: 2 of 5Under Four people (in Liars and Knights)
Posted on 2011-11-28 (3 Comments)
Solution Nobody answered this yet??? by Charlie (2011-11-29 00:09:26)
Difficulty: 3 of 5Under To and fro (in Calculus)
Posted on 2011-11-23 (2 Comments)
Solution solution by Charlie (2011-11-23 13:09:36)
Difficulty: 2 of 5Under Point to 2011 (in Just Math)
Posted on 2011-11-22 (2 Comments)
Solution beginning of manual solution; computer solution; refinement of manual soln based on computer soln by Charlie (2011-11-22 11:52:41)
Difficulty: 2 of 5Under All in the family (in Just Math)
Posted on 2011-11-20 (17 Comments)
re(2): revised solution, for revised puzzle by Charlie (2011-11-22 12:21:55)
Solution revised solution, for revised puzzle by Charlie (2011-11-21 12:34:33)
Some Thoughts computer exploration--I'm only getting two by Charlie (2011-11-20 16:49:13)
Difficulty: 4 of 5Under Twins, triplets and more (in Just Math)
Posted on 2011-11-17 (5 Comments)
re: expanding (spoiler included) by Charlie (2011-11-17 12:57:52)
expanding (spoiler included) by Charlie (2011-11-17 12:53:04)
Solution computer solution by Charlie (2011-11-17 12:37:18)
Difficulty: 3 of 5Under Proximo Ultimo Sum (in Sequences)
Posted on 2011-11-16 (5 Comments)
Solution computer solution by Charlie (2011-11-16 14:32:25)
Difficulty: 2 of 5Under Counting triplets III (in Just Math)
Posted on 2011-11-14 (2 Comments)
Solution solution by Charlie (2011-11-14 16:07:47)
Difficulty: 3 of 5Under Angle of view - Parabola (in Geometry)
Posted on 2011-11-13 (2 Comments)
Solution partial solution by Charlie (2011-11-13 13:21:01)
Difficulty: 3 of 5Under Multiply Month and Day (in General)
Posted on 2011-11-12 (2 Comments)
Solution computer solution by Charlie (2011-11-12 18:40:03)
Difficulty: 2 of 5Under Some relation! (in Just Math)
Posted on 2011-11-11 (10 Comments)
re(6): Solution by Charlie (2011-11-13 02:55:11)
re(4): Solution by Charlie (2011-11-12 11:41:55)
Question re(2): Solution by Charlie (2011-11-11 17:34:26)
Difficulty: 3 of 5Under Momentous Multiple (in Numbers)
Posted on 2011-11-10 (2 Comments)
Solution computer solution by Charlie (2011-11-10 15:37:29)
Difficulty: 1 of 5Under Slope products (in Geometry)
Posted on 2011-11-08 (3 Comments)
Solution solution by Charlie (2011-11-08 13:03:17)
Difficulty: 3 of 5Under Power Difference (in Just Math)
Posted on 2011-11-06 (5 Comments)
Some Thoughts actually... by Charlie (2011-11-06 12:05:50)
Some Thoughts computer exploration may lead to ideas for a proof by Charlie (2011-11-06 12:01:24)
Difficulty: 3 of 5Under Power Division II (in Just Math)
Posted on 2011-11-05 (2 Comments)
Solution computer solution and start of an analytic solution by Charlie (2011-11-05 15:19:19)
Difficulty: 3 of 5Under Numbered Words (in Word Problems)
Posted on 2011-11-04 (10 Comments)
Solution computer solution by Charlie (2011-11-04 17:12:17)
Difficulty: 3 of 5Under An extended harmony (in Just Math)
Posted on 2011-11-01 (5 Comments)
Solution computer verification by Charlie (2011-11-01 12:34:22)
Difficulty: 4 of 5Under Special dice (in Just Math)
Posted on 2011-10-30 (18 Comments)
well... (possible spoiler) by Charlie (2011-10-31 14:04:13)
Solution solution by Charlie (2011-10-30 14:31:06)
Difficulty: 3 of 5Under Some digits sum square II (in Probability)
Posted on 2011-10-29 (1 Comments)
Solution computer solution by Charlie (2011-10-29 14:12:01)
Difficulty: 2 of 5Under Angle of view (in Just Math)
Posted on 2011-10-28 (2 Comments)
Solution calculus solution by Charlie (2011-10-28 13:12:55)
Difficulty: 2 of 5Under Digit addition and insertion (in Just Math)
Posted on 2011-10-27 (12 Comments)
re: answers by Charlie (2011-10-27 18:31:11)
Difficulty: 4 of 5Under Repunit Rigor (in Just Math)
Posted on 2011-10-25 (5 Comments)
Some Thoughts Wow... Is this really a D4? (spoiler--based on Google search) by Charlie (2011-10-25 12:38:22)
Some Thoughts factorizations, in case they help by Charlie (2011-10-25 11:59:02)
Difficulty: 2 of 5Under Lasts a year (in Just Math)
Posted on 2011-10-24 (5 Comments)
Solution Put another way by Charlie (2011-10-25 09:09:40)
Difficulty: 3 of 5Under Going Maximum with Geometric (in Just Math)
Posted on 2011-10-21 (4 Comments)
Solution computer solution--spoiler by Charlie (2011-10-21 15:09:42)
Difficulty: 2 of 5Under Slow growing sequence (in Sequences)
Posted on 2011-10-20 (1 Comments)
Solution computer exploration and solution by Charlie (2011-10-20 12:47:42)
Difficulty: 3 of 5Under Last three digits (in Just Math)
Posted on 2011-10-19 (9 Comments)
Solution with a computer program by Charlie (2011-10-19 14:46:38)
Difficulty: 3 of 5Under Salsa-metics (in Numbers)
Posted on 2011-10-16 (3 Comments)
Solution Computer solution by Charlie (2011-10-16 13:02:21)
Difficulty: 4 of 5Under Avoid ambiguity (in General)
Posted on 2011-10-12 (2 Comments)
Solution computer solution by Charlie (2011-10-12 14:59:56)
Difficulty: 3 of 5Under Triangular Polygons II (in Probability)
Posted on 2011-10-11 (2 Comments)
Solution table by Charlie (2011-10-11 15:27:06)
Solution solution by Charlie (2011-10-11 12:28:02)
Difficulty: 4 of 5Under Double Word Square Challenge (in Word Problems)
Posted on 2011-10-07 (2 Comments)
Solution 4x4 case using a computer program by Charlie (2011-10-08 01:40:50)
Difficulty: 3 of 5Under 2011 Square End (in Just Math)
Posted on 2011-10-06 (3 Comments)
Solution computer solution by Charlie (2011-10-06 14:16:03)
Difficulty: 4 of 5Under RARE SURE QUORA (in Just Math)
Posted on 2011-10-02 (8 Comments)
Question Is there a bug in my program? by Charlie (2011-10-03 10:38:56)
Difficulty: 3 of 5Under Myriad Factorial Digit (in Just Math)
Posted on 2011-10-01 (7 Comments)
Solution now for the computer solution to the right problem by Charlie (2011-10-02 14:09:04)
Solution computer solution by Charlie (2011-10-01 18:32:17)
Difficulty: 3 of 5Under Divisible (in Sequences)
Posted on 2011-09-30 (6 Comments)
re: Eureka! (spoiler) by Charlie (2011-10-01 00:27:24)
Difficulty: 2 of 5Under Surf City Semiprimes (in Numbers)
Posted on 2011-09-27 (4 Comments)
Solution proof by Charlie (2011-09-27 16:55:12)
Difficulty: 3 of 5Under Square Concatenation (in Numbers)
Posted on 2011-09-25 (2 Comments)
Solution computer solution by Charlie (2011-09-25 16:24:27)
Difficulty: 3 of 5Under Powering Up the Root (in Calculus)
Posted on 2011-09-24 (3 Comments)
Solution computer solution by Charlie (2011-09-24 14:57:05)
Difficulty: 3 of 5Under 1000 ways (in Numbers)
Posted on 2011-09-23 (5 Comments)
Hints/Tips Making inside info public: Hint (credit to Jer) by Charlie (2011-09-23 22:16:00)
Difficulty: 2 of 5Under Duodecimal Digits (in Just Math)
Posted on 2011-09-22 (5 Comments)
re: heuristic computer exploration -- no proof by Charlie (2011-09-22 21:38:05)
Solution heuristic computer exploration -- no proof by Charlie (2011-09-22 15:21:02)
Difficulty: 3 of 5Under Sum Month and Day II (in General)
Posted on 2011-09-20 (4 Comments)
Solution categorized by Charlie (2011-09-20 22:21:01)
Difficulty: 2 of 5Under Q: What time is it now, dear R.? (in Just Math)
Posted on 2011-09-19 (9 Comments)
Solution solution by Charlie (2011-09-19 15:09:54)
Difficulty: 3 of 5Under HeaRT OF VENUS (in Numbers)
Posted on 2011-09-18 (3 Comments)
Solution computer solution by Charlie (2011-09-18 17:01:49)
Difficulty: 3 of 5Under 2011 Square Start (in Just Math)
Posted on 2011-09-16 (5 Comments)
Solution solution by Charlie (2011-09-16 13:48:37)
Difficulty: 3 of 5Under 1st+2nd=3rd (in Numbers)
Posted on 2011-09-14 (3 Comments)
Solution computer solution by Charlie (2011-09-14 16:34:35)
Difficulty: 3 of 5Under Lucky seven V (in Just Math)
Posted on 2011-09-13 (3 Comments)
Solution computer solution by Charlie (2011-09-13 13:41:33)
Difficulty: 4 of 5Under 12 ways (in Numbers)
Posted on 2011-09-08 (4 Comments)
Solution computer solution by Charlie (2011-09-08 11:59:17)
Difficulty: 3 of 5Under Electric Rabbits (in Sequences)
Posted on 2011-09-07 (2 Comments)
Solution solution (spoiler) by Charlie (2011-09-07 15:30:43)
Difficulty: 3 of 5Under Catering to sportsmen's whims (in Numbers)
Posted on 2011-09-04 (4 Comments)
which poses the question... (spoiler--includes recaps of solutions) by Charlie (2011-09-04 13:44:14)
Solution solution by Charlie (2011-09-04 13:28:34)
Difficulty: 3 of 5Under Squaring Up The Digits II (in Just Math)
Posted on 2011-09-03 (7 Comments)
Solution computer solution by Charlie (2011-09-03 14:56:00)
Difficulty: 4 of 5Under Melting the ice (in General)
Posted on 2011-09-01 (12 Comments)
Solution all solutons (computer) by Charlie (2011-09-01 17:50:10)
Difficulty: 3 of 5Under Abjad Analysis (in Word Problems)
Posted on 2011-08-31 (6 Comments)
Solution Full list -- (spoiler) by Charlie (2011-09-01 13:40:42)
re(2): L by Charlie (2011-09-01 02:29:34)
Solution exactly one by Charlie (2011-08-31 16:28:47)
Difficulty: 3 of 5Under Tribonacci Travail (in Sequences)
Posted on 2011-08-30 (1 Comments)
Solution computer solution by Charlie (2011-08-30 14:43:28)
Difficulty: 2 of 5Under It is not hard (in Word Problems)
Posted on 2011-08-29 (8 Comments)
Some Thoughts The only way I can see it... by Charlie (2011-08-29 16:38:18)
Difficulty: 3 of 5Under Sum of cubes and squares (in Just Math)
Posted on 2011-08-28 (2 Comments)
Solution computer solution by Charlie (2011-08-28 21:24:16)
Difficulty: 3 of 5Under Painted Tetrahedra (in Shapes)
Posted on 2011-08-22 (5 Comments)
re: I think .. (spoiler) by Charlie (2011-08-23 02:16:34)
Difficulty: 3 of 5Under Move the 2 - double the number II (in Just Math)
Posted on 2011-08-21 (2 Comments)
Some Thoughts computer exploration of part II (likely spoiler) by Charlie (2011-08-21 14:12:13)
Some Thoughts Part I solution by Charlie (2011-08-21 13:47:32)
Difficulty: 4 of 5Under As easy as... ABC? ...123? (in General)
Posted on 2011-08-18 (12 Comments)
re(3): One suggestion,...second to follow by Charlie (2011-08-19 23:31:53)
re(2): One suggestion,...second to follow by Charlie (2011-08-19 16:01:42)
re(2): Formable words by Charlie (2011-08-19 12:07:37)
Some Thoughts Formable words by Charlie (2011-08-19 10:19:06)
Difficulty: 2 of 5Under Divisible? Yes and No. (in Just Math)
Posted on 2011-08-15 (3 Comments)
Solution computer solution by Charlie (2011-08-16 09:10:14)
Difficulty: 3 of 5Under 59 in one way (in Numbers)
Posted on 2011-08-13 (7 Comments)
re(2): possible solution by Charlie (2011-08-14 00:14:15)
re: possible solution by Charlie (2011-08-13 17:29:51)
Difficulty: 3 of 5Under Triangular Polygons (in Probability)
Posted on 2011-08-12 (4 Comments)
Solution re(2): computer findings for triangles through 50-gons by Charlie (2011-08-14 17:21:57)
Some Thoughts re: computer findings for triangles through 50-gons by Charlie (2011-08-14 17:08:52)
Some Thoughts computer findings for triangles through 50-gons by Charlie (2011-08-14 16:58:33)
Difficulty: 1 of 5Under Wherefrom thou comest, mylady? (in Logic)
Posted on 2011-08-11 (4 Comments)
Solution The answer is... by Charlie (2011-08-11 17:46:59)
Difficulty: 2 of 5Under Rating our neighbours (in Geometry)
Posted on 2011-08-08 (2 Comments)
Solution solution and discussion by Charlie (2011-08-09 11:42:32)
Difficulty: 2 of 5Under Step Function II (in Just Math)
Posted on 2011-08-06 (2 Comments)
Solution computer solution with a high degree of confidence by Charlie (2011-08-07 12:50:30)
Difficulty: 3 of 5Under Prime Magic Square (in Numbers)
Posted on 2011-08-04 (6 Comments)
Hints/Tips hint by Charlie (2011-08-10 19:29:40)
Difficulty: 3 of 5Under Geometric Integers II (in Just Math)
Posted on 2011-08-02 (3 Comments)
re: Fibonacci by Charlie (2011-08-04 11:46:35)
Solution computer solution by Charlie (2011-08-03 18:30:22)
Difficulty: 3 of 5Under Train track shapes (in Shapes)
Posted on 2011-08-01 (2 Comments)
Some Thoughts A start, with 1 and 2 (spoilers for these), and a thought by Charlie (2011-08-01 14:00:06)
Difficulty: 3 of 5Under Counting triplets II (in Just Math)
Posted on 2011-07-30 (1 Comments)
Solution computer solution by Charlie (2011-07-30 17:42:18)
Difficulty: 2 of 5Under Squaring Up The Digits (in Numbers)
Posted on 2011-07-28 (2 Comments)
Solution computer solution by Charlie (2011-07-28 13:38:25)
Difficulty: 3 of 5Under If you don't know the words, just whistle the tune... (in Word Problems)
Posted on 2011-07-27 (7 Comments)
Some Thoughts Six of the ten by Charlie (2011-07-27 11:46:48)
Difficulty: 4 of 5Under Compare (in Just Math)
Posted on 2011-07-26 (4 Comments)
Solution solution by Charlie (2011-07-26 14:52:55)
Difficulty: 4 of 5Under Lucky seven IV (in Just Math)
Posted on 2011-07-23 (2 Comments)
Solution computer solution by Charlie (2011-07-23 13:37:14)
Difficulty: 3 of 5Under At the party (in Logic)
Posted on 2011-07-22 (2 Comments)
Solution solution by Charlie (2011-07-22 14:08:42)
Difficulty: 3 of 5Under 2011 = Sum of Squares II (in Probability)
Posted on 2011-07-19 (1 Comments)
Solution computer solution by Charlie (2011-07-19 18:47:32)
Difficulty: 3 of 5Under Superprimes (in Numbers)
Posted on 2011-07-18 (2 Comments)
Solution computer by Charlie (2011-07-18 17:48:43)
Difficulty: 4 of 5Under S-olve T-his (in Word Problems)
Posted on 2011-07-17 (4 Comments)
Solution All except R by Charlie (2011-07-17 15:51:13)
Difficulty: 3 of 5Under Prime Birthdays II (in Just Math)
Posted on 2011-07-14 (1 Comments)
Solution computer solution by Charlie (2011-07-14 13:16:36)
Difficulty: 4 of 5Under Antimagic square (in Probability)
Posted on 2011-07-12 (7 Comments)
Monte Carlo simulation of 4x4 probability by Charlie (2011-07-13 12:00:48)
re(4): computer solution ?????? by Charlie (2011-07-13 11:41:12)
re(2): computer solution by Charlie (2011-07-12 23:26:38)
re(2): computer solution by Charlie (2011-07-12 23:15:35)
Solution computer solution by Charlie (2011-07-12 16:29:00)
Difficulty: 4 of 5Under Brevity is the soul of wit (in Word Problems)
Posted on 2011-07-09 (4 Comments)
Getting started, with 1 & 2 by Charlie (2011-07-09 14:14:58)
Difficulty: 4 of 5Under Yosi will be 13 years old (in General)
Posted on 2011-07-04 (11 Comments)
re(2): possible solution by Charlie (2011-07-05 21:25:26)
Solution possible solution by Charlie (2011-07-05 04:52:03)
Difficulty: 3 of 5Under A skilfull erasure (in Just Math)
Posted on 2011-06-27 (2 Comments)
Solution computer assisted solution by Charlie (2011-06-27 16:37:01)
Difficulty: 3 of 5Under Rooting for two digits (in Probability)
Posted on 2011-06-24 (1 Comments)
Solution computer solution by Charlie (2011-06-24 17:20:33)
Difficulty: 3 of 5Under Some digits sum square (in Probability)
Posted on 2011-06-22 (2 Comments)
why stop there? by Charlie (2011-06-22 14:09:45)
Solution computer solution by Charlie (2011-06-22 13:51:00)
Difficulty: 3 of 5Under Basic Bewilderment (in Sequences)
Posted on 2011-06-19 (1 Comments)
Solution computer solution (spoiler) by Charlie (2011-06-19 13:53:26)
Difficulty: 3 of 5Under Missing Hexadecimal Digits (in Just Math)
Posted on 2011-06-18 (2 Comments)
Some Thoughts Hmmmm... (my comments, for what they're worth) by Charlie (2011-06-18 16:51:21)
Difficulty: 2 of 5Under Ratio Resolution (in Just Math)
Posted on 2011-06-15 (6 Comments)
re(3): answers only- spoiler by Charlie (2011-06-21 03:05:24)
Question re: answers only- spoiler by Charlie (2011-06-20 11:08:15)
Some Thoughts One way to do part 1 by Charlie (2011-06-15 14:26:17)
Difficulty: 3 of 5Under Samba Primes (in Numbers)
Posted on 2011-06-14 (9 Comments)
re(2): Hmmmm... computer solution (spoiler) by Charlie (2011-06-14 15:50:34)
Solution Hmmmm... computer solution (spoiler) by Charlie (2011-06-14 14:46:24)
Difficulty: 3 of 5Under Who said to whom and when? (in Cryptography)
Posted on 2011-06-13 (3 Comments)
Solution rest of the solution (spoiler) by Charlie (2011-06-13 12:36:16)
Hints/Tips computer hint by Charlie (2011-06-13 12:35:00)
Difficulty: 4 of 5Under Knights and Liars of the Round Table (in Liars and Knights)
Posted on 2011-06-10 (4 Comments)
Solution Isn't it D2? (spoiler) by Charlie (2011-06-10 13:15:51)
Difficulty: 4 of 5Under Decode the double code (in Just Math)
Posted on 2011-06-09 (7 Comments)
re(2): computer solutons (spoilers) by Charlie (2011-06-09 18:08:48)
Solution computer solutons (spoilers) by Charlie (2011-06-09 13:59:52)
Difficulty: 4 of 5Under Antonymic Laddergrams (in Word Problems)
Posted on 2011-06-08 (6 Comments)
re: No Subject -- improved antonym by Charlie (2011-06-08 13:36:47)
Difficulty: 3 of 5Under Interesting numbers (in Sequences)
Posted on 2011-06-07 (3 Comments)
Solution Sloaneable (spoiler) by Charlie (2011-06-07 16:43:27)
Difficulty: 3 of 5Under Missing digits (in Just Math)
Posted on 2011-06-06 (8 Comments)
Solution mostly computer solution (spoilers) by Charlie (2011-06-06 14:17:37)
Difficulty: 2 of 5Under Fortieth logs (in Just Math)
Posted on 2011-05-31 (15 Comments)
re: A start (spoiler) by Charlie (2011-05-31 14:43:51)
Difficulty: 3 of 5Under The Garden (in General)
Posted on 2011-05-30 (5 Comments)
Some Thoughts the last letters? by Charlie (2011-05-31 11:56:03)
Difficulty: 2 of 5Under Sequence of wrong means (in Sequences)
Posted on 2011-05-26 (3 Comments)
Solution apparently the solution by Charlie (2011-05-27 02:04:40)
Difficulty: 3 of 5Under Greatest Root Difference (in Probability)
Posted on 2011-05-25 (1 Comments)
Solution computer solutions by Charlie (2011-05-25 19:16:27)
Difficulty: 3 of 5Under A well-defined age (in Just Math)
Posted on 2011-05-23 (2 Comments)
Solution solution by Charlie (2011-05-23 13:59:11)
Difficulty: 2 of 5Under Successively incident (in Just Math)
Posted on 2011-05-18 (2 Comments)
Solution computer solution by Charlie (2011-05-18 17:54:40)
Difficulty: 2 of 5Under How young is he? (in Just Math)
Posted on 2011-05-16 (2 Comments)
re: solution by Charlie (2011-05-16 17:00:07)
Difficulty: 2 of 5Under A Royal Question (in Word Problems)
Posted on 2011-05-13 (2 Comments)
Solution computer solution by Charlie (2011-05-13 17:35:07)
Difficulty: 3 of 5Under Numbered Letters II (in Word Problems)
Posted on 2011-05-09 (4 Comments)
the program by Charlie (2011-05-09 14:45:34)
Solution part 2 computer list by Charlie (2011-05-09 14:43:25)
Solution part 1 computer list by Charlie (2011-05-09 14:36:33)
Difficulty: 3 of 5Under 1 penny / 1 die (in Probability)
Posted on 2011-05-06 (5 Comments)
standard deviations -- of course -- "obvious" problem by Charlie (2011-05-07 03:28:06)
re(2): some solutions, but not sure about standard deviations by Charlie (2011-05-06 17:33:19)
Solution some solutions, but not sure about standard deviations by Charlie (2011-05-06 14:12:53)
Difficulty: 3 of 5Under Counting Sextuplets (in Just Math)
Posted on 2011-05-04 (7 Comments)
Solution computer solution by Charlie (2011-05-04 19:28:28)
Difficulty: 3 of 5Under An old one (in Just Math)
Posted on 2011-05-02 (1 Comments)
Solution computer solution by Charlie (2011-05-02 15:15:38)
Difficulty: 5 of 5Under 0 9357254 (in General)
Posted on 2011-04-29 (5 Comments)
re: It doesnt seem to be a simple cryptarithm. by Charlie (2011-04-30 11:07:24)
Difficulty: 3 of 5Under Closed Closure (in Just Math)
Posted on 2011-04-28 (3 Comments)
Some Thoughts here are some numbers in case they help by Charlie (2011-04-28 11:44:18)
Difficulty: 3 of 5Under Joe's favorite number (in Liars and Knights)
Posted on 2011-04-27 (4 Comments)
Solution analytic and computer solutions by Charlie (2011-04-27 14:00:18)
Difficulty: 3 of 5Under Mod And Near Myriad (in Just Math)
Posted on 2011-04-24 (4 Comments)
re: Solution (using excel) by Charlie (2011-04-24 14:29:38)
Solution computer solution using Frink by Charlie (2011-04-24 14:28:41)
Difficulty: 4 of 5Under Limiting Ratio (in Calculus)
Posted on 2011-04-22 (3 Comments)
Solution No proof but (spoiler) ... by Charlie (2011-04-22 15:23:52)
Difficulty: 3 of 5Under Match the Numbers (in Probability)
Posted on 2011-04-07 (2 Comments)
Solution re: computer solution -- listing continued by Charlie (2011-04-07 16:04:26)
Solution computer solution by Charlie (2011-04-07 16:01:38)
Difficulty: 3 of 5Under The Voyage of the Mako (in General)
Posted on 2011-04-05 (14 Comments)
re(4): An example of one solution by Charlie (2011-04-08 02:39:05)
Some Thoughts an attempt at a solution by Charlie (2011-04-06 14:50:41)
Difficulty: 3 of 5Under Shrinkable numbers (in Numbers)
Posted on 2011-04-05 (3 Comments)
Solution computer solution by Charlie (2011-04-05 18:18:26)
Solution re: answer by Charlie (2011-04-05 18:13:00)
Difficulty: 1 of 5Under Almost equal (in Just Math)
Posted on 2011-04-01 (10 Comments)
Question Can you really.... by Charlie (2011-04-01 23:22:11)
Difficulty: 3 of 5Under Back to the base (in Numbers)
Posted on 2011-03-30 (3 Comments)
Solution computer solution (spoiler) by Charlie (2011-03-30 13:02:15)
Difficulty: 3 of 5Under Powerful Digit (in Probability)
Posted on 2011-03-29 (12 Comments)
re(3): answers by Charlie (2011-03-30 14:20:40)
re(2): part (1) not so hard after all (spoiler) by Charlie (2011-03-30 10:57:13)
Question re: An attempt as (3), but it looks wrong according to simulation by Charlie (2011-03-30 09:57:59)
Some Thoughts re: answers by Charlie (2011-03-30 09:56:27)
Some Thoughts An attempt as (3), but it looks wrong according to simulation by Charlie (2011-03-29 22:27:42)
Some Thoughts part (1) not so hard after all (spoiler) by Charlie (2011-03-29 17:31:49)
Some Thoughts part (2) -- the easy one (spoiler for this part) by Charlie (2011-03-29 17:03:54)
Difficulty: 3 of 5Under Celebrity Squares (in Numbers)
Posted on 2011-03-29 (2 Comments)
Solution computer solution (spoiler) by Charlie (2011-03-29 15:44:16)
Difficulty: 3 of 5Under Factorial Difference = Perfect Square (in Just Math)
Posted on 2011-03-28 (3 Comments)
re: possible pairs by Charlie (2011-03-28 14:29:09)
Difficulty: 4 of 5Under Factor numbers (in Just Math)
Posted on 2011-03-26 (5 Comments)
Solution computer solution by Charlie (2011-03-26 14:29:58)
Difficulty: 3 of 5Under 2011 Powered Digits (in Just Math)
Posted on 2011-03-25 (5 Comments)
re: spoiler- I don't know how you'd get this analytically by Charlie (2011-03-25 22:22:32)
Solution spoiler- I don't know how you'd get this analytically by Charlie (2011-03-25 22:17:42)
Difficulty: 3 of 5Under Numerous Numeral Enumeration (in Just Math)
Posted on 2011-03-20 (10 Comments)
re(2): Solution of simple problem by Charlie (2011-03-21 17:20:28)
re: Solution of simple problem by Charlie (2011-03-21 17:07:00)
re(3): Initial thoughts. by Charlie (2011-03-21 16:07:35)
Some Thoughts re: Initial thoughts. by Charlie (2011-03-21 10:37:04)
Some Thoughts seems harder than it looks initially by Charlie (2011-03-20 12:44:51)
Difficulty: 3 of 5Under My stock (in Numbers)
Posted on 2011-03-19 (5 Comments)
Solution computer solution by Charlie (2011-03-19 14:04:18)
Difficulty: 3 of 5Under Prime times (in Numbers)
Posted on 2011-03-18 (2 Comments)
Solution computer solution by Charlie (2011-03-18 12:55:09)
Difficulty: 3 of 5Under By Jove, we're leaving (I think)! (in Liars and Knights)
Posted on 2011-03-17 (3 Comments)
Solution computer solution (spoiler) by Charlie (2011-03-18 01:49:03)
Difficulty: 3 of 5Under So many quintuplets... (in Just Math)
Posted on 2011-03-17 (3 Comments)
Solution solution by Charlie (2011-03-17 13:31:16)
Difficulty: 3 of 5Under Powerful Couple (in Probability)
Posted on 2011-03-16 (6 Comments)
re(3): exploration turned up something strange by Charlie (2011-03-17 15:29:19)
Question re: exploration turned up something strange by Charlie (2011-03-16 15:41:49)
Solution computer solution using Frink (spoiler) by Charlie (2011-03-16 13:08:32)
Difficulty: 4 of 5Under Domino Polygons (in Probability)
Posted on 2011-03-14 (5 Comments)
Some Thoughts Getting started: triangle case only by Charlie (2011-03-14 16:48:10)
Difficulty: 4 of 5Under Neither 3 nor 6 (in Just Math)
Posted on 2011-03-11 (6 Comments)
re(3): Part a only (spoiler) by Charlie (2011-03-14 17:38:34)
re: Part a only (spoiler) by Charlie (2011-03-11 16:32:42)
re: Part a only (spoiler) by Charlie (2011-03-11 13:54:36)
Hints/Tips Part a only (spoiler) by Charlie (2011-03-11 13:42:19)
Difficulty: 3 of 5Under Time sequence (in Sequences)
Posted on 2011-03-10 (1 Comments)
Solution solution by Charlie (2011-03-11 02:23:30)
Difficulty: 3 of 5Under Hill Numbers Settlement II (in Probability)
Posted on 2011-03-09 (5 Comments)
re: answer by Charlie (2011-03-10 11:48:35)
Solution solution by Charlie (2011-03-09 15:10:32)
Difficulty: 3 of 5Under Two happy ends (in Just Math)
Posted on 2011-03-07 (11 Comments)
How the numbers get there by Charlie (2011-03-09 15:39:48)
re(6): NOT enough by Gamer by Charlie (2011-03-09 15:20:18)
Solution solution by Charlie (2011-03-07 15:15:40)
Difficulty: 3 of 5Under Prime = Sqrt of Summed Primes (in Numbers)
Posted on 2011-03-06 (6 Comments)
re(2): computer solutionS (spoiler)MISSING by Charlie (2011-03-07 11:23:02)
Solution computer solution (spoiler) by Charlie (2011-03-06 18:09:43)
Difficulty: 5 of 5Under How far can you go? (in Numbers)
Posted on 2011-03-04 (11 Comments)
re: Smarandache-Wellin numbers? by Charlie (2011-03-05 21:29:12)
Solution solution by Charlie (2011-03-04 21:00:19)
re: and with 3 by Charlie (2011-03-04 16:32:54)
Difficulty: 4 of 5Under Who`s on the right base? (in Numbers)
Posted on 2011-03-03 (1 Comments)
Solution solution by Charlie (2011-03-04 01:10:35)
Difficulty: 2 of 5Under Solitary Solution Settlement (in Numbers)
Posted on 2011-03-02 (4 Comments)
re: No Subject by Charlie (2011-03-02 15:33:12)
Difficulty: 3 of 5Under Three W answers (in Numbers)
Posted on 2011-02-27 (6 Comments)
Solution re(2): Prelim by Charlie (2011-02-28 11:32:38)
Difficulty: 3 of 5Under Get the last digit II (in Numbers)
Posted on 2011-02-23 (4 Comments)
Solution solution by Charlie (2011-02-23 20:57:50)
Difficulty: 4 of 5Under EVEN remains even (in Numbers)
Posted on 2011-02-20 (2 Comments)
Solution computer solution by Charlie (2011-02-20 16:33:02)
Difficulty: 3 of 5Under a) is easy, b) is not (in Just Math)
Posted on 2011-02-18 (8 Comments)
Solution 2 computer ways by Charlie (2011-02-18 18:39:55)
Difficulty: 2 of 5Under Factorial zeros (in Numbers)
Posted on 2011-02-17 (4 Comments)
Solution Exploration and an attempt at proof. by Charlie (2011-02-17 20:39:20)
Difficulty: 2 of 5Under A fun prime number (in Numbers)
Posted on 2011-02-15 (4 Comments)
Solution solution (spoiler) by Charlie (2011-02-15 19:12:02)
Difficulty: 2 of 5Under How would you bet? (in Probability)
Posted on 2011-02-13 (2 Comments)
re: computer solution -- how to produce the given digits by Charlie (2011-02-14 11:15:24)
Solution computer solution by Charlie (2011-02-14 01:36:48)
Difficulty: 3 of 5Under Q^2 + R = 1977 (in Just Math)
Posted on 2011-02-08 (7 Comments)
re(3): Supplementary questions by Charlie (2011-02-12 13:11:07)
re: Supplementary questions by Charlie (2011-02-09 11:52:58)
regarding the supplementary questions by Charlie (2011-02-08 22:32:00)
Solution computer solutions by Charlie (2011-02-08 22:24:14)
Difficulty: 3 of 5Under A small difference (in Just Math)
Posted on 2011-02-07 (2 Comments)
Some Thoughts Exploration--no proof by Charlie (2011-02-07 14:35:47)
Difficulty: 3 of 5Under Counting Quadruplets III (in Just Math)
Posted on 2011-02-06 (6 Comments)
re(3): computer solution ... Do me a favor , Charlie by Charlie (2011-02-07 14:15:35)
re(2): computer solution ... Do me a favor , Charlie by Charlie (2011-02-07 12:30:22)
re(2): computer solution ... Do me a favor , Charlie by Charlie (2011-02-07 12:20:15)
Solution computer solution by Charlie (2011-02-06 17:36:56)
Difficulty: 3 of 5Under Powered Greatest Root (in Sequences)
Posted on 2011-02-03 (4 Comments)
Solution solution via research and quad formula, with a fudge for n=1 by Charlie (2011-02-03 14:57:31)
re: Question? by Charlie (2011-02-03 14:01:57)
Difficulty: 3 of 5Under 241 (in Just Math)
Posted on 2011-02-02 (4 Comments)
Solution solutions by Charlie (2011-02-02 14:40:24)
Difficulty: 3 of 5Under Forty- niners (in Numbers)
Posted on 2011-02-01 (7 Comments)
re: solution? by Charlie (2011-02-01 16:15:47)
Difficulty: 4 of 5Under SQUARECOMPASS (in Geometry)
Posted on 2011-01-30 (4 Comments)
re(2): solution by Charlie (2011-01-31 10:20:10)
Solution solution by Charlie (2011-01-30 20:03:38)
Difficulty: 3 of 5Under Flipping Even-Odd (in Probability)
Posted on 2011-01-28 (3 Comments)
Solution solution detailed by computer by Charlie (2011-01-29 15:45:03)
Solution computer solution by Charlie (2011-01-28 18:15:08)
Difficulty: 3 of 5Under (sod(x))^2 = x+2 (in Probability)
Posted on 2011-01-26 (3 Comments)
Solution solution using QuickBasic by Charlie (2011-01-26 15:37:33)
Difficulty: 3 of 5Under Don't lose too fast (in Probability)
Posted on 2011-01-25 (5 Comments)
re: Hmm. Good strategy. by Charlie (2011-01-25 15:40:17)
Solution computer solution by Charlie (2011-01-25 15:30:27)
Difficulty: 3 of 5Under Just P&P (in Numbers)
Posted on 2011-01-23 (6 Comments)
Some Thoughts just a digression (though spoiler is present) by Charlie (2011-01-23 12:33:48)
Difficulty: 3 of 5Under Numerator Divisibility Nuance (in Just Math)
Posted on 2011-01-22 (4 Comments)
Solution brute force by Charlie (2011-01-22 15:51:32)
Difficulty: 3 of 5Under A binary enigma (in Games)
Posted on 2011-01-21 (5 Comments)
Solution computer solution by Charlie (2011-01-21 18:10:52)
Difficulty: 2 of 5Under Get the last digit (in Numbers)
Posted on 2011-01-17 (2 Comments)
Solution No Subject by Charlie (2011-01-17 18:14:02)
Difficulty: 4 of 5Under I WONDER (in Logic)
Posted on 2011-01-13 (10 Comments)
Some Thoughts re: my solution by Charlie (2011-01-13 14:24:15)
Difficulty: 3 of 5Under Greatest Root Power (in Just Math)
Posted on 2011-01-12 (1 Comments)
Some Thoughts computer exploration--no proof (spoiler) by Charlie (2011-01-12 13:09:55)
Difficulty: 3 of 5Under p^7 + q^3 = r^2 (in Numbers)
Posted on 2011-01-09 (3 Comments)
Some Thoughts re: sub-spoiler--another, via computer by Charlie (2011-01-09 18:04:51)
Difficulty: 3 of 5Under Lucky seven III (in Just Math)
Posted on 2011-01-05 (6 Comments)
Solution without the extra challenge (spoiler) by Charlie (2011-01-05 14:42:16)
Difficulty: 4 of 5Under 5 Digit Number II (in Numbers)
Posted on 2011-01-03 (4 Comments)
Solution computer solution by Charlie (2011-01-03 16:55:37)
Difficulty: 3 of 5Under Happy New Year (in Numbers)
Posted on 2011-01-01 (9 Comments)
notes on missed computer solutions by Charlie (2011-01-01 15:13:00)
re(5): best I can do -- the program for the solutions by Charlie (2011-01-01 14:47:25)
re(4): best I can do -- computer solutions involving division by Charlie (2011-01-01 14:45:42)
re(3): best I can do -- computer solutions involving multiplication by Charlie (2011-01-01 14:41:26)
re(2): best I can do -- computer findings by Charlie (2011-01-01 14:37:50)
Difficulty: 4 of 5Under Digital Combo-Lock (in Sequences)
Posted on 2010-12-30 (6 Comments)
Some Thoughts a thought by Charlie (2010-12-30 11:54:10)
Difficulty: 4 of 5Under Palindromic and Tautonymic IV (in Numbers)
Posted on 2010-12-27 (1 Comments)
Solution computer solution by Charlie (2010-12-27 16:35:06)
Difficulty: 2 of 5Under Pandigital and divisible (in Probability)
Posted on 2010-12-26 (4 Comments)
Solution computer solution by Charlie (2010-12-26 19:45:19)
Difficulty: 3 of 5Under Single or double (in Numbers)
Posted on 2010-12-24 (6 Comments)
Solution computer solution by Charlie (2010-12-24 17:29:45)
Difficulty: 3 of 5Under Duplicate Digit Determination III (in Just Math)
Posted on 2010-12-23 (1 Comments)
Solution computer solution by Charlie (2010-12-23 15:29:58)
Difficulty: 2 of 5Under Ambiguous dice (in Just Math)
Posted on 2010-12-21 (3 Comments)
Solution re(2): computer findings--now adding the ambiguity by Charlie (2010-12-23 03:33:13)
Solution computer findings--unambiguously by Charlie (2010-12-22 02:55:52)
Difficulty: 2 of 5Under Triangular Cubes II (in Probability)
Posted on 2010-12-21 (2 Comments)
re: computer solution by Charlie (2010-12-21 13:51:41)
Solution computer solution by Charlie (2010-12-21 13:48:39)
Difficulty: 3 of 5Under Around the ring (in Shapes)
Posted on 2010-12-20 (9 Comments)
re: part 1 not finished. by Charlie (2010-12-21 11:34:39)
Some Thoughts re: part 1 spoiler -- whoops by Charlie (2010-12-20 16:54:03)
Some Thoughts part 1 spoiler by Charlie (2010-12-20 16:47:39)
Difficulty: 3 of 5Under Pandigitally Powerful (in Numbers)
Posted on 2010-12-18 (3 Comments)
Solution Parts II and III spoilers by Charlie (2010-12-18 17:15:35)
Some Thoughts Getting started, with part (I) (spoiler for that part) by Charlie (2010-12-18 13:35:43)
Difficulty: 3 of 5Under Nine nine-digits results (in Just Math)
Posted on 2010-12-16 (1 Comments)
Solution computer solution by Charlie (2010-12-16 17:32:56)
Difficulty: 3 of 5Under Distinct Digit Determination II (in Just Math)
Posted on 2010-12-15 (2 Comments)
Solution computer solution by Charlie (2010-12-15 19:07:19)
Difficulty: 2 of 5Under Hail to thee, Sofia! (in Just Math)
Posted on 2010-12-13 (10 Comments)
re: possible method. by Charlie (2010-12-14 02:54:20)
Difficulty: 3 of 5Under Number = Power Remainder II (in Just Math)
Posted on 2010-12-12 (1 Comments)
Solution computer solution by Charlie (2010-12-13 02:29:00)
Difficulty: 4 of 5Under Seven come eleven (in Numbers)
Posted on 2010-12-11 (12 Comments)
to be hoped comments will not get wiped out by Charlie (2010-12-11 17:07:17)
7 thru 9 again by Charlie (2010-12-11 17:06:09)
re(2): for 10 digits ?????? by Charlie (2010-12-11 15:51:35)
re(2): 7 through 9 digits b I WAS BLOCKED??? by Charlie (2010-12-11 15:43:13)
for 10 digits by Charlie (2010-12-11 15:28:45)
Some Thoughts mostly computer solution for 7 through 9 digits by Charlie (2010-12-11 14:17:39)
Difficulty: 2 of 5Under Minimum perimeter length (in Geometry)
Posted on 2010-12-10 (5 Comments)
re(2): this program finds... (spoiler) by Charlie (2010-12-10 20:08:23)
Solution this program finds... (spoiler) by Charlie (2010-12-10 14:05:11)
Difficulty: 4 of 5Under A piece of pie (in Just Math)
Posted on 2010-12-07 (5 Comments)
re(2): piece of cake (solutions?) by Charlie (2010-12-07 19:32:44)
Solution computer solution by Charlie (2010-12-07 19:23:34)
re: piece of cake (solutions?) by Charlie (2010-12-07 19:20:15)
Difficulty: 3 of 5Under Multiply Sum and Sum of Squares II (in Numbers)
Posted on 2010-12-07 (1 Comments)
Solution computer search and analytic proof (spoiler) by Charlie (2010-12-07 15:18:32)
Difficulty: 3 of 5Under Elegant Exponent Exposition II (in Numbers)
Posted on 2010-12-04 (3 Comments)
re(2): computer solution for integers and primes -- now palindromes by Charlie (2010-12-04 20:06:26)
Solution re: computer solution for integers and primes -- now palindromes by Charlie (2010-12-04 19:55:33)
Some Thoughts computer solution for integers and primes by Charlie (2010-12-04 18:26:37)
Difficulty: 2 of 5Under Mother of nine (in Just Math)
Posted on 2010-12-03 (5 Comments)
Solution computer solution by Charlie (2010-12-03 15:31:22)
Difficulty: 4 of 5Under Triangulating a hexagon. (in Just Math)
Posted on 2010-11-24 (7 Comments)
Solution re(2): by my count -- proposed solution -- missed a set by Charlie (2010-11-24 19:38:15)
re(5): by my count -- proposed solution -- missed a set by Charlie (2010-11-24 18:46:18)
Question re(3): by my count -- proposed solution -- missed a set by Charlie (2010-11-24 15:20:19)
re: by my count -- proposed solution -- missed a set by Charlie (2010-11-24 13:27:42)
Some Thoughts by my count -- proposed solution by Charlie (2010-11-24 13:19:02)
Difficulty: 3 of 5Under Count them (in Numbers)
Posted on 2010-11-22 (2 Comments)
Solution computer solution by Charlie (2010-11-22 18:15:41)
Difficulty: 2 of 5Under Dudeney revisited (in Cryptography)
Posted on 2010-11-20 (2 Comments)
Solution computer solution by Charlie (2010-11-20 20:31:25)
Difficulty: 3 of 5Under srebmuN desreveR (in Just Math)
Posted on 2010-11-18 (4 Comments)
re: computer solution by Charlie (2010-11-18 22:19:48)
Solution computer solution by Charlie (2010-11-18 22:09:55)
Difficulty: 3 of 5Under Ambiguous PIN Code (in Numbers)
Posted on 2010-11-17 (9 Comments)
re(2): A Pin that works by Charlie (2010-11-19 12:01:02)
re: Possible solution -- don't consider this closed yet by Charlie (2010-11-17 16:30:25)
Difficulty: 3 of 5Under Angle in a square (in Geometry)
Posted on 2010-11-16 (5 Comments)
re: Angle Symbol by Charlie (2010-11-17 19:00:04)
Difficulty: 4 of 5Under Rolling to score (in Probability)
Posted on 2010-11-15 (17 Comments)
re(2): Solution contradicting all previous ones by Charlie (2011-04-02 17:29:27)
re: Solution contradicting all previous ones by Charlie (2011-04-02 17:17:18)
re: analytical attempt at it by Charlie (2010-11-15 18:48:45)
Solution computer-aided solution by Charlie (2010-11-15 18:33:10)
Difficulty: 3 of 5Under Three 3 digit numbers using 1-9 (in Numbers)
Posted on 2010-11-11 (3 Comments)
Solution the program to find them by Charlie (2010-11-11 18:50:28)
Difficulty: 3 of 5Under A game of coins (in Probability)
Posted on 2010-11-09 (4 Comments)
Solution solution by Charlie (2010-11-09 15:26:53)
Difficulty: 3 of 5Under Who is afraid of 7 (or 23) ? (in Numbers)
Posted on 2010-11-08 (5 Comments)
re(2): computer solution by Charlie (2010-11-09 03:00:20)
Solution computer solution by Charlie (2010-11-08 16:22:21)
Difficulty: 3 of 5Under Find Fifty (in Numbers)
Posted on 2010-11-06 (3 Comments)
re: solution by Charlie (2010-11-06 18:34:54)
Solution solution by Charlie (2010-11-06 18:31:52)
Difficulty: 4 of 5Under OOO3= one out of three (in Just Math)
Posted on 2010-11-04 (8 Comments)
re(2): solutions by Charlie (2010-11-05 10:51:40)
re: Tricks or Treats? by Charlie (2010-11-04 18:46:28)
Solution solutions by Charlie (2010-11-04 18:44:03)
Difficulty: 2 of 5Under 4x4 Grid Logic II (in Logic)
Posted on 2010-11-04 (4 Comments)
Solution a solution by Charlie (2010-11-04 11:49:43)
Difficulty: 3 of 5Under Jump, Skip and Hop (in Games)
Posted on 2010-11-03 (6 Comments)
re: Hoping or Hopping Hopefully by Charlie (2010-11-03 16:33:17)
Difficulty: 3 of 5Under Distinct Digit Determination (in Probability)
Posted on 2010-10-31 (2 Comments)
re: computer solution -- compared to random digits by Charlie (2010-10-31 14:44:13)
Solution computer solution by Charlie (2010-10-31 14:25:51)
Difficulty: 4 of 5Under Abracadabra (in Word Problems)
Posted on 2010-10-29 (3 Comments)
Solution computer exploration by Charlie (2010-10-29 17:47:21)
Difficulty: 2 of 5Under 55th in the list (in Numbers)
Posted on 2010-10-28 (6 Comments)
Solution solution by Charlie (2010-10-29 01:25:53)
Difficulty: 3 of 5Under Pretty Potent Primes IV (in Numbers)
Posted on 2010-10-26 (2 Comments)
Some Thoughts candidate for part 1 by Charlie (2010-10-26 17:59:58)
Difficulty: 3 of 5Under 5 conditions to get 2 results (in Just Math)
Posted on 2010-10-21 (3 Comments)
Solution computer solution by Charlie (2010-10-21 23:40:50)
Difficulty: 4 of 5Under Big, super and prime (in Numbers)
Posted on 2010-10-20 (8 Comments)
Question re(3): Another method. -- solution for that Euler problem 37 by Charlie (2010-10-21 11:41:36)
re(2): Another method. -- solution for that Euler problem 37 by Charlie (2010-10-20 15:18:20)
Solution Basic programming solution by Charlie (2010-10-20 14:17:12)
Difficulty: 3 of 5Under Delicate Divisibility (in Probability)
Posted on 2010-10-19 (7 Comments)
re: ABACADABrA (Solution) by Charlie (2010-10-19 19:12:46)
Solution by computer by Charlie (2010-10-19 19:07:05)
Difficulty: 2 of 5Under Alphabet Repeat Pattern Poser (in Sequences)
Posted on 2010-10-18 (3 Comments)
Solution solution by Charlie (2010-10-18 14:22:19)
Difficulty: 3 of 5Under Oodles of Factors II (in Numbers)
Posted on 2010-10-11 (8 Comments)
re: Part C by Charlie (2010-10-12 11:36:12)
Some Thoughts thoughts on part B by Charlie (2010-10-11 13:35:45)
Some Thoughts A start: solution for part A by Charlie (2010-10-11 11:48:57)
Difficulty: 3 of 5Under 3 Primes = Prime (in Numbers)
Posted on 2010-10-10 (1 Comments)
Solution computer solution by Charlie (2010-10-11 02:00:39)
Difficulty: 4 of 5Under Prime time (in Numbers)
Posted on 2010-10-08 (3 Comments)
Some Thoughts computer solution for parts 1 and 2 by Charlie (2010-10-08 15:34:46)
Difficulty: 3 of 5Under 3 Primes yield 12 (in Numbers)
Posted on 2010-10-07 (7 Comments)
re(4): computer exploration -- oh, I see a mistake in my reasoning -- solution (spoiler) by Charlie (2010-10-07 16:57:29)
Solution re(2): computer exploration -- oh, I see a mistake in my reasoning -- solution (spoiler) by Charlie (2010-10-07 13:43:44)
re: computer exploration -- oh, I see a mistake in my reasoning by Charlie (2010-10-07 13:31:58)
Some Thoughts computer exploration by Charlie (2010-10-07 13:27:55)
Difficulty: 3 of 5Under Prime-Time Ant (in Numbers)
Posted on 2010-10-05 (2 Comments)
Solution computer-aided solution by Charlie (2010-10-06 02:50:37)
Difficulty: 2 of 5Under Increase in number of factors. (in Numbers)
Posted on 2010-10-05 (5 Comments)
Solution solution by Charlie (2010-10-05 17:22:19)
Difficulty: 3 of 5Under Equal Tangents (in General)
Posted on 2010-10-03 (11 Comments)
re(3): Construction by Charlie (2010-10-05 01:05:46)
re: Does this work? by Charlie (2010-10-04 12:16:49)
re: Construction by Charlie (2010-10-04 12:05:22)
Difficulty: 3 of 5Under sod(square) - number = 2 (in Just Math)
Posted on 2010-09-27 (5 Comments)
Solution computer assisted solution by Charlie (2010-09-27 16:05:02)
Difficulty: 3 of 5Under Nineteen triplets (in Just Math)
Posted on 2010-09-23 (11 Comments)
Solution solution, I think by Charlie (2010-09-23 17:57:18)
Difficulty: 2 of 5Under 3x3 Grid Logic (in Logic)
Posted on 2010-09-23 (5 Comments)
re: Possible spoiler by Charlie (2010-09-23 16:06:20)
Difficulty: 4 of 5Under If....Then... (in Logic)
Posted on 2010-09-21 (4 Comments)
Solution computer solution in Basic by Charlie (2010-09-22 02:39:37)
Difficulty: 3 of 5Under Counting Quadruplets II (in Just Math)
Posted on 2010-09-21 (2 Comments)
Solution solution by Charlie (2010-09-21 17:36:38)
Difficulty: 3 of 5Under Primed Groups (in Numbers)
Posted on 2010-09-19 (3 Comments)
Solution computer solution by Charlie (2010-09-20 14:21:32)
Difficulty: 3 of 5Under Which multiple of 9? (in Just Math)
Posted on 2010-09-17 (8 Comments)
re: Part 2: Guess? Spoiler? by Charlie (2010-09-18 12:53:11)
re: A start: part 1 extended--D(2) thru D(55) by Charlie (2010-09-17 17:40:45)
Some Thoughts A start: part 1 extended--D(2) thru D(55) by Charlie (2010-09-17 17:28:18)
Difficulty: 3 of 5Under Profession and Average Age (in Just Math)
Posted on 2010-09-16 (2 Comments)
Solution solution by Charlie (2010-09-16 21:51:04)
Difficulty: 2 of 5Under Foundation Piece (in Cryptography)
Posted on 2010-09-16 (7 Comments)
re(4): Spoiler -- Large font. by Charlie (2010-09-17 11:06:40)
re(2): Spoiler -- Large font. by Charlie (2010-09-16 23:18:17)
Difficulty: 3 of 5Under Product = Sum + 2 (in Just Math)
Posted on 2010-09-14 (3 Comments)
re: solution by Charlie (2010-09-15 09:51:29)
Solution solution by Charlie (2010-09-14 17:28:10)
Difficulty: 2 of 5Under Slowing by snowing (in Numbers)
Posted on 2010-09-13 (6 Comments)
re(2): numerical integration by Charlie (2010-09-13 15:29:45)
Solution numerical integration by Charlie (2010-09-13 13:35:52)
Difficulty: 3 of 5Under Pandigital Divisibility (in Just Math)
Posted on 2010-09-12 (3 Comments)
Solution computer solution by Charlie (2010-09-12 14:42:04)
Difficulty: 3 of 5Under Thrice three is nine (in Numbers)
Posted on 2010-09-11 (5 Comments)
Solution computer solution by Charlie (2010-09-11 16:22:45)
Difficulty: 3 of 5Under Square and Consecutive Settlement (in Probability)
Posted on 2010-09-10 (1 Comments)
Solution computer solution by Charlie (2010-09-10 14:16:29)
Difficulty: 3 of 5Under Heiro's Wager (in Numbers)
Posted on 2010-09-08 (3 Comments)
Some Thoughts not getting far by Charlie (2010-09-08 18:39:41)
Difficulty: 2 of 5Under Tennis,anyone? (in Probability)
Posted on 2010-09-07 (7 Comments)
Solution solution by Charlie (2010-09-08 00:15:11)
Difficulty: 3 of 5Under Circles and Polygons (in Just Math)
Posted on 2010-09-05 (1 Comments)
Solution TMI (Spoiler) by Charlie (2010-09-05 14:38:52)
Difficulty: 2 of 5Under Never prime! (2) (in Numbers)
Posted on 2010-09-04 (4 Comments)
re: solution by Charlie (2010-09-05 12:14:55)
Difficulty: 2 of 5Under English and French (in Sequences)
Posted on 2010-09-01 (7 Comments)
re: Probably a Primes problem?? by Charlie (2010-09-01 14:29:05)
Difficulty: 3 of 5Under Find my password (in Word Problems)
Posted on 2010-08-31 (2 Comments)
Solution from my computer's word list by Charlie (2010-09-01 02:49:18)
Difficulty: 1 of 5Under Number of 1s (in Probability)
Posted on 2010-08-26 (2 Comments)
Solution solution by Charlie (2010-08-27 13:25:04)
Difficulty: 2 of 5Under Spelled Out Settlement (in Sequences)
Posted on 2010-08-24 (6 Comments)
Solution computer solution by Charlie (2010-08-24 13:03:37)
re: America has a by Charlie (2010-08-24 11:43:53)
Difficulty: 2 of 5Under Non-Attacking Chess Pieces II (in Games)
Posted on 2010-08-23 (7 Comments)
re: a computer solution -- transformed solution wrong by Charlie (2010-08-24 10:41:46)
Solution a computer solution by Charlie (2010-08-23 21:01:20)
Difficulty: 3 of 5Under Quite a Smithonian! (in Numbers)
Posted on 2010-08-21 (8 Comments)
re: now i c by Charlie (2010-08-24 10:44:03)
Question re: 7-up by Charlie (2010-08-22 01:32:43)
Difficulty: 3 of 5Under Counting Quadruplets (in Just Math)
Posted on 2010-08-20 (11 Comments)
Solution some thoughts; then computer solution (spoiler) by Charlie (2010-08-20 13:56:11)
Difficulty: 3 of 5Under Squares Probability III (in Just Math)
Posted on 2010-08-19 (4 Comments)
Solution re(2): solution by Charlie (2010-08-20 17:22:50)
Solution solution by Charlie (2010-08-19 21:35:01)
Difficulty: 3 of 5Under Solid triangles (3) (in Shapes)
Posted on 2010-08-18 (4 Comments)
re: a candidate by Charlie (2010-08-18 16:57:48)
Some Thoughts a candidate by Charlie (2010-08-18 16:55:12)
Difficulty: 4 of 5Under Powerful and consecutive (in Numbers)
Posted on 2010-08-09 (16 Comments)
re(2): Definition====> I beg to differ by Charlie (2010-08-11 03:07:13)
Some Thoughts computer findings by Charlie (2010-08-09 14:29:07)
re: Too many? by Charlie (2010-08-09 13:34:04)
Difficulty: 2 of 5Under Too many fours and sixes (in Numbers)
Posted on 2010-08-07 (4 Comments)
Solution computer solution and partial explanation by Charlie (2010-08-07 14:41:52)
Difficulty: 2 of 5Under 18-yes, 17-maybe (in Just Math)
Posted on 2010-08-06 (4 Comments)
Solution computer proof by Charlie (2010-08-06 13:59:53)
Difficulty: 3 of 5Under Same Mean and Median (in Numbers)
Posted on 2010-08-05 (6 Comments)
re: ? by Charlie (2010-08-06 11:46:23)
Difficulty: 2 of 5Under Flying Low (in Numbers)
Posted on 2010-08-05 (5 Comments)
Solution UBASIC solution by Charlie (2010-08-05 12:59:53)
Difficulty: 3 of 5Under At Least Three Difference (in Numbers)
Posted on 2010-08-04 (13 Comments)
re(2): Computer solution: not just for 8 by Charlie (2010-08-04 15:36:45)
Solution Computer solution: not just for 8 by Charlie (2010-08-04 13:56:24)
Difficulty: 4 of 5Under Ramanujan enforced. (in Numbers)
Posted on 2010-08-02 (5 Comments)
re: computer solution by Charlie (2010-08-02 16:08:54)
Solution computer solution by Charlie (2010-08-02 16:03:48)
Difficulty: 3 of 5Under (x!+1)/(x+1) = prime number (in Probability)
Posted on 2010-07-30 (9 Comments)
re(2): computer can't go that high by Charlie (2010-07-30 18:17:40)
Some Thoughts computer can't go that high by Charlie (2010-07-30 12:44:52)
Difficulty: 3 of 5Under Cut Cuboid = Elliptic Cone (in Shapes)
Posted on 2010-07-27 (2 Comments)
Solution Inside, damaged and outside. by Charlie (2010-07-28 12:04:51)
Solution solution by Charlie (2010-07-27 20:13:14)
Difficulty: 3 of 5Under String Theory...not quite (in Numbers)
Posted on 2010-07-27 (6 Comments)
Solution computer solution by Charlie (2010-07-27 13:59:29)
Difficulty: 2 of 5Under Three Skill Settlement (in Just Math)
Posted on 2010-07-26 (7 Comments)
re: What am I missing? (spoiler?) by Charlie (2010-07-26 14:09:01)
solution by Charlie (2010-07-26 14:03:45)
Difficulty: 3 of 5Under Sum Celebrity Concerns (in Numbers)
Posted on 2010-07-25 (9 Comments)
Some Thoughts computer solution part 2 by Charlie (2010-07-25 13:54:53)
Some Thoughts computer solution for part 1 by Charlie (2010-07-25 13:14:22)
Difficulty: 4 of 5Under POWER CHAIN. (in Sequences)
Posted on 2010-07-22 (7 Comments)
Some Thoughts computer results by Charlie (2010-07-22 16:13:40)
Difficulty: 2 of 5Under Triangular Trial (in Just Math)
Posted on 2010-07-20 (2 Comments)
Solution computer solution by Charlie (2010-07-20 13:50:02)
Difficulty: 3 of 5Under Three Lock Box (in Geometry)
Posted on 2010-07-19 (4 Comments)
Solution solution by Charlie (2010-07-19 16:13:53)
Difficulty: 3 of 5Under On the Brink Of Elimination (in Probability)
Posted on 2010-07-16 (6 Comments)
re: Solution by Charlie (2010-07-19 12:14:51)
Solution solution by Charlie (2010-07-16 13:35:03)
Difficulty: 2 of 5Under Make A Fib (in Just Math)
Posted on 2010-07-09 (8 Comments)
re: Solution by Charlie (2010-07-10 03:26:55)
re: Solution by Charlie (2010-07-10 02:54:03)
Difficulty: 4 of 5Under Another Square (in Numbers)
Posted on 2010-07-06 (9 Comments)
re(4): Solution (as interpreted) by Charlie (2010-07-07 11:50:06)
Solution re: computer solution ... the part that got cut off by Charlie (2010-07-06 23:53:50)
Solution computer solution by Charlie (2010-07-06 23:51:33)
re: Solution (as interpreted) by Charlie (2010-07-06 18:08:09)
Difficulty: 2 of 5Under A rare event (in Numbers)
Posted on 2010-07-03 (3 Comments)
re: What IT is (parts 1 and 2) (spoiler) by Charlie (2010-07-03 16:20:22)
Difficulty: 3 of 5Under Triangle from Two Lines (in Geometry)
Posted on 2010-07-01 (2 Comments)
part 1 solution by Charlie (2010-07-01 12:47:30)
Difficulty: 3 of 5Under Magma et al. (in Word Problems)
Posted on 2010-06-30 (10 Comments)
Solution From the computer by Charlie (2010-06-30 13:23:52)
Difficulty: 3 of 5Under Inscribed circle and Line Choice (in Just Math)
Posted on 2010-06-27 (3 Comments)
Solution start of analysis; computer finish (spoiler) by Charlie (2010-06-27 19:43:50)
Difficulty: 3 of 5Under Mr. Markov plays cards (in Probability)
Posted on 2010-06-26 (1 Comments)
Solution solution by Charlie (2010-06-26 14:58:43)
Difficulty: 4 of 5Under Lucky seven II (in Just Math)
Posted on 2010-06-23 (2 Comments)
Solution extra challenge not taken (spoiler) by Charlie (2010-06-23 12:26:17)
Difficulty: 2 of 5Under Number = Sum (Digit)*Product (Digit) (in Numbers)
Posted on 2010-06-21 (10 Comments)
re: No Subject by Charlie (2010-06-21 23:20:08)
re: Count em up! by Charlie (2010-06-21 16:32:42)
Solution re: Solution & thoughts by Charlie (2010-06-21 14:22:24)
Difficulty: 2 of 5Under Prime and Divisors Derivation (in Just Math)
Posted on 2010-06-17 (3 Comments)
Solution computer solution by Charlie (2010-06-17 13:42:21)
Difficulty: 3 of 5Under Product Digit Poser (in Numbers)
Posted on 2010-06-13 (5 Comments)
Hints/Tips post-solution hint (no spoiler) by Charlie (2010-06-13 14:45:57)
Solution computer solution (spoiler) by Charlie (2010-06-13 14:43:10)
Difficulty: 2 of 5Under Goldbach revisited (in Numbers)
Posted on 2010-06-12 (4 Comments)
re: computer solution (spoiler) by Charlie (2010-06-12 17:02:05)
Solution computer solution (spoiler) by Charlie (2010-06-12 15:44:56)
Difficulty: 1 of 5Under A Magic Die (in Probability)
Posted on 2010-06-10 (8 Comments)
re: analytical solution by Charlie (2010-06-10 12:47:59)
Difficulty: 4 of 5Under Russian Roulette (in Probability)
Posted on 2010-06-08 (13 Comments)
Solution Exact solution by Charlie (2010-06-09 14:22:27)
Solution "Exact" solution by Charlie (2010-06-09 01:51:32)
Some Thoughts simulation results by Charlie (2010-06-08 14:14:29)
re: Restarting the Cold War?? by Charlie (2010-06-08 13:14:02)
Difficulty: 2 of 5Under Sum (Pair Product) - Sum = 21 (in Just Math)
Posted on 2010-06-07 (4 Comments)
Solution overkill solution by Charlie (2010-06-07 13:19:11)
Difficulty: 1 of 5Under Smokey's Smokes (in Probability)
Posted on 2010-06-03 (6 Comments)
Solution re: solution by Charlie (2010-06-03 14:15:35)
Difficulty: 3 of 5Under Sliced Cube = Square Pyramid (in Shapes)
Posted on 2010-06-02 (6 Comments)
Solution solution by Charlie (2010-06-02 14:12:35)
Difficulty: 4 of 5Under The top nine at Solvemall Classic (in Logic)
Posted on 2010-06-01 (11 Comments)
re(8): computer (spoiler) by Charlie (2010-06-03 11:33:35)
re(6): computer (spoiler) by Charlie (2010-06-02 14:54:47)
re(4): computer by Charlie (2010-06-02 11:11:22)
Question re(2): computer by Charlie (2010-06-02 03:32:19)
Some Thoughts computer "solution"? by Charlie (2010-06-01 18:30:08)
Difficulty: 2 of 5Under 50 - Digit Number II (in Just Math)
Posted on 2010-05-29 (9 Comments)
re: analytical solution by Charlie (2010-05-29 16:02:11)
Solution Solution by Charlie (2010-05-29 15:57:08)
Difficulty: 3 of 5Under eight*two = sixteen (in Numbers)
Posted on 2010-05-27 (2 Comments)
Solution re: computer solution by Charlie (2010-05-28 18:58:09)
Solution computer solution by Charlie (2010-05-28 12:55:30)
Difficulty: 4 of 5Under Cover the Circumference (in Geometry)
Posted on 2010-05-25 (4 Comments)
Some Thoughts GSP approximation by Charlie (2010-05-25 13:59:04)
Difficulty: 3 of 5Under Modified Product = Sum (in Just Math)
Posted on 2010-05-24 (2 Comments)
Solution computer solution + proof by Charlie (2010-05-24 13:44:42)
Difficulty: 4 of 5Under Odd primes never die (in Numbers)
Posted on 2010-05-20 (11 Comments)
Some Thoughts Is this it? by Charlie (2010-05-20 22:44:12)
Difficulty: 2 of 5Under Known and Unknown Balls (in Probability)
Posted on 2010-05-19 (4 Comments)
Solution solution (spoiler) by Charlie (2010-05-19 13:29:27)
Difficulty: 3 of 5Under Primed to Magic (in Numbers)
Posted on 2010-05-18 (4 Comments)
Solution computer solution by Charlie (2010-05-18 17:52:21)
Difficulty: 3 of 5Under Committee Choice Concern (in Just Math)
Posted on 2010-05-17 (3 Comments)
Solution Solution by Charlie (2010-05-17 14:51:59)
Difficulty: 3 of 5Under Let's count (in Numbers)
Posted on 2010-05-16 (3 Comments)
Solution solution (spoiler) by Charlie (2010-05-16 12:45:42)
Difficulty: 2 of 5Under Sum Squares = 2009 Subtraction (in Just Math)
Posted on 2010-05-09 (3 Comments)
Solution computer solution -- and computer language speeds by Charlie (2010-05-09 14:16:40)
Difficulty: 3 of 5Under Wins 2 - wins all (in Probability)
Posted on 2010-05-06 (5 Comments)
Solution solution by Charlie (2010-05-06 13:46:30)
Difficulty: 5 of 5Under Simple properties of reflections in ellipse. (in Geometry)
Posted on 2010-05-05 (5 Comments)
re: Question. by Charlie (2010-05-06 11:15:49)
Difficulty: 4 of 5Under Up and up (in Numbers)
Posted on 2010-05-04 (2 Comments)
Solution solution by Charlie (2010-05-04 17:32:31)
Difficulty: 4 of 5Under 2*P + 2 = Perfect Square? (in Just Math)
Posted on 2010-05-01 (5 Comments)
Some Thoughts a computerized start but no proof and too small a sample size by Charlie (2010-05-01 16:12:05)
Difficulty: 3 of 5Under Sum Square Grid Row & Column ≠ 0 (in Numbers)
Posted on 2010-04-29 (6 Comments)
re(2): Solution - (MS Word Formatting!?) by Charlie (2010-04-30 02:17:37)
Difficulty: 3 of 5Under Back to the Wall (in Numbers)
Posted on 2010-04-28 (17 Comments)
re: Impossibility by Charlie (2010-05-01 13:26:15)
re: If rectangle sums only of counters... by Charlie (2010-04-30 03:21:39)
Solution re(4): Misinterpretation -- listing continued by Charlie (2010-04-30 03:17:16)
Solution re(3): Misinterpretation -- listing continued by Charlie (2010-04-30 03:16:09)
Solution re(2): Misinterpretation -- listing continued by Charlie (2010-04-30 03:14:39)
Solution re: Misinterpretation by Charlie (2010-04-30 03:13:18)
re(2): computer solution -- the program by Charlie (2010-04-28 13:53:06)
Solution re: computer solution -- the part that got cut off by Charlie (2010-04-28 13:51:48)
Solution computer solution by Charlie (2010-04-28 13:49:45)
Difficulty: 2 of 5Under Power Pattern Poser (in Sequences)
Posted on 2010-04-27 (3 Comments)
Solution solution by Charlie (2010-04-27 18:19:11)
Difficulty: 3 of 5Under All the colors in (in Probability)
Posted on 2010-04-26 (22 Comments)
re: Solution by Charlie (2010-04-28 11:12:54)
Solution solution by Charlie (2010-04-26 13:50:11)
Difficulty: 4 of 5Under Triangle inscribed in a triangle with smallest perimeter. (in Geometry)
Posted on 2010-04-25 (3 Comments)
re: Question. by Charlie (2010-05-06 11:18:09)
Difficulty: 3 of 5Under (7N-1 – 1)/N = Perfect Square (in Just Math)
Posted on 2010-04-24 (2 Comments)
Some Thoughts computer exploration by Charlie (2010-04-24 13:43:39)
Difficulty: 4 of 5Under Choose your neighbor (in Numbers)
Posted on 2010-04-23 (3 Comments)
Solution semi-analytic solution by Charlie (2010-04-23 14:06:46)
Difficulty: 3 of 5Under Choose To Prime Poser (in Just Math)
Posted on 2010-04-18 (4 Comments)
Hints/Tips computer exploration (spoilers) possible solution by Charlie (2010-04-18 13:45:26)
Difficulty: 2 of 5Under Raise Aries (in Numbers)
Posted on 2010-04-16 (3 Comments)
Solution computer solution by Charlie (2010-04-16 16:35:41)
Difficulty: 3 of 5Under Pretty Potent Primes III (in Numbers)
Posted on 2010-04-14 (1 Comments)
Solution computer solution by Charlie (2010-04-14 18:13:09)
Difficulty: 2 of 5Under (p+5)/8 and (p+1)/4 = Prime Numbers (in Just Math)
Posted on 2010-04-12 (5 Comments)
re: Analytical solution by Charlie (2010-04-13 11:35:59)
Some Thoughts computer exploration (spoilers) by Charlie (2010-04-12 12:27:00)
Difficulty: 3 of 5Under Four or else (in Numbers)
Posted on 2010-04-11 (10 Comments)
re(2): computer solution -- corrected by Charlie (2010-04-12 12:19:33)
Solution re: computer solution -- corrected by Charlie (2010-04-12 12:10:17)
re(2): Only Base 10 - conflicting values by Charlie (2010-04-11 23:38:36)
Solution computer solution by Charlie (2010-04-11 22:33:28)
Difficulty: 3 of 5Under Sum Square Roots ≤ Real Number (in Just Math)
Posted on 2010-04-10 (4 Comments)
Some Thoughts re: by graphing -- more thoughts by Charlie (2010-04-10 16:04:00)
Some Thoughts by graphing by Charlie (2010-04-10 15:56:00)
Difficulty: 3 of 5Under Twelve Divisor Trial (in Probability)
Posted on 2010-04-09 (7 Comments)
Solution solution by Charlie (2010-04-09 16:27:06)
Difficulty: 3 of 5Under Halfway Split2 (in Cryptography)
Posted on 2010-04-08 (3 Comments)
Some Thoughts re: Hint- partial solution by Charlie (2010-05-03 02:47:45)
Difficulty: 2 of 5Under Mountain Motif (in Probability)
Posted on 2010-04-07 (8 Comments)
re: my way by Charlie (2010-04-08 12:10:06)
Solution solution by Charlie (2010-04-07 11:44:17)
Difficulty: 3 of 5Under Age Ascertainment (in Just Math)
Posted on 2010-04-03 (3 Comments)
Solution computer solution by Charlie (2010-04-03 13:43:26)
Difficulty: 4 of 5Under Perfect Square To Divisibility By 56 (in Just Math)
Posted on 2010-04-01 (15 Comments)
re: Now, four values by Charlie (2010-04-01 23:07:13)
Difficulty: 3 of 5Under Counting triplets (in Numbers)
Posted on 2010-03-31 (8 Comments)
re: Old dog, new tricks? by Charlie (2010-03-31 17:43:24)
re: By hand by Charlie (2010-03-31 15:22:09)
Solution solution by Charlie (2010-03-31 14:06:39)
Difficulty: 3 of 5Under Matching Matchbox Muse (in Probability)
Posted on 2010-03-30 (15 Comments)
re(6): Corrected Solution after Charlie's comments by Charlie (2010-07-21 13:44:44)
re(4): Corrected Solution after Charlie's comments by Charlie (2010-07-02 19:18:28)
re(3): Corrected Solution after Charlie's comments by Charlie (2010-07-01 20:11:51)
re: Corrected Solution after Charlie's comments by Charlie (2010-06-29 17:32:52)
Solution re(2): New print out of previous solution by Charlie (2010-06-29 12:27:07)
re: New print out of previous solution by Charlie (2010-06-29 11:42:53)
re: re Charlie's solution by Charlie (2010-06-29 11:32:14)
Solution solution by Charlie (2010-03-30 15:27:18)
Difficulty: 2 of 5Under Minimal area. (in Geometry)
Posted on 2010-03-29 (11 Comments)
re(3): Thoughts by Charlie (2010-03-30 21:58:44)
re: Incomplete by Charlie (2010-03-29 17:44:09)
re: solution by Charlie (2010-03-29 16:21:03)
Solution solution by Charlie (2010-03-29 16:19:33)
Difficulty: 2 of 5Under Determine Area (in Geometry)
Posted on 2010-03-27 (2 Comments)
Solution solution by Charlie (2010-03-27 16:00:37)
Difficulty: 5 of 5Under Halfway Split (in Cryptography)
Posted on 2010-03-26 (2 Comments)
Solution solution by Charlie (2010-03-26 13:21:23)
Difficulty: 2 of 5Under Progressive Pattern Poser (in Sequences)
Posted on 2010-03-25 (2 Comments)
Solution analytic and computer solutions by Charlie (2010-03-25 11:45:29)
Difficulty: 2 of 5Under More than one way to skin a cat (in Sequences)
Posted on 2010-03-24 (7 Comments)
re: Gamma a break! (spoiler) by Charlie (2010-03-24 15:46:52)
Solution Let me count the ways -- computer solution by Charlie (2010-03-24 12:49:05)
Difficulty: 3 of 5Under Palindromic and Tautonymic III (in Numbers)
Posted on 2010-03-23 (11 Comments)
re(3): Primes by Charlie (2010-03-24 00:47:38)
re: Primes by Charlie (2010-03-23 15:38:08)
Solution computer solution by Charlie (2010-03-23 15:33:34)
Difficulty: 3 of 5Under Twisted TALES (in Numbers)
Posted on 2010-03-20 (8 Comments)
re(2): computer solution by Charlie (2010-03-21 14:26:08)
Solution computer solution by Charlie (2010-03-20 13:59:49)
Difficulty: 4 of 5Under 1 + 2P*3Q= Perfect Square (in Just Math)
Posted on 2010-03-19 (1 Comments)
Some Thoughts computer exploration by Charlie (2010-03-19 12:58:28)
Difficulty: 3 of 5Under Gambler's triangulation (in Probability)
Posted on 2010-03-18 (9 Comments)
re(4): Solution by Charlie (2010-03-19 10:59:55)
Solution solution by Charlie (2010-03-18 15:33:46)
Difficulty: 3 of 5Under Naught and three poser (in Numbers)
Posted on 2010-03-17 (3 Comments)
Some Thoughts computer exploration by Charlie (2010-03-17 12:41:54)
Difficulty: 3 of 5Under Sum Digit Concern (in Probability)
Posted on 2010-03-13 (2 Comments)
Solution computer solution showing full program with base conversion by Charlie (2010-03-13 13:14:21)
Difficulty: 2 of 5Under Cubic and Consecutive Concern (in Probability)
Posted on 2010-03-11 (2 Comments)
Solution computer solution by Charlie (2010-03-11 13:45:10)
Difficulty: 2 of 5Under Rock n' roll alphametic (in Numbers)
Posted on 2010-03-09 (4 Comments)
Solution computer solution by Charlie (2010-03-09 13:49:23)
Difficulty: 3 of 5Under Prime Music Blues (in Numbers)
Posted on 2010-03-06 (5 Comments)
Solution computer solution by Charlie (2010-03-06 13:55:30)
Difficulty: 3 of 5Under The ice cream cone (in Just Math)
Posted on 2010-03-01 (4 Comments)
Solution solution by Charlie (2010-03-01 16:40:24)
Difficulty: 4 of 5Under Little cubes (in Numbers)
Posted on 2010-02-27 (5 Comments)
Solution re: computer exploration -- Sloane back on-line by Charlie (2010-03-01 03:02:49)
Some Thoughts computer exploration by Charlie (2010-02-27 14:29:40)
Difficulty: 3 of 5Under Squares joining quadratics (in Just Math)
Posted on 2010-02-24 (5 Comments)
Some Thoughts re: computer exploration (possible spoiler) -- two more squares by Charlie (2010-02-24 18:26:20)
Some Thoughts computer exploration (possible spoiler) by Charlie (2010-02-24 13:04:26)
Difficulty: 2 of 5Under Month, product and prime alphametics (in Numbers)
Posted on 2010-02-20 (2 Comments)
Solution computer solution by Charlie (2010-02-20 15:49:47)
Difficulty: 2 of 5Under Eccentric Integral (in Calculus)
Posted on 2010-02-18 (2 Comments)
Some Thoughts An attempt using numerical integration (spoiler?) by Charlie (2010-02-19 11:48:51)
Difficulty: 4 of 5Under The three sides and the height (in Numbers)
Posted on 2010-02-15 (5 Comments)
Solution computer solution by Charlie (2010-02-15 14:20:20)
Difficulty: 3 of 5Under Black and Blue Transaction (in Probability)
Posted on 2010-02-14 (2 Comments)
Solution solution by Charlie (2010-02-14 14:13:00)
Difficulty: 4 of 5Under Si fueris Romae (in Numbers)
Posted on 2010-02-12 (5 Comments)
Solution re: I know the trick (spoiler) -- computer solution added by Charlie (2010-02-12 15:45:35)
Difficulty: 4 of 5Under A streetcar named Enigma (in Numbers)
Posted on 2010-02-10 (11 Comments)
re(2): computer solution REMARK by Charlie (2010-02-28 12:21:15)
Solution computer solution by Charlie (2010-02-10 14:13:17)
Difficulty: 2 of 5Under Hotter and hotter (in Numbers)
Posted on 2010-02-08 (11 Comments)
re(5): Indecision by Charlie (2010-02-12 16:53:25)
re(3): Indecision by Charlie (2010-02-09 11:22:01)
Difficulty: 3 of 5Under Starred Steps Start (in Numbers)
Posted on 2010-02-07 (2 Comments)
Solution computer solution by Charlie (2010-02-07 14:37:39)
Difficulty: 3 of 5Under Nine Native Narrative (in Liars and Knights)
Posted on 2010-02-06 (3 Comments)
Solution computer solution by Charlie (2010-02-06 14:09:13)
Difficulty: 4 of 5Under Lucky seven (in Numbers)
Posted on 2010-02-05 (6 Comments)
re: Such a number exists. -- program for verification only by Charlie (2010-02-05 16:47:53)
Difficulty: 3 of 5Under Infinitely Continued III (in Numbers)
Posted on 2010-02-04 (7 Comments)
Solution computer solution by Charlie (2010-02-04 13:48:05)
Difficulty: 3 of 5Under Drop into the Bucket (in Shapes)
Posted on 2010-02-03 (9 Comments)
re: No Subject by Charlie (2010-02-08 12:09:24)
Solution spoiler now, hopefully by Charlie (2010-02-03 16:53:49)
Solution solution by Charlie (2010-02-03 14:21:56)
Difficulty: 3 of 5Under Curious Candidate Concern (in Logic)
Posted on 2010-02-02 (3 Comments)
Solution computer-assisted solution by Charlie (2010-02-02 13:37:02)
Difficulty: 4 of 5Under My travel IN SOME ORDER (in Numbers)
Posted on 2010-02-01 (2 Comments)
Solution computer solution by Charlie (2010-02-01 13:01:25)
Difficulty: 3 of 5Under Probable Near Pandigital Poser (in Probability)
Posted on 2010-01-31 (1 Comments)
Solution solution by Charlie (2010-01-31 14:09:57)
Difficulty: 2 of 5Under Square String Settlement (in Sequences)
Posted on 2010-01-28 (8 Comments)
re(2): re: Computer verification #2 by Charlie (2010-01-28 17:09:57)
re: Computer verification by Charlie (2010-01-28 14:24:29)
Solution solution by Charlie (2010-01-28 14:18:33)
Difficulty: 3 of 5Under Dots in a Cube (in Geometry)
Posted on 2010-01-27 (2 Comments)
Some Thoughts solution for part 1; approximation for part 2 by Charlie (2010-01-27 14:21:01)
Difficulty: 2 of 5Under Simply Sliced Sine (in Calculus)
Posted on 2010-01-26 (1 Comments)
Solution solution by Charlie (2010-01-26 12:55:23)
Difficulty: 2 of 5Under Right Triangles (in Geometry)
Posted on 2010-01-22 (5 Comments)
Solution Using Geometer's Sketchpad ... (spoiler) by Charlie (2010-01-22 14:12:20)
Difficulty: 3 of 5Under Possible Percent Problems Part 4 (in Numbers)
Posted on 2010-01-20 (2 Comments)
Solution computer solutions by Charlie (2010-01-20 14:24:38)
Difficulty: 2 of 5Under Probable Prime Poser (in Probability)
Posted on 2010-01-19 (4 Comments)
Solution re: computer solution to part 1 by Charlie (2010-01-19 17:04:08)
Solution bonus solution by Charlie (2010-01-19 17:00:55)
Solution computer solution to part 1 by Charlie (2010-01-19 13:08:32)
Difficulty: 2 of 5Under Blind Turns (in Cryptography)
Posted on 2010-01-18 (10 Comments)
Question Has anyone noticed... by Charlie (2010-01-20 11:31:33)
Difficulty: 3 of 5Under Possible Percent Problems Part 3 (in Numbers)
Posted on 2010-01-15 (3 Comments)
Solution computer solution by Charlie (2010-01-15 13:48:28)
Difficulty: 3 of 5Under PX + 144 = Perfect Square (in Just Math)
Posted on 2010-01-12 (9 Comments)
Solution computer solution by Charlie (2010-01-12 13:03:50)
Difficulty: 3 of 5Under Possible Percent Problems Part 2 (in Numbers)
Posted on 2010-01-11 (4 Comments)
Solution re(2): solution by Charlie (2010-01-11 15:01:46)
Solution re: solution by Charlie (2010-01-11 14:34:53)
Difficulty: 4 of 5Under Quaint Quartic-Quadratic Sum (in Just Math)
Posted on 2010-01-09 (3 Comments)
Some Thoughts computer exploration (spoiler) by Charlie (2010-01-09 16:58:37)
Difficulty: 3 of 5Under Possible Percent Problems Part 1 (in Numbers)
Posted on 2010-01-08 (2 Comments)
Solution computer solution by Charlie (2010-01-08 14:15:30)
Difficulty: 3 of 5Under 15-Digits and Repunit Division (in Numbers)
Posted on 2010-01-07 (4 Comments)
Solution Basic solution by Charlie (2010-01-07 15:57:38)
Difficulty: 4 of 5Under Prime Hopscotch (in Numbers)
Posted on 2010-01-06 (17 Comments)
continuing on with the "square" version (spoilers for part 1) by Charlie (2010-01-07 01:00:34)
re(2): computer solution - query by Charlie (2010-01-06 22:36:09)
Solution computer solution by Charlie (2010-01-06 15:44:13)
Difficulty: 3 of 5Under The Rebel III (in Liars and Knights)
Posted on 2010-01-05 (4 Comments)
Solution computer solution by Charlie (2010-01-05 12:56:38)
Difficulty: 2 of 5Under Adjacently Greater Than One (in Numbers)
Posted on 2010-01-01 (6 Comments)
Solution A computer program listing and spoiler by Charlie (2010-01-01 14:01:25)
re: SPOILER by Charlie (2010-01-01 13:13:53)
Difficulty: 1 of 5Under Triangles with no area (in Shapes)
Posted on 2009-12-30 (9 Comments)
re(3): most likely way - and apology by Charlie (2009-12-31 13:23:39)
re(2): most likely way by Charlie (2009-12-30 19:18:44)
Some Thoughts most likely way by Charlie (2009-12-30 13:44:29)
Difficulty: 3 of 5Under Minimum Value with RMS (in Just Math)
Posted on 2009-12-29 (2 Comments)
Solution computer solution by Charlie (2009-12-29 14:58:11)
Difficulty: 3 of 5Under Pandigital ABCs (in Numbers)
Posted on 2009-12-28 (5 Comments)
Solution computer solution to part 1 by Charlie (2009-12-29 14:48:26)
Difficulty: 3 of 5Under Mystery Novel Exchange (in Logic)
Posted on 2009-12-26 (5 Comments)
re(2): Solution by Charlie (2010-05-28 14:42:27)
re(3): Solution by Charlie (2010-05-28 14:25:13)
Solution computer solution by Charlie (2009-12-27 15:29:51)
Difficulty: 2 of 5Under White Balls and Black Balls (in Probability)
Posted on 2009-12-23 (1 Comments)
Solution solution by Charlie (2009-12-23 14:49:27)
Difficulty: 3 of 5Under Palindromic and Tautonymic II (in Numbers)
Posted on 2009-12-20 (4 Comments)
Solution computer solutions by Charlie (2009-12-20 16:31:54)
Difficulty: 3 of 5Under Our Universe (in Word Problems)
Posted on 2009-12-16 (11 Comments)
re(3): a start -- hmmmm.... by Charlie (2009-12-17 02:50:11)
re: more by Charlie (2009-12-16 12:34:47)
more by Charlie (2009-12-16 12:24:08)
Solution re: a start -- hmmmm.... by Charlie (2009-12-16 12:09:49)
Some Thoughts a start by Charlie (2009-12-16 12:02:00)
Difficulty: 4 of 5Under Supreme Successive Shuffle (in Probability)
Posted on 2009-12-15 (9 Comments)
re(3): Recursive two-way formula. Fixed. higher numbers by Charlie (2009-12-18 13:44:32)
re(2): Recursive two-way formula. Fixed. by Charlie (2009-12-18 12:32:22)
re: Recursive two-way formula. by Charlie (2009-12-17 03:25:01)
re: For M=1 to 10 by counting---plus conjecture by Charlie (2009-12-15 12:12:20)
Some Thoughts For M=1 to 10 by counting---plus conjecture by Charlie (2009-12-15 11:52:44)
Difficulty: 3 of 5Under No Addition Allowed (in Numbers)
Posted on 2009-12-14 (6 Comments)
Solution solution by Charlie (2009-12-14 14:55:52)
Difficulty: 2 of 5Under More Collinear Points (in Geometry)
Posted on 2009-12-11 (4 Comments)
re: counterproof (maybe) by Charlie (2009-12-12 12:16:10)
Difficulty: 2 of 5Under Fair Fairy Fare (in Probability)
Posted on 2009-12-10 (4 Comments)
Solution the exact calculation by Charlie (2009-12-10 18:48:17)
Difficulty: 3 of 5Under All at Sea (in Word Problems)
Posted on 2009-12-09 (5 Comments)
Solution with a little help from my computer by Charlie (2009-12-09 13:32:13)
Difficulty: 3 of 5Under Cubic Surface (in Shapes)
Posted on 2009-12-07 (3 Comments)
formula that may be of use by Charlie (2009-12-09 02:38:51)
Some Thoughts some observations by Charlie (2009-12-07 11:25:39)
Difficulty: 3 of 5Under 5-Digit Squares (in Numbers)
Posted on 2009-12-06 (6 Comments)
basic solution by Charlie (2009-12-06 21:44:55)
Difficulty: 2 of 5Under 3x3 Grid Near Magic (in Probability)
Posted on 2009-12-05 (6 Comments)
Solution Different program; same answer by Charlie (2009-12-05 14:34:04)
Difficulty: 3 of 5Under The Red Stack (in Games)
Posted on 2009-12-04 (2 Comments)
Some Thoughts A start by Charlie (2009-12-04 12:41:54)
Difficulty: 3 of 5Under Generation Gap II (in Just Math)
Posted on 2009-12-03 (3 Comments)
Solution solution with some computer aid by Charlie (2009-12-03 12:44:40)
Difficulty: 3 of 5Under A Normal and a Parabola (in Calculus)
Posted on 2009-12-02 (5 Comments)
re: solution by Charlie (2009-12-02 12:43:05)
Difficulty: 2 of 5Under Disagreeable Calculator (in Just Math)
Posted on 2009-12-01 (5 Comments)
re: sequences by Charlie (2009-12-01 16:30:27)
Solution solution by Charlie (2009-12-01 16:27:47)
Difficulty: 3 of 5Under Tricky Tournament Treat (in Just Math)
Posted on 2009-11-30 (3 Comments)
Solution computer-assisted solution by Charlie (2009-11-30 13:59:39)
Difficulty: 4 of 5Under Consecutive Triangles (in Numbers)
Posted on 2009-11-29 (8 Comments)
re(2): an observation by Charlie (2009-11-30 11:35:10)
Solution computer-aided solution by Charlie (2009-11-29 19:04:46)
Difficulty: 3 of 5Under Reverse, Add, Palindrome (in Numbers)
Posted on 2009-11-27 (5 Comments)
Solution Basic solution by Charlie (2009-11-27 18:26:08)
Difficulty: 3 of 5Under Rooting For The Limit II (in Calculus)
Posted on 2009-11-26 (4 Comments)
Some Thoughts further computer exploration by Charlie (2009-11-26 13:47:50)
Some Thoughts It would seem... by Charlie (2009-11-26 13:37:09)
Difficulty: 3 of 5Under Exclusively Minimum Groups (in Numbers)
Posted on 2009-11-24 (3 Comments)
Solution computer aided solution by Charlie (2009-11-24 16:28:04)
Difficulty: 2 of 5Under Checkerboard Dissection (in Shapes)
Posted on 2009-11-23 (3 Comments)
Solution Hmmmm... -- better solution? by Charlie (2009-11-23 15:55:00)
Difficulty: 3 of 5Under 5^13 as product of 3 numbers (in Probability)
Posted on 2009-11-22 (4 Comments)
Solution solutions (computer used) (spoilers) by Charlie (2009-11-22 15:38:14)
Difficulty: 3 of 5Under Going Arithmetic With Alphametic II (in Just Math)
Posted on 2009-11-21 (3 Comments)
Solution computer solution by Charlie (2009-11-21 15:13:53)
Difficulty: 2 of 5Under Permute 2 Power (in Just Math)
Posted on 2009-11-18 (1 Comments)
Solution solution (spoiler) by Charlie (2009-11-18 15:15:20)
Difficulty: 2 of 5Under Postal Service (in Numbers)
Posted on 2009-11-17 (5 Comments)
Solution re: computer solutions -- Basic version by Charlie (2009-11-17 14:32:59)
Difficulty: 2 of 5Under Missing Pages (in Numbers)
Posted on 2009-11-13 (7 Comments)
Solution solution by Charlie (2009-11-13 16:48:23)
Difficulty: 3 of 5Under Getting Powerful With Euler II (in Calculus)
Posted on 2009-11-10 (4 Comments)
re: puzzling by Charlie (2009-11-10 18:43:56)
Difficulty: 2 of 5Under Sum (Pair Product) = Sum (Triplet Product) (in Probability)
Posted on 2009-11-08 (3 Comments)
Solution computer solution by Charlie (2009-11-08 16:42:29)
Difficulty: 3 of 5Under Space Square (in Shapes)
Posted on 2009-11-06 (3 Comments)
Some Thoughts construction method by Charlie (2009-11-07 10:20:39)
Some Thoughts on the other hand by Charlie (2009-11-07 00:51:26)
Some Thoughts a few thoughts by Charlie (2009-11-06 12:20:10)
Difficulty: 3 of 5Under Digits 0-9 (in Numbers)
Posted on 2009-11-05 (4 Comments)
Solution ... and the rest (spoilers) by Charlie (2009-11-05 16:58:13)
Difficulty: 3 of 5Under Two Rolling Balls (in Science)
Posted on 2009-11-04 (21 Comments)
Solution re: well... by Charlie (2009-11-05 18:50:22)
Some Thoughts my thoughts by Charlie (2009-11-05 12:05:56)
Difficulty: 2 of 5Under Gassed Up Racing (in General)
Posted on 2009-11-02 (4 Comments)
Solution solution (spoiler) by Charlie (2009-11-02 13:54:02)
Difficulty: 3 of 5Under Supreme Seventy Sum (in Just Math)
Posted on 2009-10-30 (4 Comments)
Solution computer solution by Charlie (2009-10-30 12:28:16)
Difficulty: 3 of 5Under Novel Discussion (in Logic)
Posted on 2009-10-29 (2 Comments)
Solution computer solution by Charlie (2009-10-29 18:05:42)
Difficulty: 3 of 5Under Half a Circle, Half a Sphere (in Probability)
Posted on 2009-10-28 (4 Comments)
Some Thoughts part 2 numerically -- monte carlo method (spoiler) by Charlie (2009-10-28 13:10:27)
Some Thoughts choosing random points by Charlie (2009-10-28 11:13:08)
Difficulty: 2 of 5Under ten*ten – ten = ninety (in Numbers)
Posted on 2009-10-25 (5 Comments)
re(2): the code I used by Charlie (2009-10-25 14:56:38)
Solution the code I used by Charlie (2009-10-25 13:44:22)
Difficulty: 3 of 5Under Oil Tanker (in Just Math)
Posted on 2009-10-23 (7 Comments)
re(3): solution - relativity by Charlie (2009-10-24 11:48:21)
Solution solution by Charlie (2009-10-23 15:26:36)
Difficulty: 3 of 5Under Powering up the digits II (in Numbers)
Posted on 2009-10-22 (3 Comments)
Solution computer solution by Charlie (2009-10-22 18:00:31)
Difficulty: 3 of 5Under The ants go marching. (in Just Math)
Posted on 2009-10-21 (7 Comments)
re(2): Anty Climax for #6 by Charlie (2009-10-28 21:57:02)
re: Anty Climax for #6 by Charlie (2009-10-28 11:53:21)
The first 5 ants. (spoilers) by Charlie (2009-10-21 13:52:23)
Difficulty: 3 of 5Under No Monochrome Arithmetic Sequence (in Numbers)
Posted on 2009-10-19 (2 Comments)
Solution computer solution by Charlie (2009-10-19 18:21:33)
Difficulty: 2 of 5Under Three Prime Product (in Numbers)
Posted on 2009-10-18 (5 Comments)
Solution computer solution by Charlie (2009-10-18 15:38:15)
Difficulty: 3 of 5Under Double the Magic (in Numbers)
Posted on 2009-10-16 (2 Comments)
Solution computer solution by Charlie (2009-10-16 18:59:07)
Difficulty: 3 of 5Under x + y * 3√2 + z * 3√4 = 0 (in Just Math)
Posted on 2009-10-15 (14 Comments)
re(6): Solution - Extra font facility by Charlie (2009-10-16 12:25:53)
re(5): Solution - Extra font facility by Charlie (2009-10-16 12:21:17)
re(4): Solution - Extra font facility by Charlie (2009-10-16 12:17:23)
re(4): Solution - Extra font facility by Charlie (2009-10-15 22:44:44)
re(3): Solution - Extra font facility by Charlie (2009-10-15 22:44:21)
re(2): Solution - Extra font facility by Charlie (2009-10-15 22:40:34)
Difficulty: 3 of 5Under No Monochrome Sums (in Numbers)
Posted on 2009-10-14 (10 Comments)
re(4): Sloane says by Charlie (2009-10-15 14:21:37)
re(3): Sloane says by Charlie (2009-10-15 12:24:52)
re(2): Sloane says by Charlie (2009-10-15 12:15:53)
Solution computer solution by Charlie (2009-10-14 15:09:47)
Difficulty: 3 of 5Under Squaring a Square Grid (in Numbers)
Posted on 2009-10-10 (4 Comments)
re: All nonzero? by Charlie (2009-10-10 15:01:39)
Difficulty: 2 of 5Under 8 points no convex pentagon (in Shapes)
Posted on 2009-10-09 (4 Comments)
Solution solution by Charlie (2009-10-09 17:36:41)
Difficulty: 3 of 5Under Mensa Maze (in General)
Posted on 2009-10-07 (20 Comments)
re(2): Best Minimum? by Charlie (2009-10-07 16:22:08)
Difficulty: 3 of 5Under Probable Ten Power (in Probability)
Posted on 2009-10-06 (2 Comments)
Solution computer solution by Charlie (2009-10-06 12:17:28)
Difficulty: 2 of 5Under 5 points to convex quad (in Shapes)
Posted on 2009-10-05 (4 Comments)
re: another proof by Charlie (2009-10-07 12:06:19)
Solution another proof by Charlie (2009-10-06 11:22:51)
Difficulty: 3 of 5Under Near Magic Square Alphametics II (in Numbers)
Posted on 2009-10-03 (2 Comments)
Solution computer solution by Charlie (2009-10-04 04:22:40)
Difficulty: 3 of 5Under Floating Tangent (in Geometry)
Posted on 2009-10-02 (3 Comments)
Solution numeric solution by Charlie (2009-10-02 19:44:51)
Difficulty: 3 of 5Under Fixed length from unit square. (in Shapes)
Posted on 2009-10-01 (4 Comments)
comparison of formulas by Charlie (2009-10-01 18:30:08)
Some Thoughts solution -- I think by Charlie (2009-10-01 14:14:12)
Difficulty: 3 of 5Under Repunit Product, Palindrome Not (in Just Math)
Posted on 2009-09-30 (2 Comments)
re: Not very formal, but ... (spoiler) by Charlie (2009-10-01 11:24:25)
Difficulty: 2 of 5Under Double Coverage (in Shapes)
Posted on 2009-09-29 (4 Comments)
Solution re(2): considering second pentomino by Charlie (2009-09-30 01:48:37)
considering second pentomino by Charlie (2009-09-29 13:51:53)
computer solution for first pentomino by Charlie (2009-09-29 13:03:04)
Difficulty: 2 of 5Under Some summed sin and cos (in Numbers)
Posted on 2009-09-28 (2 Comments)
Solution computer solution by Charlie (2009-09-28 18:57:28)
Difficulty: 3 of 5Under 5x5 Grid Alphamagic (in Numbers)
Posted on 2009-09-27 (2 Comments)
Solution computer solution by Charlie (2009-09-27 22:07:02)
Difficulty: 3 of 5Under Neat Aten (in Numbers)
Posted on 2009-09-26 (3 Comments)
Solution with computer by Charlie (2009-09-27 13:30:42)
Difficulty: 3 of 5Under ABCD's Of Greatest Divisor (in Numbers)
Posted on 2009-09-24 (3 Comments)
Solution QB version by Charlie (2009-09-24 14:28:03)
Difficulty: 3 of 5Under Realmazure Rationale II (in Logic)
Posted on 2009-09-23 (3 Comments)
Solution re: solution by Charlie (2009-09-23 12:53:47)
Difficulty: 3 of 5Under Triangular Transcension (in Numbers)
Posted on 2009-09-22 (3 Comments)
Solution UBASIC version by Charlie (2009-09-23 00:52:01)
Difficulty: 3 of 5Under 3x3 Grid Alphamagic (in Numbers)
Posted on 2009-09-17 (2 Comments)
Solution computer solution by Charlie (2009-09-17 13:55:21)
Difficulty: 2 of 5Under Worldly Integral (in Calculus)
Posted on 2009-09-15 (1 Comments)
Solution computer solution by Charlie (2009-09-15 21:51:52)
Difficulty: 4 of 5Under Unit lengths from movable points to unit triangles. (in Geometry)
Posted on 2009-09-14 (11 Comments)
re(2): more precision by Charlie (2009-09-15 00:30:43)
re: more precision by Charlie (2009-09-14 23:43:16)
computer exploration by Charlie (2009-09-14 23:17:34)
re: initial constraints (a start) by Charlie (2009-09-14 19:43:49)
Difficulty: 2 of 5Under Mi, Us and Amicus (in Numbers)
Posted on 2009-09-13 (2 Comments)
Solution computer solution by Charlie (2009-09-13 14:35:09)
Difficulty: 2 of 5Under Real Product to Integer (in Just Math)
Posted on 2009-09-12 (2 Comments)
Some Thoughts computer exploration by Charlie (2009-09-12 15:19:33)
Difficulty: 4 of 5Under Unit lengths and triangles (in Geometry)
Posted on 2009-09-09 (3 Comments)
Solution A computer solution by Charlie (2009-09-09 18:23:16)
Difficulty: 3 of 5Under More Consecutive Semiprimes (in Numbers)
Posted on 2009-09-08 (6 Comments)
re: part 2 (computer solution) UBASIC version by Charlie (2009-09-08 23:58:21)
Difficulty: 3 of 5Under Minimum Scrabble (in Word Problems)
Posted on 2009-09-02 (9 Comments)
Solution re(7): preliminary computer result by Charlie (2009-09-03 09:41:50)
re(6): preliminary computer result by Charlie (2009-09-03 09:40:53)
Solution re(5): preliminary computer result by Charlie (2009-09-03 04:14:16)
Solution re(3): preliminary computer result by Charlie (2009-09-02 15:15:55)
re(2): preliminary computer result by Charlie (2009-09-02 14:56:05)
re: preliminary computer result by Charlie (2009-09-02 14:25:51)
Some Thoughts preliminary computer result by Charlie (2009-09-02 14:14:20)
Difficulty: 3 of 5Under Unequally Yoked III (in Just Math)
Posted on 2009-09-01 (3 Comments)
Some Thoughts computer exploration (possible spoilers) by Charlie (2009-09-01 12:35:34)
Difficulty: 3 of 5Under Repeat 4, get square (in Just Math)
Posted on 2009-08-29 (3 Comments)
re(2): computer exploration--possible solution (spoiler) by Charlie (2009-08-30 01:49:39)
Some Thoughts computer exploration--possible solution (spoiler) by Charlie (2009-08-29 19:24:11)
Difficulty: 3 of 5Under Random + Random + Random (in Probability)
Posted on 2009-08-28 (2 Comments)
Solution solution by Charlie (2009-08-28 17:59:35)
Difficulty: 2 of 5Under A! + B! + C! = 3D (in Just Math)
Posted on 2009-08-27 (5 Comments)
re: Metaphysics? by Charlie (2009-08-29 00:41:21)
Difficulty: 3 of 5Under Triangulating a Square (in Numbers)
Posted on 2009-08-26 (3 Comments)
Solution computer solution by Charlie (2009-08-26 18:11:23)
Difficulty: 3 of 5Under Extreme Entireties (in Numbers)
Posted on 2009-08-25 (2 Comments)
Solution computer solution by Charlie (2009-08-25 13:57:41)
Difficulty: 3 of 5Under Random +, - or / Random (in Probability)
Posted on 2009-08-24 (2 Comments)
Division solution by Charlie (2009-08-24 19:16:12)
+ and - solution by Charlie (2009-08-24 15:31:04)
Difficulty: 2 of 5Under Priming a Square (in Numbers)
Posted on 2009-08-23 (5 Comments)
Solution UBASIC solution by Charlie (2009-08-23 19:49:40)
Difficulty: 3 of 5Under From Figsdale, Going to Garsville (in Just Math)
Posted on 2009-08-22 (2 Comments)
Solution Basic solution by Charlie (2009-08-22 16:47:03)
Difficulty: 2 of 5Under Year of the Roman (in Numbers)
Posted on 2009-08-21 (5 Comments)
re: another interpretation by Charlie (2009-08-21 14:20:17)
Difficulty: 2 of 5Under Number = Power Remainder (in Numbers)
Posted on 2009-08-20 (3 Comments)
Solution computer solutions by Charlie (2009-08-20 11:40:14)
Difficulty: 3 of 5Under The Shadow in a Sphere (in Shapes)
Posted on 2009-08-19 (7 Comments)
re(2): Solution by Charlie (2009-08-20 00:33:46)
re: Solution by Charlie (2009-08-19 19:29:41)
Solution solution by Charlie (2009-08-19 19:22:12)
Some Thoughts re: clarification by Charlie (2009-08-19 12:45:49)
Difficulty: 2 of 5Under Even Corners and Equal Subgrids (in Numbers)
Posted on 2009-08-18 (5 Comments)
re(2): computer solution by Charlie (2009-08-18 16:33:30)
Solution computer solution by Charlie (2009-08-18 16:31:33)
Difficulty: 4 of 5Under Random x Random (in Calculus)
Posted on 2009-08-17 (2 Comments)
Solution solution by Charlie (2009-08-17 18:53:29)
Difficulty: 3 of 5Under Primes and Squares (in Just Math)
Posted on 2009-08-16 (3 Comments)
Some Thoughts computer exploration by Charlie (2009-08-16 16:50:32)
Difficulty: 2 of 5Under Grid and Equal Subgrids (in Numbers)
Posted on 2009-08-14 (4 Comments)
Solution computer solution by Charlie (2009-08-14 15:34:21)
Difficulty: 3 of 5Under Playground Maze (in Games)
Posted on 2009-08-13 (6 Comments)
re: Ignore entry? by Charlie (2009-08-13 21:14:39)
Solution computer solution by Charlie (2009-08-13 18:45:26)
Difficulty: 2 of 5Under Piano and Potent Pane (in Numbers)
Posted on 2009-08-12 (6 Comments)
re(3): Missed Solution? by Charlie (2009-08-13 11:14:53)
re: Missed Solution? by Charlie (2009-08-13 02:26:43)
Difficulty: 3 of 5Under A Strange Game of Poker (in Numbers)
Posted on 2009-08-11 (3 Comments)
Solution computer solution agrees by Charlie (2009-08-11 17:54:45)
Difficulty: 3 of 5Under Some Quadratics Equal Square (in Just Math)
Posted on 2009-08-10 (2 Comments)
Some Thoughts computer exploration -- possible solution by Charlie (2009-08-10 12:49:50)
Difficulty: 3 of 5Under 4-Letter Words (in Word Problems)
Posted on 2009-08-09 (5 Comments)
re(3): Categories? by Charlie (2009-08-10 22:11:25)
re: Categories? by Charlie (2009-08-10 11:25:34)
Difficulty: 2 of 5Under First Digit Four (in Numbers)
Posted on 2009-08-08 (3 Comments)
re: statistics by Charlie (2009-08-08 15:41:29)
Solution statistics by Charlie (2009-08-08 15:36:41)
Difficulty: 3 of 5Under Child Play.. (in Numbers)
Posted on 2009-08-07 (10 Comments)
official solution by Charlie (2009-08-12 18:08:42)
Solution re: computer solution -- whoops! by Charlie (2009-08-07 14:05:19)
computer solution by Charlie (2009-08-07 13:55:09)
Difficulty: 3 of 5Under Conic Spiral (in Geometry)
Posted on 2009-08-06 (2 Comments)
Solution computer solution by Charlie (2009-08-06 17:38:33)
Difficulty: 2 of 5Under Even Erasure (in Just Math)
Posted on 2009-08-05 (3 Comments)
Solution solution by Charlie (2009-08-05 12:11:08)
Difficulty: 3 of 5Under Realmazure Rationale (in Logic)
Posted on 2009-08-02 (4 Comments)
Solution computer solution by Charlie (2009-08-02 15:07:28)
Difficulty: 2 of 5Under Eleven Exponent Divides Evenly (in Just Math)
Posted on 2009-08-01 (3 Comments)
Solution re(2): Solution verification by computer by Charlie (2009-08-01 16:30:59)
Solution re: Solution by Charlie (2009-08-01 16:25:37)
Difficulty: 3 of 5Under Near Magic Square Alphametics (in Numbers)
Posted on 2009-07-31 (5 Comments)
Solution computer solution by Charlie (2009-07-31 17:16:22)
Difficulty: 3 of 5Under Layers (in Logic)
Posted on 2009-07-30 (1 Comments)
Solution computer solution by Charlie (2009-07-30 22:26:14)
Difficulty: 2 of 5Under How and When (in Numbers)
Posted on 2009-07-29 (17 Comments)
re: Precisely by Charlie (2009-07-31 14:20:28)
re(3): two views by Charlie (2009-07-30 22:24:08)
re: two views by Charlie (2009-07-30 11:50:20)
Difficulty: 2 of 5Under Getting Powerful With Euler (in Calculus)
Posted on 2009-07-28 (3 Comments)
Some Thoughts numeric answer by Charlie (2009-07-28 12:31:41)
Difficulty: 3 of 5Under Devilish Cubes (in Logic)
Posted on 2009-07-27 (2 Comments)
re: computer solution by Charlie (2009-08-12 18:24:49)
Solution computer solution by Charlie (2009-07-27 16:28:53)
Difficulty: 3 of 5Under Maximum SOD (in Numbers)
Posted on 2009-07-21 (1 Comments)
Solution UBASIC solution by Charlie (2009-07-21 17:51:13)
Difficulty: 2 of 5Under Quadrilateral in a rectangle (in Just Math)
Posted on 2009-07-17 (5 Comments)
re(4): Solution - your reason to edit by Charlie (2009-07-19 13:08:13)
re(3): Solution - your reason to edit by Charlie (2009-07-19 13:07:02)
Difficulty: 3 of 5Under Arithmetic and Geometric Pandigital (in Numbers)
Posted on 2009-07-16 (11 Comments)
Question re: Considerations which might reduce programming by Charlie (2009-07-23 16:48:44)
Difficulty: 3 of 5Under Lights On Diagonally (in Logic)
Posted on 2009-07-15 (7 Comments)
re(2): computer solution by Charlie (2009-07-16 01:15:48)
Solution computer solution by Charlie (2009-07-15 19:01:00)
Difficulty: 2 of 5Under Collinear intersections (in Geometry)
Posted on 2009-07-13 (3 Comments)
re(2): proof by Charlie (2009-07-14 02:34:14)
Solution proof by Charlie (2009-07-13 17:53:05)
Difficulty: 2 of 5Under Primes Around a Square (in Numbers)
Posted on 2009-07-10 (12 Comments)
Solution added for part 2 by Charlie (2009-07-11 14:14:01)
Solution part 1 computer solution by Charlie (2009-07-11 13:00:46)
Difficulty: 3 of 5Under Sum Powers Sum Square II (in Just Math)
Posted on 2009-07-08 (6 Comments)
Solution re: oops slight error by Charlie (2009-07-10 12:29:49)
Difficulty: 2 of 5Under Colorful Integral (in Calculus)
Posted on 2009-07-06 (4 Comments)
Solution re(3): computer solution -- corrected by Charlie (2009-07-07 11:33:28)
re(2): computer solution by Charlie (2009-07-07 02:17:28)
Solution computer solution by Charlie (2009-07-06 16:52:14)
Difficulty: 3 of 5Under Going Cyclic With Geometric II (in Numbers)
Posted on 2009-07-04 (4 Comments)
re: computer solution for N<=100 -- the program by Charlie (2009-07-04 16:05:28)
re: computer solution for N<=100 -- the rest of it by Charlie (2009-07-04 16:01:13)
Solution computer solution for N<=100 by Charlie (2009-07-04 15:59:55)
Difficulty: 2 of 5Under Fly on a cone (in Just Math)
Posted on 2009-07-01 (2 Comments)
Solution solution by Charlie (2009-07-01 13:46:23)
Difficulty: 3 of 5Under 3/9, 12/9 and 1/2 (in Numbers)
Posted on 2009-06-30 (2 Comments)
Solution computer solution by Charlie (2009-06-30 12:59:33)
Difficulty: 2 of 5Under Terminating in seven sevens (in Numbers)
Posted on 2009-06-26 (2 Comments)
Solution computer solution by Charlie (2009-06-26 13:54:27)
Difficulty: 3 of 5Under 3x3 Nim (in Games)
Posted on 2009-06-25 (26 Comments)
misère form by Charlie (2009-06-28 14:13:44)
Solution simplification by Charlie (2009-06-27 13:48:38)
re(2): computer solution by Charlie (2009-06-26 16:03:26)
Solution computer solution by Charlie (2009-06-26 09:50:05)
re(3): tes he can revisited by Charlie (2009-06-26 09:45:54)
re: Winning Strategy (spoiler) by Charlie (2009-06-25 17:05:26)
re: tes he can by Charlie (2009-06-25 14:33:36)
Difficulty: 2 of 5Under Subtract 1, get a square (in Just Math)
Posted on 2009-06-24 (4 Comments)
Solution extended computer list by Charlie (2009-06-24 17:03:37)
Difficulty: 3 of 5Under Rationally Integers (in Just Math)
Posted on 2009-06-16 (2 Comments)
Some Thoughts some more via computer program by Charlie (2009-06-16 12:46:42)
Some Thoughts some obvious ones by Charlie (2009-06-16 12:24:14)
Difficulty: 2 of 5Under To Know Titans (in Numbers)
Posted on 2009-06-14 (3 Comments)
Solution computer-aided solution by Charlie (2009-06-14 13:22:55)
Difficulty: 3 of 5Under 2*s3 = 3*t2 + 4 (in Just Math)
Posted on 2009-06-13 (3 Comments)
Some Thoughts computer finding by Charlie (2009-06-13 19:38:17)
Difficulty: 3 of 5Under A personal lotto game (in Probability)
Posted on 2009-06-12 (4 Comments)
Some Thoughts simulation by Charlie (2009-06-12 15:57:05)
Difficulty: 3 of 5Under Near Goldbach Alphametics (in Numbers)
Posted on 2009-06-10 (2 Comments)
program for part 2 by Charlie (2009-06-11 16:03:12)
part 1 solution by Charlie (2009-06-10 18:55:21)
Difficulty: 2 of 5Under Going Cyclic With Arithmetic (in Numbers)
Posted on 2009-06-08 (4 Comments)
Solution computer solution by Charlie (2009-06-08 13:54:28)
Difficulty: 2 of 5Under Wonderful problem (in Cryptography)
Posted on 2009-06-07 (10 Comments)
Solution solution (QuickBasic) by Charlie (2009-06-07 16:25:10)
Difficulty: 3 of 5Under Pandigital and Pretty Powerful IV (in Numbers)
Posted on 2009-06-06 (4 Comments)
Solution same results - different program by Charlie (2009-06-06 16:53:10)
Difficulty: 3 of 5Under 5 Cards Magic Trick Redux (in Logic)
Posted on 2009-06-05 (4 Comments)
Solution a way by Charlie (2009-06-06 00:31:41)
Some Thoughts maximal size by Charlie (2009-06-05 15:35:09)
Difficulty: 2 of 5Under Some Digits Sum 37 (in Numbers)
Posted on 2009-06-04 (4 Comments)
Solution re(2): computer solution (a quibble) by Charlie (2009-06-04 16:34:03)
Solution computer solution by Charlie (2009-06-04 13:27:18)
Difficulty: 4 of 5Under Lights switched (in Logic)
Posted on 2009-06-03 (5 Comments)
re(2): computer solution by Charlie (2009-06-04 13:13:29)
Solution computer solution by Charlie (2009-06-03 16:50:45)
Difficulty: 3 of 5Under Pandigital and Doubly Pandigital (in Numbers)
Posted on 2009-06-02 (2 Comments)
Solution computer solution by Charlie (2009-06-02 14:02:33)
Difficulty: 4 of 5Under The 5 cards Magic trick Rechallenges! (in Logic)
Posted on 2009-06-01 (4 Comments)
Question re: Corection To The Problem!!! Please Read by Charlie (2009-06-01 15:59:28)
Solution No Subject by Charlie (2009-06-01 14:15:02)
Difficulty: 3 of 5Under Pandigital Recycling Points (in Logic)
Posted on 2009-05-31 (6 Comments)
re(2): analytic solution by Charlie (2009-06-03 12:33:02)
Difficulty: 2 of 5Under Prime square with distinct digits (in Numbers)
Posted on 2009-05-30 (2 Comments)
Solution UBASIC solution by Charlie (2009-05-30 16:02:26)
Difficulty: 4 of 5Under 5 Cards Magic Trick (in Logic)
Posted on 2009-05-29 (7 Comments)
Some Thoughts This is not the solution but close by Charlie (2009-05-29 12:07:50)
Difficulty: 2 of 5Under Try, Four and Five (in Numbers)
Posted on 2009-05-27 (3 Comments)
re: computer solution by Charlie (2009-05-27 13:11:57)
Solution computer solution by Charlie (2009-05-27 13:04:44)
Difficulty: 2 of 5Under Circumcircle and Incircle (in Just Math)
Posted on 2009-05-26 (4 Comments)
re: mathematica solution by Charlie (2009-05-26 13:21:07)
Difficulty: 2 of 5Under Six Seat Schedule (in Logic)
Posted on 2009-05-25 (4 Comments)
Solution another computer solution by Charlie (2009-05-25 16:15:01)
Difficulty: 2 of 5Under Getting Natural With Sine (in Calculus)
Posted on 2009-05-19 (3 Comments)
Solution Using Wolfram's Online Integrator by Charlie (2009-05-19 13:09:31)
Some Thoughts numerical integration with computer--but what is this number? by Charlie (2009-05-19 12:28:29)
Difficulty: 2 of 5Under Roman Trivia (in Numbers)
Posted on 2009-05-17 (7 Comments)
re(2): computer solution by Charlie (2009-05-19 11:43:35)
Solution computer solution by Charlie (2009-05-17 15:53:13)
Difficulty: 3 of 5Under Curious Cubic Triplet(s) (in Just Math)
Posted on 2009-05-16 (2 Comments)
too bad they all have to be positive (spoiler present) by Charlie (2009-05-16 17:04:01)
Difficulty: 2 of 5Under Dimensions of a box (in Calculus)
Posted on 2009-05-15 (3 Comments)
Solution solution without calculus by Charlie (2009-05-15 14:09:30)
Difficulty: 3 of 5Under Sequence Trails (in Sequences)
Posted on 2009-05-14 (4 Comments)
Hints/Tips computer visualization aid by Charlie (2009-05-14 15:50:32)
Difficulty: 2 of 5Under Pandigital and Pretty Powerful III (in Numbers)
Posted on 2009-05-12 (4 Comments)
Solution Version in Basic by Charlie (2009-05-12 15:11:21)
Difficulty: 1 of 5Under Random chord problem (in Geometry)
Posted on 2009-05-11 (17 Comments)
re(2): solution, maybe by Charlie (2009-05-12 11:10:59)
Solution re: solution, maybe by Charlie (2009-05-11 22:56:01)
re: Is this? by Charlie (2009-05-11 17:27:58)
re: difficulty-one by Charlie (2009-05-11 17:20:48)
Hints/Tips re: That can't be right (Hint, Spoiler) by Charlie (2009-05-11 12:55:43)
Difficulty: 2 of 5Under Magic Trick (in Numbers)
Posted on 2009-05-10 (10 Comments)
re: 189 can be the answer by Charlie (2011-04-28 23:27:57)
Some Thoughts some ideas by Charlie (2009-05-10 17:05:33)
Difficulty: 2 of 5Under 2N Digit Numbers (in Numbers)
Posted on 2009-05-09 (5 Comments)
re(2): computer solution by Charlie (2009-05-10 13:01:17)
Solution computer solution by Charlie (2009-05-09 18:11:55)
Difficulty: 3 of 5Under Pandigital and Pretty Powerful II (in Numbers)
Posted on 2009-05-06 (2 Comments)
Solution basic computer solution by Charlie (2009-05-06 13:10:35)
Difficulty: 3 of 5Under Knights' Tours - Long & Short (in Games)
Posted on 2009-05-05 (7 Comments)
re(2): solution (and variance) by Charlie (2009-05-06 11:06:54)
re: computer solution by Charlie (2009-05-05 17:51:17)
Solution computer solution by Charlie (2009-05-05 17:34:37)
Difficulty: 3 of 5Under Bouncy Bouncy Part 3 (in Geometry)
Posted on 2009-05-04 (1 Comments)
Solution solution with computer confirmation by Charlie (2009-05-04 17:05:11)
Difficulty: 3 of 5Under Cubic Diagonals and Edges (in Numbers)
Posted on 2009-04-30 (6 Comments)
re(2): computer solutions by Charlie (2009-05-03 12:13:31)
re: computer solutions--the program by Charlie (2009-05-01 12:02:43)
Solution computer solutions by Charlie (2009-05-01 11:59:18)
Difficulty: 2 of 5Under Binomial Pandigital(s) (in Numbers)
Posted on 2009-04-28 (3 Comments)
Solution computer solution in basic by Charlie (2009-04-28 12:28:47)
Difficulty: 2 of 5Under B-nary (in Numbers)
Posted on 2009-04-27 (2 Comments)
Solution somewhat of a solution by Charlie (2009-04-27 14:59:07)
Difficulty: 2 of 5Under Add 1, get a square II (in Numbers)
Posted on 2009-04-26 (2 Comments)
Solution solution and computer exploration by Charlie (2009-04-26 17:42:04)
Difficulty: 4 of 5Under 'Chess' Polygons (in Shapes)
Posted on 2009-04-24 (5 Comments)
Solution re(2): computer solutions -- fixed by Charlie (2009-04-25 00:57:55)
re: computer solutions by Charlie (2009-04-25 00:43:11)
Solution computer solutions by Charlie (2009-04-25 00:29:01)
Difficulty: 3 of 5Under Switched On (in Logic)
Posted on 2009-04-21 (2 Comments)
Solution computer solution by Charlie (2009-04-21 17:42:53)
Difficulty: 2 of 5Under Two Squares (in Geometry)
Posted on 2009-04-20 (7 Comments)
re(2): Solution by Charlie (2009-04-21 11:40:39)
Difficulty: 2 of 5Under five, four and tri (in Numbers)
Posted on 2009-04-18 (4 Comments)
Solution re: Alphametric computer soltuion by Charlie (2009-04-18 17:27:21)
Difficulty: 4 of 5Under In a Mystery.... (in Word Problems)
Posted on 2009-04-16 (12 Comments)
The only computer use is a little help from Gray by Charlie (2009-04-16 15:57:21)
another by Charlie (2009-04-16 15:29:18)
another by Charlie (2009-04-16 13:43:34)
Difficulty: 2 of 5Under Newsless Alphametics (in Just Math)
Posted on 2009-04-15 (5 Comments)
Solution computer solution by Charlie (2009-04-15 13:48:49)
Difficulty: 2 of 5Under Powering up the digits (in Numbers)
Posted on 2009-04-12 (4 Comments)
Solution program solution by Charlie (2009-04-13 02:55:02)
Difficulty: 4 of 5Under Hands On A Clock Part 2 (in General)
Posted on 2009-04-10 (4 Comments)
Solution re: Spec-tacular by Charlie (2009-04-13 18:49:34)
Solution computer assisted solution by Charlie (2009-04-10 16:38:52)
Difficulty: 3 of 5Under Prime Squares (in Numbers)
Posted on 2009-04-09 (5 Comments)
re: computer solution (spoiler) by Charlie (2009-04-09 12:28:07)
Difficulty: 2 of 5Under Way to minimum and maximum (in Just Math)
Posted on 2009-04-08 (4 Comments)
Solution computer solution including the xxxxxx' es by Charlie (2009-04-08 17:42:02)
Difficulty: 3 of 5Under Wrap a gram (in Word Problems)
Posted on 2009-04-01 (8 Comments)
re(2): The anagrams (Spoiler) by Charlie (2009-04-01 23:11:43)
Difficulty: 2 of 5Under Digits 1-7 (in Just Math)
Posted on 2009-03-30 (6 Comments)
re(2): computer solution by Charlie (2009-03-30 17:50:25)
Solution computer solution by Charlie (2009-03-30 13:47:39)
Difficulty: 2 of 5Under Edgy Integral (in Calculus)
Posted on 2009-03-25 (4 Comments)
Solution Basic solution by Charlie (2009-03-25 13:44:35)
Difficulty: 3 of 5Under Plural without an S (in Word Problems)
Posted on 2009-03-24 (7 Comments)
another by Charlie (2009-03-24 10:38:18)
Difficulty: 3 of 5Under Pandigital and Pretty Powerful (in Numbers)
Posted on 2009-03-23 (4 Comments)
re: computer solution by Charlie (2009-03-23 12:01:24)
Solution Basic computer solution by Charlie (2009-03-23 11:54:31)
Difficulty: 3 of 5Under 5 x 5 Maze by 2s and 3s (in General)
Posted on 2009-03-22 (7 Comments)
re(3): Solution by Charlie (2009-03-27 11:17:20)
re: Solution by Charlie (2009-03-23 10:41:27)
Difficulty: 2 of 5Under Making integer an expression (in Just Math)
Posted on 2009-03-20 (13 Comments)
computer solution by Charlie (2009-03-20 15:43:58)
Difficulty: 3 of 5Under 8 Words (in Word Problems)
Posted on 2009-03-19 (14 Comments)
re: fast solo wins game by Charlie (2009-03-19 21:18:33)
Solution computer solution by Charlie (2009-03-19 17:43:13)
re: Operations by Charlie (2009-03-19 15:37:05)
Difficulty: 3 of 5Under Exponent Crossed Power (in Just Math)
Posted on 2009-03-18 (10 Comments)
re: No Subject by Charlie (2009-03-18 22:00:46)
re: Titration or Tetration ? by Charlie (2009-03-18 15:54:16)
Some Thoughts going farther by Charlie (2009-03-18 15:50:28)
Some Thoughts improved program by Charlie (2009-03-18 15:19:52)
Some Thoughts computer exploration by Charlie (2009-03-18 13:46:28)
Difficulty: 3 of 5Under Numeric Anagrams (in Numbers)
Posted on 2009-03-17 (2 Comments)
Solution computer solution by Charlie (2009-03-17 17:29:27)
Difficulty: 3 of 5Under Skyscraper Counting (in Numbers)
Posted on 2009-03-16 (3 Comments)
Solution analytic explanation of recursion formula by Charlie (2009-03-16 16:04:41)
Solution solution by Charlie (2009-03-16 13:31:56)
Difficulty: 4 of 5Under Perplexing Dual Vowels (in Word Problems)
Posted on 2009-03-13 (9 Comments)
re(2): A computerized start by Charlie (2009-03-13 18:27:35)
Some Thoughts re: A computerized start by Charlie (2009-03-13 13:18:41)
Hints/Tips A computerized start by Charlie (2009-03-13 12:59:54)
Difficulty: 2 of 5Under 2009 a cube? Baseless! (in Just Math)
Posted on 2009-03-09 (5 Comments)
re(2): analytic solution - doubt by Charlie (2009-03-10 11:21:35)
Difficulty: 2 of 5Under Sequence with only 3 numbers (in Just Math)
Posted on 2009-03-07 (11 Comments)
Solution to the question posed in the official solution (spoiler) by Charlie (2009-03-11 10:55:45)
Difficulty: 3 of 5Under Add to Product Inverse (in Just Math)
Posted on 2009-03-06 (5 Comments)
re: computer exploration by Charlie (2009-03-06 18:54:27)
Some Thoughts computer exploration by Charlie (2009-03-06 13:00:00)
Difficulty: 2 of 5Under Integer Side Lengths (in Just Math)
Posted on 2009-03-05 (9 Comments)
Solution computer solution by Charlie (2009-03-05 12:48:10)
Difficulty: 2 of 5Under Palindromic and Tautonymic (in Numbers)
Posted on 2009-03-03 (5 Comments)
re(2): for the actual first question by Charlie (2009-03-03 16:24:46)
Solution re: for the actual first question by Charlie (2009-03-03 16:22:08)
Solution for the actual first question by Charlie (2009-03-03 16:19:49)
Solution computer solution by Charlie (2009-03-03 14:07:14)
Difficulty: 4 of 5Under Numerology (in Just Math)
Posted on 2009-02-28 (10 Comments)
re: Onomastic prolixity by Charlie (2009-03-05 02:57:44)
Solution re(2): computer solution by Charlie (2009-03-01 04:01:34)
Solution computer solution by Charlie (2009-02-28 15:52:40)
Difficulty: 3 of 5Under super powerful pandigitals (in Numbers)
Posted on 2009-02-24 (8 Comments)
re(2): Uncertain by Charlie (2009-02-24 16:47:42)
Solution Hmmmm.... (computer solution? -- spoiler) by Charlie (2009-02-24 12:36:51)
Difficulty: 2 of 5Under Curious Consecutive Cyphers II (in Just Math)
Posted on 2009-02-23 (7 Comments)
re: Complete Analytic Solution -- a nit to pick by Charlie (2009-02-25 11:19:14)
re(2): Computer Solution by Charlie (2009-02-23 12:45:50)
re: Computer Solution by Charlie (2009-02-23 12:32:51)
Solution computer solution by Charlie (2009-02-23 12:27:29)
Difficulty: 2 of 5Under Now, the Old Hat (in Numbers)
Posted on 2009-02-20 (5 Comments)
Solution computer solution by Charlie (2009-02-20 12:39:16)
Difficulty: 3 of 5Under My Wonky CalcuLESS (in Logic)
Posted on 2009-02-18 (14 Comments)
re(9): problems with computer program by Charlie (2009-02-20 11:39:34)
re(6): problems with computer program by Charlie (2009-02-19 17:16:11)
re(5): problems with computer program by Charlie (2009-02-19 11:48:19)
re(3): problems with computer program by Charlie (2009-02-19 03:21:11)
re(2): problems with computer program by Charlie (2009-02-19 02:49:06)
problems with computer program by Charlie (2009-02-18 16:48:11)
Difficulty: 2 of 5Under Pennies, Dimes, and Quarters (in Numbers)
Posted on 2009-02-17 (11 Comments)
Solution Solution by Charlie (2009-02-17 12:52:44)
part 1 -- computer solution by Charlie (2009-02-17 12:00:47)
Difficulty: 2 of 5Under Another case of divisibility (in Just Math)
Posted on 2009-02-15 (3 Comments)
Some Thoughts partial list -- possible spoiler. by Charlie (2009-02-15 14:19:34)
Difficulty: 3 of 5Under Almost Naked Sudoku (in Logic)
Posted on 2009-02-12 (4 Comments)
Hints/Tips assuming by Charlie (2009-02-12 18:28:53)
Difficulty: 4 of 5Under Perfect Pairs (in Probability)
Posted on 2009-02-11 (6 Comments)
re(2): simulation -- extended by Charlie (2009-02-11 23:59:46)
re: simulation -- correction by Charlie (2009-02-11 23:40:18)
re: Ho ho, or Ho hum? by Charlie (2009-02-11 18:30:50)
re: Ho ho, or Ho hum? by Charlie (2009-02-11 18:26:57)
Some Thoughts simulation by Charlie (2009-02-11 16:41:28)
Difficulty: 2 of 5Under Elegant Exponent Exposition (in Numbers)
Posted on 2009-02-09 (3 Comments)
re: computer solution -- extension to non-integral results by Charlie (2009-02-09 13:01:14)
Solution computer solution by Charlie (2009-02-09 12:51:16)
Difficulty: 3 of 5Under Happy 2009 to you all (in Just Math)
Posted on 2009-02-08 (4 Comments)
Solution computer solution by Charlie (2009-02-09 01:27:53)
Difficulty: 2 of 5Under Curious Cyclic Circumstance (in Just Math)
Posted on 2009-02-07 (1 Comments)
Solution computer solution by Charlie (2009-02-07 17:00:51)
Difficulty: 2 of 5Under Attack and defense (in Probability)
Posted on 2009-02-06 (2 Comments)
Solution solution by Charlie (2009-02-07 13:20:55)
Difficulty: 3 of 5Under Why, it's elementary my dear 74851687! (in Riddles)
Posted on 2009-02-04 (12 Comments)
Some Thoughts some thoughts by Charlie (2009-02-04 12:37:35)
Difficulty: 4 of 5Under Hypercells (in Numbers)
Posted on 2009-02-02 (11 Comments)
re(2): computer solution by Charlie (2009-02-03 12:36:50)
re: computer solution by Charlie (2009-02-03 12:00:15)
Solution computer solution by Charlie (2009-02-03 11:49:52)
Difficulty: 2 of 5Under Lucky and Unlucky Numbers (in Liars and Knights)
Posted on 2009-02-01 (10 Comments)
Solution computer solution by Charlie (2009-02-02 10:26:32)
Difficulty: 2 of 5Under The 8 cards (in Logic)
Posted on 2009-01-31 (10 Comments)
re(3): No Subject by Charlie (2009-06-04 13:22:50)
re: No Subject by Charlie (2009-06-03 12:24:51)
re(2): Logical solution by Charlie (2009-02-01 14:26:52)
Solution computer solution by Charlie (2009-01-31 17:58:27)
Difficulty: 2 of 5Under Permuting Primes Arithmetically (in Numbers)
Posted on 2009-01-30 (4 Comments)
Solution re(3): computer exploration (spoiler?) --------- Can you check? by Charlie (2009-01-30 16:22:55)
Some Thoughts re: computer exploration (spoiler?) -- another list by Charlie (2009-01-30 14:42:29)
Some Thoughts computer exploration (spoiler?) by Charlie (2009-01-30 14:35:55)
Difficulty: 4 of 5Under Top 40 (in Numbers)
Posted on 2009-01-29 (11 Comments)
re: Solution by Charlie (2009-01-29 18:08:59)
re: Solution by Charlie (2009-01-29 17:46:01)
re: Also: clarifications by Charlie (2009-01-29 14:30:25)
Difficulty: 1 of 5Under Boxed in boxes (in Just Math)
Posted on 2009-01-26 (3 Comments)
Solution Analytic Solution by Charlie (2009-01-26 14:40:35)
Difficulty: 3 of 5Under Winning the Competition (in Probability)
Posted on 2009-01-25 (4 Comments)
Solution solution by Charlie (2009-01-25 19:47:58)
re: clarification please by Charlie (2009-01-25 16:33:28)
Difficulty: 2 of 5Under Neat Network (in General)
Posted on 2009-01-24 (5 Comments)
re: Uniqueness and complications by Charlie (2009-01-24 17:57:00)
Difficulty: 3 of 5Under Knave's Tour (in Logic)
Posted on 2009-01-23 (4 Comments)
computer program by Charlie (2009-01-23 21:42:06)
Solution computer solution part 2 by Charlie (2009-01-23 21:39:47)
Solution computer solution part 1 by Charlie (2009-01-23 21:38:10)
Difficulty: 4 of 5Under Cylindrical Cuts (in Shapes)
Posted on 2009-01-22 (5 Comments)
re: numerical integration -- note on programming language by Charlie (2009-01-22 16:44:36)
Some Thoughts numerical integration by Charlie (2009-01-22 16:35:01)
Difficulty: 3 of 5Under Prisoner's Visitors Problem (in Logic)
Posted on 2009-01-21 (8 Comments)
Solution computer calculation by Charlie (2009-01-22 03:38:04)
Difficulty: 2 of 5Under The hour-glass (in Just Math)
Posted on 2009-01-20 (5 Comments)
re: Sand vs. Water? by Charlie (2009-01-21 11:24:18)
Solution solution by Charlie (2009-01-20 12:43:59)
Difficulty: 2 of 5Under Succinct Start Schedule (in Cryptography)
Posted on 2009-01-19 (4 Comments)
Solution the computer solution by Charlie (2009-01-19 22:53:37)
Hints/Tips If only... by Charlie (2009-01-19 12:32:58)
Difficulty: 3 of 5Under Multipan Balance (in Weights and Scales)
Posted on 2009-01-18 (4 Comments)
Solution computer solution by Charlie (2009-01-18 16:54:22)
Difficulty: 3 of 5Under Weird Walk (in Probability)
Posted on 2009-01-17 (4 Comments)
Solution re: solution and exploration by Charlie (2009-01-18 13:24:31)
re: huh? by Charlie (2009-01-18 13:06:45)
Solution solution and exploration by Charlie (2009-01-17 16:39:01)
Difficulty: 3 of 5Under Runners on a Square Field (in Just Math)
Posted on 2009-01-15 (4 Comments)
Solution solution, I think by Charlie (2009-01-15 18:38:27)
Difficulty: 3 of 5Under Historical Record (in Word Problems)
Posted on 2009-01-14 (7 Comments)
Solution re(2): computer solution --- continued by Charlie (2009-01-15 14:17:37)
Solution re: computer solution by Charlie (2009-01-15 14:09:35)
Solution computer solution by Charlie (2009-01-15 13:30:58)
Hints/Tips the words possible (with partial spoiler) by Charlie (2009-01-14 16:52:54)
Difficulty: 2 of 5Under A woman, her car, and a hotel... (in Riddles)
Posted on 2009-01-13 (10 Comments)
re(3): Too long! by Charlie (2009-01-14 11:11:22)
Difficulty: 2 of 5Under X-ing a Division (in Numbers)
Posted on 2009-01-12 (1 Comments)
Solution computer solution by Charlie (2009-01-12 17:25:26)
Difficulty: 2 of 5Under An Odd Couple (in Numbers)
Posted on 2009-01-10 (9 Comments)
re(2): here are the pairs - thx Charlie by Charlie (2009-01-11 12:14:13)
Hints/Tips here are the pairs by Charlie (2009-01-10 14:23:33)
Difficulty: 3 of 5Under Shuffle (in Games)
Posted on 2009-01-09 (7 Comments)
any shuffling desired by Charlie (2009-01-10 19:04:26)
Solution computer solution by Charlie (2009-01-09 20:29:22)
Difficulty: 2 of 5Under Twins (in Liars and Knights)
Posted on 2009-01-07 (7 Comments)
Solution computer solution by Charlie (2009-01-07 16:32:03)
Difficulty: 3 of 5Under Finding the Knight (in Probability)
Posted on 2009-01-06 (2 Comments)
Solution solution by Charlie (2009-01-06 16:57:08)
Difficulty: 2 of 5Under Digits 251 in sequence (in Just Math)
Posted on 2009-01-05 (6 Comments)
Solution computer solution by Charlie (2009-01-05 15:52:08)
Difficulty: 2 of 5Under 2000 cards (in General)
Posted on 2009-01-04 (10 Comments)
re: non-computer solution by Charlie (2009-01-05 19:27:42)
re(2): computer solution (spoiler) by Charlie (2009-01-05 10:05:50)
re(2): computer solution (spoiler) by Charlie (2009-01-05 01:35:10)
Solution computer solution (spoiler) by Charlie (2009-01-04 15:04:56)
Difficulty: 2 of 5Under The box (in Just Math)
Posted on 2009-01-02 (7 Comments)
re: Simple stupid way? by Charlie (2009-01-03 12:12:13)
Some Thoughts computer exploration (spoiler) by Charlie (2009-01-02 18:33:28)
Difficulty: 2 of 5Under Square Division (in Just Math)
Posted on 2008-12-31 (2 Comments)
Solution solution by Charlie (2008-12-31 15:39:29)
Difficulty: 3 of 5Under Octo Vertices (in Numbers)
Posted on 2008-12-30 (3 Comments)
Solution computer solution by Charlie (2008-12-30 17:45:22)
Difficulty: 2 of 5Under A great time waster (in Just Math)
Posted on 2008-12-29 (4 Comments)
Solution computer solution by Charlie (2008-12-29 19:04:52)
Difficulty: 2 of 5Under Primed Palindromes (in Numbers)
Posted on 2008-12-27 (3 Comments)
Solution computer solution by Charlie (2008-12-27 23:47:41)
Difficulty: 3 of 5Under Grand Anticipation (in General)
Posted on 2008-12-24 (4 Comments)
Solution Anticipating the end by working back. by Charlie (2008-12-24 17:41:10)
Difficulty: 3 of 5Under Getting Squared With Dates (in Numbers)
Posted on 2008-12-23 (3 Comments)
Solution computer solution (spoiler) by Charlie (2008-12-23 13:36:59)
Difficulty: 4 of 5Under Boats (in Just Math)
Posted on 2008-12-22 (4 Comments)
re: complete solution by Charlie (2008-12-23 11:33:52)
Hints/Tips one case previously considered by Charlie (2008-12-22 14:38:15)
Difficulty: 3 of 5Under Some Factorials Sum Power (in Just Math)
Posted on 2008-12-21 (4 Comments)
Some Thoughts computer exploration by Charlie (2008-12-21 15:18:29)
Difficulty: 2 of 5Under The last locker (in Just Math)
Posted on 2008-12-20 (4 Comments)
Solution computer solution by Charlie (2008-12-21 12:38:01)
Difficulty: 2 of 5Under Locksmith (in Logic)
Posted on 2008-12-19 (10 Comments)
re: No solution yet? Spoiler alert... by Charlie (2008-12-22 14:51:14)
re(3): Any mistake? (possible spoiler) - I forgot the 6 by Charlie (2008-12-20 13:21:28)
re: Any mistake? (possible spoiler) by Charlie (2008-12-19 17:59:31)
Difficulty: 3 of 5Under Power x mod x (in Just Math)
Posted on 2008-12-18 (6 Comments)
Solution computer assisted and researched solution by Charlie (2008-12-18 22:21:47)
Difficulty: 3 of 5Under Geo Pyramid (in Numbers)
Posted on 2008-12-16 (5 Comments)
re(2): a solution by Charlie (2008-12-18 11:22:06)
Solution computer solution by Charlie (2008-12-16 17:53:55)
Difficulty: 2 of 5Under Pier Operator (in Numbers)
Posted on 2008-12-13 (2 Comments)
Solution Without knowing the whole square-root algorithm (computer assisted soln) by Charlie (2008-12-13 19:24:34)
Difficulty: 3 of 5Under Defective Bulbs (in Just Math)
Posted on 2008-12-12 (6 Comments)
re(2): Two solutions for Q 1. by Charlie (2008-12-13 12:37:35)
re(2): Two solutions for Q 1. by Charlie (2008-12-13 12:24:17)
Difficulty: 2 of 5Under Four special natural numbers (in Just Math)
Posted on 2008-12-11 (8 Comments)
Some Thoughts re: Is there a pattern to this? by Charlie (2008-12-12 11:18:18)
Some Thoughts computer exploration--is there a pattern to this? by Charlie (2008-12-12 00:17:29)
Difficulty: 3 of 5Under Prime Central (in Numbers)
Posted on 2008-12-10 (8 Comments)
some cases where diagonals work in both directions without repetition by Charlie (2008-12-11 17:42:17)
for the x with the fewest possibilities (other than zero) by Charlie (2008-12-10 21:12:11)
Solution One example of each possible x. by Charlie (2008-12-10 20:36:39)
Difficulty: 3 of 5Under Digital Sum 11 (in Numbers)
Posted on 2008-12-08 (5 Comments)
Solution solution by Charlie (2008-12-08 14:09:27)
Difficulty: 2 of 5Under Constructing a right triangle (in Geometry)
Posted on 2008-12-07 (6 Comments)
Solution How to do that. by Charlie (2008-12-07 18:09:55)
Difficulty: 2 of 5Under Succinct months (in General)
Posted on 2008-12-06 (2 Comments)
Solution computer solution by Charlie (2008-12-06 18:58:44)
Difficulty: 3 of 5Under Minimum time (in Calculus)
Posted on 2008-12-04 (6 Comments)
re: No calculus involved by Charlie (2008-12-06 13:06:57)
Difficulty: 2 of 5Under Just ones and nines (in Numbers)
Posted on 2008-12-03 (3 Comments)
Solution computer solution by Charlie (2008-12-03 18:20:24)
Difficulty: 3 of 5Under Prime all (in Numbers)
Posted on 2008-12-01 (6 Comments)
re(2): Hmmm... Computer by Charlie (2008-12-02 01:15:35)
Some Thoughts Hmmm... Computer "Solution"? by Charlie (2008-12-01 16:40:58)
Difficulty: 3 of 5Under one, two, six, mod alphametics (in Numbers)
Posted on 2008-11-30 (2 Comments)
Solution computer solution by Charlie (2008-11-30 21:44:26)
Difficulty: 3 of 5Under Triangle Area (in Geometry)
Posted on 2008-11-28 (12 Comments)
re: Solution by Charlie (2008-12-01 11:53:30)
re: solution barring algebraic screw-up by Charlie (2008-12-01 03:42:52)
re: easier by Charlie (2008-11-30 15:42:29)
re: computer aided solution by Charlie (2008-11-30 15:29:04)
Difficulty: 2 of 5Under The 90 turkeys (in Just Math)
Posted on 2008-11-27 (13 Comments)
Solution re(2): additional solution for non-whole dollar prices - missing something by Charlie (2008-12-03 13:32:19)
Solution additional solution for non-whole dollar prices by Charlie (2008-12-02 18:49:12)
Solution all 2-step solutions with integral dollar prices by Charlie (2008-12-02 18:44:04)
Difficulty: 2 of 5Under Curious Consecutive Cyphers (in Just Math)
Posted on 2008-11-25 (5 Comments)
re: Solution by Charlie (2008-11-25 17:30:13)
Solution solution by Charlie (2008-11-25 16:44:29)
Difficulty: 2 of 5Under one/five = .two (in Numbers)
Posted on 2008-11-24 (3 Comments)
Solution computer solution by Charlie (2008-11-24 18:33:35)
Difficulty: 2 of 5Under Singular squares (in Numbers)
Posted on 2008-11-23 (3 Comments)
Solution computer solution by Charlie (2008-11-23 17:43:16)
Difficulty: 2 of 5Under Some Sum Squares To Product (in Just Math)
Posted on 2008-11-22 (1 Comments)
Solution computer solution by Charlie (2008-11-22 19:57:52)
Difficulty: 3 of 5Under The Courier (in Logic)
Posted on 2008-11-21 (10 Comments)
A start for map 1. by Charlie (2008-11-21 13:02:12)
Difficulty: 2 of 5Under Arranging numbers in a row (in Numbers)
Posted on 2008-11-20 (12 Comments)
re(2): computer solution ---- can you check, please? by Charlie (2008-11-21 00:56:17)
re: Re Charlie's by Charlie (2008-11-21 00:53:11)
Solution computer solution by Charlie (2008-11-20 17:21:55)
Difficulty: 2 of 5Under Going Maximum With Deleted Digits (in Just Math)
Posted on 2008-11-17 (1 Comments)
Solution solution by Charlie (2008-11-17 16:10:24)
Difficulty: 2 of 5Under Flaps, Fleps, Flips, Flops, and Flups (in Logic)
Posted on 2008-11-16 (5 Comments)
re: On the record by Charlie (2008-11-16 18:51:43)
re: Even combined, all answers a far short of 42. by Charlie (2008-11-16 16:25:29)
Difficulty: 2 of 5Under Digital power (in Just Math)
Posted on 2008-11-15 (6 Comments)
Solution computer solution by Charlie (2008-11-15 16:44:23)
Difficulty: 2 of 5Under Building a ruler (in General)
Posted on 2008-11-14 (11 Comments)
re: 16 cm by Charlie (2008-11-17 13:13:39)
Solution solution by Charlie (2008-11-14 18:06:03)
Difficulty: 3 of 5Under The farmer and the pig (in Calculus)
Posted on 2008-11-13 (6 Comments)
re: Analytical Solution by Charlie (2008-11-17 16:06:52)
Solution numerical integration (spoiler) by Charlie (2008-11-13 18:43:08)
Difficulty: 2 of 5Under Ten, Thousand and Then ….. (in Just Math)
Posted on 2008-11-12 (2 Comments)
Solution solution by Charlie (2008-11-12 13:45:13)
Difficulty: 2 of 5Under Balls in an urn (in Probability)
Posted on 2008-11-11 (4 Comments)
Solution computer trial and error by Charlie (2008-11-11 18:22:28)
Difficulty: 2 of 5Under Focusing Upon Couscous (in Just Math)
Posted on 2008-11-10 (3 Comments)
Solution computer solution by Charlie (2008-11-10 17:53:18)
Difficulty: 3 of 5Under A remarkable multiplication (in Just Math)
Posted on 2008-11-09 (3 Comments)
Solution computer solution by Charlie (2008-11-09 19:49:36)
Difficulty: 2 of 5Under Going Digital With Pythagoras (in Just Math)
Posted on 2008-11-08 (3 Comments)
Solution computer solution by Charlie (2008-11-08 17:12:49)
Difficulty: 3 of 5Under Digits 0-9 In Reverse (in Just Math)
Posted on 2008-11-07 (2 Comments)
Solution examples (spoiler) by Charlie (2008-11-07 13:39:24)
Difficulty: 3 of 5Under 3 points in a line (in General)
Posted on 2008-11-06 (4 Comments)
re(2): Proof by Charlie (2008-12-14 13:03:37)
Difficulty: 2 of 5Under The 3 containers (in Just Math)
Posted on 2008-11-05 (5 Comments)
re: Initial observation by Charlie (2008-11-05 22:10:24)
Solution solution by Charlie (2008-11-05 22:08:31)
Difficulty: 2 of 5Under All divisible by 7 (in Just Math)
Posted on 2008-11-04 (8 Comments)
re: Proof and Extensions by Charlie (2008-11-06 11:47:26)
Question re: proof not understood by Charlie (2008-11-04 16:34:49)
Solution computer-assisted proof by Charlie (2008-11-04 13:19:14)
Difficulty: 2 of 5Under Remainder With 3’s And 7’s (in Just Math)
Posted on 2008-11-02 (3 Comments)
Solution computer solution by Charlie (2008-11-02 23:43:33)
Difficulty: 2 of 5Under Quartic And Near Pandigital (in Just Math)
Posted on 2008-11-01 (2 Comments)
Solution solution by Charlie (2008-11-01 19:21:28)
Difficulty: 2 of 5Under f(1998) (in Just Math)
Posted on 2008-10-31 (5 Comments)
Solution computer solution (spoiler) by Charlie (2008-10-31 14:23:37)
Difficulty: 3 of 5Under Positively congruent to a T (in Just Math)
Posted on 2008-10-30 (1 Comments)
Solution computer solution (spoiler) by Charlie (2008-10-30 11:10:06)
Difficulty: 3 of 5Under Sequence Group III (in Just Math)
Posted on 2008-10-28 (5 Comments)
Solution proof--thanks to Dej Mar's formula by Charlie (2008-10-29 11:58:22)
Solution computer solutions -- no proof by Charlie (2008-10-28 18:58:53)
Difficulty: 2 of 5Under The slug and the snail (in Just Math)
Posted on 2008-10-27 (7 Comments)
re(3): a solution by Charlie (2008-10-28 09:58:38)
Solution re: a solution by Charlie (2008-10-27 23:06:37)
Difficulty: 3 of 5Under Freecell Addiction (in Probability)
Posted on 2008-10-26 (3 Comments)
Some Thoughts heuristics by Charlie (2008-10-26 13:40:46)
Difficulty: 3 of 5Under Even Digit Perfect Square(s) (in Just Math)
Posted on 2008-10-25 (10 Comments)
Solution re: SLOANE A103705 (spoiler) by Charlie (2008-10-25 17:05:34)
Difficulty: 3 of 5Under Going maximum with factorial(s) (in Just Math)
Posted on 2008-10-24 (2 Comments)
Some Thoughts algebraic exploration (proof?) by Charlie (2008-10-24 13:11:27)
Some Thoughts computer exploration (spoiler? -- UBASIC program) by Charlie (2008-10-24 12:34:10)
Difficulty: 2 of 5Under True coins, fake coins (in Weights and Scales)
Posted on 2008-10-23 (9 Comments)
re: really? by Charlie (2013-02-27 14:24:32)
re(2): better -- within the constraints of the puzzle by Charlie (2008-10-24 01:57:08)
Solution better -- within the constraints of the puzzle by Charlie (2008-10-23 15:57:17)
Some Thoughts not quite -- my best by Charlie (2008-10-23 13:35:52)
Difficulty: 3 of 5Under Pretty Potent Power Pair(s) (in Just Math)
Posted on 2008-10-22 (2 Comments)
Solution computer-assisted proof by Charlie (2008-10-22 11:44:45)
Difficulty: 2 of 5Under Cows, horses and dogs (in Just Math)
Posted on 2008-10-20 (13 Comments)
Solution computer solution by Charlie (2008-10-20 12:22:28)
Difficulty: 3 of 5Under Maximum Power 2 Divide Evenly (in Just Math)
Posted on 2008-10-19 (2 Comments)
Solution computer solution by Charlie (2008-10-19 14:36:08)
Difficulty: 2 of 5Under Top four people (in Logic)
Posted on 2008-10-18 (4 Comments)
Solution computer solution by Charlie (2008-10-18 15:14:19)
Difficulty: 3 of 5Under Absolute Value And Real Constant (in Just Math)
Posted on 2008-10-17 (6 Comments)
Solution solution by Charlie (2008-10-17 15:10:31)
Difficulty: 2 of 5Under maximum square folding (in Geometry)
Posted on 2008-10-16 (3 Comments)
Solution numerical solution by Charlie (2008-10-16 15:44:40)
Difficulty: 2 of 5Under Inversely Integrating An Inverse (in Calculus)
Posted on 2008-10-15 (3 Comments)
Solution re: Numerical answer -- then Google search by Charlie (2008-10-15 13:11:25)
Solution Numerical answer by Charlie (2008-10-15 12:28:38)
Difficulty: 3 of 5Under Getting the bases with aabbcc (in Just Math)
Posted on 2008-10-07 (5 Comments)
re: only one by Charlie (2008-10-07 13:13:20)
Solution solutions by Charlie (2008-10-07 13:03:41)
Difficulty: 2 of 5Under Remainder With Square And Cube (in Just Math)
Posted on 2008-10-05 (3 Comments)
Solution solution by Charlie (2008-10-05 14:19:47)
Difficulty: 4 of 5Under Power 2 Sum Power 3 And 5 (in Just Math)
Posted on 2008-10-04 (11 Comments)
re(3): Charlie --asking more by Charlie (2008-10-05 19:12:03)
re: asking Charlie -- more detail by Charlie (2008-10-05 12:51:05)
re: asking Charlie by Charlie (2008-10-05 11:29:30)
Solution computer solution--no proof of completeness by Charlie (2008-10-04 15:48:05)
Difficulty: 2 of 5Under Divisible by 11,111 (in Just Math)
Posted on 2008-10-02 (7 Comments)
re: Trivial Solution by Charlie (2008-10-02 12:48:37)
Solution computer solution (spoiler) by Charlie (2008-10-02 12:40:46)
Difficulty: 2 of 5Under Exactly 20 games (in Just Math)
Posted on 2008-10-01 (5 Comments)
re: Trivial solution?? by Charlie (2008-10-02 12:53:48)
Difficulty: 3 of 5Under Primes in arithmetic progression (in Just Math)
Posted on 2008-09-30 (9 Comments)
re: Well... by Charlie (2008-10-01 11:10:14)
Solution computer solution by Charlie (2008-09-30 13:16:46)
Difficulty: 3 of 5Under Going Maximum With Arithmetic (in Just Math)
Posted on 2008-09-27 (5 Comments)
re: Solution by Charlie (2008-09-28 02:58:58)
Solution computer solution by Charlie (2008-09-27 16:40:32)
Difficulty: 1 of 5Under 25 balls (in Probability)
Posted on 2008-09-25 (8 Comments)
Solution solution by Charlie (2008-09-25 12:21:40)
Difficulty: 3 of 5Under Classroom Dice (in Numbers)
Posted on 2008-09-24 (7 Comments)
Puzzle correction by Charlie (2008-09-24 16:32:08)
Difficulty: 3 of 5Under Odd Digits 2 Differ Adjacently (in Just Math)
Posted on 2008-09-22 (5 Comments)
re: Solution by Charlie (2008-09-23 10:33:15)
Solution re: computer-aided solution by Charlie (2008-09-22 17:47:13)
Solution computer-aided solution by Charlie (2008-09-22 15:00:34)
Difficulty: 2 of 5Under Pairs of primes (in Numbers)
Posted on 2008-09-21 (3 Comments)
Solution Each of the 192 such sequences ... by Charlie (2008-09-21 13:29:06)
Difficulty: 2 of 5Under Trigonometric relationship (in Just Math)
Posted on 2008-09-19 (2 Comments)
Solution from inside out -- spoiler by Charlie (2008-09-19 13:06:13)
Difficulty: 3 of 5Under 2 + 2 = 5 (in Just Math)
Posted on 2008-09-16 (7 Comments)
Solution A simple modification -- trivial solution by Charlie (2008-09-16 10:48:11)
Difficulty: 2 of 5Under The mouse and the cheese (in Probability)
Posted on 2008-09-11 (4 Comments)
Solution re: solution by Charlie (2008-09-11 13:56:10)
Difficulty: 2 of 5Under Somewhere Near the Center (in Shapes)
Posted on 2008-09-09 (3 Comments)
Solution solution by Charlie (2008-09-09 16:15:31)
Difficulty: 2 of 5Under Product of Ratios (in Geometry)
Posted on 2008-09-08 (2 Comments)
Solution The Geometer's Sketchpad Answer (spoiler) by Charlie (2008-09-08 14:58:29)
Difficulty: 2 of 5Under Getting Floored With 28 (in Just Math)
Posted on 2008-09-06 (4 Comments)
Solution re: solution by Charlie (2008-09-07 02:18:55)
Some Thoughts solution by Charlie (2008-09-06 15:22:22)
Difficulty: 2 of 5Under Students in a tournament (in Just Math)
Posted on 2008-09-05 (7 Comments)
Solution solution by Charlie (2008-09-05 13:23:20)
Difficulty: 2 of 5Under Doubles on reverse (in Just Math)
Posted on 2008-09-02 (3 Comments)
Some Thoughts computer exploration -- some answers given by Charlie (2008-09-02 17:43:46)
Difficulty: 4 of 5Under MultiSquares (in Just Math)
Posted on 2008-08-28 (2 Comments)
Solution solution by Charlie (2008-08-28 12:50:02)
Difficulty: 3 of 5Under Going Cyclic With Geometric (in Just Math)
Posted on 2008-08-27 (3 Comments)
Solution confession, solution (computer) and an observation by Charlie (2008-08-27 12:18:46)
Difficulty: 3 of 5Under Square = Square + Square (in Numbers)
Posted on 2008-08-26 (7 Comments)
Solution re: Solution - brute force by Charlie (2008-08-26 11:50:39)
Difficulty: 2 of 5Under Trisecting an angle (in Geometry)
Posted on 2008-08-24 (8 Comments)
Solution solution by Charlie (2008-08-25 10:31:45)
Difficulty: 2 of 5Under No repeated numbers (in Logic)
Posted on 2008-08-20 (20 Comments)
Solution 2880 solutions; 6 Hitori by Charlie (2008-08-24 13:10:41)
Solution Computer solution at last by Charlie (2008-08-23 17:11:48)
re: A look at minimality by Charlie (2008-08-22 10:51:57)
Difficulty: 2 of 5Under ID Number And Digit Arrangement (in Numbers)
Posted on 2008-08-19 (9 Comments)
re(3): Hmmmmm.... (spoilers) by Charlie (2008-08-20 10:16:46)
re(3): Hmmmmm.... (spoilers) by Charlie (2008-08-20 10:10:54)
Solution Hmmmmm.... (spoilers) by Charlie (2008-08-19 12:39:09)
Difficulty: 2 of 5Under 1111 (in Just Math)
Posted on 2008-08-18 (3 Comments)
Solution computer solution by Charlie (2008-08-18 18:39:44)
Difficulty: 3 of 5Under Six Digits = Triangle + Triangle (in Numbers)
Posted on 2008-08-17 (3 Comments)
Solution computer solution (spoiler) by Charlie (2008-08-17 18:58:46)
Difficulty: 3 of 5Under Subtract 1 from squared abbbb (in Just Math)
Posted on 2008-08-16 (6 Comments)
Solution Yes, it's trivial with a computer program by Charlie (2008-08-17 13:35:13)
Difficulty: 2 of 5Under A domino puzzle (in Logic)
Posted on 2008-08-15 (3 Comments)
Solution re: Pencil and paper solution. by Charlie (2008-08-15 12:22:27)
Solution Pencil and paper solution. by Charlie (2008-08-15 12:16:00)
Difficulty: 2 of 5Under Evaluate this remainder (in Just Math)
Posted on 2008-08-13 (6 Comments)
Solution re: Rereading (solution; spoiler) by Charlie (2008-08-13 11:14:51)
Difficulty: 3 of 5Under Password in an ATM (in Probability)
Posted on 2008-08-11 (3 Comments)
Solution analytic and computer solutions by Charlie (2008-08-11 14:24:17)
Difficulty: 2 of 5Under Where is the arsenic? (in Logic)
Posted on 2008-08-10 (6 Comments)
Solution solution by Charlie (2008-08-10 16:37:35)
Difficulty: 4 of 5Under Four 3s Rotated (in Word Problems)
Posted on 2008-08-06 (16 Comments)
Solution re(2): A challenge...or a good talking point by Charlie (2008-08-10 11:06:04)
Solution the ones that can be rotated both ways by Charlie (2008-08-07 11:09:02)
re: computer solutions by Charlie (2008-08-06 17:13:58)
Solution computer solutions by Charlie (2008-08-06 17:03:38)
Difficulty: 2 of 5Under Father and son (in Just Math)
Posted on 2008-08-04 (11 Comments)
Solution computer solution (spoiler) by Charlie (2008-08-04 16:33:44)
Difficulty: 3 of 5Under Minimum area of a triangle (in Just Math)
Posted on 2008-07-30 (10 Comments)
re(4): Computer Solution by Charlie (2008-07-31 11:10:06)
re: Computer Solution by Charlie (2008-07-30 18:51:00)
re(2): Computer Solution by Charlie (2008-07-30 18:47:01)
Difficulty: 3 of 5Under 'Snake-Eyes ' Joe (in Probability)
Posted on 2008-07-28 (14 Comments)
Solution a solution by Charlie (2008-07-28 16:38:13)
Difficulty: 2 of 5Under Identify the cities (in General)
Posted on 2008-07-25 (9 Comments)
re: More than one Path by Charlie (2008-07-26 09:38:56)
Solution solution by Charlie (2008-07-25 11:51:00)
Difficulty: 2 of 5Under King to F1 (in Games)
Posted on 2008-07-23 (8 Comments)
re(2): cheating computer solution by Charlie (2008-07-28 16:40:28)
re(2): cheating computer solution by Charlie (2008-07-28 12:17:29)
Solution other solutions by Charlie (2008-07-24 15:11:10)
Solution cheating computer solution by Charlie (2008-07-24 15:07:28)
Difficulty: 4 of 5Under Star Stare (in Word Problems)
Posted on 2008-07-16 (10 Comments)
Solution computer solutions by Charlie (2008-07-16 15:40:41)
Difficulty: 2 of 5Under Roulette anyone? (in Just Math)
Posted on 2008-07-13 (4 Comments)
Solution re(2): solution by Charlie (2008-07-14 11:11:26)
Solution solution by Charlie (2008-07-13 18:31:33)
Difficulty: 4 of 5Under Extended Knight's Tour (in Logic)
Posted on 2008-07-10 (8 Comments)
Solution computer solution (spoiler)--mostly comparison of computer languages by Charlie (2008-07-11 10:43:12)
Difficulty: 2 of 5Under The five 3´s (in Just Math)
Posted on 2008-07-07 (35 Comments)
re(5): all hundred by Charlie (2008-07-09 11:45:00)
re(6): all hundred by Charlie (2008-07-09 11:40:10)
re(5): all hundred by Charlie (2008-07-09 11:39:07)
Solution re(4): all hundred by Charlie (2008-07-09 11:37:35)
Solution all hundred by Charlie (2008-07-08 14:14:34)
Solution the shortest representation of each by Charlie (2008-07-08 12:15:01)
Solution re(5): all the asked-for numbers (spoilers) by Charlie (2008-07-08 11:48:29)
Solution re(4): all the asked-for numbers (spoilers) by Charlie (2008-07-08 11:47:42)
Solution re(3): all the asked-for numbers (spoilers) by Charlie (2008-07-08 11:46:47)
re(2): all the asked-for numbers (spoilers) by Charlie (2008-07-08 11:45:10)
Solution re: all the asked-for numbers (spoilers) by Charlie (2008-07-08 11:43:59)
Solution all the asked-for numbers (spoilers) by Charlie (2008-07-08 11:41:52)
still not all, even with exponentiation (spoilers present) by Charlie (2008-07-07 15:51:13)
still not all, even with exponentiation (spoilers present) by Charlie (2008-07-07 15:51:06)
Solution geeky computer solution for some values (spoilers present) by Charlie (2008-07-07 14:47:24)
Difficulty: 3 of 5Under Some Powers Sum Square (in Just Math)
Posted on 2008-07-04 (10 Comments)
re: A084703 by Charlie (2008-07-04 23:13:56)
Difficulty: 1 of 5Under Two English words (in Word Problems)
Posted on 2008-06-27 (9 Comments)
re(2): I'd go for ......... by Charlie (2008-06-28 13:20:52)
Difficulty: 3 of 5Under Literal Overlap (in Word Problems)
Posted on 2008-06-24 (9 Comments)
re: No Calculations made by Charlie (2008-06-29 12:01:49)
Solution a solution by Charlie (2008-06-24 19:19:51)
Difficulty: 2 of 5Under A billiard challenge (in Geometry)
Posted on 2008-06-23 (4 Comments)
Solution computer solution: 8 ways by Charlie (2008-06-23 15:49:43)
Difficulty: 3 of 5Under Gyro Lattice 3 - Values (in Numbers)
Posted on 2008-06-22 (6 Comments)
Solution computer solutions by Charlie (2008-06-23 02:25:44)
Difficulty: 2 of 5Under Perfect Square Too (in Just Math)
Posted on 2008-06-21 (6 Comments)
Some Thoughts computer findings (possible spoiler) by Charlie (2008-06-21 17:47:34)
Difficulty: 3 of 5Under Devious Kinder Blocks (in Tricks)
Posted on 2008-06-18 (8 Comments)
re(4): A sequential look.... by Charlie (2008-06-19 10:16:32)
Difficulty: 2 of 5Under Water at 76º C (in Weights and Scales)
Posted on 2008-06-17 (5 Comments)
Solution Step Details for 75 and 76 by Charlie (2008-06-18 11:05:44)
Solution aha!; now I've got it (spoiler) by Charlie (2008-06-17 16:28:06)
Some Thoughts Computer exploration (spoiler?); is this it? by Charlie (2008-06-17 16:07:02)
Difficulty: 3 of 5Under Mutually Perpendicular Medians (in Geometry)
Posted on 2008-06-14 (4 Comments)
Solution solution by Charlie (2008-06-14 12:04:37)
Difficulty: 3 of 5Under The missing piece (chess) (in Games)
Posted on 2008-06-12 (15 Comments)
re(2): An impossible check?? (partial spoiler) by Charlie (2008-06-12 13:14:13)
Difficulty: 3 of 5Under 10 cell phones and 10 numbers (in Probability)
Posted on 2008-06-11 (11 Comments)
Solution re(4): Solution? by Charlie (2008-06-11 19:53:25)
Solution re(2): Solution? by Charlie (2008-06-11 18:17:40)
Difficulty: 2 of 5Under Four cars (in Just Math)
Posted on 2008-06-09 (7 Comments)
Solution solution by Charlie (2008-06-09 13:40:19)
Difficulty: 3 of 5Under Venn Olympics (in Numbers)
Posted on 2008-06-08 (8 Comments)
Question re(2): Solution by Charlie (2008-06-09 12:20:00)
Difficulty: 3 of 5Under Evaluate this infinite product (in Calculus)
Posted on 2008-06-05 (5 Comments)
Some Thoughts For what it's worth (numerical value) by Charlie (2008-06-05 12:27:29)
Difficulty: 3 of 5Under A Tri Star Issue (in Numbers)
Posted on 2008-06-01 (17 Comments)
Solution Might as well diagram the 94 difference-4, adjacent-vertex solutions. by Charlie (2008-06-02 22:29:47)
Solution The final "tease" solutions; worked out correctly this time, I hope. by Charlie (2008-06-02 09:49:16)
re(2): computer solution; spoiler by Charlie (2008-06-02 00:24:25)
Solution re: computer solution; spoiler by Charlie (2008-06-02 00:06:57)
Solution computer solution; spoiler by Charlie (2008-06-01 23:56:16)
re: Possible mistake? by Charlie (2008-06-01 13:22:39)
Difficulty: 2 of 5Under The Diamond Caper (in Famous Riddles)
Posted on 2008-05-31 (8 Comments)
re: Too Hard (possible spoiler) by Charlie (2008-06-01 11:50:11)
Difficulty: 3 of 5Under Orthogonal Circle (in Geometry)
Posted on 2008-05-25 (4 Comments)
re: What is geometric construction? by Charlie (2008-05-26 12:56:51)
Difficulty: 2 of 5Under What a difference two roots make ! (in Calculus)
Posted on 2008-05-24 (5 Comments)
Solution re: Solution by Charlie (2008-05-25 13:33:08)
Difficulty: 2 of 5Under Sum Greatest And Least Roots (in Just Math)
Posted on 2008-05-22 (3 Comments)
re: answer by Charlie (2008-05-23 00:10:42)
Some Thoughts thoughts by Charlie (2008-05-22 17:23:07)
Difficulty: 3 of 5Under Subsquares (in Numbers)
Posted on 2008-05-21 (9 Comments)
re: Who's on First? by Charlie (2008-05-21 12:30:15)
Difficulty: 3 of 5Under Center of Gravity of Perimeter (in Geometry)
Posted on 2008-05-18 (14 Comments)
Solution re(3): solution by Charlie (2008-05-20 11:04:47)
re: C of G by Charlie (2008-05-19 12:19:01)
re: solution by Charlie (2008-05-19 12:14:45)
re(2): Centroid invariance in the face of increasing triangle size by Charlie (2008-05-19 12:05:01)
re: Centroid invariance in the face of increasing triangle size by Charlie (2008-05-19 11:52:37)
Solution simple but not simple by Charlie (2008-05-18 18:02:26)
Difficulty: 2 of 5Under ABC's Of Greatest Power (in Calculus)
Posted on 2008-05-16 (2 Comments)
Solution solution by Charlie (2008-05-16 16:45:37)
Difficulty: 3 of 5Under Locus of Triangle (in Geometry)
Posted on 2008-05-15 (5 Comments)
re: Solution? by Charlie (2008-05-15 17:16:20)
Solution computer for insight; then the reason by Charlie (2008-05-15 16:44:16)
Difficulty: 3 of 5Under Continental Pole of Inaccessibility (in General)
Posted on 2008-05-14 (17 Comments)
re(2): Somewhat confused by Charlie (2008-05-15 13:16:14)
re: just asking by Charlie (2008-05-15 13:08:50)
Hints/Tips re: Farthest point by Charlie (2008-05-14 22:30:34)
re: Encarta solution by Charlie (2008-05-14 16:14:46)
Difficulty: 2 of 5Under Do you have a card? (in Riddles)
Posted on 2008-05-12 (12 Comments)
Some Thoughts At first glance... (spoiler?) by Charlie (2008-05-12 15:39:33)
Difficulty: 2 of 5Under It's right under your nose (from time to time) (in Tricks)
Posted on 2008-05-09 (7 Comments)
well... by Charlie (2008-05-09 12:20:34)
Difficulty: 4 of 5Under Capture the Flag (in Probability)
Posted on 2008-05-04 (11 Comments)
re(3): Extra Credit (Triangle XUV) by Charlie (2008-05-09 12:12:35)
re: Extra Credit (Triangle XUV) by Charlie (2008-05-08 10:29:18)
Solution semi-analytic; semi-computer by Charlie (2008-05-04 18:26:16)
Difficulty: 3 of 5Under Circumcenter, Orthocenter And Angle (in Geometry)
Posted on 2008-05-03 (1 Comments)
Solution Playing with Geometer's Sketchpad by Charlie (2008-05-04 14:00:23)
Difficulty: 3 of 5Under Squares on Cubes (in Numbers)
Posted on 2008-04-30 (21 Comments)
re: better classification of results by Charlie (2008-05-03 10:21:36)
re: better classification of results by Charlie (2008-05-03 10:05:25)
Solution better classification of results by Charlie (2008-05-03 10:03:13)
re(2): Computer solutions by Charlie (2008-05-02 17:36:42)
Solution re: Computer solutions by Charlie (2008-05-02 17:23:07)
Solution Computer solutions by Charlie (2008-05-02 17:10:57)
Question Biggest problem I see! by Charlie (2008-05-02 00:50:53)
re: Clarifications?? by Charlie (2008-04-30 15:37:46)
Difficulty: 1 of 5Under 1,000 (in Tricks)
Posted on 2008-04-28 (18 Comments)
Some Thoughts Ummmm.... by Charlie (2008-04-28 12:44:49)
Difficulty: 2 of 5Under Absolutely Greatest (in Calculus)
Posted on 2008-04-27 (2 Comments)
Solution solution by Charlie (2008-04-27 18:58:18)
Difficulty: 2 of 5Under Rumor Rithmetic (in Numbers)
Posted on 2008-04-25 (3 Comments)
Solution computer aided solution (spoiler) by Charlie (2008-04-25 16:09:17)
Difficulty: 2 of 5Under Rooting For The Limit (in Calculus)
Posted on 2008-04-23 (6 Comments)
re: Solution by Charlie (2008-04-23 17:23:23)
Some Thoughts computer exploration (possible spoiler) by Charlie (2008-04-23 11:36:44)
Difficulty: 3 of 5Under Additively Quadratic (in Just Math)
Posted on 2008-04-19 (6 Comments)
re: Analytic solution by Charlie (2008-04-19 17:50:58)
Some Thoughts computer exploration (probable spoiler) by Charlie (2008-04-19 12:55:35)
Difficulty: 3 of 5Under Stella and the Statistical Six (in Just Math)
Posted on 2008-04-18 (1 Comments)
Solution computer solution by Charlie (2008-04-18 15:39:16)
Difficulty: 4 of 5Under A rectangle Around A rhombus (in Geometry)
Posted on 2008-04-14 (14 Comments)
re: How odd! In answer to Charlie: computer solution for part 1 by Charlie (2008-04-15 10:24:14)
re: computer solution for part 1 by Charlie (2008-04-14 15:53:39)
Solution computer solution for part 1 by Charlie (2008-04-14 15:34:31)
re: Here it is by Charlie (2008-04-14 14:16:35)
Difficulty: 2 of 5Under Curious Real Additive Relationship (in Just Math)
Posted on 2008-04-12 (5 Comments)
Solution solution by Charlie (2008-04-12 14:26:33)
Difficulty: 3 of 5Under Penny Piles (in Numbers)
Posted on 2008-04-09 (6 Comments)
Note on posted solution by Charlie (2008-04-13 12:21:41)
Difficulty: 2 of 5Under You, versus Bobby Fisher (in Just Math)
Posted on 2008-04-05 (4 Comments)
re(2): part 1 by Charlie (2008-04-06 03:01:27)
Solution part 1 by Charlie (2008-04-05 14:26:54)
Difficulty: 2 of 5Under Real Powerful Logarithms (in Just Math)
Posted on 2008-04-04 (4 Comments)
re: solution by Charlie (2008-04-04 13:25:50)
Solution solution by Charlie (2008-04-04 13:22:33)
Difficulty: 4 of 5Under Knave Contest (in Liars and Knights)
Posted on 2008-04-03 (8 Comments)
Solution computer solution by Charlie (2008-04-03 14:34:52)
Difficulty: 3 of 5Under Who's Younger? (in Liars and Knights)
Posted on 2008-04-01 (10 Comments)
re: No ambiguity at all by Charlie (2008-04-02 10:12:11)
Difficulty: 3 of 5Under Intersection And Maximum Triangle (in Geometry)
Posted on 2008-03-30 (5 Comments)
Solution re: Well..... correction by Charlie (2008-03-30 17:32:36)
re: Well..... by Charlie (2008-03-30 17:07:15)
re: Well..... (the program) by Charlie (2008-03-30 16:48:15)
Some Thoughts Well..... by Charlie (2008-03-30 16:42:55)
Difficulty: 4 of 5Under Dao Juxing (The way of the rectangle) (in Shapes)
Posted on 2008-03-28 (6 Comments)
re: That's puzzling (to Charlie) by Charlie (2008-03-29 01:37:26)
re: A similar conclusion by Charlie (2008-03-28 20:25:01)
actual numbers by Charlie (2008-03-28 14:50:35)
Solution Am I missing something? (spoiler?) by Charlie (2008-03-28 11:15:12)
Difficulty: 3 of 5Under 18 Queens (in General)
Posted on 2008-03-25 (7 Comments)
re: No Subject by Charlie (2008-03-25 11:03:23)
Some Thoughts Almost, but not quite by Charlie (2008-03-25 10:18:36)
Difficulty: 2 of 5Under Going Greatest With Arithmetic, Geometric And Harmonic (in Just Math)
Posted on 2008-03-22 (5 Comments)
re(2): solutions by Charlie (2008-03-23 10:25:17)
Solution solutions by Charlie (2008-03-22 15:17:21)
Difficulty: 3 of 5Under Animal Magic (in Numbers)
Posted on 2008-03-21 (6 Comments)
re(2): Well, if you only rely on two ... (computer solution; spoiler) by Charlie (2008-03-21 21:57:26)
Solution Well, if you only rely on two ... (computer solution; spoiler) by Charlie (2008-03-21 12:24:40)
Difficulty: 3 of 5Under Circular Balance (in Weights and Scales)
Posted on 2008-03-20 (22 Comments)
re(2): Minimum? by Charlie (2008-03-21 09:22:15)
Solution part 1 solution by Charlie (2008-03-20 12:24:39)
Difficulty: 3 of 5Under Edge Numbered Cube (in General)
Posted on 2008-03-19 (1 Comments)
Solution computer solution (spoiler) by Charlie (2008-03-19 18:41:48)
Difficulty: 3 of 5Under Triangulation of Numbers (in Geometry)
Posted on 2008-03-18 (7 Comments)
re(2): solution by Charlie (2008-03-19 09:22:57)
Solution solution by Charlie (2008-03-18 10:50:27)
Difficulty: 3 of 5Under Three Points in a Square (in Probability)
Posted on 2008-03-17 (18 Comments)
re(4): Not faster, simpler, or better by Charlie (2008-03-18 17:01:00)
re(4): Not faster, simpler, or better by Charlie (2008-03-18 16:49:16)
re(2): Not faster, simpler, or better by Charlie (2008-03-18 10:45:45)
Solution re: I give up! (spoiler) by Charlie (2008-03-17 16:28:55)
Solution computer exploration -- Monte Carlo method by Charlie (2008-03-17 13:21:49)
Difficulty: 3 of 5Under Getting Four-Six With Nine Digits (in Numbers)
Posted on 2008-03-16 (9 Comments)
Solution re(2): computer solution by Charlie (2008-03-16 20:33:46)
Solution computer solution by Charlie (2008-03-16 16:03:15)
Difficulty: 4 of 5Under Tangent with Straightedge (in Geometry)
Posted on 2008-03-13 (8 Comments)
re: Seriously by Charlie (2008-03-15 10:11:24)
Difficulty: 3 of 5Under Pick a card, any card.. (in Probability)
Posted on 2008-03-11 (37 Comments)
re(2): .. what went wrong .. by Charlie (2008-03-25 11:36:53)
re(2): A fair amount? by Charlie (2008-03-13 21:33:33)
re: Winning Strategy by Charlie (2008-03-13 12:51:16)
re: Incorrect assumption by Charlie (2008-03-12 15:49:09)
the posted official solution is wrong by Charlie (2008-03-12 15:44:49)
re(2): Incorrect assumption by Charlie (2008-03-12 15:20:55)
re: Incorrect assumption by Charlie (2008-03-12 11:18:43)
re(3): When to play and when to cease drawing. by Charlie (2008-03-12 11:11:42)
re: When to play and when to cease drawing. by Charlie (2008-03-11 23:15:11)
re(5): What's the catch? - it's not that simple by Charlie (2008-03-11 22:48:18)
re: Table of Fair Amount by Charlie (2008-03-11 16:56:09)
re(3): What's the catch? - it's not that simple by Charlie (2008-03-11 16:09:16)
re(2): What's the catch? - it's not that simple by Charlie (2008-03-11 15:52:31)
re(3): solution--I think by Charlie (2008-03-11 15:46:22)
Solution solution--I think by Charlie (2008-03-11 14:41:49)
Difficulty: 2 of 5Under Empower With X and 0.4 (in Just Math)
Posted on 2008-03-10 (7 Comments)
re: computer exploration (spoiler) by Charlie (2008-03-10 17:42:56)
re: computer exploration (spoiler) by Charlie (2008-03-10 16:21:10)
Solution computer exploration (spoiler) by Charlie (2008-03-10 16:15:52)
Difficulty: 3 of 5Under Subtract From Product, Get Integer (in Just Math)
Posted on 2008-03-08 (3 Comments)
Solution computer search (spoiler; no proof) by Charlie (2008-03-08 12:50:42)
Difficulty: 3 of 5Under ABCD (2) (in Logic)
Posted on 2008-03-07 (20 Comments)
re: Thanks for the clues! by Charlie (2008-03-10 10:20:30)
Solution computer solution (spoiler) by Charlie (2008-03-07 12:52:02)
Difficulty: 3 of 5Under 3 Distinct Roots Not (in Just Math)
Posted on 2008-03-04 (4 Comments)
Solution solution by Charlie (2008-03-04 11:13:44)
Difficulty: 3 of 5Under Inradius and Perimeter (in Just Math)
Posted on 2008-02-26 (3 Comments)
re: computer exploration -- not proof -- spoiler -- finer grid by Charlie (2008-02-26 12:27:11)
Solution computer exploration -- not proof -- spoiler by Charlie (2008-02-26 12:17:43)
Difficulty: 2 of 5Under Factorial and a Square (in Numbers)
Posted on 2008-02-23 (9 Comments)
re: No Subject by Charlie (2008-02-23 14:54:44)
Difficulty: 3 of 5Under Sum Term Reciprocals (in Sequences)
Posted on 2008-02-22 (3 Comments)
Solution computer solution -- not proof (spoiler) by Charlie (2008-02-22 11:35:19)
Difficulty: 4 of 5Under South Sea Treasure Hunt (in Liars and Knights)
Posted on 2008-02-21 (5 Comments)
re: Eh? by Charlie (2008-02-21 22:42:19)
Solution computer solution (spoiler) by Charlie (2008-02-21 15:42:21)
Difficulty: 3 of 5Under It's e-asy (in Just Math)
Posted on 2008-02-19 (7 Comments)
re: Solution by Charlie (2008-02-20 11:04:57)
re: computer solution by Charlie (2008-02-19 13:03:43)
Solution computer solution by Charlie (2008-02-19 12:42:02)
Difficulty: 3 of 5Under Worlds in collision (in Just Math)
Posted on 2008-02-16 (1 Comments)
Some Thoughts computer exploration by Charlie (2008-02-16 12:48:43)
Difficulty: 3 of 5Under Given the term, find the number (in Sequences)
Posted on 2008-02-15 (5 Comments)
Solution solution by Charlie (2008-02-15 13:12:30)
Difficulty: 3 of 5Under Truncated Cube (in Shapes)
Posted on 2008-02-14 (11 Comments)
The source of the puzzle by Charlie (2008-02-15 11:56:14)
Difficulty: 3 of 5Under Consecutive Near Palindromes (in Numbers)
Posted on 2008-02-13 (9 Comments)
re: Are there more? by Charlie (2008-02-14 02:24:39)
Solution solution (spoiler) by Charlie (2008-02-13 11:31:25)
Difficulty: 4 of 5Under Forced Win, Forced Loss, or Neutral? (in Paradoxes)
Posted on 2008-02-08 (16 Comments)
re(4): Zero Sum Confusion by Charlie (2008-02-19 10:18:46)
re(2): Zero Sum Confusion by Charlie (2008-02-18 23:33:36)
Difficulty: 3 of 5Under Center of Gravity (in Geometry)
Posted on 2008-02-06 (8 Comments)
re: ???? by Charlie (2008-02-06 16:42:48)
Solution playing with Geometer's Sketchpad (spoiler) by Charlie (2008-02-06 12:45:46)
Difficulty: 2 of 5Under The Triangle's Bottom (in Just Math)
Posted on 2008-02-05 (6 Comments)
Solution solution by Charlie (2008-02-05 14:48:22)
Difficulty: 3 of 5Under Eight Points (in Geometry)
Posted on 2008-02-01 (29 Comments)
re(5): More for Charlie's thoughtful consideration by Charlie (2008-02-06 00:36:23)
re(3): For Charlie's thoughtful consideration by Charlie (2008-02-04 23:29:03)
re: For Charlie's thoughtful consideration by Charlie (2008-02-03 23:46:25)
Solution correction; real answer by Charlie (2008-02-03 12:50:46)
re(6): Further improvement by Charlie (2008-02-03 11:50:52)
re: Summary? by Charlie (2008-02-03 11:23:01)
re(5): Further improvement by Charlie (2008-02-02 12:28:56)
re(4): Further improvement by Charlie (2008-02-02 10:45:59)
re(4): Solution by Charlie (2008-02-02 10:40:29)
Solution re(2): Solution by Charlie (2008-02-02 01:53:25)
re(4): Solution by Charlie (2008-02-01 19:16:38)
Difficulty: 4 of 5Under A Power of an Integer Beginning with an Arbitrary Sequence (in Just Math)
Posted on 2008-01-31 (6 Comments)
Question re: Might be the solution by Charlie (2008-02-01 10:56:26)
Solution probabilistic solution by Charlie (2008-01-31 14:04:02)
Difficulty: 3 of 5Under The Car and the Train (in Science)
Posted on 2008-01-30 (3 Comments)
Solution solution by Charlie (2008-01-30 12:46:29)
Difficulty: 3 of 5Under Tennis Balls (in Games)
Posted on 2008-01-29 (4 Comments)
Hints/Tips re: Solution by Charlie (2008-01-30 15:53:30)
Difficulty: 3 of 5Under Circle And Intersection (in Geometry)
Posted on 2008-01-25 (6 Comments)
Solution assumption by Charlie (2008-01-25 15:38:54)
Difficulty: 3 of 5Under Colourful Knight's Tour (in Logic)
Posted on 2008-01-24 (20 Comments)
re: computer solution by Charlie (2008-01-24 15:48:27)
Solution computer solution by Charlie (2008-01-24 15:28:28)
Difficulty: 2 of 5Under Given Ratio, Find Sum (in Just Math)
Posted on 2008-01-21 (5 Comments)
Some Thoughts Playing around with Geometer's Sketchpad (spoiler) by Charlie (2008-01-21 11:53:58)
Difficulty: 3 of 5Under Unbounded Maze (in Algorithms)
Posted on 2008-01-18 (19 Comments)
re(3): Revision by Charlie (2008-01-27 11:00:04)
re: Revision by Charlie (2008-01-26 11:47:26)
re(6): No Subject - Constraint by Charlie (2008-01-23 11:47:41)
re(5): No Subject - Constraint by Charlie (2008-01-23 11:28:25)
re(5): No Subject - Constraint by Charlie (2008-01-23 10:52:46)
re(3): No Subject by Charlie (2008-01-21 01:49:47)
re(2): findings - like DNA by Charlie (2008-01-20 11:57:27)
Some Thoughts findings by Charlie (2008-01-18 18:39:07)
Difficulty: 3 of 5Under 52 Pickup (in Probability)
Posted on 2008-01-15 (5 Comments)
re: Computer Solution by Charlie (2008-01-16 12:35:41)
Difficulty: 3 of 5Under Red, White, Blue and Green (in Logic)
Posted on 2008-01-14 (12 Comments)
re(3): computer/human collaboration by Charlie (2008-01-17 11:03:31)
Solution re: computer/human collaboration by Charlie (2008-01-16 14:31:17)
Solution computer/human collaboration by Charlie (2008-01-14 18:59:19)
Difficulty: 3 of 5Under Two Circles And Maximum Triangle (in Geometry)
Posted on 2008-01-11 (6 Comments)
Solution solution by Charlie (2008-01-11 13:22:04)
Difficulty: 3 of 5Under Triangular Ring (in Numbers)
Posted on 2008-01-09 (9 Comments)
re: trying to do better by Charlie (2008-01-10 00:08:18)
Difficulty: 3 of 5Under Area of Pentagon (in Geometry)
Posted on 2008-01-07 (4 Comments)
Solution re: two ways (spoiler) by Charlie (2008-01-07 13:53:58)
Solution two ways (spoiler) by Charlie (2008-01-07 13:45:11)
Difficulty: 2 of 5Under Limit of the sequence? (in Just Math)
Posted on 2008-01-06 (10 Comments)
re: The solution was given by Charlie (2008-02-08 11:04:37)
Difficulty: 4 of 5Under Six Squared (in Logic)
Posted on 2008-01-03 (8 Comments)
Solution computer solution (spoiler) by Charlie (2008-01-03 17:47:41)
Difficulty: 3 of 5Under Divisible by 11 (in Algorithms)
Posted on 2008-01-02 (3 Comments)
Solution as a computer program by Charlie (2008-01-02 18:04:12)
Difficulty: 3 of 5Under Special Ordered Pairs (in Just Math)
Posted on 2007-12-28 (2 Comments)
Solution Heuristics for part 1 by Charlie (2007-12-28 18:12:47)
Difficulty: 3 of 5Under Bridge Probabilities (in Probability)
Posted on 2007-12-27 (2 Comments)
Solution re: solution -- correction on bonus questions by Charlie (2007-12-27 16:21:10)
Solution solution by Charlie (2007-12-27 16:04:48)
Difficulty: 2 of 5Under Getting Primed With Subtraction And Addition (in Just Math)
Posted on 2007-12-26 (5 Comments)
Some Thoughts computer exploration (spoiler) by Charlie (2007-12-26 11:59:39)
Difficulty: 3 of 5Under A Song for the Season 2 (in Cryptography)
Posted on 2007-12-25 (12 Comments)
Hints/Tips re(4): An observation -- hint -- picking nits by Charlie (2007-12-30 22:53:24)
re(4): An observation -- hint by Charlie (2007-12-29 11:40:49)
Difficulty: 3 of 5Under Circles around Circles (in Geometry)
Posted on 2007-12-23 (3 Comments)
Solution re: solution part 1 -- now parts 2 and 3 by Charlie (2007-12-27 21:01:17)
Solution solution part 1 by Charlie (2007-12-27 20:15:37)
Difficulty: 3 of 5Under Absolutely Geometric (in Geometry)
Posted on 2007-12-21 (6 Comments)
Some Thoughts approximate solution by Charlie (2007-12-21 12:41:11)
Difficulty: 4 of 5Under One Piece Tetris (in Shapes)
Posted on 2007-12-19 (5 Comments)
re: case 4 by Charlie (2007-12-20 16:39:50)
Solution Cases 1 - 3 by Charlie (2007-12-19 19:00:59)
Hints/Tips re: a way to play around with this -- pentominos by Charlie (2007-12-19 14:38:59)
Hints/Tips a way to play around with this by Charlie (2007-12-19 14:23:17)
Difficulty: 2 of 5Under Two Cube Folding Puzzles (in Shapes)
Posted on 2007-12-18 (6 Comments)
Solution solution by Charlie (2007-12-18 13:17:00)
Difficulty: 1 of 5Under Word Oddity (7) Anagrams (in Word Problems)
Posted on 2007-12-15 (4 Comments)
Some Thoughts From my anagram dictionary... by Charlie (2007-12-15 17:33:56)
Difficulty: 3 of 5Under Square And Intersection (in Geometry)
Posted on 2007-12-13 (3 Comments)
Solution two ways by Charlie (2007-12-13 13:05:36)
Difficulty: 4 of 5Under Locus of Points (in Geometry)
Posted on 2007-12-12 (17 Comments)
re: Solution by Charlie (2007-12-15 18:13:44)
Question re: Solution by Charlie (2007-12-14 12:52:55)
Question re: Solution by Charlie (2007-12-14 10:09:42)
re(3): Solution (spoiler) by Charlie (2007-12-14 00:47:20)
re: Solution (spoiler) by Charlie (2007-12-13 10:34:15)
and also by Charlie (2007-12-13 00:21:20)
re: three points again -- that second one got cut off by Charlie (2007-12-13 00:19:33)
three points again by Charlie (2007-12-13 00:18:04)
three regularly spaced points by Charlie (2007-12-12 22:06:32)
third point by Charlie (2007-12-12 22:04:34)
re: exploration with computer -- 2 non-opposing points by Charlie (2007-12-12 19:52:15)
Solution exploration with computer by Charlie (2007-12-12 19:48:10)
Difficulty: 1 of 5Under Word Oddity (6) Some have 6 (in Word Problems)
Posted on 2007-12-10 (6 Comments)
re: Uncommonly, some have seven (Solution) -- spelling? by Charlie (2007-12-10 15:33:08)
Difficulty: 3 of 5Under Cutting a Rectangle (in Shapes)
Posted on 2007-12-07 (9 Comments)
re(2): Solution missed some by Charlie (2007-12-07 15:59:47)
Solution computer solution by Charlie (2007-12-07 15:34:08)
Difficulty: 2 of 5Under Double Derangement Anagrams (in Word Problems)
Posted on 2007-12-05 (11 Comments)
re: Additional solutions by Charlie (2007-12-06 09:41:37)
Solution computer solutions by Charlie (2007-12-05 16:30:43)
Difficulty: 3 of 5Under Trapezing The Parabola (in Geometry)
Posted on 2007-12-01 (3 Comments)
Solution numerical solution via computer by Charlie (2007-12-02 13:51:13)
Difficulty: 3 of 5Under Sequence Fill In 2 (in Sequences)
Posted on 2007-11-30 (5 Comments)
re(2): Internet Explorer problems by Charlie (2007-12-02 12:33:16)
Solution computer solution (spoiler) by Charlie (2007-11-30 17:06:15)
Internet Explorer problems by Charlie (2007-11-30 10:56:30)
Difficulty: 3 of 5Under Final Scores at the PrimeBowl (in Games)
Posted on 2007-11-28 (10 Comments)
re(3): and just part 3 (and part 4). -- same scores, different ways, other alternates by Charlie (2007-11-29 14:19:52)
re(3): and just part 3 (and part 4). -- same scores, different ways, other alternates by Charlie (2007-11-28 22:21:10)
re: and just part 3 (and part 4). -- same scores, different ways, other alternates by Charlie (2007-11-28 15:57:49)
re: and just part 2. (agrees with my answer) -- also alternative formulation by Charlie (2007-11-28 15:52:14)
re: Just part 1. (beats my answer for part 1) by Charlie (2007-11-28 15:47:58)
Difficulty: 3 of 5Under Getting Natural With Pi (in Calculus)
Posted on 2007-11-27 (8 Comments)
re(3): There are two solutions by Charlie (2007-11-28 09:23:19)
re: There are two solutions by Charlie (2007-11-27 21:53:38)
Solution numerical solution -- spoiler by Charlie (2007-11-27 10:43:27)
Difficulty: 1 of 5Under Word Oddity (3) Back and forth (in Word Problems)
Posted on 2007-11-22 (4 Comments)
words of 12 or more letters by Charlie (2007-11-22 20:27:34)
Difficulty: 3 of 5Under Any triangle, Trigonometric function - second episode! (in Just Math)
Posted on 2007-11-18 (12 Comments)
re(2): Solution by Charlie (2007-11-21 09:10:11)
re: Solution by Charlie (2007-11-20 09:36:16)
computer exploration of all angles by Charlie (2007-11-18 23:16:28)
Difficulty: 3 of 5Under A Clockwork O'Range (in General)
Posted on 2007-11-16 (3 Comments)
Solution Is there more than one possibility? (spoiler) by Charlie (2007-11-16 10:41:44)
Difficulty: 3 of 5Under Angle from Exradii (in Geometry)
Posted on 2007-11-15 (3 Comments)
Some Thoughts estimate from Geometer's Sketchpad by Charlie (2007-11-15 11:39:47)
Difficulty: 3 of 5Under Quadrilateral With A Difference (in Geometry)
Posted on 2007-11-08 (3 Comments)
Solution answer (spoiler) but no proof by Charlie (2007-11-08 12:45:05)
Difficulty: 3 of 5Under Right Triangle And Midpoints (in Geometry)
Posted on 2007-10-31 (3 Comments)
Solution solution by Charlie (2007-10-31 10:41:27)
Difficulty: 2 of 5Under Seeking The Angle (in Geometry)
Posted on 2007-10-29 (4 Comments)
Solution Geometer's Sketchpad answer by Charlie (2007-10-29 11:47:30)
Difficulty: 3 of 5Under An Exponent Product And 98 Zeroes Puzzle (in Just Math)
Posted on 2007-10-27 (12 Comments)
Solution Basic programming language confirms by Charlie (2007-10-28 11:43:48)
Difficulty: 3 of 5Under EARTH, WATER, WIND AND FIRE (in Word Problems)
Posted on 2007-10-26 (7 Comments)
re: Well here's what I got, no program used by Charlie (2007-11-12 11:04:54)
Solution re: computer solution (spoilers) -- all the results by Charlie (2007-10-26 14:18:47)
Solution computer solution (spoilers) by Charlie (2007-10-26 14:13:38)
Difficulty: 3 of 5Under Disarray - Now, Rife At the Black Court (in Games)
Posted on 2007-10-25 (6 Comments)
re: Solution by Charlie (2007-10-25 11:38:17)
re: Computer program solution by Charlie (2007-10-25 11:30:51)
Solution Computer program solution by Charlie (2007-10-25 11:23:17)
Difficulty: 2 of 5Under Linear and quadratic (in Calculus)
Posted on 2007-10-23 (9 Comments)
Some Thoughts No Subject by Charlie (2007-10-23 14:54:06)
Difficulty: 4 of 5Under Seven Odd Primes (in Numbers)
Posted on 2007-10-20 (4 Comments)
Solution solution by Charlie (2007-10-20 19:40:58)
Difficulty: 3 of 5Under Disarray - Anarchy At the White Court (in Games)
Posted on 2007-10-19 (18 Comments)
Solution re(3): Solution -- another correction to my program by Charlie (2007-10-22 16:50:17)
re: Solution by Charlie (2007-10-22 09:29:00)
Solution re: Solution -- my program fixed by Charlie (2007-10-22 00:17:33)
Solution re: Solution by Charlie (2007-10-21 13:11:37)
re: Solution (other part) by Charlie (2007-10-19 17:40:17)
Solution I found (re: Solution) ... by Charlie (2007-10-19 17:31:02)
Difficulty: 3 of 5Under Arrange with 3-4-5 difference (in Just Math)
Posted on 2007-10-16 (7 Comments)
re: hint (spoiler) by Charlie (2007-10-16 16:03:43)
Difficulty: 2 of 5Under Sum To 2007 Nines? (in Numbers)
Posted on 2007-10-15 (11 Comments)
re(4): solution by Charlie (2007-10-20 14:06:18)
re(2): solution by Charlie (2007-10-16 16:53:08)
Solution re: solution by Charlie (2007-10-16 09:35:30)
Hints/Tips hint by Charlie (2007-10-15 14:45:05)
Difficulty: 3 of 5Under Special Natural Numbers (in Numbers)
Posted on 2007-10-14 (8 Comments)
re(3): Some were discovered.... by Charlie (2007-10-15 14:21:25)
re(2): Some were discovered.... by Charlie (2007-10-15 14:19:53)
Difficulty: 3 of 5Under Acute triangle, Trigonometric function! (in Just Math)
Posted on 2007-10-13 (9 Comments)
re: proof (maybe) by Charlie (2007-10-14 10:39:37)
Question re: Solution by Charlie (2007-10-14 10:37:43)
Some Thoughts re: not a proof but ... by Charlie (2007-10-13 16:47:30)
Some Thoughts not a proof but ... by Charlie (2007-10-13 16:39:03)
Difficulty: 2 of 5Under Empowered Integral (in Calculus)
Posted on 2007-10-12 (5 Comments)
re(2): No Subject by Charlie (2007-10-12 11:11:07)
re: No Subject by Charlie (2007-10-12 11:09:45)
Solution solution by Charlie (2007-10-12 11:06:04)
Difficulty: 3 of 5Under Getting Cubic With T^2 (in Numbers)
Posted on 2007-10-10 (4 Comments)
Solution computer analysis/solution by Charlie (2007-10-10 10:44:56)
Difficulty: 4 of 5Under Know thy Knaves (in Liars and Knights)
Posted on 2007-10-09 (8 Comments)
re: No Subject by Charlie (2007-10-11 15:42:55)
Solution computer solution (spoiler) by Charlie (2007-10-09 11:44:14)
Difficulty: 3 of 5Under Seeking Sums With Inradius And Exradius (in Geometry)
Posted on 2007-10-08 (4 Comments)
Solution Answer -- almost a proof by Charlie (2007-10-08 11:25:46)
Difficulty: 3 of 5Under Repunits And 2008 (in Just Math)
Posted on 2007-10-06 (2 Comments)
re: Repunits by Charlie (2007-10-07 02:35:47)
Difficulty: 3 of 5Under Convex Quadrilateral And Intersection (in Geometry)
Posted on 2007-10-03 (8 Comments)
re: What am I doing wrong? by Charlie (2007-10-05 11:17:55)
re: solution by Charlie (2007-10-03 12:10:28)
Solution solution by Charlie (2007-10-03 11:22:50)
Difficulty: 3 of 5Under De Ja True? (in Liars and Knights)
Posted on 2007-09-29 (6 Comments)
Solution computer program used by Charlie (2007-09-29 16:19:40)
Difficulty: 3 of 5Under Acutely Seeking Perimeter (in Geometry)
Posted on 2007-09-28 (2 Comments)
Solution Solution by Charlie (2007-09-28 11:05:16)
Difficulty: 3 of 5Under Rationalizing Decimals (in Numbers)
Posted on 2007-09-26 (8 Comments)
re: How about the numerator? by Charlie (2007-09-26 12:11:15)
Solution solution by Charlie (2007-09-26 10:37:45)
Difficulty: 3 of 5Under All Nine? (in Word Problems)
Posted on 2007-09-24 (16 Comments)
re(2): posting & Firefox by Charlie (2007-10-03 12:05:53)
re(3): SOLUTION by Charlie (2007-09-25 11:20:25)
re(2): posting by Charlie (2007-09-24 23:59:37)
posting by Charlie (2007-09-24 16:09:35)
Difficulty: 2 of 5Under Tangent And Geometric Sequence (in Geometry)
Posted on 2007-09-21 (2 Comments)
Question I'm confused by Charlie (2007-09-21 17:11:19)
Difficulty: 3 of 5Under Doubleton (in Liars and Knights)
Posted on 2007-09-20 (9 Comments)
Solution solution by Charlie (2007-09-20 10:27:06)
Difficulty: 3 of 5Under Getting the Numbers With Product And Quotient (in Just Math)
Posted on 2007-09-17 (7 Comments)
Solution non-analytic (spoiler) by Charlie (2007-09-17 11:53:36)
Difficulty: 3 of 5Under Power 2 The Cards (in Just Math)
Posted on 2007-09-16 (2 Comments)
Solution re: solution by Charlie (2007-09-21 10:35:13)
Solution solution by Charlie (2007-09-16 16:55:08)
Difficulty: 3 of 5Under Align Any Set (in Numbers)
Posted on 2007-09-15 (5 Comments)
re: Answer by Charlie (2007-09-16 11:43:34)
Difficulty: 3 of 5Under Letter Shifted Palindromes (in Word Problems)
Posted on 2007-09-08 (5 Comments)
Solution From my word list -- computer solution by Charlie (2007-09-08 15:13:56)
Difficulty: 2 of 5Under Keycode (in Logic)
Posted on 2007-09-06 (14 Comments)
re(2): Solution -- mis read? by Charlie (2007-09-07 08:50:56)
Solution re: Solution found by Charlie (2007-09-06 12:01:23)
Difficulty: 4 of 5Under Travelling Knight (in Logic)
Posted on 2007-09-02 (12 Comments)
Solution computer solution by Charlie (2007-09-03 01:14:18)
Difficulty: 4 of 5Under TGIF (in Logic)
Posted on 2007-08-31 (6 Comments)
re: solution by Charlie (2007-09-02 11:29:51)
re: Solution by Charlie (2007-08-31 22:43:01)
Difficulty: 3 of 5Under On a Grid 2 (in Logic)
Posted on 2007-08-29 (11 Comments)
Some Thoughts Some comments by Charlie (2007-11-02 12:54:33)
re: Solution -- next size w/ half X'ed by Charlie (2007-11-01 14:20:25)
Difficulty: 3 of 5Under The Last Three Digits (in Numbers)
Posted on 2007-08-28 (9 Comments)
Solution re: No, a fuller List [part spoiler?] by Charlie (2007-08-28 22:29:38)
Solution yes, full list by Charlie (2007-08-28 15:12:04)
Difficulty: 3 of 5Under WXYZ (in Logic)
Posted on 2007-08-27 (5 Comments)
Solution computer solution by Charlie (2007-08-27 12:21:52)
Difficulty: 4 of 5Under Tough Puzzle (part 3) (in Numbers)
Posted on 2007-08-23 (4 Comments)
Solution computer solution by Charlie (2007-08-23 11:16:52)
Difficulty: 4 of 5Under Slice a Circle to fit a Rectangle (in Shapes)
Posted on 2007-08-22 (10 Comments)
Solution re(2): computer exploration of part 3 by Charlie (2007-08-23 16:21:41)
re: computer exploration of part 3 by Charlie (2007-08-23 15:25:45)
Some Thoughts computer exploration of part 3 by Charlie (2007-08-23 10:55:42)
Solution part 2 by Charlie (2007-08-22 14:52:28)
Solution part one by Charlie (2007-08-22 12:08:34)
Difficulty: 4 of 5Under Missing Numbers Please (in Sequences)
Posted on 2007-08-21 (7 Comments)
re: No Subject by Charlie (2007-08-22 16:53:19)
Hints/Tips BTW by Charlie (2007-08-22 09:23:36)
Difficulty: 2 of 5Under Find the Ratio (in Geometry)
Posted on 2007-08-20 (3 Comments)
Solution solution by Charlie (2007-08-20 11:48:05)
Difficulty: 2 of 5Under Getting Primes With 2 And 4 (in Numbers)
Posted on 2007-08-19 (6 Comments)
Some Thoughts computer exploration -- no proof -- spoiler by Charlie (2007-08-19 14:44:29)
Difficulty: 2 of 5Under Starbucks! (in Just Math)
Posted on 2007-08-18 (12 Comments)
re(2): solution - Write to Starbucks. by Charlie (2007-08-19 13:51:03)
Difficulty: 4 of 5Under Getting Maps In 2080 (in Just Math)
Posted on 2007-08-17 (4 Comments)
Solution one case missing--computer lists all combinations by Charlie (2007-08-20 10:36:24)
re(2): solution by Charlie (2007-08-18 01:14:24)
Solution solution by Charlie (2007-08-17 15:34:40)
Difficulty: 4 of 5Under Tough Puzzle (part 2) (in Logic)
Posted on 2007-08-16 (17 Comments)
re(2): Question by Charlie (2007-08-17 17:05:15)
re: italics and lack thereof by Charlie (2007-08-17 00:53:01)
italics and lack thereof by Charlie (2007-08-17 00:52:05)
Solution computer assisted solution by Charlie (2007-08-16 11:18:05)
Difficulty: 3 of 5Under Sum Numbers, Get Even (Digits)? (in Just Math)
Posted on 2007-08-15 (5 Comments)
Solution full solution by Charlie (2007-08-16 01:05:05)
re(2): solution by Charlie (2007-08-15 11:55:08)
re: solution by Charlie (2007-08-15 11:34:00)
Difficulty: 3 of 5Under Can't see the wood for the trees (in Numbers)
Posted on 2007-08-14 (7 Comments)
re: Solution by Charlie (2007-08-14 16:45:17)
Difficulty: 3 of 5Under A Cube Root And Multiple Puzzle (in Numbers)
Posted on 2007-08-10 (6 Comments)
re: Solution by Charlie (2007-08-10 12:21:23)
Difficulty: 3 of 5Under Tough Puzzle (part 1) (in Numbers)
Posted on 2007-08-09 (4 Comments)
Solution computer solution by Charlie (2007-08-09 10:32:20)
Difficulty: 3 of 5Under On a Grid (in Logic)
Posted on 2007-08-08 (7 Comments)
re: What happens with a 6x6? by Charlie (2007-08-09 10:34:08)
re: On a 12 x 12 by Charlie (2007-08-08 15:34:59)
On a 12 x 12 by Charlie (2007-08-08 11:59:50)
Solution re: solution of first part by Charlie (2007-08-08 11:48:06)
Difficulty: 3 of 5Under Getting Fruity With 73 And 2005 (in Numbers)
Posted on 2007-08-06 (1 Comments)
Solution computer aided by Charlie (2007-08-06 10:55:43)
Difficulty: 4 of 5Under Add To Cube, Get Square? (in Numbers)
Posted on 2007-08-03 (10 Comments)
Some Thoughts re: thoughts by Charlie (2007-08-03 10:07:33)
Some Thoughts thoughts by Charlie (2007-08-03 09:37:38)
Difficulty: 3 of 5Under Shade-doku (in Logic)
Posted on 2007-08-02 (13 Comments)
Solution disregarding the starter squares by Charlie (2007-08-02 11:15:49)
Difficulty: 2 of 5Under Take The Midpoints, Get Equilateral? (in Geometry)
Posted on 2007-08-01 (4 Comments)
Some Thoughts answer--but not solution by Charlie (2007-08-01 21:47:29)
Difficulty: 3 of 5Under 4,4,4,4.... (in Sequences)
Posted on 2007-07-31 (8 Comments)
re(2): 63424563562324 by Charlie (2007-08-09 10:45:19)
63424563562324 by Charlie (2007-08-07 12:17:12)
Difficulty: 3 of 5Under Drop Down (in General)
Posted on 2007-07-29 (6 Comments)
Solution solution by Charlie (2007-07-29 13:12:50)
Difficulty: 2 of 5Under A simple logical question (in Just Math)
Posted on 2007-07-27 (4 Comments)
re(2): computer exploration--lacking proof--spoilers by Charlie (2007-07-31 10:35:25)
Solution computer exploration--lacking proof--spoilers by Charlie (2007-07-27 12:13:58)
Difficulty: 4 of 5Under Numbered Cards (in Probability)
Posted on 2007-07-23 (13 Comments)
statistics on the 126 by Charlie (2007-07-24 13:42:56)
re(3): Jer: -- the rest of the table by Charlie (2007-07-24 12:56:02)
re(2): Jer: by Charlie (2007-07-24 12:53:38)
re: Jer: by Charlie (2007-07-24 10:44:24)
re(3): computer-assisted solution by Charlie (2007-07-24 10:27:27)
re: computer-assisted solution by Charlie (2007-07-24 00:06:53)
Solution computer-assisted solution by Charlie (2007-07-23 23:46:20)
Difficulty: 2 of 5Under Sum of all solutions (in Just Math)
Posted on 2007-07-20 (8 Comments)
Some Thoughts One pattern by Charlie (2007-07-20 23:16:21)
Some Thoughts see a pattern here? by Charlie (2007-07-20 22:57:47)
Difficulty: 3 of 5Under Facetious? - No! (in Word Problems)
Posted on 2007-07-17 (6 Comments)
Solution more than what's asked by Charlie (2007-07-17 16:32:33)
Difficulty: 3 of 5Under Miracles? - Nah - Mirickles! (in Word Problems)
Posted on 2007-07-14 (9 Comments)
Solution from computer list by Charlie (2007-07-14 13:35:30)
Difficulty: 3 of 5Under Take Divisors, Get Square Root (in Numbers)
Posted on 2007-07-13 (5 Comments)
Some Thoughts computer exploration--spoiler by Charlie (2007-07-13 11:14:19)
Difficulty: 3 of 5Under Connect the Unconnected (in Word Problems)
Posted on 2007-07-11 (8 Comments)
Solution 11 pairs from 20 words by Charlie (2007-07-11 11:15:57)
Difficulty: 2 of 5Under A Reciprocal And Square Problem (in Just Math)
Posted on 2007-07-10 (7 Comments)
Solution computer aided solution by Charlie (2007-07-10 11:16:04)
re: Solution by Charlie (2007-07-10 11:08:38)
Difficulty: 3 of 5Under A Game of Tennis (in Probability)
Posted on 2007-07-05 (6 Comments)
re(3): First question - disagree by Charlie (2007-07-06 01:11:52)
Difficulty: 3 of 5Under Sum Three Factorials, Get Exponent (in Numbers)
Posted on 2007-07-03 (8 Comments)
re(2): computer findings by Charlie (2007-07-03 11:57:36)
Some Thoughts computer findings by Charlie (2007-07-03 10:31:57)
Difficulty: 3 of 5Under A grok is a grok is a ... ? (in Liars and Knights)
Posted on 2007-06-29 (11 Comments)
re: Possible solution. by Charlie (2007-06-30 19:31:35)
Solution No Subject by Charlie (2007-06-29 10:22:36)
Difficulty: 2 of 5Under Quote Unquote (in General)
Posted on 2007-06-26 (8 Comments)
Solution most parts by Charlie (2007-06-26 10:00:41)
Difficulty: 3 of 5Under Balanced Stellar (in Just Math)
Posted on 2007-06-22 (8 Comments)
1/2 separately by Charlie (2007-06-22 12:30:30)
2 1/2 out of 3. by Charlie (2007-06-22 10:09:27)
Difficulty: 4 of 5Under Multiply Together, Get Cubic (in Numbers)
Posted on 2007-06-21 (8 Comments)
re: if s = 1 (one more solution!) by Charlie (2007-06-22 09:32:49)
extended search by Charlie (2007-06-21 11:05:34)
early results -- no proof by Charlie (2007-06-21 09:49:24)
Difficulty: 4 of 5Under The Pace of the Race (in Probability)
Posted on 2007-06-19 (4 Comments)
re: monte carlo --part III by Charlie (2007-06-19 12:20:07)
monte carlo --parts I and II by Charlie (2007-06-19 12:03:28)
Difficulty: 3 of 5Under fragmented whole (in Word Problems)
Posted on 2007-06-14 (9 Comments)
having done some internet research (spoiler) by Charlie (2007-06-14 14:44:06)
re: Some key words by Charlie (2007-06-14 14:28:33)
Difficulty: 3 of 5Under From Minus One to Plus One (in Numbers)
Posted on 2007-06-13 (7 Comments)
Solution computer solution by Charlie (2007-06-13 16:13:57)
Difficulty: 2 of 5Under A Square Pin Bundle (in Numbers)
Posted on 2007-06-09 (3 Comments)
Solution computer solutions by Charlie (2007-06-09 15:53:46)
Difficulty: 3 of 5Under Blue Moon (in Probability)
Posted on 2007-06-07 (2 Comments)
Solution solution by Charlie (2007-06-07 16:56:31)
Difficulty: 2 of 5Under Fear this problem! (in Cryptography)
Posted on 2007-06-07 (2 Comments)
Solution solution by Charlie (2007-06-07 10:45:59)
Difficulty: 3 of 5Under Square in a Sector (in Geometry)
Posted on 2007-06-06 (5 Comments)
re: No formula but: by Charlie (2007-06-07 10:15:38)
Some Thoughts No formula but: by Charlie (2007-06-06 16:55:57)
Difficulty: 3 of 5Under SuDoKu Prime (in Numbers)
Posted on 2007-06-03 (3 Comments)
Some Thoughts Hmmmm.... by Charlie (2007-06-04 15:40:31)
Difficulty: 4 of 5Under Dodecahedral Vertex Sums (in Just Math)
Posted on 2007-06-01 (5 Comments)
Solution computer solution by Charlie (2007-06-01 17:51:00)
Some Thoughts first part by Charlie (2007-06-01 14:56:11)
Difficulty: 2 of 5Under Counting the Types (in Liars and Knights)
Posted on 2007-05-31 (4 Comments)
Solution solution by Charlie (2007-05-31 11:52:52)
Difficulty: 3 of 5Under Take non decreasing, get non negative (in Numbers)
Posted on 2007-05-29 (5 Comments)
Solution solution by Charlie (2007-05-29 16:49:02)
Difficulty: 3 of 5Under Bugs and Cubs (in Cryptography)
Posted on 2007-05-29 (13 Comments)
re(2): solution (computer aided) by Charlie (2007-05-29 14:43:49)
Solution re: solution (computer aided) by Charlie (2007-05-29 12:38:55)
Difficulty: 3 of 5Under Go 2 Gig, Get Minimum (in Numbers)
Posted on 2007-05-25 (3 Comments)
Solution Quick Basic solution (pun) -- (spoiler!!!) by Charlie (2007-05-25 16:32:14)
Difficulty: 2 of 5Under How to pick 'em (in Logic)
Posted on 2007-05-25 (8 Comments)
re(2): Solution by Charlie (2007-05-25 16:59:51)
If duplicates are not allowed by Charlie (2007-05-25 10:43:00)
If duplicates are allowed, this works by Charlie (2007-05-25 10:35:34)
Difficulty: 3 of 5Under Mean, Median, and Mode (in General)
Posted on 2007-05-24 (5 Comments)
re(2): solution by Charlie (2007-05-24 14:55:02)
Solution solution by Charlie (2007-05-24 10:35:23)
Difficulty: 4 of 5Under Queue weight possibilities 2. (in Numbers)
Posted on 2007-05-23 (3 Comments)
re(2): solution -- recurrences by Charlie (2007-05-23 16:00:10)
re: solution -- recurrences by Charlie (2007-05-23 15:46:24)
Solution solution by Charlie (2007-05-23 15:40:13)
Difficulty: 2 of 5Under Mean Sequence (in Sequences)
Posted on 2007-05-23 (7 Comments)
re: spoiler by Charlie (2007-05-23 10:09:46)
no proof but... by Charlie (2007-05-23 10:03:33)
Difficulty: 4 of 5Under Pushing Numbers 2 (in Logic)
Posted on 2007-05-22 (6 Comments)
re: No Subject by Charlie (2007-05-27 22:04:59)
Difficulty: 3 of 5Under Soccer Stats (in Logic)
Posted on 2007-05-22 (9 Comments)
re: source of the problem by Charlie (2007-05-23 11:53:43)
Hints/Tips Hint by Charlie (2007-05-23 10:25:37)
re: soccer stats by Charlie (2007-05-22 14:38:06)
Difficulty: 4 of 5Under The Irrational Units Digit (in Numbers)
Posted on 2007-05-21 (4 Comments)
Some Thoughts well, it looks like by Charlie (2007-05-21 14:56:05)
Difficulty: 3 of 5Under Falling through the floor (in Probability)
Posted on 2007-05-18 (4 Comments)
re(2): solutions for first three by Charlie (2007-05-18 14:56:25)
Solution part 4 by Charlie (2007-05-18 11:56:35)
solutions for first three by Charlie (2007-05-18 11:26:33)
Difficulty: 3 of 5Under Who Said What? (in Liars and Knights)
Posted on 2007-05-17 (8 Comments)
Solution re: solution -- the computer way by Charlie (2007-05-17 15:39:39)
Solution solution by Charlie (2007-05-17 15:36:02)
Difficulty: 1 of 5Under A turtles' problem (in Tricks)
Posted on 2007-05-17 (16 Comments)
re: solution by Charlie (2007-05-17 12:11:23)
Difficulty: 4 of 5Under Well Balanced Letter: F (in Shapes)
Posted on 2007-05-16 (8 Comments)
Question re: maybe -- numerical confirmation and question by Charlie (2007-05-17 10:16:17)
Difficulty: 3 of 5Under Four statements (in Logic)
Posted on 2007-05-16 (8 Comments)
re(2): Boolean by Charlie (2007-05-17 12:18:34)
re: 1 & 4 are true by Charlie (2007-05-17 09:33:32)
Solution Boolean by Charlie (2007-05-16 18:59:10)
Difficulty: 3 of 5Under Queue weight possibilities. (in Numbers)
Posted on 2007-05-15 (3 Comments)
Solution solution by Charlie (2007-05-15 16:54:39)
Difficulty: 3 of 5Under Get The Distance (in General)
Posted on 2007-05-15 (2 Comments)
Solution solution by Charlie (2007-05-15 15:56:02)
Difficulty: 3 of 5Under Consecutive Integer Series (in Numbers)
Posted on 2007-05-14 (12 Comments)
re: NAME IT by Charlie (2007-05-15 01:30:18)
re(2): A formula by Charlie (2007-05-15 01:23:01)
Difficulty: 3 of 5Under Magic trick (in General)
Posted on 2007-05-11 (51 Comments)
re: A new approach by Charlie (2007-05-14 23:53:55)
re: Some statistics -- continued by Charlie (2007-05-14 23:44:58)
Some Thoughts Some statistics by Charlie (2007-05-14 23:43:25)
Question re: A Little Hocus Pocus by Charlie (2007-05-13 12:07:23)
re(3): please read by Charlie (2007-05-13 11:40:52)
re(2): please read by Charlie (2007-05-13 11:17:20)
re(5): please read by Charlie (2007-05-13 03:35:22)
re(3): please read by Charlie (2007-05-13 03:09:48)
please read by Charlie (2007-05-12 10:20:26)
re(2): limitations by Charlie (2007-05-11 15:47:14)
re: limitations by Charlie (2007-05-11 13:44:50)
Some Thoughts limitations by Charlie (2007-05-11 13:39:41)
Difficulty: 2 of 5Under Well Balanced Letter: C (in Shapes)
Posted on 2007-05-10 (2 Comments)
Solution Iterative computer solution--is there an analytic one? by Charlie (2007-05-10 19:28:32)
Difficulty: 3 of 5Under Substitute seen, get result (in Numbers)
Posted on 2007-05-10 (4 Comments)
Solution method of exhaustion by Charlie (2007-05-10 11:33:53)
Difficulty: 4 of 5Under Minimum perpendicular (in Calculus)
Posted on 2007-05-09 (4 Comments)
re(3): minimum? by Charlie (2007-05-10 12:29:17)
Difficulty: 2 of 5Under Deleted Numbers (in Numbers)
Posted on 2007-05-09 (4 Comments)
re: Solution by Charlie (2007-05-09 15:26:34)
Solution solution by Charlie (2007-05-09 11:06:47)
Difficulty: 3 of 5Under Rank The Magicians (in Logic)
Posted on 2007-05-08 (8 Comments)
Solution of course there's a computer solution also by Charlie (2007-05-08 21:30:26)
Solution solution by Charlie (2007-05-08 11:48:05)
Difficulty: 2 of 5Under Simple Sequence (in Sequences)
Posted on 2007-05-07 (7 Comments)
re: Please explain by Charlie (2007-05-08 12:38:19)
Difficulty: 3 of 5Under Add Square Roots, Get Real(m) (in Just Math)
Posted on 2007-05-06 (3 Comments)
re: An answer by Charlie (2007-05-06 21:41:23)
Difficulty: 4 of 5Under Sum Squared Divisors, Get Number (in Numbers)
Posted on 2007-05-03 (6 Comments)
re: Sum thoughts by Charlie (2007-05-03 16:04:11)
Difficulty: 4 of 5Under X Marks the Spot (in Logic)
Posted on 2007-05-02 (14 Comments)
Solution Computer Solution by Charlie (2007-05-03 09:46:01)
Question X and Y? by Charlie (2007-05-03 00:18:23)
Difficulty: 2 of 5Under Well Balanced Letter: E (in Shapes)
Posted on 2007-04-30 (5 Comments)
Solution If ... by Charlie (2007-04-30 10:50:56)
Difficulty: 4 of 5Under Belonging (in Numbers)
Posted on 2007-04-29 (7 Comments)
re: One Solution (spoiler?) by Charlie (2007-04-29 16:41:06)
Difficulty: 3 of 5Under Note the function, get the value(s) (in Numbers)
Posted on 2007-04-28 (2 Comments)
Solution solution by Charlie (2007-04-28 10:10:39)
Difficulty: 3 of 5Under Two Semicircles (in Shapes)
Posted on 2007-04-27 (5 Comments)
Solution You could... by Charlie (2007-04-27 14:33:07)
Difficulty: 3 of 5Under Doctor, nurse and apprentice. (in Liars and Knights)
Posted on 2007-04-26 (9 Comments)
re: Solutions by Charlie (2007-04-26 16:42:31)
Difficulty: 2 of 5Under Matrix Identity (in Just Math)
Posted on 2007-04-26 (8 Comments)
Solution re: Solution by Charlie (2007-04-26 09:49:05)
Difficulty: 3 of 5Under Present in 6 (in Word Problems)
Posted on 2007-04-25 (14 Comments)
Solution Abbreviated notation shortens list by Charlie (2007-04-26 10:53:22)
re(2): so many ways by Charlie (2007-04-26 09:53:32)
Solution re: so many ways by Charlie (2007-04-25 17:06:56)
Solution so many ways by Charlie (2007-04-25 17:02:52)
Difficulty: 3 of 5Under Multiply together, get Euler? (in Calculus)
Posted on 2007-04-24 (1 Comments)
Solution computer test by Charlie (2007-04-24 09:52:40)
Difficulty: 3 of 5Under Lotto Losers (in Numbers)
Posted on 2007-04-23 (9 Comments)
Solution solution by Charlie (2007-04-23 14:58:14)
Difficulty: 3 of 5Under A Near Diophantine Octagon Problem (in Geometry)
Posted on 2007-04-22 (10 Comments)
Solution non-analytical "solution" by Charlie (2007-04-22 15:40:57)
Difficulty: 3 of 5Under Triangular Triples (in Numbers)
Posted on 2007-04-21 (7 Comments)
re: only one solution? by Charlie (2007-04-23 10:19:00)
Difficulty: 3 of 5Under Square Patterns (in Shapes)
Posted on 2007-04-20 (4 Comments)
Solution 50 unique solutions by Charlie (2007-04-20 22:30:52)
Difficulty: 2 of 5Under Basic Statistics 2 (in Numbers)
Posted on 2007-04-20 (8 Comments)
re: Solution by Charlie (2007-04-20 11:20:40)
Solution solution by Charlie (2007-04-20 11:16:22)
Difficulty: 3 of 5Under The blurred note 2 (in Liars and Knights)
Posted on 2007-04-19 (6 Comments)
Solution solution by Charlie (2007-04-19 15:27:45)
Difficulty: 2 of 5Under Emir P. Prime (in Numbers)
Posted on 2007-04-19 (5 Comments)
re: Analytic Solution by Charlie (2007-04-19 14:45:34)
Solution computer solution by Charlie (2007-04-19 12:05:26)
Difficulty: 3 of 5Under Five Squares (in Numbers)
Posted on 2007-04-18 (7 Comments)
Solution if c can equal d by Charlie (2007-04-18 11:40:18)
Solution computer solution by Charlie (2007-04-18 11:32:07)
Difficulty: 3 of 5Under Paint it black II (in Probability)
Posted on 2007-04-17 (3 Comments)
Solution bonus solution by Charlie (2007-04-18 09:35:40)
Solution solution to main puzzle by Charlie (2007-04-17 15:58:29)
Difficulty: 3 of 5Under The Incredible Shrinking Word (in Word Problems)
Posted on 2007-04-16 (5 Comments)
more by Charlie (2007-04-16 15:40:04)
Difficulty: 3 of 5Under Cribbed Idea (in Numbers)
Posted on 2007-04-15 (4 Comments)
Correction to Puzzle !!! by Charlie (2007-04-16 09:09:39)
Difficulty: 3 of 5Under Always greater (in Games)
Posted on 2007-04-14 (6 Comments)
Solution solution by Charlie (2007-04-14 15:12:01)
Difficulty: 2 of 5Under Another Maze (in Tricks)
Posted on 2007-04-13 (14 Comments)
Some Thoughts thoughts by Charlie (2007-04-13 09:57:12)
Difficulty: 4 of 5Under A Point in a Triangle (in Geometry)
Posted on 2007-04-12 (8 Comments)
re(4): on another look by Charlie (2007-04-13 16:46:25)
Solution solution (spoiler) by Charlie (2007-04-12 15:40:14)
Difficulty: 2 of 5Under Fast clock, slow clock (in Riddles)
Posted on 2007-04-11 (16 Comments)
Solution re: Responses and hints by Charlie (2007-04-12 15:25:41)
Difficulty: 4 of 5Under Is it, or is it not? (in Numbers)
Posted on 2007-04-10 (13 Comments)
Solution re: solution --- easier nowadays by Charlie (2020-11-23 07:15:36)
re: Had fun by Charlie (2007-04-12 16:20:58)
re: Just a simple pattern by Charlie (2007-04-11 09:18:17)
Solution solution by Charlie (2007-04-10 16:58:44)
re: Just a simple pattern by Charlie (2007-04-10 16:42:22)
Difficulty: 3 of 5Under The blurred note (in Liars and Knights)
Posted on 2007-04-10 (8 Comments)
Solution solution by Charlie (2007-04-10 10:52:36)
Difficulty: 4 of 5Under Sins of the Gambler 2 (in Probability)
Posted on 2007-04-05 (4 Comments)
re: Solution by Charlie (2007-04-05 15:08:24)
Difficulty: 2 of 5Under Sum the integers, get squares? (in Just Math)
Posted on 2007-04-05 (5 Comments)
Solution solution by Charlie (2007-04-05 10:25:45)
Difficulty: 4 of 5Under Just One (in Word Problems)
Posted on 2007-04-04 (8 Comments)
Solution no repeated letters -- several computer-found solutions by Charlie (2007-04-06 00:11:57)
Difficulty: 3 of 5Under Weddings (in Liars and Knights)
Posted on 2007-04-03 (9 Comments)
re: charlies solution by Charlie (2007-04-03 11:57:29)
Solution solution by Charlie (2007-04-03 11:36:17)
Difficulty: 3 of 5Under Paint it black (in Probability)
Posted on 2007-04-02 (9 Comments)
re(2): solution by Charlie (2007-04-04 16:13:44)
re: Too big numbers by Charlie (2007-04-02 22:12:46)
Solution solution by Charlie (2007-04-02 12:11:14)
Difficulty: 3 of 5Under Perplexus Cryptarithm Puzzle (in Numbers)
Posted on 2007-03-31 (4 Comments)
re: answer by Charlie (2007-04-01 20:59:21)
Solution computer solution by Charlie (2007-03-31 16:25:48)
Difficulty: 3 of 5Under Alternating sextet (in Sequences)
Posted on 2007-03-30 (7 Comments)
Solution brute force (spoiler) by Charlie (2007-03-30 14:44:01)
Difficulty: 4 of 5Under Incongruency (in Geometry)
Posted on 2007-03-23 (4 Comments)
Solution proof by Charlie (2007-03-23 15:06:34)
Solution using geometer's sketchpad by Charlie (2007-03-23 14:43:59)
Difficulty: 3 of 5Under On the clock (in Just Math)
Posted on 2007-03-23 (7 Comments)
re(2): ... and at what times by Charlie (2007-04-01 21:16:05)
Solution ... and at what times by Charlie (2007-03-23 09:07:51)
Difficulty: 3 of 5Under At Fault Coverage (in Shapes)
Posted on 2007-03-22 (9 Comments)
program for the list by Charlie (2007-03-23 11:32:10)
...through the most grievous faults by Charlie (2007-03-23 11:29:02)
re: all the faults by Charlie (2007-03-23 11:27:21)
all the faults by Charlie (2007-03-23 11:25:31)
re: brute force by Charlie (2007-03-22 22:07:09)
Solution brute force by Charlie (2007-03-22 21:57:05)
Difficulty: 3 of 5Under Appropriate Area (in Numbers)
Posted on 2007-03-21 (5 Comments)
Solution computer list by Charlie (2007-03-21 15:57:32)
Difficulty: 2 of 5Under Subtract Half, Get GI? (in Calculus)
Posted on 2007-03-20 (2 Comments)
Hints/Tips background by Charlie (2007-03-20 15:47:49)
Difficulty: 2 of 5Under Powersdale To Quicksville (in General)
Posted on 2007-03-20 (6 Comments)
Solution solution by Charlie (2007-03-20 09:51:39)
Difficulty: 3 of 5Under A 2011 Problem (in Numbers)
Posted on 2007-03-17 (3 Comments)
Solution solution by Charlie (2007-03-17 14:37:35)
Difficulty: 3 of 5Under Polynomial Puzzle (in Just Math)
Posted on 2007-03-16 (7 Comments)
Solution solution by Charlie (2007-03-16 13:59:30)
Difficulty: 3 of 5Under What Is The Number? (in Logic)
Posted on 2007-03-16 (13 Comments)
re: the answer is 9 by Charlie (2007-03-17 14:23:53)
Solution the table by Charlie (2007-03-16 08:31:26)
Difficulty: 3 of 5Under Apples (in General)
Posted on 2007-03-15 (10 Comments)
re: Solution by Charlie (2007-03-15 11:18:47)
Solution re: solution by Charlie (2007-03-15 08:31:08)
Some Thoughts solution by Charlie (2007-03-15 08:25:17)
Difficulty: 3 of 5Under Square Pisano, Get Sequence? (in Sequences)
Posted on 2007-03-14 (4 Comments)
Solution solution by Charlie (2007-03-14 14:15:31)
Difficulty: 3 of 5Under Two Logicians Lockout (in Logic)
Posted on 2007-03-13 (10 Comments)
Solution re: ...Huh? by Charlie (2007-03-18 15:00:07)
Solution real computer solution -- disregard previous by Charlie (2007-03-14 09:40:21)
Some Thoughts re: computer solution -- more by Charlie (2007-03-14 09:13:38)
Some Thoughts computer solution by Charlie (2007-03-14 09:04:00)
Difficulty: 2 of 5Under Integer coefficients (in Just Math)
Posted on 2007-03-13 (3 Comments)
Solution cheating (WIMS Factoris) by Charlie (2007-03-13 08:31:49)
Difficulty: 4 of 5Under placing numbers (in Logic)
Posted on 2007-03-12 (13 Comments)
Solution re(2): The integers -- almost magic by Charlie (2007-03-28 08:41:19)
re(2): The integers by Charlie (2007-03-16 09:53:18)
Solution re: The integers by Charlie (2007-03-16 09:47:29)
Hints/Tips re: The integers by Charlie (2007-03-15 12:00:16)
re: Close, but not quite it. by Charlie (2007-03-15 08:49:45)
Difficulty: 4 of 5Under logic and cones (in Logic)
Posted on 2007-03-09 (3 Comments)
Solution 2 ways by Charlie (2007-03-09 17:16:16)
Difficulty: 3 of 5Under Four Coins and Three Weighings (in Weights and Scales)
Posted on 2007-03-08 (10 Comments)
re: Information theory way by Charlie (2007-03-09 09:50:07)
Solution proof by Charlie (2007-03-08 15:46:14)
Difficulty: 4 of 5Under Smart prisoners always get a break #2 (in Logic)
Posted on 2007-03-07 (12 Comments)
Some Thoughts re: Another way by Charlie (2007-03-07 12:07:04)
Some Thoughts Another way by Charlie (2007-03-07 11:52:17)
Some Thoughts re(2): only 99% sure by Charlie (2007-03-07 11:38:57)
Some Thoughts re: only 99% sure by Charlie (2007-03-07 11:20:07)
Some Thoughts only 99% sure by Charlie (2007-03-07 10:48:24)
Difficulty: 3 of 5Under Hello My Name is . . . (in Liars and Knights)
Posted on 2007-03-06 (8 Comments)
re: Alternate Solution by Charlie (2007-03-06 16:02:48)
Solution As the computer does it. by Charlie (2007-03-06 15:55:33)
Difficulty: 2 of 5Under 2+2 (in Tricks)
Posted on 2007-03-04 (17 Comments)
re: Darn, where's that dictionary? by Charlie (2007-03-04 17:37:46)
Difficulty: 2 of 5Under The Cross in the Trapezoid (in Geometry)
Posted on 2007-03-03 (4 Comments)
Solution Lacking insight ... (spoiler) by Charlie (2007-03-03 12:00:45)
Difficulty: 4 of 5Under PanMagic (in Numbers)
Posted on 2007-03-02 (5 Comments)
re: Programming Lessons here. by Charlie (2007-03-13 09:45:00)
Solution computer solution by Charlie (2007-03-03 00:44:17)
Difficulty: 1 of 5Under Volume of a Cuboid (in Geometry)
Posted on 2007-03-02 (7 Comments)
Solution Quicker solution by Charlie (2007-03-02 09:29:11)
Difficulty: 5 of 5Under Cutting Corners (in Geometry)
Posted on 2007-02-27 (22 Comments)
found the error in my irregular quadrilateral program by Charlie (2007-03-04 21:17:24)
re: interesting comparison: regular vs irregular by Charlie (2007-02-28 22:39:05)
interesting comparison: regular vs irregular by Charlie (2007-02-28 22:09:39)
tabulating F for the triangle, square and regular pentagon by Charlie (2007-02-28 21:39:56)
Some Thoughts part d by Charlie (2007-02-27 22:25:30)
Some Thoughts comment on part c by Charlie (2007-02-27 15:58:44)
Difficulty: 2 of 5Under Tough Negotiations (in Numbers)
Posted on 2007-02-27 (3 Comments)
Solution computer search by Charlie (2007-02-27 10:52:17)
Difficulty: 3 of 5Under Summing Digits (in Numbers)
Posted on 2007-02-26 (5 Comments)
Solution solution by Charlie (2007-02-26 16:07:38)
Difficulty: 2 of 5Under Tile Challenge (in Logic)
Posted on 2007-02-24 (12 Comments)
Solution re: Apology - Correction by Charlie (2007-02-25 14:21:04)
re: solution by Charlie (2007-02-25 13:23:35)
re: Missing information? ... Hmmm... by Charlie (2007-02-24 16:10:38)
Difficulty: 2 of 5Under Widescreen vs traditional (in Just Math)
Posted on 2007-02-23 (5 Comments)
Solution re: Read the question properly by Charlie (2007-02-24 07:43:59)
Solution solution by Charlie (2007-02-23 09:56:03)
Difficulty: 4 of 5Under Funky Fibonacci Fractions (in Numbers)
Posted on 2007-02-22 (5 Comments)
Solution re: Unsatisfying answer (spoiler...sort of) ... and further by Charlie (2007-02-22 16:08:35)
Solution Unsatisfying answer (spoiler...sort of) by Charlie (2007-02-22 16:02:20)
Difficulty: 3 of 5Under Weighing Coins (in Weights and Scales)
Posted on 2007-02-21 (6 Comments)
Solution solution by Charlie (2007-02-21 17:01:05)
Difficulty: 3 of 5Under Urn, urn, urn (in Probability)
Posted on 2007-02-20 (5 Comments)
Solution part 2: brute force by Charlie (2007-02-20 17:03:26)
Difficulty: 3 of 5Under What is RIGHT? (in Logic)
Posted on 2007-02-17 (4 Comments)
re(2): Solution - don't peek by Charlie (2007-02-18 12:00:20)
Difficulty: 2 of 5Under Name this city (in General)
Posted on 2007-02-15 (3 Comments)
and the program by Charlie (2007-02-15 11:59:34)
Some Thoughts re: some cities that meet the distance criteria by Charlie (2007-02-15 11:57:47)
Some Thoughts some cities that meet the distance criteria by Charlie (2007-02-15 11:50:27)
Difficulty: 2 of 5Under Bux in a Box (in Games)
Posted on 2007-02-14 (3 Comments)
re: solution -- overall chances of coming out ahead by Charlie (2007-02-14 11:23:53)
Solution solution by Charlie (2007-02-14 10:38:11)
Difficulty: 5 of 5Under Pages and Squires (in Liars and Knights)
Posted on 2007-02-13 (7 Comments)
Solution computer solution by Charlie (2007-02-13 17:12:20)
Difficulty: 3 of 5Under Painted Sphere (in Geometry)
Posted on 2007-02-13 (9 Comments)
re(2): Solution by Charlie (2007-02-14 14:21:18)
re: Simplify by Charlie (2007-02-13 17:43:43)
re: Underdefined solution by Charlie (2007-02-13 12:22:25)
Difficulty: 3 of 5Under Come Sail Away (in Science)
Posted on 2007-02-12 (10 Comments)
re(4): solution by Charlie (2007-02-14 23:55:57)
re(2): solution by Charlie (2007-02-14 10:06:57)
Solution solution by Charlie (2007-02-13 09:17:02)
Difficulty: 3 of 5Under Pushing numbers (in Logic)
Posted on 2007-02-12 (4 Comments)
Solution computer solution by Charlie (2007-02-12 11:01:51)
Difficulty: 3 of 5Under Train Station (in Just Math)
Posted on 2007-02-11 (6 Comments)
Solution The presumably intended solution (spoiler). by Charlie (2007-02-11 13:07:00)
Difficulty: 2 of 5Under A Birthday Problem (in General)
Posted on 2007-02-08 (2 Comments)
re: No Subject by Charlie (2007-02-08 09:50:11)
Difficulty: 3 of 5Under Letter groups (in Word Problems)
Posted on 2007-02-07 (7 Comments)
Some Thoughts the only things I notice... by Charlie (2007-02-08 10:55:03)
Difficulty: 3 of 5Under Arabian Nights (in Numbers)
Posted on 2007-02-06 (2 Comments)
Solution solution by Charlie (2007-02-06 10:38:05)
Difficulty: 3 of 5Under Prison Challenge (in Just Math)
Posted on 2007-02-05 (7 Comments)
Solution solution by Charlie (2007-02-05 14:35:14)
Difficulty: 2 of 5Under Connecting the Points (in General)
Posted on 2007-02-04 (8 Comments)
re: Picture of Optimized solution by Charlie (2007-02-05 17:24:20)
re: A solution by Charlie (2007-02-04 15:40:49)
Difficulty: 3 of 5Under This Poem Is Much Too Deep For You (in General)
Posted on 2007-02-03 (5 Comments)
Solution Is it just ... (spoiler?) by Charlie (2007-02-03 15:37:25)
Difficulty: 4 of 5Under How many solutions? (in Just Math)
Posted on 2007-01-31 (4 Comments)
Solution solution (spoiler) by Charlie (2007-01-31 11:26:34)
Difficulty: 3 of 5Under Logidoku-8 (in Logic)
Posted on 2007-01-24 (10 Comments)
re: POSSIBLE OTHER SOLUTION by Charlie (2007-02-24 07:47:06)
Difficulty: 3 of 5Under Real and Complex (in Just Math)
Posted on 2007-01-23 (4 Comments)
Solution Excel solution by Charlie (2007-01-23 16:19:15)
Difficulty: 3 of 5Under Alien Messages (in Science)
Posted on 2007-01-23 (4 Comments)
re(3): from general knowledge (spoiler) by Charlie (2007-01-24 16:19:51)
Solution from general knowledge (spoiler) by Charlie (2007-01-24 10:20:21)
Difficulty: 5 of 5Under Binary Repunit Fibonaccis (in Numbers)
Posted on 2007-01-22 (6 Comments)
Question re: A possible solution (spoiler) by Charlie (2007-03-22 14:48:34)
Difficulty: 3 of 5Under 12 digit number (in Numbers)
Posted on 2007-01-22 (3 Comments)
Hints/Tips unsatisfying proof, by exhaustion, but may serve as a hint by Charlie (2007-01-22 11:26:10)
Difficulty: 2 of 5Under Another Item Puzzle (in Logic)
Posted on 2007-01-21 (8 Comments)
Solution Uh, Oh! (solution/spoiler present) by Charlie (2007-01-21 11:41:01)
Difficulty: 2 of 5Under Letter Swap (in General)
Posted on 2007-01-19 (9 Comments)
re: With a little help from Small Hint (Possible Spoiler) by Charlie (2007-01-22 14:48:52)
Difficulty: 4 of 5Under Stellar Words (in Sequences)
Posted on 2007-01-18 (11 Comments)
re: Solution by Charlie (2007-03-27 14:13:39)
Hints/Tips re(2): Seconds on that by Charlie (2007-01-26 12:09:45)
re(2): Seconds on that by Charlie (2007-01-23 16:31:52)
Hints/Tips Hint 2 by Charlie (2007-01-22 11:45:08)
Hints/Tips Hint by Charlie (2007-01-20 12:19:53)
Difficulty: 2 of 5Under Biz buz baz - Part I (in Numbers)
Posted on 2007-01-18 (4 Comments)
Solution Non-Analytical (computer) solution (spoiler) by Charlie (2007-01-18 11:28:06)
Difficulty: 2 of 5Under A Vanishing Polynomial Problem (in Calculus)
Posted on 2007-01-17 (2 Comments)
Solution solution by Charlie (2007-01-17 10:52:41)
Difficulty: 3 of 5Under Hole-some Countries (in Word Problems)
Posted on 2007-01-16 (11 Comments)
Solution computer solution by Charlie (2007-01-16 15:21:28)
Difficulty: 3 of 5Under Three Altitudes (in Geometry)
Posted on 2007-01-15 (3 Comments)
Solution researched solution by Charlie (2007-01-15 23:21:07)
Difficulty: 3 of 5Under Guess Again (in Probability)
Posted on 2007-01-15 (5 Comments)
Solution solution by Charlie (2007-01-15 12:31:23)
Difficulty: 5 of 5Under Perplexing folds (in Shapes)
Posted on 2007-01-10 (4 Comments)
Question re: One possible solution? by Charlie (2007-01-11 09:27:10)
Difficulty: 2 of 5Under Map Projection (in Shapes)
Posted on 2007-01-03 (5 Comments)
re: thoughts and maybe a partial solution by Charlie (2007-01-03 10:27:02)
Difficulty: 3 of 5Under Equal Areas and Perimeters (in Geometry)
Posted on 2007-01-02 (1 Comments)
Solution solution by Charlie (2007-01-02 13:50:19)
Difficulty: 3 of 5Under Torus paradox (in Paradoxes)
Posted on 2007-01-02 (8 Comments)
re(2): solution by Charlie (2007-01-02 13:34:37)
Solution solution by Charlie (2007-01-02 08:40:00)
Difficulty: 3 of 5Under Snookered! (Part I) (in Science)
Posted on 2007-01-01 (4 Comments)
Solution re: solution by Charlie (2007-01-06 11:16:34)
Solution solution by Charlie (2007-01-01 12:36:58)
Difficulty: 2 of 5Under An inscribed circle problem (in Geometry)
Posted on 2006-12-31 (2 Comments)
Solution solution by Charlie (2006-12-31 12:52:35)
Difficulty: 3 of 5Under Number power (in Numbers)
Posted on 2006-12-30 (5 Comments)
Solution All the digits. by Charlie (2006-12-30 16:31:31)
Solution I get a different first two digits by Charlie (2006-12-30 11:17:33)
Difficulty: 5 of 5Under The art of fencing (in Shapes)
Posted on 2006-12-27 (6 Comments)
Hints/Tips idea by Charlie (2006-12-27 14:50:58)
Difficulty: 3 of 5Under Box it up (in General)
Posted on 2006-12-26 (4 Comments)
re: Paper cutouts by Charlie (2006-12-27 09:32:27)
Solution Paper cutouts by Charlie (2006-12-27 09:29:53)
Difficulty: 2 of 5Under Time And Distance Problem (in General)
Posted on 2006-12-24 (3 Comments)
Solution Algebraic solution by Charlie (2006-12-24 14:01:17)
Solution Excel solution by Charlie (2006-12-24 13:42:23)
Difficulty: 3 of 5Under Square Search (in General)
Posted on 2006-12-21 (5 Comments)
Hints/Tips heuristic computer exploration (spoiler) by Charlie (2006-12-21 15:37:28)
Difficulty: 3 of 5Under Colored Bead Combos (in Probability)
Posted on 2006-12-17 (3 Comments)
Solution solution by Charlie (2006-12-17 13:00:07)
Difficulty: 3 of 5Under Magic circle (in General)
Posted on 2006-12-16 (7 Comments)
re: Solution by Charlie (2006-12-19 08:50:26)
Difficulty: 4 of 5Under Inverted Primes (in Numbers)
Posted on 2006-12-15 (7 Comments)
Solution Solution without Internet search or Excel by Charlie (2006-12-15 11:15:45)
Difficulty: 3 of 5Under A Smallest Integer Problem (in Numbers)
Posted on 2006-12-13 (2 Comments)
Hints/Tips thoughts by Charlie (2006-12-13 08:44:48)
Difficulty: 3 of 5Under Rainbow Triplets (in Word Problems)
Posted on 2006-12-12 (8 Comments)
re: No Subject by Charlie (2006-12-12 14:23:51)
Solution No Subject by Charlie (2006-12-12 14:20:26)
Difficulty: 2 of 5Under A LPP Puzzle (in General)
Posted on 2006-12-11 (2 Comments)
re: solution -- Correction to Part I by Charlie (2006-12-12 20:50:39)
Solution solution by Charlie (2006-12-11 11:01:04)
Difficulty: 3 of 5Under Mean Quest (in General)
Posted on 2006-12-10 (15 Comments)
re: An off topic question about formatting by Charlie (2006-12-11 11:11:15)
Question re: A and D don't matter by Charlie (2006-12-11 09:34:36)
Difficulty: 4 of 5Under BRIAN = LINDA = LEVIK = CORAL (in Numbers)
Posted on 2006-12-08 (9 Comments)
re(2): the programmatic way by Charlie (2006-12-08 23:38:55)
Solution the programmatic way by Charlie (2006-12-08 11:02:45)
Difficulty: 2 of 5Under A Refuel Time Problem (in General)
Posted on 2006-12-08 (3 Comments)
Solution re: solution -- because by Charlie (2006-12-08 10:24:30)
Difficulty: 3 of 5Under The Day of the Locus (in Shapes)
Posted on 2006-12-07 (3 Comments)
Solution solution by Charlie (2006-12-07 10:48:33)
Difficulty: 2 of 5Under Horoscope Hijinks II (in General)
Posted on 2006-12-05 (4 Comments)
Solution solution by Charlie (2006-12-05 14:26:51)
Difficulty: 2 of 5Under Squareless (in Shapes)
Posted on 2006-12-04 (6 Comments)
Solution solution by Charlie (2006-12-04 12:12:30)
Difficulty: 3 of 5Under Duplicate Digit Determination (in Numbers)
Posted on 2006-12-03 (6 Comments)
Solution Another solution without logs by Charlie (2006-12-04 09:11:08)
Solution solution by Charlie (2006-12-03 11:05:20)
Difficulty: 2 of 5Under A Constant Puzzle (in Just Math)
Posted on 2006-12-02 (4 Comments)
re: solutions (spoiler) by Charlie (2006-12-02 14:31:00)
Solution extreme analysis by Charlie (2006-12-02 14:17:02)
Difficulty: 3 of 5Under Three Sum Problem (in Probability)
Posted on 2006-12-01 (4 Comments)
Solution solution by Charlie (2006-12-01 08:49:39)
Difficulty: 3 of 5Under Sum crazy dice (in Probability)
Posted on 2006-11-30 (8 Comments)
re(2): Part c) clarified. intended solution?? by Charlie (2006-12-01 15:03:13)
re: Part c) clarified. by Charlie (2006-12-01 14:58:41)
re: Solution -- I don't understand part c by Charlie (2006-11-30 14:49:04)
Difficulty: 3 of 5Under Perpetual Primes Production? (in Numbers)
Posted on 2006-11-29 (12 Comments)
re: A bet by Charlie (2006-11-30 09:07:59)
Difficulty: 4 of 5Under Horoscope Hijinks I (in General)
Posted on 2006-11-28 (9 Comments)
re(2): Smaller Zodiacs by Charlie (2006-11-28 16:08:21)
Solution Can this be done without a computer? -- computer solution by Charlie (2006-11-28 16:00:11)
Difficulty: 2 of 5Under Unusual Equation Problem (in Just Math)
Posted on 2006-11-28 (2 Comments)
Solution solution by Charlie (2006-11-28 10:37:49)
Difficulty: 3 of 5Under Parallel Bisections (in Geometry)
Posted on 2006-11-27 (3 Comments)
re(2): Solution -- ok, I see by Charlie (2006-11-27 13:28:02)
Question re: Solution by Charlie (2006-11-27 13:24:37)
Difficulty: 4 of 5Under ABCD (in Logic)
Posted on 2006-11-26 (33 Comments)
Solution solution unique --- and how the computer program finds it by Charlie (2006-11-26 13:07:29)
Difficulty: 3 of 5Under Geometric calculator (in Geometry)
Posted on 2006-11-24 (3 Comments)
first four by Charlie (2006-11-24 10:49:53)
Difficulty: 1 of 5Under Chicken or Egg (in Tricks)
Posted on 2006-11-21 (20 Comments)
Some Thoughts well... by Charlie (2006-11-21 09:21:55)
Difficulty: 3 of 5Under Arbitrary Adventures Analysis (in General)
Posted on 2006-11-20 (10 Comments)
Solution re(3): Program needed . . . by Charlie (2006-11-20 15:52:58)
Solution re: Program needed . . . by Charlie (2006-11-20 14:39:01)
re: maybe solution -- on second thought by Charlie (2006-11-20 12:25:05)
Solution maybe solution by Charlie (2006-11-20 11:47:22)
Difficulty: 5 of 5Under Circular map (in Geometry)
Posted on 2006-11-15 (29 Comments)
re: A thought by Charlie (2006-11-16 10:42:11)
Difficulty: 5 of 5Under Ceremonial Stones (in Weights and Scales)
Posted on 2006-11-14 (26 Comments)
re(2): A computer exploration -- solution??? by Charlie (2006-11-15 08:56:13)
Hints/Tips re: A computer exploration -- solution??? -- how to get the numbers by Charlie (2006-11-14 23:50:02)
Hints/Tips A computer exploration -- solution??? by Charlie (2006-11-14 23:42:00)
re(2): upper limit by Charlie (2006-11-14 23:33:40)
Some Thoughts upper limit by Charlie (2006-11-14 13:45:30)
Difficulty: 2 of 5Under Nets, Sectors and Cones (in Geometry)
Posted on 2006-11-12 (3 Comments)
Solution solution by Charlie (2006-11-12 15:22:28)
Difficulty: 3 of 5Under A Realmebon Problem (in Numbers)
Posted on 2006-11-11 (2 Comments)
Solution re: brute force by Charlie (2006-11-11 16:21:02)
Difficulty: 2 of 5Under A Sign Problem (in Probability)
Posted on 2006-11-10 (1 Comments)
Solution solution by Charlie (2006-11-10 09:04:14)
Difficulty: 2 of 5Under Geometric Integers (in Just Math)
Posted on 2006-11-09 (6 Comments)
Solution computer solution by Charlie (2006-11-09 14:02:37)
Difficulty: 4 of 5Under Logidoku (in Logic)
Posted on 2006-11-06 (15 Comments)
Solution solution by Charlie (2006-11-06 16:10:46)
Difficulty: 3 of 5Under Prime Numbers in a Ten (in Numbers)
Posted on 2006-11-06 (7 Comments)
re(3): spoiler -- more by Charlie (2006-11-18 16:36:09)
Solution re: spoiler -- more by Charlie (2006-11-06 09:13:22)
Difficulty: 2 of 5Under Mister Resistor (in Science)
Posted on 2006-11-03 (108 Comments)
image has been lost by Charlie (2018-03-09 08:41:46)
Difficulty: 3 of 5Under 4-gon Probability (in Probability)
Posted on 2006-11-03 (2 Comments)
Hints/Tips outline of part 1; solution part 2 by Charlie (2006-11-03 09:55:11)
Difficulty: 3 of 5Under The Holy Cannoli (in Shapes)
Posted on 2006-11-01 (8 Comments)
Solution a couple of extra significant digits (using Bessel J1) by Charlie (2006-11-04 10:59:39)
re: Integrating the other way by Charlie (2006-11-01 20:07:53)
Solution solution--but there's plenty of room for error by Charlie (2006-11-01 16:05:49)
Difficulty: 4 of 5Under Mistress of the Ring (in Word Problems)
Posted on 2006-10-28 (5 Comments)
Hints/Tips re: what I could come up with by Charlie (2006-10-28 12:31:16)
Hints/Tips what I could come up with by Charlie (2006-10-28 12:26:51)
Difficulty: 3 of 5Under Button puzzle (2) (in General)
Posted on 2006-10-27 (11 Comments)
re(5): Solution by Charlie (2006-11-06 09:39:22)
Question re: Solution by Charlie (2006-11-05 15:17:21)
Difficulty: 2 of 5Under Further Harmonic Integers (in Just Math)
Posted on 2006-10-27 (1 Comments)
Solution computer solution--spoiler by Charlie (2006-10-27 11:42:05)
Difficulty: 2 of 5Under Four Squared (in Logic)
Posted on 2006-10-26 (18 Comments)
re(2): computer solution by Charlie (2006-10-27 09:22:36)
Solution computer solution by Charlie (2006-10-26 16:11:07)
Difficulty: 3 of 5Under Tree planting exercise (in Geometry)
Posted on 2006-10-21 (11 Comments)
Solution part 1 by Charlie (2006-10-21 19:27:58)
Difficulty: 3 of 5Under Letter ratios (in Word Problems)
Posted on 2006-10-20 (11 Comments)
Solution from computer list by Charlie (2006-10-20 09:31:12)
Difficulty: 3 of 5Under Hyper-diamond (in Shapes)
Posted on 2006-10-19 (2 Comments)
Solution most of a solution by Charlie (2006-10-19 12:28:33)
Difficulty: 5 of 5Under Radioactive Coins (in Weights and Scales)
Posted on 2006-10-17 (20 Comments)
Some Thoughts information theory vs. practicalities by Charlie (2006-10-17 15:25:05)
Difficulty: 3 of 5Under Sesquipedalian & Three-Quarter Ranch (in General)
Posted on 2006-10-15 (6 Comments)
Solution solution? by Charlie (2006-10-15 15:52:19)
Difficulty: 2 of 5Under Button puzzle (in General)
Posted on 2006-10-13 (7 Comments)
Question re: 3 moves i got by Charlie (2006-10-15 17:20:39)
Solution All the ways using the least presses by Charlie (2006-10-13 11:10:45)
Difficulty: 4 of 5Under 20 numbers and 8 primes (in Numbers)
Posted on 2006-10-12 (8 Comments)
re: program exploration (spoiler?) -- extended sequence of starting integers by Charlie (2006-10-14 14:02:33)
re(3): Confessions and a new problem, thanks to Charlie by Charlie (2006-10-13 11:46:21)
re: Confessions and a new problem, thanks to Charlie by Charlie (2006-10-12 15:48:47)
Hints/Tips program exploration (spoiler?) by Charlie (2006-10-12 14:07:27)
Difficulty: 3 of 5Under The digits and square numbers (in Numbers)
Posted on 2006-10-12 (4 Comments)
Solution computer solution (spoiler) by Charlie (2006-10-12 11:35:28)
Difficulty: 3 of 5Under Top Spin (in Logic)
Posted on 2006-10-11 (15 Comments)
re: different solution than the others... by Charlie (2006-11-06 10:11:46)
Difficulty: 4 of 5Under On Target (in Geometry)
Posted on 2006-10-09 (7 Comments)
correction made to problem by Charlie (2006-10-10 09:25:28)
Difficulty: 2 of 5Under An Ingenious Sum Puzzle (in Numbers)
Posted on 2006-10-09 (3 Comments)
Solution solution (spoiler) by Charlie (2006-10-09 10:44:32)
Difficulty: 2 of 5Under Two Mirrors (in Geometry)
Posted on 2006-10-08 (4 Comments)
Hints/Tips playing with Geometer's Sketchpad (spoiler) by Charlie (2006-10-08 13:04:40)
Difficulty: 3 of 5Under Pandigital Multiplication and Division (in Numbers)
Posted on 2006-10-07 (8 Comments)
re: This seems like one problem, not two (spoiler) by Charlie (2006-10-07 09:15:21)
Difficulty: 2 of 5Under Consumer Mathematics - Compound Interest (in Just Math)
Posted on 2006-10-04 (6 Comments)
Solution analytic solution by Charlie (2006-10-04 11:08:24)
Difficulty: 3 of 5Under Oddwins (in Games)
Posted on 2006-10-03 (11 Comments)
Solution for 13 marbles, 15 marbles by Charlie (2006-10-04 09:34:28)
Solution for 11 marbles by Charlie (2006-10-04 09:20:20)
Difficulty: 3 of 5Under A rational number problem (in Numbers)
Posted on 2006-10-02 (12 Comments)
re: The rest by Charlie (2006-10-07 00:27:02)
Solution here they are by Charlie (2006-10-06 16:20:12)
re: Primes correction by Charlie (2006-10-06 15:57:52)
re(2): Got it by Charlie (2006-10-04 00:08:54)
re: Got it by Charlie (2006-10-02 15:04:58)
Difficulty: 2 of 5Under Another 2006 Problem (in Just Math)
Posted on 2006-09-30 (9 Comments)
re: A Computer Assisted look ??? by Charlie (2006-10-01 10:17:41)
re(2): Solution by Charlie (2006-09-30 13:49:50)
Difficulty: 4 of 5Under Eight Gates (in Games)
Posted on 2006-09-29 (4 Comments)
Solution the ways by Charlie (2006-09-29 15:39:01)
Difficulty: 4 of 5Under Pretty Picture (in Logic)
Posted on 2006-09-27 (12 Comments)
re: Solution by Charlie (2006-09-28 10:57:12)
Difficulty: 3 of 5Under Margana (in Word Problems)
Posted on 2006-09-27 (8 Comments)
Solution re: Another solution by Charlie (2006-09-27 10:12:29)
Difficulty: 4 of 5Under Another Divisibility Puzzle (in Just Math)
Posted on 2006-09-25 (6 Comments)
re: General Observation -- program bug by Charlie (2006-09-26 23:05:17)
Solution re: part 2: the only one -- part 1 variant by Charlie (2006-09-25 14:51:40)
Solution part 2: the only one by Charlie (2006-09-25 14:37:59)
Difficulty: 3 of 5Under Repeating decimals (in Numbers)
Posted on 2006-09-25 (12 Comments)
Hints/Tips re: computer exploration by Charlie (2006-09-25 11:35:02)
Hints/Tips computer exploration by Charlie (2006-09-25 11:03:49)
Difficulty: 4 of 5Under A quotient and square problem (in Numbers)
Posted on 2006-09-23 (5 Comments)
Hints/Tips prelimanary findings by Charlie (2006-09-23 16:05:01)
Difficulty: 3 of 5Under Needed: a large calculator! (in Numbers)
Posted on 2006-09-22 (7 Comments)
re: some thoughts by Charlie (2006-09-22 22:25:45)
re: Part 1 spoiler: Be sure the calculator's large enough; soln to part 1 by Charlie (2006-09-22 15:44:53)
Solution Part 2 spoiler by Charlie (2006-09-22 14:26:48)
Part 1 spoiler: Be sure the calculator's large enough; soln to part 1 by Charlie (2006-09-22 13:43:45)
Difficulty: 5 of 5Under Can you match them up? (in Just Math)
Posted on 2006-09-21 (6 Comments)
re: part 3 by Charlie (2006-09-21 15:25:05)
first one is easy; the rest hard by Charlie (2006-09-21 14:08:22)
Difficulty: 2 of 5Under Take five! (in Numbers)
Posted on 2006-09-21 (4 Comments)
Solution computer assisted solution by Charlie (2006-09-21 13:54:59)
Difficulty: 3 of 5Under A permutation puzzle (in Just Math)
Posted on 2006-09-20 (6 Comments)
Solution re: k <= 1,2,3,4,5,6 by Charlie (2020-11-24 20:36:07)
Solution computer solution by Charlie (2020-11-24 12:44:13)
Difficulty: 4 of 5Under compoundwordplay (in Word Problems)
Posted on 2006-09-20 (5 Comments)
partial for #10 by Charlie (2006-09-22 08:13:41)
Difficulty: 4 of 5Under Magic 8's (in Numbers)
Posted on 2006-09-18 (8 Comments)
re: Solution by Charlie (2006-09-18 20:41:15)
Solution solution by Charlie (2006-09-18 15:51:46)
Difficulty: 3 of 5Under A DEEP ROOT Problem (in Numbers)
Posted on 2006-09-17 (3 Comments)
Solution solution by Charlie (2006-09-17 13:55:22)
Difficulty: 2 of 5Under Another Time And Work Problem (in General)
Posted on 2006-09-14 (4 Comments)
Solution another way by Charlie (2006-09-14 14:02:05)
Difficulty: 1 of 5Under Strange glasses (in Science)
Posted on 2006-09-12 (9 Comments)
Solution solution by Charlie (2006-09-12 20:09:10)
Difficulty: 3 of 5Under Clean Tops (in Logic)
Posted on 2006-09-11 (9 Comments)
Solution 6 solutions? (spoiler -- computer used) by Charlie (2006-09-12 00:02:45)
re: Solution (spoiler) by Charlie (2006-09-11 23:45:51)
Difficulty: 3 of 5Under Numbers of letters of numbers of letters of... (in Sequences)
Posted on 2006-09-10 (15 Comments)
re: ordinal (other than english) by Charlie (2006-09-10 12:02:33)
re: ordinal (other than english) by Charlie (2006-09-10 11:38:37)
Difficulty: 3 of 5Under Cutting planes with polygons (in Shapes)
Posted on 2006-09-06 (17 Comments)
re(2): an equation by Charlie (2006-09-06 16:11:28)
re: First speculation by Charlie (2006-09-06 14:20:26)
Difficulty: 2 of 5Under Eleven Square Roots in a Logarithm (in Algorithms)
Posted on 2006-09-05 (7 Comments)
For the second part. by Charlie (2006-09-05 15:55:38)
Difficulty: 3 of 5Under divisible by 11? (in Numbers)
Posted on 2006-09-04 (17 Comments)
Hints/Tips almost solution by Charlie (2006-09-04 12:53:59)
Difficulty: 3 of 5Under As simple as it gets (in Liars and Knights)
Posted on 2006-09-02 (6 Comments)
re(2): Two ways by Charlie (2006-09-02 16:38:05)
Solution Two ways by Charlie (2006-09-02 11:52:38)
Difficulty: 4 of 5Under Evil powers (in Numbers)
Posted on 2006-08-31 (9 Comments)
Solution solution by Charlie (2006-08-31 13:51:05)
Difficulty: 3 of 5Under The Trent And Newley Families (in Just Math)
Posted on 2006-08-31 (2 Comments)
Solution solution by Charlie (2006-08-31 09:41:04)
Difficulty: 2 of 5Under Identical Opposites (in Word Problems)
Posted on 2006-08-29 (5 Comments)
Hints/Tips hint by Charlie (2006-08-29 10:42:36)
Difficulty: 4 of 5Under Spacy colors (in Just Math)
Posted on 2006-08-25 (10 Comments)
re: treja vu - solution by Charlie (2006-08-25 15:58:03)
Difficulty: 3 of 5Under Six Tenants Problem (in Logic)
Posted on 2006-08-25 (21 Comments)
re: Slightly different answer by Charlie (2006-09-11 13:52:07)
re(2): Solution by Charlie (2006-09-01 08:23:41)
Difficulty: 4 of 5Under Summing or Multiplying (in Numbers)
Posted on 2006-08-21 (21 Comments)
re: An extra question -- spoiler by Charlie (2006-08-22 14:24:01)
re(2): An extra question - solution (spoiler) by Charlie (2006-08-22 14:19:57)
Solution re(2): With a program by Charlie (2006-08-21 22:32:07)
simple solution to simple part by Charlie (2006-08-21 09:52:08)
Difficulty: 1 of 5Under Millenium problem (in Numbers)
Posted on 2006-08-21 (15 Comments)
re: -10 for grammar by Charlie (2006-08-23 14:15:39)
Difficulty: 3 of 5Under LCM Sequence (in Sequences)
Posted on 2006-08-19 (7 Comments)
re(3): Just a guess... -- proof by Charlie (2006-08-19 19:18:23)
Solution re: Just a guess... -- proof by Charlie (2006-08-19 16:21:41)
Difficulty: 3 of 5Under Points on a plane (in Geometry)
Posted on 2006-08-18 (5 Comments)
re: How Leonhard would solve it by Charlie (2006-08-19 00:03:53)
A guess by Charlie (2006-08-18 16:15:32)
Difficulty: 3 of 5Under Picking cards (in Probability)
Posted on 2006-08-17 (8 Comments)
Question re: Solution by Charlie (2006-08-19 16:29:35)
re(2): solution -- spoiler by Charlie (2006-08-17 20:08:42)
Solution solution -- spoiler by Charlie (2006-08-17 11:40:25)
Difficulty: 4 of 5Under Weird function challenge (in Calculus)
Posted on 2006-08-15 (33 Comments)
Question Needless to say this is very confusing by Charlie (2006-08-19 16:44:09)
Difficulty: 4 of 5Under An Atypical Evaluation (in Just Math)
Posted on 2006-08-13 (6 Comments)
computer exploration--possible spoiler by Charlie (2006-08-13 12:00:31)
Difficulty: 3 of 5Under Card game (in Games)
Posted on 2006-08-12 (8 Comments)
mathematical description of tables in computer solution by Charlie (2006-08-13 11:34:42)
Solution computer assisted solution by Charlie (2006-08-12 16:07:57)
Difficulty: 4 of 5Under Circular Logic III (in Geometry)
Posted on 2006-08-09 (3 Comments)
re(2): can this be simplified? -- spoiler by Charlie (2006-08-09 13:46:54)
Solution can this be simplified? -- spoiler by Charlie (2006-08-09 10:47:16)
Difficulty: 3 of 5Under Sign of a Permutation (in Algorithms)
Posted on 2006-08-05 (11 Comments)
re(2): No Subject by Charlie (2006-08-07 13:10:13)
Solution re: Solution by Charlie (2006-08-05 17:24:50)
Difficulty: 3 of 5Under Find the J (in Word Problems)
Posted on 2006-08-04 (26 Comments)
re(2): solution by Charlie (2006-08-07 08:30:19)
Solution solution by Charlie (2006-08-04 14:49:24)
Difficulty: 3 of 5Under 3D Engineering problem (in Shapes)
Posted on 2006-08-02 (16 Comments)
part 1 solution; thoughts on part 2 by Charlie (2006-08-02 14:29:52)
Difficulty: 3 of 5Under Object sliding (in Science)
Posted on 2006-08-01 (9 Comments)
Solution Two methods by Charlie (2006-08-01 16:38:39)
Difficulty: 2 of 5Under Chess Strategy (in Logic)
Posted on 2006-08-01 (8 Comments)
re: probablistic proof :-D by Charlie (2006-08-01 11:40:04)
re: Too simple by Charlie (2006-08-01 09:12:17)
Difficulty: 3 of 5Under Tricky Ten Digit Number (in Numbers)
Posted on 2006-07-31 (11 Comments)
Solution computer program by Charlie (2006-07-31 14:11:55)
Difficulty: 3 of 5Under A deceiving riddle (in Riddles)
Posted on 2006-07-31 (36 Comments)
possibilities by Charlie (2006-07-31 10:20:28)
Difficulty: 2 of 5Under A Cute Triangle (in Geometry)
Posted on 2006-07-21 (4 Comments)
re(2): Solution by Charlie (2006-07-21 15:25:55)
Difficulty: 2 of 5Under When Is It Today? (in General)
Posted on 2006-07-11 (14 Comments)
Solution first part by Charlie (2006-07-11 15:02:42)
Difficulty: 3 of 5Under Which is Which (in Weights and Scales)
Posted on 2006-07-07 (15 Comments)
theoretic limit by Charlie (2006-07-09 13:47:35)
Difficulty: 4 of 5Under Arrange The Disks (in General)
Posted on 2006-07-04 (14 Comments)
128 ways for 1 through 8 by Charlie (2006-07-06 09:43:42)
re: A sampling of the trillions of solutions. by Charlie (2006-07-06 09:09:24)
Solution A sampling of the trillions of solutions. by Charlie (2006-07-06 09:04:45)
re: solution (if I understood correctly) by Charlie (2006-07-05 14:05:43)
Solution re(2): solution (with solution/spoiler) by Charlie (2006-07-05 12:23:15)
re(2): solution (with solution/spoiler) by Charlie (2006-07-04 22:00:56)
re: solution by Charlie (2006-07-04 13:43:37)
Difficulty: 2 of 5Under Birthdaze (in General)
Posted on 2006-06-30 (9 Comments)
Hints/Tips hints by Charlie (2006-06-30 11:22:56)
re: Solution? by Charlie (2006-06-30 11:12:38)
Difficulty: 3 of 5Under Letter Cubes 5 (in Word Problems)
Posted on 2006-06-28 (4 Comments)
Solution the computer way by Charlie (2006-06-28 14:09:10)
Difficulty: 3 of 5Under Further Arithmetic Integers (in Numbers)
Posted on 2006-06-27 (10 Comments)
Hints/Tips not a proof but may be spoiler by Charlie (2006-06-27 16:02:16)
Difficulty: 4 of 5Under Rising water levels (in Shapes)
Posted on 2006-06-26 (26 Comments)
re(2): Solution to 7b using numerical integration by Charlie (2006-07-04 00:50:44)
Solution Solution to 7b using numerical integration by Charlie (2006-07-03 19:53:01)
Question re: #7b Solution (with explanation) -- a numerical integration comparison by Charlie (2006-07-03 14:23:21)
re: solution #6 by Charlie (2006-06-29 09:17:07)
Difficulty: 4 of 5Under Gardener's Woe (in Just Math)
Posted on 2006-06-24 (27 Comments)
Solution re(2): Nicely done -- now through 7 seedlings by Charlie (2006-06-26 13:47:48)
Solution re: Nicely done -- 2 thru 6 seedlings by Charlie (2006-06-26 11:15:09)
Solution re(2): computer solution to 6 by Charlie (2006-06-26 09:48:59)
re: My solution for 6 seeds by Charlie (2006-06-25 20:02:02)
Solution computer solution to 6 by Charlie (2006-06-25 16:13:48)
Solution computer solution for 5 by Charlie (2006-06-25 15:07:10)
Difficulty: 2 of 5Under Another Locker Puzzle (in Just Math)
Posted on 2006-06-23 (3 Comments)
Solution computer assist (spoiler) by Charlie (2006-06-23 16:18:51)
Difficulty: 3 of 5Under Palindromic number counting (in Numbers)
Posted on 2006-06-22 (3 Comments)
special values (spoiler for that part) by Charlie (2006-06-22 09:41:13)
Difficulty: 3 of 5Under Integer Triangles (in Geometry)
Posted on 2006-06-21 (5 Comments)
Solution four more -- computer used by Charlie (2006-06-21 16:08:16)
Difficulty: 3 of 5Under Abramowitz And Bernhardt Families (in Numbers)
Posted on 2006-06-21 (4 Comments)
Solution Computer Assisted Solution (spoiler) by Charlie (2006-06-21 09:39:34)
Difficulty: 2 of 5Under Fiction Novel And Science Book Problem (in Just Math)
Posted on 2006-06-20 (5 Comments)
Solution another brute force by Charlie (2006-06-20 10:27:07)
Difficulty: 3 of 5Under Kalsdale To Lamsville (in General)
Posted on 2006-06-19 (2 Comments)
Solution solution by Charlie (2006-06-19 15:01:34)
Difficulty: 4 of 5Under A Cubic And Biquadratic Problem (in Just Math)
Posted on 2006-06-18 (1 Comments)
Solution computer solution (spoiler) by Charlie (2006-06-18 13:22:25)
Difficulty: 3 of 5Under Black and white hats (in Logic)
Posted on 2006-06-15 (21 Comments)
the problem by Charlie (2006-06-18 13:29:50)
Difficulty: 3 of 5Under Four Congruent Circles (in Geometry)
Posted on 2006-06-14 (5 Comments)
Solution If this is what is meant then this is a solution by Charlie (2006-06-14 15:50:31)
Difficulty: 3 of 5Under Trig meets Logs (in Numbers)
Posted on 2006-06-14 (2 Comments)
Solution non-rigorous "proof" for part 1; numerical computer solution for part 2 by Charlie (2006-06-14 13:08:05)
Difficulty: 5 of 5Under Pills they had 2 (in Logic)
Posted on 2006-06-13 (2 Comments)
Solution one solution; other possibilities; -- computer assisted (spoiler) by Charlie (2006-06-13 15:47:47)
Difficulty: 3 of 5Under An Octagonal Problem (in Just Math)
Posted on 2006-06-13 (2 Comments)
Solution re: For starters -- computer solution (spoiler) by Charlie (2006-06-13 11:07:39)
Difficulty: 3 of 5Under log the log (in Just Math)
Posted on 2006-06-11 (5 Comments)
Solution re: Willing to bet by Charlie (2006-06-11 11:36:08)
Difficulty: 2 of 5Under 1 Palindrome 1 (in Just Math)
Posted on 2006-06-10 (9 Comments)
some numbers by actual count by Charlie (2006-06-11 10:08:42)
re: partial solution by Charlie (2006-06-11 09:52:16)
Question question by Charlie (2006-06-10 18:34:59)
Difficulty: 3 of 5Under Happy Birthday (3) (in Probability)
Posted on 2006-06-09 (13 Comments)
re(3): thoughts by Charlie (2006-06-09 17:03:43)
re(5): thoughts by Charlie (2006-06-09 16:55:49)
re: solution -- simulation of 20,000 trials of n=19 by Charlie (2006-06-09 16:53:44)
re(3): thoughts by Charlie (2006-06-09 14:57:45)
Solution solution by Charlie (2006-06-09 11:50:07)
Difficulty: 3 of 5Under A dilution problem (in Just Math)
Posted on 2006-06-08 (6 Comments)
re: Parcial Solution by Charlie (2006-06-08 10:47:00)
Difficulty: 4 of 5Under The Ultimate Cribbage Hand (in Games)
Posted on 2006-06-07 (21 Comments)
Solution re(4): Part of the solution by Charlie (2006-06-08 09:19:09)
re: Hey Charlie by Charlie (2006-06-08 00:19:03)
re: Part of the solution by Charlie (2006-06-07 15:41:15)
Solution some help from the computer (spoiler) by Charlie (2006-06-07 15:38:26)
Question Why is J5555 only 29 pts? by Charlie (2006-06-07 14:08:00)
Difficulty: 4 of 5Under A Perfect Square Problem (in Just Math)
Posted on 2006-06-03 (10 Comments)
Solution computer solution--no proof (spoiler) by Charlie (2006-06-03 16:19:34)
re: Half an answer by Charlie (2006-06-03 13:09:50)
Difficulty: 3 of 5Under A Permissible Weight Problem (in General)
Posted on 2006-05-29 (2 Comments)
Solution spreadsheet solution (spoiler) by Charlie (2006-05-29 14:35:08)
Difficulty: 2 of 5Under Coin through a hole (in Shapes)
Posted on 2006-05-29 (24 Comments)
Solution summary by Charlie (2006-05-30 11:21:16)
re: my guess by Charlie (2006-05-29 13:10:19)
Solution my guess by Charlie (2006-05-29 12:59:01)
Difficulty: 5 of 5Under Domino arrangements (in General)
Posted on 2006-05-27 (8 Comments)
Solution Fully computerized solution by Charlie (2006-05-28 14:19:59)
Solution re: Pencil and paper solution by Charlie (2006-05-28 11:45:15)
Difficulty: 3 of 5Under Multicolored Coins (in Probability)
Posted on 2006-05-24 (10 Comments)
Solution re: Solution (with expl) by Charlie (2006-05-24 11:55:33)
Difficulty: 4 of 5Under Pills they had (in Logic)
Posted on 2006-05-23 (3 Comments)
Solution Solution -- computer assist by Charlie (2006-05-23 15:44:10)
Difficulty: 3 of 5Under Unfilled grid (in General)
Posted on 2006-05-23 (7 Comments)
re: Possible solution. by Charlie (2006-05-23 23:57:51)
Solution program finished by Charlie (2006-05-23 10:24:14)
Hints/Tips computer program still running, but so far... by Charlie (2006-05-23 09:41:16)
Difficulty: 3 of 5Under Game Over! (in Probability)
Posted on 2006-05-22 (15 Comments)
re: solution for question 2 by Charlie (2006-05-22 12:55:54)
Difficulty: 3 of 5Under Circumferential distances (in General)
Posted on 2006-05-21 (3 Comments)
Solution computer solution by Charlie (2006-05-21 20:05:35)
Difficulty: 2 of 5Under Triggy Trigonometry (in Geometry)
Posted on 2006-05-20 (7 Comments)
Solution solution by Charlie (2006-05-20 12:55:55)
re: A question by Charlie (2006-05-20 11:05:56)
Difficulty: 2 of 5Under Mutually disagreeing queens. (in General)
Posted on 2006-05-19 (6 Comments)
Solution solution by Charlie (2006-05-19 10:24:32)
Difficulty: 3 of 5Under Marbles in a Jar (in Probability)
Posted on 2006-05-18 (11 Comments)
re: A solution by Charlie (2006-05-19 09:23:08)
Solution re: solution -- the exact answer by Charlie (2006-05-18 13:49:42)
Solution solution by Charlie (2006-05-18 13:36:43)
Difficulty: 2 of 5Under How many Integers? (in Just Math)
Posted on 2006-05-18 (10 Comments)
Solution solution by Charlie (2006-05-18 09:11:23)
Difficulty: 2 of 5Under ABCDEABCDE is one (in General)
Posted on 2006-05-17 (4 Comments)
Solution computer solution (spoiler) and hint for analytic solution by Charlie (2006-05-17 10:35:45)
Difficulty: 3 of 5Under Square dissection (in Shapes)
Posted on 2006-05-16 (4 Comments)
Question re: Solution by Charlie (2006-05-16 10:25:22)
Difficulty: 2 of 5Under Cubes in a tin (in Shapes)
Posted on 2006-05-15 (24 Comments)
re: THE REAL SOLUTION 2 by Charlie (2006-05-19 11:21:07)
re: this should be the solution by Charlie (2006-05-16 10:46:31)
re: Dissenting opinion by Charlie (2006-05-15 14:19:57)
re: solution --whoops by Charlie (2006-05-15 10:02:47)
Solution solution by Charlie (2006-05-15 09:58:35)
Difficulty: 2 of 5Under Either / Or (in Numbers)
Posted on 2006-05-13 (19 Comments)
re: The answer by Charlie (2006-05-15 16:07:43)
re: That depends on what "or" is -- the truth values (spoilers) by Charlie (2006-05-13 12:59:49)
re: That depends on what "or" is -- the exclusive story (spoiler) by Charlie (2006-05-13 12:25:52)
Solution That depends on what "or" is -- computer solution by Charlie (2006-05-13 12:22:48)
Difficulty: 4 of 5Under Prime Factor (in Just Math)
Posted on 2006-05-12 (8 Comments)
Solution another way of saying it is by Charlie (2006-05-13 12:38:15)
Difficulty: 3 of 5Under Bit by Bit (in Cryptography)
Posted on 2006-05-12 (6 Comments)
Some Thoughts re: First hint by Charlie (2006-05-13 12:10:55)
Difficulty: 3 of 5Under Elemental chain of events (in Word Problems)
Posted on 2006-05-11 (4 Comments)
Solution computer solution by Charlie (2006-05-11 13:49:54)
Difficulty: 3 of 5Under Garden Path (in Geometry)
Posted on 2006-05-10 (12 Comments)
Solution solution by Charlie (2006-05-10 14:39:42)
Difficulty: 2 of 5Under What do you... (in Tricks)
Posted on 2006-05-09 (12 Comments)
Solution solutions by Charlie (2006-05-09 09:09:59)
Difficulty: 4 of 5Under Tidy Triangle (in Shapes)
Posted on 2006-05-05 (7 Comments)
Solution computer trial-and-error solution (spoiler) by Charlie (2006-05-05 15:32:40)
Difficulty: 2 of 5Under Hickory dickory dock, the spider went round the clock... (in Just Math)
Posted on 2006-05-05 (13 Comments)
re(2): speeds by Charlie (2006-05-05 13:39:21)
Solution speeds by Charlie (2006-05-05 09:27:30)
Difficulty: 1 of 5Under Square = half itself? (in Shapes)
Posted on 2006-05-04 (19 Comments)
re(2): alternatives by Charlie (2006-05-04 15:34:33)
Solution alternatives by Charlie (2006-05-04 10:05:01)
Difficulty: 2 of 5Under 35, 70, 105, 140... (in Numbers)
Posted on 2006-05-03 (9 Comments)
Solution solution by Charlie (2006-05-03 10:35:15)
Difficulty: 2 of 5Under Remainder: Part 2 (in Just Math)
Posted on 2006-05-02 (5 Comments)
Solution solution by Charlie (2006-05-02 09:25:35)
Difficulty: 3 of 5Under A Maypole Problem (in Geometry)
Posted on 2006-05-01 (8 Comments)
re: Mayday! Mayday! by Charlie (2006-05-02 14:24:04)
Difficulty: 2 of 5Under 100 squares (in Shapes)
Posted on 2006-04-30 (7 Comments)
Solution solution and discussion by Charlie (2006-04-30 20:10:08)
Difficulty: 2 of 5Under Assigning a wonky die (in Probability)
Posted on 2006-04-28 (4 Comments)
Solution More brute force by Charlie (2006-04-28 15:01:51)
Difficulty: 3 of 5Under View from Perplexus Tower (in General)
Posted on 2006-04-27 (9 Comments)
re: interesting variant by Charlie (2006-04-28 10:33:57)
Difficulty: 3 of 5Under Three from Nine (in Probability)
Posted on 2006-04-25 (12 Comments)
Solution computer solution by Charlie (2006-04-25 15:12:25)
Difficulty: 3 of 5Under How many perfect squares (in Just Math)
Posted on 2006-04-25 (19 Comments)
re(4): Partial Solution by Charlie (2006-04-25 11:16:22)
re(3): Partial Solution by Charlie (2006-04-25 11:03:53)
re(2): Partial Solution by Charlie (2006-04-25 10:05:05)
re: Partial Solution by Charlie (2006-04-25 09:54:50)
Difficulty: 3 of 5Under Figuring a wonky die (in Probability)
Posted on 2006-04-24 (6 Comments)
Solution solution by Charlie (2006-04-24 13:46:37)
Difficulty: 3 of 5Under A Composite Determination Problem (in Just Math)
Posted on 2006-04-23 (14 Comments)
Solution brute force by Charlie (2006-04-23 14:40:04)
Difficulty: 3 of 5Under Maths exam problem (in Numbers)
Posted on 2006-04-21 (14 Comments)
re(2): yes!!!! got it finally...... by Charlie (2022-12-10 10:23:29)
re: response to puzzle by Charlie (2006-04-25 08:44:54)
Solution computer solution by Charlie (2006-04-21 13:51:45)
Difficulty: 3 of 5Under Lim and Jill (in Riddles)
Posted on 2006-04-21 (12 Comments)
re(2): Solution ? by Charlie (2006-04-21 14:21:35)
Difficulty: 3 of 5Under Walking the Edge Part 2 (in Shapes)
Posted on 2006-04-20 (8 Comments)
Solution this is probably the best (fastest) strategy by Charlie (2006-04-20 10:42:40)
Difficulty: 4 of 5Under The Unknown Digits (in Just Math)
Posted on 2006-04-18 (2 Comments)
Solution solution by Charlie (2006-04-18 14:01:35)
Difficulty: 3 of 5Under Walking the Edge (in Shapes)
Posted on 2006-04-18 (6 Comments)
Solution solution by Charlie (2006-04-18 10:16:08)
Difficulty: 4 of 5Under Twins and their mistakes (in Logic)
Posted on 2006-04-17 (8 Comments)
Solution computer solution -- spoiler by Charlie (2006-04-17 21:00:23)
Difficulty: 5 of 5Under Some physics problems? (in Science)
Posted on 2006-04-16 (13 Comments)
Solution No Subject by Charlie (2006-04-17 09:23:37)
Difficulty: 4 of 5Under Remainders (in Numbers)
Posted on 2006-04-15 (4 Comments)
Solution computer solution by Charlie (2006-04-15 18:39:50)
Difficulty: 4 of 5Under Circular Jogging Track Problem 3 (in Just Math)
Posted on 2006-04-14 (3 Comments)
Solution solution by Charlie (2006-04-15 00:33:07)
Difficulty: 2 of 5Under That's a lotta numbers! (in Numbers)
Posted on 2006-04-14 (10 Comments)
Solution re: Is this it? -- computer verification by Charlie (2006-04-14 15:03:32)
Difficulty: 3 of 5Under Circular Jogging Track Problem 2 (in General)
Posted on 2006-04-13 (8 Comments)
re(2): solution by Charlie (2006-04-14 09:18:56)
Solution solution by Charlie (2006-04-13 14:59:38)
Difficulty: 3 of 5Under Which Biblical figure? (in Cryptography)
Posted on 2006-04-12 (9 Comments)
re(2): Partial Solution (Spoiler) by Charlie (2006-04-17 13:47:38)
Difficulty: 3 of 5Under Circular Jogging Track Problem (in General)
Posted on 2006-04-12 (11 Comments)
Solution re: A start? by Charlie (2006-04-12 10:49:51)
Difficulty: 3 of 5Under 3's & 7's (in Numbers)
Posted on 2006-04-09 (13 Comments)
Solution the computer doing the trial and error by Charlie (2006-04-09 23:53:36)
Difficulty: 4 of 5Under Arrow dice 2 (in Shapes)
Posted on 2006-04-06 (9 Comments)
Some Thoughts the longest I've gotten by Charlie (2006-04-06 22:06:43)
Some Thoughts a start by Charlie (2006-04-06 15:49:08)
Difficulty: 4 of 5Under Who is Elizabeth's Partner (in Logic)
Posted on 2006-04-04 (18 Comments)
Solution computer solution by Charlie (2006-04-04 16:25:37)
Difficulty: 2 of 5Under Three Friends And Herbivores (in General)
Posted on 2006-04-02 (3 Comments)
Solution the algebra by Charlie (2006-04-02 20:47:50)
Difficulty: 3 of 5Under Lack of transport (in General)
Posted on 2006-03-31 (7 Comments)
Solution solution by Charlie (2006-03-31 14:20:19)
Difficulty: 2 of 5Under The Dilemma of a Prisoner part 2 (in Tricks)
Posted on 2006-03-31 (17 Comments)
re: Slow down by Charlie (2006-03-31 11:07:32)
re: my solution by Charlie (2006-03-31 09:53:15)
Solution my solution by Charlie (2006-03-31 09:47:29)
Difficulty: 2 of 5Under The Dilemma of a Prisoner part 1 (in Tricks)
Posted on 2006-03-30 (17 Comments)
Maybe... by Charlie (2006-03-30 09:22:52)
Difficulty: 3 of 5Under Pythagorean Chain (in Shapes)
Posted on 2006-03-20 (19 Comments)
Some Thoughts re: Is 10000 too big? by Charlie (2006-03-21 10:47:38)
re: Is 10000 too big? by Charlie (2006-03-21 09:17:16)
re: Is 10000 too big? by Charlie (2006-03-21 08:57:20)
Some Thoughts computer exploration --- but ... by Charlie (2006-03-20 21:54:20)
No Subject by Charlie (2006-03-20 16:15:15)
re: Solution, perhaps? by Charlie (2006-03-20 13:18:58)
Difficulty: 3 of 5Under Remainder: Part 1 (in Numbers)
Posted on 2006-03-20 (7 Comments)
Solution computer solution for all (spoiler) by Charlie (2006-03-20 11:33:14)
Some Thoughts The easy ones by Charlie (2006-03-20 11:28:32)
Difficulty: 4 of 5Under Semi-Minimalist Painting (in Logic)
Posted on 2006-03-13 (10 Comments)
re: Where is this from? by Charlie (2006-03-17 07:56:25)
Difficulty: 3 of 5Under and (in Word Problems)
Posted on 2006-03-13 (28 Comments)
re: The coordinating conjunctions by Charlie (2006-03-13 11:10:03)
Difficulty: 4 of 5Under Sum to Infinity - 1 (in Sequences)
Posted on 2006-03-11 (13 Comments)
Solution re: solution -- corrected by Charlie (2006-03-11 14:26:55)
re: solution --- seems to be wrong by Charlie (2006-03-11 12:14:46)
Solution solution by Charlie (2006-03-11 09:17:49)
Difficulty: 3 of 5Under Factorial Sequence II (in Just Math)
Posted on 2006-03-10 (4 Comments)
Solution computer solution by Charlie (2006-03-10 13:06:06)
Difficulty: 3 of 5Under Simple Origami? (in Shapes)
Posted on 2006-03-07 (9 Comments)
Solution refining the answer-computer solution by Charlie (2006-03-07 22:52:54)
Difficulty: 4 of 5Under Black and White Solids (in Geometry)
Posted on 2006-03-04 (13 Comments)
#2- octahedron by Charlie (2006-03-04 13:23:38)
Difficulty: 3 of 5Under Factorial sequence (in Just Math)
Posted on 2006-03-02 (2 Comments)
Solution computer exploration by Charlie (2006-03-02 11:19:50)
Difficulty: 3 of 5Under The Gardener and the Cook (in Tricks)
Posted on 2006-03-01 (30 Comments)
re(2): Solution? by Charlie (2006-03-01 15:18:48)
Difficulty: 3 of 5Under Japanese village (in Science)
Posted on 2006-03-01 (7 Comments)
re(4): solution amendment by Charlie (2006-03-02 08:41:29)
re(2): solution by Charlie (2006-03-01 14:22:54)
Some Thoughts The only problem is ... by Charlie (2006-03-01 11:29:41)
Solution solution by Charlie (2006-03-01 11:07:31)
Difficulty: 3 of 5Under Inversion Distance (in Geometry)
Posted on 2006-02-21 (32 Comments)
Some Thoughts problem by Charlie (2006-02-22 10:25:11)
Difficulty: 3 of 5Under Gross Division (in Numbers)
Posted on 2006-02-20 (16 Comments)
re: computer solution revisited by Charlie (2021-12-04 08:22:28)
Solution computer solution by Charlie (2006-02-20 17:35:30)
re: start by Charlie (2006-02-20 10:34:58)
Some Thoughts start by Charlie (2006-02-20 10:32:24)
Difficulty: 3 of 5Under I win! (in Cryptography)
Posted on 2006-02-20 (6 Comments)
Solution solution by Charlie (2006-02-20 10:16:39)
Difficulty: 3 of 5Under Making poverty history (in Numbers)
Posted on 2006-02-19 (10 Comments)
re(4): computer solution by Charlie (2006-02-19 15:39:45)
re(2): computer solution by Charlie (2006-02-19 15:20:36)
Solution computer solution by Charlie (2006-02-19 12:31:52)
Difficulty: 3 of 5Under The Infinite Drive (in Science)
Posted on 2006-02-18 (5 Comments)
re(2): solution question by Charlie (2006-02-19 10:10:48)
Solution solution by Charlie (2006-02-18 17:51:00)
Difficulty: 3 of 5Under Expect the unexpected (in Paradoxes)
Posted on 2006-02-15 (32 Comments)
Some Thoughts more thoughts on the subject by Charlie (2006-02-20 14:07:28)
Difficulty: 3 of 5Under Spotty editing (in Probability)
Posted on 2006-02-14 (13 Comments)
re: The answer is . . . by Charlie (2006-02-14 14:47:54)
Solution Assuming that ... by Charlie (2006-02-14 14:44:47)
Difficulty: 3 of 5Under To and Fro (in Cryptography)
Posted on 2006-02-13 (7 Comments)
re(2): decryption ... spoiler ... and a question by Charlie (2006-02-14 15:45:44)
Question decryption ... spoiler ... and a question by Charlie (2006-02-14 09:23:25)
Difficulty: 4 of 5Under Bouncy Bouncy part 2 (in Calculus)
Posted on 2006-02-10 (15 Comments)
re(3): solution -- barring any mistakes along the way by Charlie (2006-02-12 10:14:53)
Solution solution -- barring any mistakes along the way by Charlie (2006-02-11 15:48:10)
Some Thoughts re(2): potential path (spoiler) by Charlie (2006-02-11 00:48:46)
Difficulty: 1 of 5Under Three in a Row (in Word Problems)
Posted on 2006-02-09 (11 Comments)
my word list lists by Charlie (2006-02-09 14:29:03)
Difficulty: 2 of 5Under Bouncy Bouncy Part 1 (in Geometry)
Posted on 2006-02-08 (11 Comments)
Solution re(2): solution start by Charlie (2006-02-08 10:31:00)
Difficulty: 4 of 5Under covert western union (in Cryptography)
Posted on 2006-02-07 (6 Comments)
re: Ten out of eleven ain't bad by Charlie (2006-02-07 11:05:40)
Hints/Tips The easy part--partial spoiler by Charlie (2006-02-07 11:01:33)
Difficulty: 2 of 5Under Scrabble® Scramble (in Games)
Posted on 2006-02-03 (8 Comments)
Solution from my word list -- computer solution by Charlie (2006-02-03 11:36:00)
Difficulty: 3 of 5Under The Descending Integers (in Just Math)
Posted on 2006-02-02 (8 Comments)
Solution re: solution -- computer confirmation by Charlie (2006-02-02 12:45:28)
Solution solution by Charlie (2006-02-02 12:23:32)
Difficulty: 3 of 5Under Dafoe, The Lone Entrepreneur (in Just Math)
Posted on 2006-01-30 (23 Comments)
re: These computer solutions... by Charlie (2006-02-01 09:40:37)
Solution another computer solution by Charlie (2006-01-31 14:34:59)
Some Thoughts re: computer solution--manual tweaking by Charlie (2006-01-31 10:02:19)
Some Thoughts computer solution--not necessarily best by Charlie (2006-01-31 09:31:54)
Difficulty: 4 of 5Under I See No More Ships (in Geometry)
Posted on 2006-01-29 (5 Comments)
re(2): discussion by Charlie (2006-01-30 09:25:45)
Solution discussion by Charlie (2006-01-29 15:18:13)
Difficulty: 2 of 5Under Clueless crossword (in Word Problems)
Posted on 2006-01-25 (5 Comments)
re: Who's clueless? (Solution) by Charlie (2006-01-25 10:48:29)
Difficulty: 2 of 5Under Match The Years (in General)
Posted on 2006-01-22 (16 Comments)
re: A solution by Charlie (2006-01-24 09:42:48)
Solution re: Analytic solution with computer verification by Charlie (2006-01-23 08:24:42)
re: 1776 by Charlie (2006-01-22 17:54:49)
Solution re: Analytical solution -- the x-values by Charlie (2006-01-22 17:13:36)
Solution Analytic solution with computer verification by Charlie (2006-01-22 16:28:11)
Difficulty: 3 of 5Under Evil math (in Just Math)
Posted on 2006-01-21 (12 Comments)
Solution computer results by Charlie (2006-01-21 19:06:17)
Difficulty: 3 of 5Under Odometer Sum of the Digits (in Numbers)
Posted on 2006-01-19 (11 Comments)
re(3): computer solution by Charlie (2006-01-20 09:01:40)
re(2): computer solution by Charlie (2006-01-20 08:52:49)
Solution computer solution by Charlie (2006-01-19 15:02:44)
Difficulty: 4 of 5Under A cute little angle to find (in Geometry)
Posted on 2006-01-18 (7 Comments)
re: Solution by Charlie (2006-01-19 09:11:10)
Difficulty: 3 of 5Under Sabbath observance (in Riddles)
Posted on 2006-01-17 (17 Comments)
Some Thoughts faint idea by Charlie (2006-01-18 09:00:20)
Difficulty: 4 of 5Under D on its side (in Shapes)
Posted on 2006-01-16 (14 Comments)
re: Solution by Charlie (2006-01-17 10:35:03)
re: Solution by Charlie (2006-01-17 10:07:25)
Difficulty: 2 of 5Under An equation with consecutive primes (in Just Math)
Posted on 2006-01-16 (23 Comments)
re(5): For those who wanna try by Charlie (2006-01-17 09:10:08)
Solution computer solution -- spoiler by Charlie (2006-01-16 09:40:56)
Difficulty: 2 of 5Under Circle's Limit (in Calculus)
Posted on 2006-01-13 (4 Comments)
Solution solution by Charlie (2006-01-13 11:05:37)
Difficulty: 2 of 5Under Crossed sums (in Just Math)
Posted on 2006-01-12 (12 Comments)
re(2): One or two typos by Charlie (2006-01-14 15:29:41)
Difficulty: 2 of 5Under S-2-1-3-1-2-S (in Word Problems)
Posted on 2006-01-09 (11 Comments)
Solution the computer finds by Charlie (2006-01-09 12:46:07)
Difficulty: 2 of 5Under Two spheres in a tank (in Science)
Posted on 2006-01-05 (11 Comments)
according to Einstein by Charlie (2006-01-05 13:25:03)
Difficulty: 3 of 5Under F-A-C-E (in Word Problems)
Posted on 2006-01-04 (8 Comments)
re: making a flash piano by Charlie (2006-01-05 13:56:22)
re: making a flash piano -- 133 words by Charlie (2006-01-05 09:48:40)
7 & 8 letter words on my word list by Charlie (2006-01-04 12:11:20)
Difficulty: 3 of 5Under Two Logicians, Four Numbers (in Logic)
Posted on 2006-01-03 (14 Comments)
Solution Don't know how to do this with a spreadsheet, but... by Charlie (2006-01-03 20:59:28)
Difficulty: 2 of 5Under Triangle Donut (in Shapes)
Posted on 2006-01-01 (14 Comments)
Solution My interpretation by Charlie (2006-01-01 12:53:42)
Difficulty: 2 of 5Under A rational cryptarithm (in Just Math)
Posted on 2005-12-29 (18 Comments)
re: One Possible Solution by Charlie (2006-01-01 12:55:38)
Difficulty: 3 of 5Under The Longest Drive (in Science)
Posted on 2005-12-26 (17 Comments)
re: Not a rocket scientist but... by Charlie (2005-12-28 13:41:32)
re(2): Yes, in two steps. by Charlie (2005-12-27 18:39:00)
re: One Opinion by Charlie (2005-12-26 15:38:26)
Difficulty: 3 of 5Under The George and Stella Saga (in General)
Posted on 2005-12-26 (11 Comments)
Question re: Solution by Charlie (2005-12-26 15:24:42)
Solution The way I figure it (solution) by Charlie (2005-12-26 15:16:55)
Difficulty: 4 of 5Under Twisted regions (in General)
Posted on 2005-12-22 (9 Comments)
re: One solution (link to solution). by Charlie (2005-12-22 14:36:28)
Difficulty: 4 of 5Under Evaluate this sum (in Just Math)
Posted on 2005-12-21 (15 Comments)
re(2): Using Charlie's idea (spoiler?) -- numerical verification by Charlie (2005-12-21 16:18:45)
re: Using Charlie's idea (spoiler?) by Charlie (2005-12-21 15:54:00)
Some Thoughts ideas by Charlie (2005-12-21 12:17:26)
Difficulty: 2 of 5Under The hired man (in Logic)
Posted on 2005-12-19 (20 Comments)
Solution Computer Solution -- spoiler by Charlie (2005-12-19 14:16:30)
Difficulty: 2 of 5Under No Fault Coverage (in Shapes)
Posted on 2005-12-18 (2 Comments)
Solution Well, here's one way by Charlie (2005-12-18 17:02:55)
Difficulty: 2 of 5Under Quad Angle (in Geometry)
Posted on 2005-12-17 (3 Comments)
re: Solution? Spoiler? by Charlie (2005-12-17 19:05:33)
Difficulty: 5 of 5Under A Self Intersecting Curve (in Calculus)
Posted on 2005-12-16 (9 Comments)
Another numerical method as solution by Charlie (2005-12-17 11:33:49)
Difficulty: 1 of 5Under What number? (in Tricks)
Posted on 2005-12-16 (6 Comments)
Solution two possibilities--spoiler by Charlie (2005-12-16 09:57:05)
Difficulty: 3 of 5Under The Law of Sines (in Geometry)
Posted on 2005-12-13 (5 Comments)
Solution re: quick guess -- proof by Charlie (2005-12-13 12:02:42)
Difficulty: 2 of 5Under Colored Blocks (in Shapes)
Posted on 2005-12-12 (6 Comments)
Solution re: ideas solution of 3x3x3 by Charlie (2005-12-12 14:31:17)
Some Thoughts ideas by Charlie (2005-12-12 13:53:02)
Difficulty: 2 of 5Under Nine square pieces (in General)
Posted on 2005-12-11 (9 Comments)
re(3): For those who wanna try... random sampling ... computer used by Charlie (2005-12-12 16:17:23)
re: For those who can try... random sampling ... computer used by Charlie (2005-12-12 15:35:36)
Solution Both (all) solutions -- computer used -- spoiler by Charlie (2005-12-11 19:25:20)
Difficulty: 4 of 5Under Balls in Space (in Geometry)
Posted on 2005-12-09 (12 Comments)
Solution a derivation by Charlie (2005-12-09 16:43:37)
Difficulty: 5 of 5Under Conference Time (in General)
Posted on 2005-12-09 (8 Comments)
re(2): computer solution-spoiler by Charlie (2005-12-09 21:54:58)
Solution computer solution-spoiler by Charlie (2005-12-09 13:00:24)
Question re: Conference Time by Charlie (2005-12-09 09:30:15)
Difficulty: 5 of 5Under Boiling Impossibilities (in Science)
Posted on 2005-12-06 (41 Comments)
re: so far no good by Charlie (2005-12-06 11:05:06)
Difficulty: 2 of 5Under Solid triangles (2) (in Shapes)
Posted on 2005-12-05 (7 Comments)
re(2): part 1 spoiler by Charlie (2005-12-06 10:14:33)
re(2): part 1 spoiler by Charlie (2005-12-06 09:27:16)
part 2--the octahedron--spoiler. by Charlie (2005-12-05 09:53:27)
part 1 spoiler by Charlie (2005-12-05 09:37:06)
Difficulty: 1 of 5Under How can this be? (in Riddles)
Posted on 2005-12-04 (5 Comments)
re: Solution by Charlie (2005-12-04 22:45:26)
Difficulty: 4 of 5Under Spinning disks (in Shapes)
Posted on 2005-12-03 (6 Comments)
re: Solution by Charlie (2005-12-04 11:12:01)
Difficulty: 2 of 5Under Please, Mr. Postman (in Cryptography)
Posted on 2005-12-02 (18 Comments)
idea by Charlie (2005-12-02 21:43:01)
Difficulty: 1 of 5Under Add a third (in Word Problems)
Posted on 2005-12-02 (24 Comments)
re: ILTW - answer from the www by Charlie (2005-12-02 10:44:30)
Solution from the word list by Charlie (2005-12-02 10:11:29)
Difficulty: 4 of 5Under Easily distinguished codes (in Numbers)
Posted on 2005-11-29 (11 Comments)
re: Spoiler by Charlie (2005-11-29 14:11:02)
Difficulty: 3 of 5Under Winning The Regatta (in Probability)
Posted on 2005-11-28 (6 Comments)
re: Charlie I wonder... by Charlie (2005-12-04 11:19:41)
Solution 2-7 races exactly; simulation above by Charlie (2005-11-28 10:58:21)
Difficulty: 2 of 5Under Magic Cubic (in Just Math)
Posted on 2005-11-28 (15 Comments)
re(2): 144 solutions to this problem -- all 6 in 3-D by Charlie (2007-11-29 15:35:49)
re: 144 solutions to this problem by Charlie (2007-11-29 10:32:39)
re: My solution (Spoiler) by Charlie (2005-11-28 09:25:49)
Difficulty: 3 of 5Under Cylindrical Slice (in Calculus)
Posted on 2005-11-25 (14 Comments)
Solution single integral by Charlie (2005-11-25 11:56:00)
Difficulty: 2 of 5Under Reproduce this drawing (in General)
Posted on 2005-11-25 (34 Comments)
re(8): No Subject by Charlie (2005-11-25 12:10:13)
re(6): No Subject by Charlie (2005-11-25 10:53:14)
Difficulty: 4 of 5Under Six Squares (in Numbers)
Posted on 2005-11-18 (3 Comments)
re: Smaller solution -- minimality confirmed by computer by Charlie (2005-11-20 12:38:57)
Difficulty: 2 of 5Under Similar Six Sequence (in Numbers)
Posted on 2005-11-18 (20 Comments)
re(5): solution - spoiler by Charlie (2005-11-18 11:26:33)
Solution computer solution by Charlie (2005-11-18 11:05:35)
re(3): solution - spoiler by Charlie (2005-11-18 11:01:56)
Question re: solution - spoiler by Charlie (2005-11-18 10:25:46)
Difficulty: 4 of 5Under Box bounce (in Geometry)
Posted on 2005-11-17 (26 Comments)
Solution Solution of space version. by Charlie (2005-11-17 14:57:22)
Difficulty: 3 of 5Under Challenging Chess Championship (in Games)
Posted on 2005-11-16 (13 Comments)
re(2): What am I missing? (spoilers) by Charlie (2005-11-16 14:57:54)
Difficulty: 3 of 5Under Connect the planets (in General)
Posted on 2005-11-16 (10 Comments)
Solution my method by Charlie (2005-11-16 10:21:05)
Difficulty: 4 of 5Under Strange sequence (in Calculus)
Posted on 2005-11-15 (9 Comments)
re: solution - no computer by Charlie (2005-11-15 14:25:49)
Solution Solution--computer used thrice... by Charlie (2005-11-15 11:46:21)
Difficulty: 2 of 5Under Only 6´s and 9´s (in General)
Posted on 2005-11-14 (8 Comments)
Solution computer solution by Charlie (2005-11-14 13:33:32)
re: Clarification by Charlie (2005-11-14 09:33:26)
Difficulty: 2 of 5Under Covering a chessboard (in Logic)
Posted on 2005-11-12 (15 Comments)
re: Count the Ways by Charlie (2005-11-14 08:24:58)
re: Count the Ways by Charlie (2005-11-13 19:22:35)
Solution Count the Ways by Charlie (2005-11-13 19:18:14)
Solution solution by Charlie (2005-11-12 13:53:23)
Difficulty: 4 of 5Under 100 Chords (in Geometry)
Posted on 2005-11-11 (10 Comments)
re: Solution? Spoiler? by Charlie (2005-11-12 10:48:32)
Difficulty: 3 of 5Under Find these constants I (in Just Math)
Posted on 2005-11-10 (11 Comments)
Solution computer soln--spoiler--don't let this inhibit you from seeking analytic soln by Charlie (2005-11-10 16:09:58)
Difficulty: 2 of 5Under Find just one digit (in Numbers)
Posted on 2005-11-10 (13 Comments)
Solution Another method. by Charlie (2005-11-10 09:37:55)
Difficulty: 2 of 5Under Microwave Math (in Just Math)
Posted on 2005-11-08 (8 Comments)
re: And the winning number is... by Charlie (2005-11-08 11:29:30)
Solution computer solution by Charlie (2005-11-08 11:01:51)
Difficulty: 1 of 5Under Trigonometry Nest 2 (in Just Math)
Posted on 2005-11-07 (7 Comments)
re: Thoughts and Possible Solution by Charlie (2005-11-08 15:57:17)
some thoughts--spoiler present by Charlie (2005-11-07 10:49:43)
Solution To greater precision by Charlie (2005-11-07 10:37:33)
Difficulty: 3 of 5Under Teamwork:Pick and Shake (in General)
Posted on 2005-11-04 (3 Comments)
Solution Excel solution by Charlie (2005-11-04 11:58:21)
Difficulty: 2 of 5Under Binary Crossnumber Puzzle - 01 (in General)
Posted on 2005-11-03 (10 Comments)
re: a trick? by Charlie (2005-11-08 16:01:28)
Difficulty: 3 of 5Under Palindromic sequences (in Sequences)
Posted on 2005-10-31 (16 Comments)
Some Thoughts This works, but is it what Bob had in mind (don't know if spoiler) by Charlie (2005-10-31 13:49:37)
Difficulty: 2 of 5Under What´s your score II? (in General)
Posted on 2005-10-31 (26 Comments)
How high can it go? by Charlie (2005-10-31 11:08:09)
Hints/Tips numbers in decreasing order of total digits--may help by Charlie (2005-10-31 10:57:54)
Difficulty: 3 of 5Under The undiscovered numbers (in Logic)
Posted on 2005-10-29 (32 Comments)
re(3): almost a proof by Charlie (2005-10-30 19:51:55)
re: almost a proof by Charlie (2005-10-30 12:57:55)
Difficulty: 4 of 5Under Zero to 100 with 12345 (in Just Math)
Posted on 2005-10-29 (7 Comments)
re(3): computer solution -- minimum use of factorial by Charlie (2005-11-02 08:40:11)
Solution computer solution -- minimum use of factorial by Charlie (2005-10-29 14:02:18)
Difficulty: 2 of 5Under An infinite chessboard (in Just Math)
Posted on 2005-10-28 (27 Comments)
re: Question by Charlie (2005-10-29 16:48:48)
re: bitwise XOR by Charlie (2005-10-29 09:38:27)
re(3): About XOR - only to by Charlie (2005-10-29 09:35:02)
re: About XOR - only to by Charlie (2005-10-28 23:52:30)
re: answer by Charlie (2005-10-28 14:49:56)
Solution re: neat -- and the snake returns by Charlie (2005-10-28 14:44:51)
Difficulty: 2 of 5Under Count the ways... (in Shapes)
Posted on 2005-10-28 (7 Comments)
Solution re: computer solution -- now checking rotations and reflections by Charlie (2005-10-28 12:19:06)
Solution computer solution by Charlie (2005-10-28 10:27:06)
Difficulty: 3 of 5Under Morse Code Puzzle (in General)
Posted on 2005-10-27 (6 Comments)
Solution computer solution by Charlie (2005-10-27 16:06:14)
Some Thoughts One of them by Charlie (2005-10-27 14:06:39)
Difficulty: 1 of 5Under Möbius chess (in Games)
Posted on 2005-10-27 (7 Comments)
Solution re(2): Solution by Charlie (2005-10-27 11:18:09)
Difficulty: 4 of 5Under Fade sequence (in Sequences)
Posted on 2005-10-26 (5 Comments)
re: a solution by Charlie (2005-10-26 14:23:00)
Difficulty: 3 of 5Under Dividing A Grid (in Numbers)
Posted on 2005-10-25 (10 Comments)
Hints/Tips possible subsets by Charlie (2005-10-25 11:48:45)
Difficulty: 2 of 5Under Calm down, people! (in Logic)
Posted on 2005-10-25 (45 Comments)
re: No Solution Yet? by Charlie (2005-10-29 17:35:45)
Solution re: Re: Charlies computer solution by Charlie (2005-10-29 17:28:54)
Solution computer solution (spoiler) by Charlie (2005-10-25 11:16:24)
Difficulty: 4 of 5Under Measure that angle V (in Geometry)
Posted on 2005-10-24 (8 Comments)
Solution re: solution -- closed form by Charlie (2005-10-24 15:18:40)
Solution solution by Charlie (2005-10-24 13:54:11)
re: SO WHAT- spoiler by Charlie (2005-10-24 13:50:04)
Difficulty: 3 of 5Under 2nd difference sequence (in Sequences)
Posted on 2005-10-22 (11 Comments)
Some Thoughts Hmmm... (technical solution to part one, but probably not the one in mind) by Charlie (2005-10-23 14:13:25)
Difficulty: 2 of 5Under XOR (in Cryptography)
Posted on 2005-10-22 (27 Comments)
re: Duped! - Which Ten Letters? by Charlie (2005-10-29 10:00:59)
re: I think I got it by Charlie (2005-10-27 13:36:21)
re(3): Plenty of answers (?) -- well, here are your choices by Charlie (2005-10-25 21:26:15)
re(2): Plenty of answers (?) -- well, here are your choices by Charlie (2005-10-25 21:06:03)
Solution Pun doesn't have 10 letters. by Charlie (2005-10-23 01:19:58)
Hints/Tips Ahhh! -- decryption by Charlie (2005-10-22 19:02:46)
None of these seem to work by Charlie (2005-10-22 11:00:03)
Difficulty: 3 of 5Under Covering A Circle (in Shapes)
Posted on 2005-10-21 (12 Comments)
re(3): overlap solution by Charlie (2005-10-21 22:45:26)
Solution re(2): overlap solution by Charlie (2005-10-21 17:08:12)
re(2): overlap solution by Charlie (2005-10-21 16:11:25)
Difficulty: 4 of 5Under Diagonal Product (in Just Math)
Posted on 2005-10-20 (4 Comments)
Some Thoughts Thoughts toward a proof by Charlie (2005-10-20 14:21:02)
Hints/Tips No proof, but ... (spoiler) by Charlie (2005-10-20 13:54:01)
Difficulty: 2 of 5Under The omitted age (in Logic)
Posted on 2005-10-20 (21 Comments)
Solution a program which gives the result is (soln repeated) by Charlie (2005-10-20 22:54:40)
Difficulty: 3 of 5Under Isosceles Right Triangles (in Geometry)
Posted on 2005-10-19 (10 Comments)
re(3): Parting shot by Charlie (2005-10-27 14:04:30)
re: Parting shot by Charlie (2005-10-26 14:55:59)
re: Analytic solution -- typos by Charlie (2005-10-19 14:02:19)
Difficulty: 3 of 5Under And the clock goes round. (in General)
Posted on 2005-10-17 (1 Comments)
Solution solution by Charlie (2005-10-17 10:38:14)
Difficulty: 3 of 5Under A Perplexing Expression (in Just Math)
Posted on 2005-10-14 (18 Comments)
so again--the rules by Charlie (2005-10-15 15:21:50)
re(4): perhaps? -- spoiler perhaps. by Charlie (2005-10-14 21:22:16)
re(2): perhaps? -- spoiler perhaps. by Charlie (2005-10-14 21:10:53)
Difficulty: 2 of 5Under Nine cards (in Logic)
Posted on 2005-10-14 (31 Comments)
re: No Subject by Charlie (2005-10-15 03:27:46)
computer logic by Charlie (2005-10-14 15:25:20)
Difficulty: 3 of 5Under Spell it out (in Sequences)
Posted on 2005-10-10 (6 Comments)
Solution continuing by Charlie (2005-10-10 17:21:52)
Difficulty: 3 of 5Under Bright Houses (in Logic)
Posted on 2005-10-08 (13 Comments)
Solution computer solution by Charlie (2005-10-09 15:46:16)
Difficulty: 2 of 5Under Two sets of Coins (in Weights and Scales)
Posted on 2005-10-07 (7 Comments)
re: not sure i get your logic for scenario two... by Charlie (2005-10-21 14:01:06)
Solution solution by Charlie (2005-10-07 21:48:39)
Hints/Tips re: 3 simple steps by Charlie (2005-10-07 18:57:24)
Difficulty: 2 of 5Under Six Seven Eight (in Just Math)
Posted on 2005-10-05 (5 Comments)
Solution Computer solution -- spoiler by Charlie (2005-10-05 14:42:32)
Difficulty: 2 of 5Under Twelve what?! (in General)
Posted on 2005-10-04 (24 Comments)
Question re: Hints for (h) and (i) by Charlie (2005-10-08 20:37:10)
c & d same as a? by Charlie (2005-10-04 14:25:25)
Difficulty: 3 of 5Under Crossing the board (in General)
Posted on 2005-09-30 (10 Comments)
Solution re: Minimum solution by Charlie (2005-10-03 20:50:56)
Solution re: Solution by Charlie (2005-10-03 20:27:24)
Solution solution -- computer assisted by Charlie (2005-09-30 21:08:44)
Difficulty: 3 of 5Under Boxing Day (in Numbers)
Posted on 2005-09-28 (7 Comments)
re: allternate solution by Charlie (2005-09-29 13:24:38)
Difficulty: 3 of 5Under ASKY? Code (in Cryptography)
Posted on 2005-09-27 (8 Comments)
Solution Indeed, decryption verified. by Charlie (2005-09-28 20:30:28)
Difficulty: 3 of 5Under Dysfunctional Crossing (in Logic)
Posted on 2005-09-26 (30 Comments)
Solution re(2): Finally--a computer solution--the corrected program by Charlie (2005-09-28 13:54:43)
re: Finally--a computer solution--bug by Charlie (2005-09-28 13:07:17)
Solution Finally--a computer solution by Charlie (2005-09-28 02:24:47)
Difficulty: 3 of 5Under All Four (in Word Problems)
Posted on 2005-09-26 (8 Comments)
Solution another by Charlie (2005-09-26 15:56:23)
Difficulty: 2 of 5Under Closest to pi (in Just Math)
Posted on 2005-09-25 (25 Comments)
re: this one beats them all : less than 10^-9 by Charlie (2005-09-28 15:47:22)
Solution re: My mistake! -- diff. 0.0032837 (from modified computer program) by Charlie (2005-09-26 18:19:29)
Solution .00000026676419 -- computer solution by Charlie (2005-09-26 00:14:36)
Difficulty: 3 of 5Under Self-Referential Numbers (in Numbers)
Posted on 2005-09-23 (19 Comments)
re(3): Attn: Ken Haley by Charlie (2005-09-24 16:06:47)
re(2): Attn: Ken Haley by Charlie (2005-09-24 15:44:53)
re: Solution & method by Charlie (2005-09-23 20:00:41)
Solution computer solution by Charlie (2005-09-23 19:44:37)
Difficulty: 3 of 5Under Star Trek (in General)
Posted on 2005-09-23 (27 Comments)
re(3): ARE YOU GLAD, CHARLIE??? by Charlie (2005-10-02 14:18:22)
Solution re(3): computer solution -- longer paths by Charlie (2005-09-24 19:16:50)
re: ARE YOU GLAD, CHARLIE??? by Charlie (2005-09-24 18:45:44)
re(2): computer solution -- by Charlie (2005-09-24 02:49:42)
re(2): computer solution -- "graphically" displayed by Charlie (2005-09-24 02:40:38)
Solution re: computer solution -- "graphically" displayed by Charlie (2005-09-24 02:38:19)
Solution computer solution by Charlie (2005-09-24 02:29:46)
re: well, it's less than 5 by Charlie (2005-09-23 16:26:03)
re(3): alignment problem--look like this? by Charlie (2005-09-23 16:17:20)
re: alignment problem--look like this? by Charlie (2005-09-23 13:45:47)
alignment problem by Charlie (2005-09-23 13:41:38)
Difficulty: 3 of 5Under Buddy System (in Just Math)
Posted on 2005-09-22 (8 Comments)
Solution solution -- computer assisted by Charlie (2005-09-22 19:25:02)
Difficulty: 2 of 5Under Shorten and halve (in Word Problems)
Posted on 2005-09-21 (33 Comments)
re: Is it by Charlie (2005-09-29 14:19:50)
Difficulty: 2 of 5Under Star of David (in General)
Posted on 2005-09-20 (11 Comments)
Solution re: a solution 12 flips -- the computer solution by Charlie (2005-09-20 18:53:07)
re(3): Accomplishing the goal - WRONG by Charlie (2005-09-20 15:33:23)
Solution re: Accomplishing the goal by Charlie (2005-09-20 14:18:45)
Hints/Tips Accomplishing the goal by Charlie (2005-09-20 13:43:24)
Difficulty: 2 of 5Under The reversed numbers (in Just Math)
Posted on 2005-09-16 (8 Comments)
More brute force by Charlie (2005-09-16 19:38:29)
re: Solution by Charlie (2005-09-16 19:24:34)
Difficulty: 2 of 5Under Try Top Typing! (in Word Problems)
Posted on 2005-09-15 (20 Comments)
re(2): This can't be right... by Charlie (2005-09-15 18:45:01)
From my word list -- computer used by Charlie (2005-09-15 13:05:34)
Difficulty: 3 of 5Under Three Spheres (in Geometry)
Posted on 2005-09-14 (6 Comments)
Solution re: solution -- Table of values by Charlie (2005-09-15 13:59:23)
Solution solution by Charlie (2005-09-14 18:55:04)
Difficulty: 2 of 5Under Double Dates (in General)
Posted on 2005-09-14 (4 Comments)
Solution re(2): Pesky months -- alternative count by Charlie (2005-09-14 14:07:39)
re: Pesky months by Charlie (2005-09-14 14:02:22)
Solution solution by Charlie (2005-09-14 13:43:27)
Difficulty: 3 of 5Under Odd people (in Liars and Knights)
Posted on 2005-09-12 (13 Comments)
re: Lisa's point by Charlie (2005-09-12 17:43:48)
Some Thoughts a solution? by Charlie (2005-09-12 14:27:26)
Difficulty: 1 of 5Under what a riddle!! (in Riddles)
Posted on 2005-09-11 (55 Comments)
Some Thoughts The intended answer... by Charlie (2005-09-12 17:56:45)
Difficulty: 4 of 5Under Recursive Definition (in Numbers)
Posted on 2005-09-09 (8 Comments)
Solution re(2): But can I prove it? -- Visualization-- informal proof by Charlie (2005-09-10 13:35:16)
Some Thoughts Some Numbers by Charlie (2005-09-09 15:07:15)
Difficulty: 3 of 5Under Pumpkins 2 (in Numbers)
Posted on 2005-09-08 (5 Comments)
Solution the Computer way by Charlie (2005-09-08 20:08:23)
Difficulty: 3 of 5Under A Three Way Scale (in Weights and Scales)
Posted on 2005-09-05 (3 Comments)
Question Is 4 weighings possible? by Charlie (2005-09-06 13:48:19)
Difficulty: 4 of 5Under Politically Correct Moduli (in Just Math)
Posted on 2005-09-03 (12 Comments)
Solution bases that work; and those that don't by Charlie (2005-09-03 18:22:16)
Difficulty: 3 of 5Under ABSENT TONE (in Numbers)
Posted on 2005-09-02 (20 Comments)
re(7): Not a Solution by Charlie (2005-09-04 15:51:00)
re(5): Not a Solution by Charlie (2005-09-04 01:29:18)
Hints/Tips Not a Solution by Charlie (2005-09-03 18:37:46)
Difficulty: 3 of 5Under Sorta pythagoric... (in Numbers)
Posted on 2005-09-01 (16 Comments)
Some Thoughts computer search by Charlie (2005-09-02 16:17:57)
Difficulty: 2 of 5Under A string of primes (in Numbers)
Posted on 2005-09-01 (4 Comments)
re: 1820 computer solutions -- the program by Charlie (2005-09-01 14:25:00)
re: 1820 computer solutions by Charlie (2005-09-01 14:20:30)
Solution 1820 computer solutions by Charlie (2005-09-01 14:18:39)
Difficulty: 2 of 5Under Celsius x Fahrenheit (in Just Math)
Posted on 2005-08-31 (9 Comments)
Solution Some Big Numbers -- Computer Solution by Charlie (2005-08-31 19:50:15)
re(2): I think I found one! (I didn't) by Charlie (2005-08-31 19:34:59)
Difficulty: 5 of 5Under Riffling Chance (in Probability)
Posted on 2005-08-30 (10 Comments)
Some Thoughts Simulation by Charlie (2005-08-31 19:21:25)
Difficulty: 3 of 5Under A quadrilateral query (in Geometry)
Posted on 2005-08-29 (6 Comments)
Solution Computer verification of minimum by Charlie (2005-08-29 18:24:32)
Hints/Tips a strategy by Charlie (2005-08-29 16:46:08)
Difficulty: 3 of 5Under A Matter of Perspective (in Geometry)
Posted on 2005-08-27 (10 Comments)
re: Solution by Charlie (2005-08-27 17:35:52)
Difficulty: 3 of 5Under Solid triangles (in Shapes)
Posted on 2005-08-26 (10 Comments)
re(4): part 2 -- spoiler by Charlie (2005-08-28 02:16:37)
re(2): part 2 -- spoiler by Charlie (2005-08-27 20:30:31)
Some Thoughts The sizes of the triangles by Charlie (2005-08-27 13:25:52)
Some Thoughts part 2 -- spoiler by Charlie (2005-08-26 18:44:37)
Some Thoughts part 1 -- spoiler by Charlie (2005-08-26 18:13:54)
Difficulty: 3 of 5Under Variation on a Classic (in Geometry)
Posted on 2005-08-23 (13 Comments)
re(2): According to Geometer's Sketchpad... (spoiler) by Charlie (2005-08-23 20:22:30)
re(2): According to Geometer's Sketchpad... (spoiler) by Charlie (2005-08-23 20:19:18)
re: According to Geometer's Sketchpad... (spoiler) by Charlie (2005-08-23 18:42:00)
According to Geometer's Sketchpad... (spoiler) by Charlie (2005-08-23 18:24:42)
Difficulty: 2 of 5Under The folly of war part 1: Knights (in Probability)
Posted on 2005-08-23 (24 Comments)
re: Full generalised derivation by Charlie (2005-08-28 17:42:36)
re: Full manual solution (most probable) by Charlie (2005-08-24 13:43:13)
Solution To be more exact. Analogy to smaller case. by Charlie (2005-08-23 14:02:54)
Difficulty: 3 of 5Under Triangles and Rectangle (in Geometry)
Posted on 2005-08-21 (6 Comments)
re: Answer by Charlie (2005-08-22 12:30:22)
Difficulty: 2 of 5Under Digital sum (in Just Math)
Posted on 2005-08-20 (8 Comments)
Some Thoughts Looks suspiciously close to ... by Charlie (2005-08-20 18:54:22)
Difficulty: 4 of 5Under The late eight sequences (in Sequences)
Posted on 2005-08-19 (17 Comments)
re: No Subject by Charlie (2005-08-19 20:45:43)
Difficulty: 2 of 5Under The 5 jugs (in General)
Posted on 2005-08-18 (36 Comments)
re: symetrical bottles by Charlie (2005-08-19 14:59:59)
Solution All the minimal solutions by Charlie (2005-08-18 18:12:35)
Solution re(2): Solution (spoilers present--computer solutions) by Charlie (2005-08-18 16:17:27)
re: Solution by Charlie (2005-08-18 15:35:08)
Difficulty: 4 of 5Under Synograms (in Word Problems)
Posted on 2005-08-17 (14 Comments)
Jug capacities by Charlie (2005-08-20 19:04:46)
Difficulty: 1 of 5Under Needle in a Haystack (in General)
Posted on 2005-08-17 (13 Comments)
Solution re: Another one... (computer solution) by Charlie (2005-08-17 15:33:32)
Difficulty: 3 of 5Under The failing LEDs (in Just Math)
Posted on 2005-08-09 (12 Comments)
Question can we assume by Charlie (2005-08-09 20:03:41)
Difficulty: 1 of 5Under How Long 'til Morning? (in General)
Posted on 2005-08-09 (22 Comments)
re: No Subject by Charlie (2005-08-09 13:28:08)
Difficulty: 2 of 5Under How Fast?!? (in Just Math)
Posted on 2005-08-08 (7 Comments)
Solution Max velocity by Charlie (2005-08-08 14:07:32)
Solution Another way of saying it. by Charlie (2005-08-08 13:49:38)
Difficulty: 3 of 5Under Tackle These Three Tests (in General)
Posted on 2005-08-07 (9 Comments)
Solution Solution assuming that Albert is Arthur's real name... by Charlie (2005-08-07 03:37:50)
Difficulty: 2 of 5Under The Remaining Digits (in Logic)
Posted on 2005-08-04 (21 Comments)
Solution re(3): George's answer by Charlie (2005-08-04 18:15:04)
re: George's answer by Charlie (2005-08-04 18:05:10)
Difficulty: 2 of 5Under Lively (in Riddles)
Posted on 2005-08-03 (41 Comments)
Some Thoughts Still Another Guess by Charlie (2005-08-03 13:01:51)
Difficulty: 3 of 5Under Pair Playing Probability (in Probability)
Posted on 2005-08-02 (32 Comments)
Solution The full tournament by Charlie (2005-08-02 19:05:57)
re: I undestood right? by Charlie (2005-08-02 15:11:25)
Difficulty: 2 of 5Under Complete the crossword (in Word Problems)
Posted on 2005-08-01 (14 Comments)
Solution re(2): Got it! - Not yet! by Charlie (2005-08-02 18:49:45)
Difficulty: 2 of 5Under What´s your score? (in Games)
Posted on 2005-07-30 (39 Comments)
re(5): First target by Charlie (2005-07-31 21:38:42)
Question re(3): First target by Charlie (2005-07-31 16:53:43)
Difficulty: 5 of 5Under Circle (in Geometry)
Posted on 2005-07-28 (6 Comments)
Hints/Tips Thoughts by Charlie (2005-07-28 19:41:13)
Difficulty: 3 of 5Under Cutting Cubic Corners (in Geometry)
Posted on 2005-07-27 (5 Comments)
Solution Pencil and Paper used ... by Charlie (2005-07-27 20:42:16)
Difficulty: 2 of 5Under Ripley's IQ Game (in Games)
Posted on 2005-07-23 (17 Comments)
re(2): solution by Charlie (2005-07-28 13:28:11)
re: Possible ending squares by Charlie (2005-07-24 20:12:59)
Solution There are ... by Charlie (2005-07-23 19:25:44)
Difficulty: 3 of 5Under Up or down or... (in Science)
Posted on 2005-07-22 (20 Comments)
re(2): I think... by Charlie (2005-07-22 17:45:45)
Some Thoughts I think... by Charlie (2005-07-22 15:23:42)
Difficulty: 2 of 5Under Thirds and Differences (in Numbers)
Posted on 2005-07-21 (12 Comments)
Solution How about ... by Charlie (2005-07-21 16:15:01)
Difficulty: 2 of 5Under Splitting words (in Word Problems)
Posted on 2005-07-21 (14 Comments)
Solution better solution by Charlie (2023-09-25 16:28:14)
Solution computer solution by Charlie (2005-07-21 13:21:23)
Difficulty: 3 of 5Under Tough Isosceles (in Geometry)
Posted on 2005-07-20 (6 Comments)
Solution solution by Charlie (2005-07-20 18:56:12)
Hints/Tips Playing around with Geometer's Sketchpad.... by Charlie (2005-07-20 15:50:33)
Difficulty: 3 of 5Under Prime square (in Numbers)
Posted on 2005-07-19 (10 Comments)
Part Two -- a solution at random by Charlie (2005-07-19 16:06:30)
Part One -- a solution at random by Charlie (2005-07-19 15:48:51)
Difficulty: 3 of 5Under No Incest, Please (in General)
Posted on 2005-07-18 (14 Comments)
Solution computer solution by Charlie (2005-07-18 18:23:33)
Difficulty: 1 of 5Under Close to a million (in General)
Posted on 2005-07-18 (12 Comments)
Solution computer soln -- spoiler by Charlie (2005-07-18 04:48:30)
Difficulty: 3 of 5Under Dishonest Strategy (in Probability)
Posted on 2005-07-16 (18 Comments)
re: less than 100% by Charlie (2005-07-16 18:04:41)
Difficulty: 3 of 5Under Word2Num (in Cryptography)
Posted on 2005-07-15 (9 Comments)
Solution re: Procedure still eludes... (hint) by Charlie (2005-07-16 18:09:07)
Difficulty: 2 of 5Under Only 3 lines? (in Geometry)
Posted on 2005-07-14 (12 Comments)
Solution re: One way -- some numbers by Charlie (2005-07-14 19:08:24)
Difficulty: 3 of 5Under 8 8s (in Numbers)
Posted on 2005-07-11 (24 Comments)
re: 2 solutions by Charlie (2005-07-22 17:48:36)
Solution Computer generated solutions by Charlie (2005-07-12 18:58:03)
Solution some solutions by Charlie (2005-07-12 03:12:24)
Difficulty: 4 of 5Under Square Power (in Numbers)
Posted on 2005-07-10 (7 Comments)
Hints/Tips possible starts by Charlie (2005-07-10 15:49:50)
Difficulty: 2 of 5Under Oodles of Factors (in Just Math)
Posted on 2005-07-08 (8 Comments)
computer exhaustive search by Charlie (2005-07-08 20:34:02)
Solution re: No Subject by Charlie (2005-07-08 19:26:44)
Hints/Tips No Subject by Charlie (2005-07-08 16:20:59)
Difficulty: 3 of 5Under From a Balloon (in Science)
Posted on 2005-07-07 (36 Comments)
re: long live Corialis by Charlie (2005-07-10 16:05:18)
Solution re: My thoughts by Charlie (2005-07-07 20:25:59)
Difficulty: 2 of 5Under 123456 (in Numbers)
Posted on 2005-07-04 (21 Comments)
re(2): Trial and Error by Charlie (2005-07-05 13:30:19)
Trial and Error by Charlie (2005-07-04 18:47:29)
Difficulty: 3 of 5Under A digital arrangement (in Just Math)
Posted on 2005-06-30 (21 Comments)
re: Try a notation structure by Charlie (2005-07-02 04:36:09)
re: A solution and question by Charlie (2005-06-30 20:40:36)
Difficulty: 3 of 5Under Many Marbles Mystery (in Geometry)
Posted on 2005-06-29 (5 Comments)
Solution The basic question. by Charlie (2005-06-29 20:48:40)
Difficulty: 1 of 5Under Yeah, yeah, yeah -- aye? (in General)
Posted on 2005-06-29 (8 Comments)
re(2): Answer by Charlie (2005-06-29 13:25:01)
Difficulty: 2 of 5Under Digit Sequence (in Sequences)
Posted on 2005-06-28 (16 Comments)
Order out of chaos -- tracing back by Charlie (2005-06-29 15:22:40)
re: Theoretically (growing vs. shrinking patterns) by Charlie (2005-06-28 19:46:58)
Hints/Tips re: First 20,001 digits by Charlie (2005-06-28 13:41:15)
Hints/Tips First 20,001 digits by Charlie (2005-06-28 13:33:23)
Difficulty: 3 of 5Under Special Similar Set (in Weights and Scales)
Posted on 2005-06-27 (11 Comments)
Solution Part one solution (and part 2) by Charlie (2005-06-27 18:46:19)
Difficulty: 1 of 5Under My clever father (in Tricks)
Posted on 2005-06-24 (14 Comments)
another possibility by Charlie (2005-06-24 13:20:27)
Difficulty: 2 of 5Under Three Tests, Take Three! (in Weights and Scales)
Posted on 2005-06-23 (15 Comments)
re(2): The answer is ... by Charlie (2005-06-24 01:44:35)
Solution The answer is ... by Charlie (2005-06-23 12:56:03)
Difficulty: 3 of 5Under A classic game (in Numbers)
Posted on 2005-06-22 (10 Comments)
Solution re: Charlie and Federico Kereki.... by Charlie (2005-06-23 14:07:20)
Solution re: Answer by Charlie (2005-06-22 19:27:44)
Difficulty: 2 of 5Under Who is not rich? (in Logic)
Posted on 2005-06-22 (24 Comments)
Solution solution by Charlie (2005-06-22 13:43:19)
Difficulty: 1 of 5Under Even, or Odd? (in Sequences)
Posted on 2005-06-20 (15 Comments)
Question re: Spoiler by Charlie (2005-06-20 15:31:17)
Difficulty: 1 of 5Under What time is it again? (in General)
Posted on 2005-06-19 (8 Comments)
Solution trial and (no) error - computer solution by Charlie (2005-06-19 15:36:59)
Difficulty: 3 of 5Under L.A. to Hawaii (in Science)
Posted on 2005-06-17 (11 Comments)
re: Answer by Charlie (2009-02-17 11:20:43)
Difficulty: 1 of 5Under 'Twas whispered in heaven (in Famous Riddles)
Posted on 2005-06-17 (14 Comments)
re: if you allow me to say... by Charlie (2005-06-17 13:44:22)
Difficulty: 1 of 5Under Complete the grid (in Word Problems)
Posted on 2005-06-16 (49 Comments)
Question re: Solution -- Spoiler by Charlie (2005-06-18 15:01:59)
Difficulty: 2 of 5Under 2n+1 Statements (in Logic)
Posted on 2005-06-13 (15 Comments)
Some Thoughts Hypothesis by Charlie (2005-06-13 19:06:12)
Difficulty: 2 of 5Under p(p(x)) (in Sequences)
Posted on 2005-06-11 (8 Comments)
Solution very short computer program by Charlie (2009-02-23 16:47:45)
Difficulty: 3 of 5Under Dotty Right Triangle (in Numbers)
Posted on 2005-06-09 (6 Comments)
re: Solution by Charlie (2005-06-09 20:06:46)
Solution re: Half solution -- the second half by Charlie (2005-06-09 19:36:35)
Difficulty: 2 of 5Under Are we odd for liking this? (in Cryptography)
Posted on 2005-06-09 (12 Comments)
Solution re(2): thoughts (spoiler) by Charlie (2005-06-09 13:44:14)
Some Thoughts thoughts by Charlie (2005-06-09 13:09:01)
Difficulty: 3 of 5Under Sliding pennies #2 (in General)
Posted on 2005-06-06 (16 Comments)
re: 3 moves by Charlie (2005-06-09 14:14:44)
Difficulty: 3 of 5Under At the grocery store (in Probability)
Posted on 2005-06-05 (4 Comments)
Solution solution by Charlie (2005-06-05 17:37:23)
Difficulty: 3 of 5Under Classic counterfeit coin problem (in Weights and Scales)
Posted on 2005-06-04 (13 Comments)
re: Another way to answer it by Charlie (2005-06-05 17:43:52)
Difficulty: 3 of 5Under Twenty metal blocks (in Weights and Scales)
Posted on 2005-06-02 (19 Comments)
re(3): between... by Charlie (2005-06-05 22:31:36)
re(2): between... by Charlie (2005-06-04 04:08:35)
Some Thoughts between... by Charlie (2005-06-02 19:54:16)
Difficulty: 2 of 5Under Circle of numbers (in Numbers)
Posted on 2005-05-27 (31 Comments)
re(5): What now ? - you're right again !! by Charlie (2005-06-01 15:20:09)
Difficulty: 2 of 5Under Count with me (in Sequences)
Posted on 2005-05-26 (16 Comments)
Solution re: Answer?? by Charlie (2005-05-26 18:41:43)
Difficulty: 2 of 5Under Strange divisibility (in Just Math)
Posted on 2005-05-25 (27 Comments)
re(5): Remove Problem by Charlie (2005-05-27 15:20:26)
re(3): Remove Problem by Charlie (2005-05-27 14:10:25)
Question Hmmmm..... (spoiler?) by Charlie (2005-05-25 13:24:34)
Difficulty: 2 of 5Under Cartoon Prison (in Cryptography)
Posted on 2005-05-21 (12 Comments)
re: ALMOST THERE by Charlie (2005-05-21 14:14:33)
re: why garbage????????? by Charlie (2005-05-21 14:14:01)
Difficulty: 3 of 5Under Cut Wire (in Calculus)
Posted on 2005-05-20 (7 Comments)
Solution solution by Charlie (2005-05-20 19:15:03)
Difficulty: 4 of 5Under The Mad Tea Party (in Logic)
Posted on 2005-05-18 (33 Comments)
Solution computer solution by Charlie (2005-05-18 22:34:51)
Difficulty: 2 of 5Under Electrical Cube (in Science)
Posted on 2005-05-17 (5 Comments)
Solution solution by Charlie (2005-05-17 15:27:58)
Difficulty: 2 of 5Under Snow Splash (in Shapes)
Posted on 2005-05-15 (8 Comments)
re: different answer, four years on by Charlie (2009-04-30 18:46:35)
Difficulty: 2 of 5Under Radically confusing (in Numbers)
Posted on 2005-05-14 (16 Comments)
re: Fixing my Problem: by Charlie (2005-05-16 20:43:19)
Question re(2): it is two easy by Charlie (2005-05-16 03:39:04)
re: it is two easy by Charlie (2005-05-14 16:32:41)
Difficulty: 3 of 5Under There is something missing (in Games)
Posted on 2005-05-13 (29 Comments)
re(5): Haley's Comet vrs. Penny's Loafer: And the winner is.... by Charlie (2005-05-16 14:50:46)
re(4): Haley's Comet vrs. Penny's Loafer: And the winner is.... by Charlie (2005-05-16 14:10:44)
re(2): Haley's Comet vrs. Penny's Loafer: And the winner is.... by Charlie (2005-05-15 17:31:39)
Solution Computer Solution by Charlie (2005-05-13 21:03:15)
Difficulty: 2 of 5Under 50 - Digit Number II (in Numbers)
Posted on 2005-05-13 (12 Comments)
Solution A systematic approach by Charlie (2005-05-13 18:00:09)
Difficulty: 3 of 5Under Triangular Billiard Table (in Geometry)
Posted on 2005-05-12 (9 Comments)
Solution corrected program by Charlie (2005-05-14 03:57:21)
re: Method -- Solution, if I've done the trig right by Charlie (2005-05-12 20:51:37)
Some Thoughts Method by Charlie (2005-05-12 19:12:51)
Difficulty: 1 of 5Under A Few Coins II (in Numbers)
Posted on 2005-05-12 (6 Comments)
re: a different interpretation by Charlie (2005-05-12 16:48:09)
Difficulty: 1 of 5Under A Man Without Eyes (in Famous Riddles)
Posted on 2005-05-10 (31 Comments)
re: Some thoughts and maybe a spoiler by Charlie (2005-05-10 12:52:25)
Difficulty: 5 of 5Under Four switches (in General)
Posted on 2005-05-09 (37 Comments)
on second thought, I see that it doesn't by Charlie (2005-05-09 20:34:07)
Question ??? Is this It? ????? by Charlie (2005-05-09 20:27:35)
Difficulty: 2 of 5Under Inscribed Triangle (in Geometry)
Posted on 2005-05-07 (4 Comments)
Solution re: No Subject -- yes by Charlie (2005-05-07 19:53:17)
Difficulty: 4 of 5Under Line up (in Games)
Posted on 2005-05-06 (16 Comments)
re(2): N=3? by Charlie (2005-05-07 23:19:52)
Difficulty: 4 of 5Under Make it solvable (in Numbers)
Posted on 2005-05-05 (18 Comments)
Solution Rounding error by Charlie (2005-05-06 13:47:18)
re(4): First thoughts... ...(spoiler?) by Charlie (2005-05-05 19:55:13)
re(4): First thoughts... ...(spoiler?) by Charlie (2005-05-05 19:51:17)
Solution re(3): First thoughts... ...(spoiler?) by Charlie (2005-05-05 19:47:04)
Difficulty: 2 of 5Under Word Grid (in Word Problems)
Posted on 2005-05-02 (14 Comments)
re: Full Solution by hand by Charlie (2005-05-03 13:40:43)
Hints/Tips re(2): The only one I could find... by Charlie (2005-05-02 14:58:28)
Hints/Tips The only one I could find... by Charlie (2005-05-02 14:29:29)
Difficulty: 3 of 5Under Calculators at the ready.... (in Sequences)
Posted on 2005-04-30 (16 Comments)
re(2): I still can't see it. by Charlie (2005-05-03 13:53:24)
Difficulty: 3 of 5Under With my Power (in Riddles)
Posted on 2005-04-29 (25 Comments)
re(5): Well, I'm not sure about the singing... by Charlie (2005-05-03 14:55:58)
re: Well, I'm not sure about the singing... by Charlie (2005-04-29 14:43:20)
Difficulty: 3 of 5Under Pool Ball (in Games)
Posted on 2005-04-28 (16 Comments)
Solution Seems not to matter by Charlie (2005-04-28 15:14:53)
Difficulty: 4 of 5Under Just find two! (in Geometry)
Posted on 2005-04-27 (25 Comments)
re(3): Two solutions for one triangle! by Charlie (2005-05-08 03:51:48)
re: Two solutions for one triangle! by Charlie (2005-05-07 20:31:19)
Question re: Solution by Charlie (2005-04-27 20:39:37)
re: May not be possible by Charlie (2005-04-27 19:49:37)
Some Thoughts Not a solution, but the measured length. by Charlie (2005-04-27 19:45:53)
Difficulty: 2 of 5Under Sums and Letters (in Numbers)
Posted on 2005-04-27 (14 Comments)
re: No Subject by Charlie (2005-04-27 20:46:28)
Solution the computer solution by Charlie (2005-04-27 13:49:17)
Difficulty: 3 of 5Under 1000th digit (in Numbers)
Posted on 2005-04-26 (30 Comments)
re(2): Here Jonathan! by Charlie (2005-04-27 20:23:45)
Difficulty: 3 of 5Under Dividing a donut (in Shapes)
Posted on 2005-04-23 (35 Comments)
Solution re: An idea -- solution? (don't know if maximum is achieved) by Charlie (2005-04-24 15:22:29)
re(4): A seond step? by Charlie (2005-04-23 20:32:40)
Solution An idea -- solution? (don't know if maximum is achieved) by Charlie (2005-04-23 20:22:59)
re(2): A seond step? by Charlie (2005-04-23 19:59:50)
Difficulty: 3 of 5Under All the Marbles (in Logic)
Posted on 2005-04-22 (18 Comments)
Solution Another program by Charlie (2005-04-23 23:28:10)
Difficulty: 4 of 5Under Roll of the die (in Games)
Posted on 2005-04-21 (23 Comments)
re(5): a wiser approach by Charlie (2005-04-25 15:20:41)
re(3): a wiser approach by Charlie (2005-04-25 00:48:47)
Difficulty: 3 of 5Under Ice Floating in Water (in Science)
Posted on 2005-04-21 (31 Comments)
Solution re: Uncertainty by Charlie (2005-04-21 14:23:08)
Difficulty: 2 of 5Under drop it like it's hot! (in General)
Posted on 2005-04-20 (15 Comments)
re: Hopefully I read the instructions correctly (spoiler?) by Charlie (2005-04-20 19:38:43)
Difficulty: 4 of 5Under Sphere in Tetrahedron (in Shapes)
Posted on 2005-04-19 (7 Comments)
re: solution -- where the mistake is by Charlie (2005-04-20 15:27:30)
Solution solution by Charlie (2005-04-19 20:30:16)
Difficulty: 2 of 5Under Sunday the 1st (in Numbers)
Posted on 2005-04-18 (7 Comments)
Solution solution by Charlie (2005-04-18 13:40:00)
re: Papal question by Charlie (2005-04-18 13:35:30)
Difficulty: 2 of 5Under Billy's bag (in Probability)
Posted on 2005-04-17 (18 Comments)
re: Solution by Charlie (2005-04-17 17:04:01)
Difficulty: 4 of 5Under The Midville Muddlers (in Logic)
Posted on 2005-04-15 (23 Comments)
re(2): the computer (exhaustive) solution by Charlie (2005-04-19 16:22:31)
Solution the computer (exhaustive) solution by Charlie (2005-04-15 20:15:58)
Difficulty: 2 of 5Under This will go on for a while. (in Sequences)
Posted on 2005-04-15 (11 Comments)
re: Solution by Charlie (2005-04-15 14:14:06)
Difficulty: 4 of 5Under Guess a number (in Algorithms)
Posted on 2005-04-14 (19 Comments)
Some Thoughts Ideas by Charlie (2005-04-14 19:17:58)
Difficulty: 2 of 5Under Underwater Sound Localization (in Science)
Posted on 2005-04-14 (17 Comments)
re: Questioning the answers... by Charlie (2005-04-14 14:24:13)
Solution solution by Charlie (2005-04-14 13:35:30)
Difficulty: 3 of 5Under Tethered satellites (in Science)
Posted on 2005-04-13 (13 Comments)
more thoughts by Charlie (2005-04-13 22:42:39)
re: Just a guess by Charlie (2005-04-13 19:32:24)
Some Thoughts A start by Charlie (2005-04-13 19:29:35)
Difficulty: 3 of 5Under It is infinite if it isn't? (in Paradoxes)
Posted on 2005-04-12 (36 Comments)
re: Possible paradox by Charlie (2005-04-12 20:51:18)
Question I'm not getting this. by Charlie (2005-04-12 20:49:38)
Difficulty: 3 of 5Under Sports Starters (in Word Problems)
Posted on 2005-04-11 (28 Comments)
Hints/Tips peeking by Charlie (2005-04-13 13:49:17)
Some Thoughts No one has been inspired... (one answer) by Charlie (2005-04-12 02:55:24)
Difficulty: 2 of 5Under Only One Hand (in Games)
Posted on 2005-04-11 (31 Comments)
Solution Better idea--solution? by Charlie (2005-04-11 15:27:10)
Some Thoughts probably not quite it. by Charlie (2005-04-11 15:19:24)
Difficulty: 2 of 5Under Maximum impossible score (in Games)
Posted on 2005-04-10 (4 Comments)
Solution solution by Charlie (2005-04-10 16:58:39)
Difficulty: 3 of 5Under Sequence E.T. cetera (in Cryptography)
Posted on 2005-04-05 (11 Comments)
Solution re: Tracking this by Charlie (2005-04-06 13:45:45)
Some Thoughts Tracking this by Charlie (2005-04-06 13:20:39)
Difficulty: 2 of 5Under A Horse Tied To A Barn (in Shapes)
Posted on 2005-04-02 (10 Comments)
re: exact answer by Charlie (2005-04-06 16:12:51)
Solution solution by Charlie (2005-04-03 04:39:49)
Difficulty: 3 of 5Under Cutting Contrives Conical Cup (in Shapes)
Posted on 2005-04-01 (18 Comments)
re(2): Extension to this problem... -- numerical solution by Charlie (2005-04-10 14:29:47)
re: Extension to this problem... -- numerical solution by Charlie (2005-04-09 16:59:09)
practically speaking by Charlie (2005-04-01 19:28:23)
Solution re: Very rough approximation by Charlie (2005-04-01 19:16:30)
Difficulty: 4 of 5Under Desperately Difficult Derivative (in Calculus)
Posted on 2005-03-30 (10 Comments)
Solution re: Simple solution (spoiler alert!) by Charlie (2005-03-31 15:09:28)
Difficulty: 3 of 5Under What's wrong with CDs? (in Calculus)
Posted on 2005-03-30 (11 Comments)
re: Simpler Solution by Charlie (2005-03-31 19:38:11)
An Aside--trivia by Charlie (2005-03-30 15:53:06)
re: Solution by Charlie (2005-03-30 15:25:19)
Some Thoughts Non-Calculus Approximation--spoiler by Charlie (2005-03-30 14:14:46)
Difficulty: 3 of 5Under Intuitive Coins (in Algorithms)
Posted on 2005-03-29 (14 Comments)
Solution re(3): There's more to it.... (solution? spoiler?) -- larger sets by Charlie (2005-03-31 14:18:05)
re(2): There's more to it.... (solution? spoiler?) -- larger sets by Charlie (2005-03-31 13:08:57)
Solution re: There's more to it.... (solution? spoiler?) -- larger sets by Charlie (2005-03-30 19:40:13)
Difficulty: 3 of 5Under Equivalent Equator Empirical Experience! (in Science)
Posted on 2005-03-27 (12 Comments)
re: Solution by Charlie (2005-03-28 13:35:38)
Difficulty: 3 of 5Under Two false coins (in Weights and Scales)
Posted on 2005-03-25 (11 Comments)
Some Thoughts thoughts by Charlie (2005-03-25 20:30:57)
Difficulty: 4 of 5Under Dodecahedron (in Geometry)
Posted on 2005-03-24 (1 Comments)
Solution solution by Charlie (2005-03-25 19:57:24)
Difficulty: 3 of 5Under Fateful Fickle Fifteen (in Probability)
Posted on 2005-03-24 (9 Comments)
Solution another approach -- solution by Charlie (2005-03-24 20:30:51)
Some Thoughts faulty "solution" by Charlie (2005-03-24 14:51:38)
Difficulty: 3 of 5Under Prime Birthdays (in Just Math)
Posted on 2005-03-23 (2 Comments)
Solution computer enumeration--spoiler by Charlie (2005-03-23 20:35:17)
Difficulty: 2 of 5Under Roulette (in Probability)
Posted on 2005-03-23 (4 Comments)
Solution Part 2 spoiler by Charlie (2005-03-23 16:05:43)
Hints/Tips Hadn't noticed this while it was in the queue, but ... (part 1 spoiler) by Charlie (2005-03-23 15:05:14)
Difficulty: 3 of 5Under Two to the Three = Three to the Two? (in Numbers)
Posted on 2005-03-22 (9 Comments)
Solution Further extension -- spoiler by Charlie (2005-03-22 14:34:07)
Solution solution and extension--computer search--spoiler by Charlie (2005-03-22 14:07:08)
Difficulty: 3 of 5Under Prime Product Permutation (in Numbers)
Posted on 2005-03-21 (6 Comments)
re(2): Exhaustive Search via computer program -- spoiler by Charlie (2005-03-22 14:51:53)
Solution Exhaustive Search via computer program -- spoiler by Charlie (2005-03-21 15:15:26)
Difficulty: 3 of 5Under Inspector Morse (in Cryptography)
Posted on 2005-03-20 (24 Comments)
re(4): A (limited) start by Charlie (2005-03-23 13:45:52)
re(3): A (limited) start by Charlie (2005-03-23 13:25:30)
Hints/Tips words of more than 4 letters that could be formed by Charlie (2005-03-22 20:03:24)
re: If it helps ... by Charlie (2005-03-22 14:59:01)
Difficulty: 4 of 5Under Make it go! (in Science)
Posted on 2005-03-18 (18 Comments)
Solution re: Proof that the second part needs a numberical solution by Charlie (2005-03-19 20:43:47)
Solution Numerical Solution of Second Part by Charlie (2005-03-18 20:52:07)
Difficulty: 3 of 5Under Cut Cube = Cone (in Geometry)
Posted on 2005-03-17 (2 Comments)
Solution Computer Solution by Charlie (2005-03-17 19:31:42)
Difficulty: 2 of 5Under Black Jack (in Probability)
Posted on 2005-03-17 (8 Comments)
re(2): solution by Charlie (2005-03-18 15:30:08)
Solution solution by Charlie (2005-03-17 14:18:46)
Difficulty: 3 of 5Under Equal Diagonals (in Shapes)
Posted on 2005-03-16 (9 Comments)
re: Gentle Reply to Charlie by Charlie (2005-04-30 14:37:32)
Solution solution -- computer aided by Charlie (2005-03-16 20:35:29)
Difficulty: 3 of 5Under Great Directions (in Geometry)
Posted on 2005-03-16 (8 Comments)
re(3): I thought I'd try a picture by Charlie (2005-03-17 20:01:32)
re: I thought I'd try a picture by Charlie (2005-03-16 19:12:05)
Solution Explanation by Charlie (2005-03-16 14:42:34)
Difficulty: 3 of 5Under Clueless (in Numbers)
Posted on 2005-03-14 (7 Comments)
Solution Computer search -- spoiler by Charlie (2005-03-14 20:49:54)
re: Am I clueless? by Charlie (2005-03-14 19:05:02)
Difficulty: 2 of 5Under In the year 2525... (in Science)
Posted on 2005-03-14 (9 Comments)
re: About Nine-tenths of an answer. by Charlie (2005-03-14 12:31:53)
Difficulty: 4 of 5Under Pretty Potent Primes (in Numbers)
Posted on 2005-03-13 (12 Comments)
re(2): I think I've covered the possibilities--Computer Aided Solution by Charlie (2005-03-16 19:51:08)
Solution I think I've covered the possibilities--Computer Aided Solution by Charlie (2005-03-13 17:57:01)
re(2): A wild stab at an answer by Charlie (2005-03-13 17:50:52)
Difficulty: 3 of 5Under Prime Perimeter (in Logic)
Posted on 2005-03-11 (90 Comments)
re: Charlie's Skepticism by Charlie (2005-03-12 14:09:04)
re(2): full solution as understood by Charlie (2005-03-12 03:01:36)
re: full solution by Charlie (2005-03-11 20:35:47)
re: Semi-Solution? by Charlie (2005-03-11 18:26:51)
Difficulty: 3 of 5Under Curious Continuous Connection (in Shapes)
Posted on 2005-03-10 (4 Comments)
re(2): ...but can I draw it? by Charlie (2005-03-10 20:07:26)
re: ...but can I draw it? by Charlie (2005-03-10 19:53:41)
Difficulty: 3 of 5Under Fibonacci Fractions (in Just Math)
Posted on 2005-03-09 (17 Comments)
Solution re: Extended precision using UBASIC -- base 12 error in added matter by Charlie (2005-03-09 20:17:56)
Solution Extended precision using UBASIC by Charlie (2005-03-09 20:06:38)
Difficulty: 3 of 5Under Different Dot Domains Division (in Shapes)
Posted on 2005-03-08 (6 Comments)
Some Thoughts Close but no Cigar by Charlie (2005-03-08 18:54:31)
Difficulty: 2 of 5Under Obscure Quotation (in Word Problems)
Posted on 2005-03-08 (9 Comments)
re: like hebrew by Charlie (2005-03-08 13:33:30)
Difficulty: 4 of 5Under Boring, boring... (in Geometry)
Posted on 2005-03-06 (13 Comments)
Solution re: Overcomplicated? by Charlie (2005-03-08 14:26:12)
re(6): picture of the center by Charlie (2005-03-07 16:41:43)
re(6): picture of the center by Charlie (2005-03-07 16:14:00)
re(5): picture of the center by Charlie (2005-03-07 15:55:58)
re(3): picture of the center by Charlie (2005-03-07 14:15:51)
re(2): picture of the center by Charlie (2005-03-07 13:55:54)
Some Thoughts Monte Carlo approximation (numerical spoiler present) by Charlie (2005-03-06 17:42:42)
re: picture of the center by Charlie (2005-03-06 17:11:48)
Some Thoughts thoughts by Charlie (2005-03-06 17:06:49)
Hints/Tips picture of the center by Charlie (2005-03-06 16:59:18)
Difficulty: 3 of 5Under Where do I end up? (in Riddles)
Posted on 2005-03-04 (23 Comments)
re: First thoughts by Charlie (2005-03-04 17:47:10)
Difficulty: 3 of 5Under How old did you say they were? (in Logic)
Posted on 2005-03-03 (31 Comments)
re(2): On second thought..... by Charlie (2005-03-05 20:20:12)
Solution re(4): Solution (??) by Charlie (2005-03-04 18:47:53)
re(3): Solution (??) by Charlie (2005-03-04 18:17:49)
re: Solution (??) by Charlie (2005-03-04 13:59:36)
Solution solution by Charlie (2005-03-03 20:47:33)
Difficulty: 2 of 5Under Probability test (in Probability)
Posted on 2005-03-03 (13 Comments)
Solution Solution + by Charlie (2005-03-03 14:50:05)
Difficulty: 2 of 5Under Hajja's Rational Cosine (in Geometry)
Posted on 2005-03-02 (2 Comments)
Hints/Tips Half an answer by Charlie (2005-03-02 16:22:03)
Difficulty: 3 of 5Under An Ace for a Pair (in Probability)
Posted on 2005-03-01 (12 Comments)
re: similarities to problem number... by Charlie (2005-03-04 16:22:16)
re(2): I think this is it. by Charlie (2005-03-01 21:19:50)
Simulation shows different numbers (spoilers present) by Charlie (2005-03-01 21:16:34)
Solution I think this is it. by Charlie (2005-03-01 19:48:11)
Difficulty: 2 of 5Under 9! (in Just Math)
Posted on 2005-02-28 (12 Comments)
re: Solution by Charlie (2005-03-01 17:56:58)
Solution re: thoughts (OK, I tried, but...) (spoiler) by Charlie (2005-02-28 16:24:48)
Some Thoughts thoughts by Charlie (2005-02-28 16:15:59)
Difficulty: 3 of 5Under Digit Counting (in Numbers)
Posted on 2005-02-25 (2 Comments)
Solution solution by Charlie (2005-02-25 14:25:24)
Difficulty: 4 of 5Under Quadruplets with Square Triplets (in Numbers)
Posted on 2005-02-23 (10 Comments)
Question re: Number of Solutions (spoilers present) by Charlie (2005-02-24 13:39:08)
Difficulty: 4 of 5Under Sums of Squares (in Numbers)
Posted on 2005-02-21 (8 Comments)
Solution researched (spoiler) by Charlie (2005-02-22 14:04:09)
Difficulty: 3 of 5Under Ballpark Figures (in Cryptography)
Posted on 2005-02-18 (4 Comments)
Solution re(2): No hockey, so why not try baseball? by Charlie (2005-02-18 18:56:53)
re: No hockey, so why not try baseball? by Charlie (2005-02-18 18:37:06)
Difficulty: 4 of 5Under Biased Coins (in Just Math)
Posted on 2005-02-17 (9 Comments)
re(2): Simple solution by Charlie (2005-02-19 02:55:00)
Difficulty: 3 of 5Under Only One Question (in Liars and Knights)
Posted on 2005-02-16 (23 Comments)
Solution re: part one by Charlie (2005-02-16 20:20:46)
Hints/Tips part one by Charlie (2005-02-16 19:27:11)
Difficulty: 5 of 5Under Figure Eights (in General)
Posted on 2005-02-15 (34 Comments)
re: This may work! by Charlie (2005-02-16 13:27:11)
re: still thinking by Charlie (2005-02-16 03:31:26)
re: additional thoughts by Charlie (2005-02-15 19:04:45)
Difficulty: 3 of 5Under String length differences (in General)
Posted on 2005-02-15 (5 Comments)
Solution solution by Charlie (2005-02-15 15:23:00)
Difficulty: 2 of 5Under Printer Problems (in General)
Posted on 2005-02-14 (7 Comments)
Some Thoughts thoughts by Charlie (2005-02-14 18:53:37)
Difficulty: 3 of 5Under Only Isosceles (in Geometry)
Posted on 2005-02-13 (6 Comments)
Solution solution by Charlie (2005-02-14 04:39:21)
Difficulty: 3 of 5Under Random Check (in Algorithms)
Posted on 2005-02-11 (11 Comments)
re: Probable Solution by Charlie (2005-02-12 17:56:03)
re: Am I oversimplifying? by Charlie (2005-02-11 18:08:54)
Difficulty: 5 of 5Under Four Pins and a Rubber Band (in Probability)
Posted on 2005-02-10 (11 Comments)
Question about the solution by Charlie (2005-02-20 16:35:28)
Hints/Tips thoughts--and a simulation by Charlie (2005-02-10 18:07:01)
Difficulty: 1 of 5Under Events (in Sequences)
Posted on 2005-02-10 (14 Comments)
more interesting combinations by Charlie (2005-02-10 15:41:28)
Difficulty: 4 of 5Under God and the Devil (in Games)
Posted on 2005-02-08 (67 Comments)
re: Regarding randomness by Charlie (2005-02-09 02:11:30)
Difficulty: 3 of 5Under Open = Closed (in Just Math)
Posted on 2005-02-07 (6 Comments)
re(2): solution by Charlie (2005-02-08 01:52:35)
Solution solution (spoiler) by Charlie (2005-02-07 18:55:59)
Difficulty: 3 of 5Under Universal Order (in Sequences)
Posted on 2005-02-07 (14 Comments)
re: Elementary! by Charlie (2014-03-16 13:58:11)
Question re(3): Possible error? by Charlie (2005-02-09 13:27:04)
re(4): Possible error? by Charlie (2005-02-09 13:23:49)
Solution The full text (spoiler) by Charlie (2005-02-07 14:59:16)
Solution The list by Charlie (2005-02-07 14:48:39)
Difficulty: 4 of 5Under Connect The Dots (in Geometry)
Posted on 2005-02-06 (15 Comments)
re(4): Detailed Solution by Charlie (2005-02-09 13:35:18)
Question re(2): Detailed Solution by Charlie (2005-02-08 15:03:26)
re: Short solution by Charlie (2005-02-07 20:41:35)
Question re: Detailed Solution by Charlie (2005-02-06 20:13:16)
Solution re: going much further by Charlie (2005-02-06 19:24:15)
Difficulty: 5 of 5Under Pizza Cutter (in Geometry)
Posted on 2005-02-04 (11 Comments)
Some Thoughts thoughts by Charlie (2005-02-05 02:37:54)
Difficulty: 3 of 5Under Teetering on the Edge (in General)
Posted on 2005-02-04 (8 Comments)
re: Solution, spoiler by Charlie (2005-02-04 15:36:22)
Difficulty: 5 of 5Under Function(Function()) Finding (in Calculus)
Posted on 2005-02-02 (13 Comments)
Solution solution (spoiler) by Charlie (2005-02-02 19:38:43)
Difficulty: 2 of 5Under Reverse and Differ (in Numbers)
Posted on 2005-02-01 (7 Comments)
re(2): Solution by Charlie (2013-03-29 11:42:21)
Difficulty: 2 of 5Under Changing aces (in Probability)
Posted on 2005-01-31 (9 Comments)
re: Solution by Charlie (2005-01-31 15:16:14)
Difficulty: 4 of 5Under Decagon (in Shapes)
Posted on 2005-01-30 (6 Comments)
Solution The answer seems to be... by Charlie (2005-01-31 04:46:57)
Some Thoughts re: more thoughts by Charlie (2005-01-31 00:28:25)
Some Thoughts more thoughts by Charlie (2005-01-31 00:19:02)
Some Thoughts thoughts by Charlie (2005-01-30 22:27:41)
Difficulty: 3 of 5Under Bisect The Segment (in Geometry)
Posted on 2005-01-29 (8 Comments)
Solution re: solution by Charlie (2005-01-30 16:13:38)
Difficulty: 4 of 5Under Rectangular Logic (in Logic)
Posted on 2005-01-28 (52 Comments)
re(2): solution by Charlie (2005-02-07 15:10:53)
Solution solution by Charlie (2005-02-01 16:03:14)
Question perplexed by Charlie (2005-02-01 15:42:53)
re: solution is right but logic might be flawed by Charlie (2005-02-01 05:21:46)
Solution Did anyone have this solution yet? by Charlie (2005-02-01 03:04:32)
Difficulty: 4 of 5Under Opposite synonyms (in Word Problems)
Posted on 2005-01-28 (9 Comments)
re: A solution by Charlie (2012-11-18 11:19:34)
Solution words by Charlie (2005-01-28 15:57:29)
Difficulty: 1 of 5Under A rainbow of haves and have-nots (in Word Problems)
Posted on 2005-01-26 (15 Comments)
re: I have it not by Charlie (2005-01-26 15:51:46)
Difficulty: 3 of 5Under The Rule of 72 (in Just Math)
Posted on 2005-01-25 (7 Comments)
Solution No Subject by Charlie (2005-01-25 20:00:23)
Difficulty: 4 of 5Under Voting power distribution (in General)
Posted on 2005-01-24 (13 Comments)
re: Christmas Crackers by Charlie (2005-01-27 04:04:57)
Solution re: computer solution by Charlie (2005-01-25 01:49:14)
Solution computer solution by Charlie (2005-01-25 01:44:41)
Difficulty: 3 of 5Under I See No Ships (in Geometry)
Posted on 2005-01-23 (17 Comments)
re(3): RE: I see no ship by Charlie (2005-01-25 01:18:52)
Solution Three solutions by Charlie (2005-01-23 16:32:06)
Difficulty: 4 of 5Under Word Meld 7 (in Word Problems)
Posted on 2005-01-22 (12 Comments)
Question re: 3-letters with a better list (spoiler) by Charlie (2005-01-23 14:34:01)
re: 3-letter nomination (spoiler) by Charlie (2005-01-23 01:43:44)
Some Thoughts thoughts by Charlie (2005-01-22 15:53:45)
Difficulty: 2 of 5Under Hungry Ant (in Tricks)
Posted on 2005-01-21 (15 Comments)
re(3): Solution by Charlie (2005-01-21 16:21:39)
Solution re: Solution by Charlie (2005-01-21 15:16:51)
Difficulty: 3 of 5Under Most Letters 2 (in Word Problems)
Posted on 2005-01-20 (16 Comments)
Solution computer solution by Charlie (2005-01-20 15:55:31)
re: A B C by Charlie (2005-01-20 14:06:33)
Difficulty: 3 of 5Under Sphere Pyramid (in Geometry)
Posted on 2005-01-19 (4 Comments)
re: Solution by Charlie (2005-01-19 18:39:54)
Solution solution by Charlie (2005-01-19 18:35:43)
Difficulty: 3 of 5Under Throwing needles (in Probability)
Posted on 2005-01-19 (9 Comments)
re(4): Simulation supports by Charlie (2005-01-21 19:45:40)
Solution re(2): Simulation supports by Charlie (2005-01-21 16:38:07)
Solution Simulation supports "second thoughts" by Charlie (2005-01-21 14:57:14)
Solution re: solution -- second thoughts by Charlie (2005-01-20 13:51:09)
Some Thoughts solution by Charlie (2005-01-19 14:29:05)
Difficulty: 3 of 5Under All integers (in Geometry)
Posted on 2005-01-17 (14 Comments)
Programmed Correctly Now by Charlie (2005-01-18 20:42:43)
re: Solution, by hand by Charlie (2005-01-18 20:23:52)
re(3): Solution by Charlie (2005-01-18 15:53:46)
re: Solution by Charlie (2005-01-18 13:19:50)
Attempt at Computer Solution by Charlie (2005-01-17 17:26:41)
Difficulty: 3 of 5Under Where on Earth II (in Geometry)
Posted on 2005-01-16 (5 Comments)
Solution solution by Charlie (2005-01-20 14:17:53)
Hints/Tips Clues by Charlie (2005-01-16 21:44:40)
Difficulty: 3 of 5Under Noisy Code (in Cryptography)
Posted on 2005-01-15 (17 Comments)
re: It also looks like... by Charlie (2005-01-16 00:20:18)
Difficulty: 4 of 5Under Playing Lotto (in Probability)
Posted on 2005-01-14 (14 Comments)
re: Stirling Perhaps by Charlie (2005-01-15 16:33:57)
re: my solution by Charlie (2005-01-15 15:45:14)
re: Stirling Perhaps by Charlie (2005-01-15 04:58:53)
Solution solution by Charlie (2005-01-14 19:35:20)
Some Thoughts thoughts by Charlie (2005-01-14 19:00:49)
Difficulty: 4 of 5Under Whadduzitdo? (in Algorithms)
Posted on 2005-01-14 (10 Comments)
Solution Solution by Charlie (2005-01-14 16:44:14)
Hints/Tips An implementation (with results--a Hint--so look only if you want the hint) by Charlie (2005-01-14 15:16:49)
Difficulty: 5 of 5Under Unequaled inequalities (in General)
Posted on 2005-01-13 (10 Comments)
Solution computer solution (spoiler) by Charlie (2005-01-14 06:32:56)
Some Thoughts re(2): a start + Possible solution by Charlie (2005-01-13 20:45:02)
Some Thoughts a start by Charlie (2005-01-13 20:13:53)
Difficulty: 3 of 5Under Mirror in the bathroom. (in Geometry)
Posted on 2005-01-13 (12 Comments)
re: We are not done yet! by Charlie (2005-01-14 04:51:45)
Difficulty: 3 of 5Under Four Letter Sequences (in Word Problems)
Posted on 2005-01-12 (9 Comments)
Solution Computer Solution by Charlie (2005-01-13 02:47:23)
Difficulty: 4 of 5Under Who will win? (in Games)
Posted on 2005-01-10 (10 Comments)
re(5): Solution by Charlie (2005-01-10 20:12:13)
Question re(3): Solution by Charlie (2005-01-10 19:11:59)
Difficulty: 3 of 5Under Square pairs (in Numbers)
Posted on 2005-01-09 (12 Comments)
Solution Computer Solution--Spoiler by Charlie (2005-01-09 19:25:52)
Difficulty: 4 of 5Under Rummy Luck (in Probability)
Posted on 2005-01-07 (9 Comments)
Question Anyone have an algorithm for evaluating a hand? by Charlie (2005-01-07 20:27:08)
Solution For the first case by Charlie (2005-01-07 18:35:43)
Difficulty: 4 of 5Under Cubic Dilemma (in Cryptography)
Posted on 2005-01-05 (8 Comments)
Solution solution by Charlie (2005-01-05 20:26:23)
Difficulty: 3 of 5Under Prime divisors (in Just Math)
Posted on 2005-01-04 (13 Comments)
another computer solution by Charlie (2021-06-19 08:24:45)
re: A further analysis by Charlie (2005-01-04 18:51:16)
Solution re(3): Solution (VB program) by Charlie (2005-01-04 18:29:01)
Solution re: Solution (VB program) by Charlie (2005-01-04 16:00:11)
Difficulty: 3 of 5Under Are you ill? (in Probability)
Posted on 2005-01-03 (19 Comments)
solution by Charlie (2005-01-03 18:01:27)
Difficulty: 3 of 5Under Bumper Cars (in Logic)
Posted on 2004-12-30 (15 Comments)
re: thought by Charlie (2005-01-01 16:57:18)
Solution re(2): Solution by Charlie (2004-12-31 13:32:58)
re: Solution -- another way of looking at it by Charlie (2004-12-30 18:58:58)
Difficulty: 2 of 5Under Tent folding (in Shapes)
Posted on 2004-12-30 (8 Comments)
re(4): Solution? (spoilers) by Charlie (2005-01-01 17:03:51)
Difficulty: 1 of 5Under Mixing Digits (in Numbers)
Posted on 2004-12-29 (25 Comments)
re(4): Solution (spoilers) by Charlie (2004-12-29 16:43:19)
Solution re: Solution by Charlie (2004-12-29 15:08:59)
Difficulty: 4 of 5Under Marble-Go-Round (in Probability)
Posted on 2004-12-28 (5 Comments)
re(2): solution (spoiler) by Charlie (2005-01-02 17:33:23)
Solution solution (spoiler) by Charlie (2004-12-28 20:15:47)
Difficulty: 3 of 5Under Fill In The Squares (in Logic)
Posted on 2004-12-28 (23 Comments)
re(2): Complete Solution! no computer by Charlie (2004-12-30 04:44:39)
Solution computer solution--spoiler by Charlie (2004-12-28 20:19:02)
Difficulty: 4 of 5Under Circle and Spots (in Geometry)
Posted on 2004-12-27 (10 Comments)
re(2): researched by Charlie (2004-12-28 17:27:47)
re: researched by Charlie (2004-12-27 20:30:34)
Solution researched by Charlie (2004-12-27 20:26:45)
Difficulty: 4 of 5Under A Square Problem (in Shapes)
Posted on 2004-12-26 (18 Comments)
Of course... by Charlie (2004-12-27 15:39:34)
re(2): Where To Place The Square by Charlie (2004-12-27 02:13:30)
re: Probable solution by Charlie (2004-12-26 19:01:10)
Difficulty: 2 of 5Under A Screw Loose (in General)
Posted on 2004-12-25 (8 Comments)
re: Hold on a second!!! by Charlie (2004-12-30 04:51:15)
Difficulty: 3 of 5Under Inheritance Envelopes (in Numbers)
Posted on 2004-12-24 (4 Comments)
Solution re: computer solution--listing improvement by Charlie (2004-12-26 21:02:25)
Solution computer solution by Charlie (2004-12-25 01:18:08)
Difficulty: 3 of 5Under Four Fours Fancy Formula! (in Just Math)
Posted on 2004-12-24 (6 Comments)
Solution heuristic solution by Charlie (2004-12-24 15:10:29)
Difficulty: 3 of 5Under Math Class (in Numbers)
Posted on 2004-12-23 (9 Comments)
re: Clarification Required by Charlie (2004-12-23 20:37:02)
Difficulty: 2 of 5Under Common Phrases (in Word Problems)
Posted on 2004-12-23 (24 Comments)
re(3): Of course I know of others! by Charlie (2004-12-23 20:23:07)
re(3): Of course I know of others! by Charlie (2004-12-23 20:22:58)
re: Of course I know of others! by Charlie (2004-12-23 16:24:13)
re: 5 out of 7 by Charlie (2004-12-23 14:32:43)
Difficulty: 4 of 5Under Buric's Cube (in General)
Posted on 2004-12-22 (7 Comments)
re: Solution : Method and Spoiler by Charlie (2004-12-22 19:13:04)
Difficulty: 1 of 5Under Another Simple Sequence (in Sequences)
Posted on 2004-12-22 (11 Comments)
re: guess by Charlie (2004-12-23 13:40:12)
But some say... by Charlie (2004-12-22 15:43:46)
Difficulty: 3 of 5Under Rational Result? Ridiculous! (in Numbers)
Posted on 2004-12-20 (20 Comments)
Solution an example--solution by Charlie (2004-12-20 17:11:30)
Difficulty: 2 of 5Under Logic Test (in Logic)
Posted on 2004-12-19 (13 Comments)
Solution My QB Program by Charlie (2004-12-19 17:52:56)
Difficulty: 4 of 5Under Odd Sequence (in Sequences)
Posted on 2004-12-17 (6 Comments)
Solution Cleaner list by Charlie (2004-12-19 15:47:29)
Solution UBASIC program and complete list by Charlie (2004-12-18 15:06:59)
Difficulty: 4 of 5Under The sum of a sequence (in Just Math)
Posted on 2004-12-14 (10 Comments)
all the solutions need... by Charlie (2004-12-14 18:35:20)
re: Solution by Charlie (2004-12-14 18:28:11)
Solution solution by Charlie (2004-12-14 18:08:42)
Difficulty: 2 of 5Under Sequence of Musical Tones (in Algorithms)
Posted on 2004-12-14 (20 Comments)
re: Yeah, but I did it by hand (and other questions) by Charlie (2004-12-15 03:04:48)
re(3): computer solution by Charlie (2004-12-14 16:05:28)
re: computer solution by Charlie (2004-12-14 15:19:34)
Solution computer solution by Charlie (2004-12-14 15:12:18)
Difficulty: 3 of 5Under Many heads (in Probability)
Posted on 2004-12-13 (6 Comments)
A harder problem by Charlie (2004-12-15 14:08:14)
Solution solution by Charlie (2004-12-13 19:44:06)
Difficulty: 3 of 5Under Grass Roots (in Shapes)
Posted on 2004-12-12 (13 Comments)
Alternate method by Charlie (2004-12-12 19:27:38)
re: Solution by Charlie (2004-12-12 19:01:27)
Difficulty: 3 of 5Under Knight Moves (in General)
Posted on 2004-12-10 (10 Comments)
Solution With board diagrams by Charlie (2004-12-11 04:55:04)
Solution All four by Charlie (2004-12-11 02:14:01)
Solution One less turn by Charlie (2004-12-11 02:00:37)
re: One computer solution by Charlie (2004-12-10 21:25:24)
Solution One computer solution by Charlie (2004-12-10 21:19:39)
Difficulty: 3 of 5Under Dragon Hunting (in General)
Posted on 2004-12-10 (37 Comments)
Solution If temporary incapacitation is not death, then... by Charlie (2004-12-10 16:49:54)
Difficulty: 3 of 5Under Disk Division (in Geometry)
Posted on 2004-12-09 (17 Comments)
re(2): Heptagon vs. 180 rotation by Charlie (2004-12-10 22:00:09)
re: Heptagon vs. 180 rotation by Charlie (2004-12-10 21:57:34)
Difficulty: 2 of 5Under 1 To 15 in a 3x5 Array (in Numbers)
Posted on 2004-12-09 (11 Comments)
re: Bug fixed and solutions multiply by Charlie (2004-12-09 19:25:19)
Solution Bug fixed and solutions multiply by Charlie (2004-12-09 19:15:13)
Solution All the solutions--computer solution by Charlie (2004-12-09 15:23:29)
Difficulty: 3 of 5Under High Rollers (in Probability)
Posted on 2004-12-08 (6 Comments)
re(2): solution by charlie by Charlie (2004-12-08 19:48:33)
Simulation results by Charlie (2004-12-08 19:00:05)
Solution solution by Charlie (2004-12-08 18:37:31)
Difficulty: 2 of 5Under Multi-Logarithms (in Just Math)
Posted on 2004-12-08 (10 Comments)
Question re: I think by Charlie (2005-01-20 19:17:40)
Solution solution by Charlie (2004-12-08 15:29:24)
Difficulty: 4 of 5Under I'm a knight! Really! (in Liars and Knights)
Posted on 2004-12-07 (18 Comments)
parts by Charlie (2004-12-07 19:44:24)
Difficulty: 3 of 5Under A Bit of a Problem (in Sequences)
Posted on 2004-12-07 (18 Comments)
Solution re: Hints by Charlie (2004-12-09 19:57:42)
Solution re: Solution (spoiler) -- different solution by Charlie (2004-12-07 15:47:48)
Difficulty: 4 of 5Under Trigonometric Fun (in Just Math)
Posted on 2004-12-06 (7 Comments)
re: Solution by Charlie (2004-12-06 21:50:53)
re: Arbitrary Evaluation by Charlie (2004-12-06 21:34:51)
Difficulty: 2 of 5Under Triangular Cubes (in Probability)
Posted on 2004-12-04 (11 Comments)
re: i c it this way by Charlie (2004-12-05 15:15:44)
Difficulty: 4 of 5Under Rumor Mill (in Probability)
Posted on 2004-12-03 (14 Comments)
re: Stat. analysis of Charlie's part 2 by Charlie (2004-12-05 01:23:58)
The next million trials by Charlie (2004-12-04 03:58:37)
re: More refined simulation for part 2 by Charlie (2004-12-04 03:16:52)
More refined simulation for part 2 by Charlie (2004-12-03 22:05:23)
Better Simulation for Part 2 by Charlie (2004-12-03 20:53:37)
Part 2 solution? by Charlie (2004-12-03 17:09:43)
Part 2 simulation by Charlie (2004-12-03 16:22:19)
Solution First Part by Charlie (2004-12-03 14:41:52)
Difficulty: 4 of 5Under Bully For You (in Shapes)
Posted on 2004-12-02 (5 Comments)
Solution What if the generating conic is not a circle? by Charlie (2004-12-02 19:11:04)
Solution solution by Charlie (2004-12-02 18:43:29)
Difficulty: 3 of 5Under Bounded Area (in Geometry)
Posted on 2004-12-01 (4 Comments)
Solution solution by Charlie (2004-12-01 20:17:26)
Difficulty: 4 of 5Under Exponential Difficulties 2 (in Just Math)
Posted on 2004-11-27 (9 Comments)
Solution solution by Charlie (2004-11-27 18:51:07)
Difficulty: 3 of 5Under M&M (in Sequences)
Posted on 2004-11-26 (4 Comments)
Solution solution by Charlie (2004-11-26 20:08:07)
Difficulty: 4 of 5Under Pack the Box 2 (in Shapes)
Posted on 2004-11-24 (7 Comments)
Solution re(2): solution by Charlie (2004-11-27 17:26:44)
Solution re: solution by Charlie (2004-11-27 17:17:15)
Solution re: solution by Charlie (2004-11-25 16:26:14)
Solution solution by Charlie (2004-11-25 16:22:10)
Not there yet... by Charlie (2004-11-24 20:30:33)
Difficulty: 2 of 5Under Find Friendly Fractions! (in Just Math)
Posted on 2004-11-24 (17 Comments)
re: 999999999999999 by Charlie (2004-11-27 16:30:01)
re(2): more fun and a reason by Charlie (2004-11-24 18:57:53)
Difficulty: 3 of 5Under 2 3 1 2 1 3 (in Numbers)
Posted on 2004-11-23 (10 Comments)
one more level by Charlie (2004-11-23 20:33:12)
Solution computer solution (spoiler) by Charlie (2004-11-23 20:29:25)
Difficulty: 4 of 5Under Year by Year (in Numbers)
Posted on 2004-11-23 (8 Comments)
re: alternate method (not tested) by Charlie (2004-11-23 16:28:43)
Solution solution (spoiler) by Charlie (2004-11-23 15:11:39)
Difficulty: 5 of 5Under Moon Experiment (in Science)
Posted on 2004-11-22 (22 Comments)
re: Completely Analytical Solution (Physics + Differential Calculus) by Charlie (2004-11-23 05:04:17)
Solution part 2 numerical solution by Charlie (2004-11-23 02:33:03)
re: If This Was Earth by Charlie (2004-11-23 01:41:03)
Solution re(2): part 1: another method; another answer (wrong assumption) by Charlie (2004-11-23 00:06:41)
part 1: another method; another answer by Charlie (2004-11-22 22:55:03)
part 1: different answer by Charlie (2004-11-22 20:31:17)
Difficulty: 3 of 5Under Blockout (in Just Math)
Posted on 2004-11-22 (10 Comments)
Solution computer methodology (spoilers) by Charlie (2004-11-22 14:38:11)
Difficulty: 2 of 5Under Four points on a Plane (in Shapes)
Posted on 2004-11-21 (15 Comments)
re(2): And three more by Charlie (2004-11-22 00:02:49)
Difficulty: 3 of 5Under Up to 35 (in Just Math)
Posted on 2004-11-14 (5 Comments)
Hints/Tips Am I seeing all the possibilities? (solution, if I am) by Charlie (2004-11-14 11:39:09)
Difficulty: 3 of 5Under Missing Digits (in Numbers)
Posted on 2004-11-10 (7 Comments)
re(2): Until I have time by Charlie (2004-11-11 10:32:28)
Difficulty: 3 of 5Under Speaking Volumes (in Numbers)
Posted on 2004-11-10 (19 Comments)
re(2): Solution (yes, too informal) by Charlie (2004-11-11 14:34:17)
Difficulty: 4 of 5Under Permuting a Square (in General)
Posted on 2004-11-08 (9 Comments)
re(2): tiny simplification thought by Charlie (2004-11-08 22:42:22)
re: solution (spoiler) by Charlie (2004-11-08 17:50:11)
re: tiny simplification thought by Charlie (2004-11-08 17:47:02)
Solution solution by Charlie (2004-11-08 15:14:56)
Difficulty: 3 of 5Under The Fair (in Logic)
Posted on 2004-11-08 (19 Comments)
re: Solution? by Charlie (2004-11-08 13:02:23)
Difficulty: 3 of 5Under Rameses' Pyramid (in General)
Posted on 2004-11-05 (15 Comments)
Solution solution by Charlie (2004-11-05 09:32:20)
Difficulty: 3 of 5Under On Tour (in Cryptography)
Posted on 2004-11-03 (29 Comments)
re: Number hints by Charlie (2004-11-11 12:38:00)
re: Number hints by Charlie (2004-11-10 10:00:51)
Difficulty: 4 of 5Under Measure that angle IV (in Geometry)
Posted on 2004-11-02 (21 Comments)
re: Not sure why I don't get the same answer by Charlie (2004-11-09 16:06:21)
re(3): Just following the rules by Charlie (2004-11-04 19:17:21)
Solution Iterative Solution by Charlie (2004-11-02 18:36:54)
Difficulty: 3 of 5Under 2-way maze (in General)
Posted on 2004-11-01 (21 Comments)
Solution computer verification of minimum by Charlie (2013-08-18 14:31:49)
Difficulty: 4 of 5Under Marble Game (in Probability)
Posted on 2004-11-01 (12 Comments)
re: No Subject by Charlie (2004-11-01 14:37:33)
Some Thoughts some values by Charlie (2004-11-01 14:25:51)
Difficulty: 4 of 5Under Square the Circle (in Geometry)
Posted on 2004-10-28 (9 Comments)
Riemann sums by Charlie (2004-10-29 02:11:20)
re: Some thoughts--Numeric solution by Charlie (2004-10-28 19:44:43)
re: Quad I by Charlie (2004-10-28 18:24:25)
Difficulty: 5 of 5Under The Watchdog (in Calculus)
Posted on 2004-10-28 (29 Comments)
re: Finally by Charlie (2004-10-30 15:28:06)
re: Pi Dog Night by Charlie (2004-10-29 17:31:38)
re: WD-40 please! - spoilers by Charlie (2004-10-28 15:27:33)
Difficulty: 3 of 5Under Octagon in a Circle (in Geometry)
Posted on 2004-10-25 (6 Comments)
re(2): solution by Charlie (2004-10-25 20:53:17)
Solution solution by Charlie (2004-10-25 16:00:08)
Difficulty: 3 of 5Under Select an Item (in Algorithms)
Posted on 2004-10-22 (13 Comments)
re(4): Very Simple by Charlie (2004-10-22 19:09:22)
Solution re(2): Very Simple by Charlie (2004-10-22 17:38:27)
Difficulty: 2 of 5Under Prime Time Revisited (in Just Math)
Posted on 2004-10-22 (17 Comments)
Solution UBASIC program by Charlie (2004-10-22 15:40:33)
Difficulty: 3 of 5Under Two circles (in Geometry)
Posted on 2004-10-21 (11 Comments)
Solution three circle case by Charlie (2004-10-21 17:32:50)
Solution re: Two circles case--further explanation by Charlie (2004-10-21 17:20:06)
Difficulty: 3 of 5Under Who Stole the Birdseed? (in Logic)
Posted on 2004-10-21 (134 Comments)
Solution re: There are more than one valid answer ? by Charlie (2004-10-22 16:08:31)
Difficulty: 2 of 5Under Jumping Coins (in General)
Posted on 2004-10-18 (9 Comments)
Solution exhaustive search by Charlie (2004-10-20 02:49:03)
Solution Working backwards by Charlie (2004-10-18 15:49:22)
Difficulty: 4 of 5Under Circles Abound (2) (in Geometry)
Posted on 2004-10-17 (11 Comments)
Hints/Tips a start by Charlie (2004-10-17 15:26:47)
Difficulty: 2 of 5Under The Sum of the Parts Is Less Than And More Than the Parts (in Numbers)
Posted on 2004-10-15 (11 Comments)
Another Practical Use by Charlie (2004-10-16 16:54:51)
Difficulty: 2 of 5Under Equiangular Hexagons (in Shapes)
Posted on 2004-10-15 (9 Comments)
re: part 2 by paper; part 1 by computer by Charlie (2004-10-15 14:55:23)
Solution part 2 by paper; part 1 by computer by Charlie (2004-10-15 14:51:19)
Difficulty: 4 of 5Under Flipping Coins (in Probability)
Posted on 2004-10-13 (26 Comments)
re(2): About the expected value by Charlie (2004-10-15 15:17:35)
Question re: New approach by Charlie (2004-10-15 03:58:53)
About the expected value by Charlie (2004-10-15 03:56:13)
re: solution (raw form) by Charlie (2004-10-13 19:46:51)
re: solution (raw form) by Charlie (2004-10-13 19:21:42)
Some Thoughts simulation for part 1 by Charlie (2004-10-13 18:58:19)
Solution solution (raw form) by Charlie (2004-10-13 18:37:50)
Difficulty: 3 of 5Under Shepherd's Puzzle (2) (in General)
Posted on 2004-10-12 (30 Comments)
re: Not sure if this is right, but.... by Charlie (2004-10-12 18:37:44)
re(2): solution by Charlie (2004-10-12 17:56:56)
Solution solution by Charlie (2004-10-12 13:53:10)
Difficulty: 3 of 5Under Zquare (in Shapes)
Posted on 2004-10-10 (23 Comments)
Solution No improvement on number but different by Charlie (2004-10-10 15:50:15)
Difficulty: 2 of 5Under Omikron, Rho, Sigma (in Sequences)
Posted on 2004-10-09 (8 Comments)
Solution Aces high by Charlie (2004-10-09 20:28:04)
Difficulty: 3 of 5Under Candy Box (in Numbers)
Posted on 2004-10-08 (18 Comments)
Some Thoughts new lower limit by Charlie (2004-10-08 13:07:18)
Some Thoughts Another division by Charlie (2004-10-08 12:55:10)
Difficulty: 2 of 5Under Chessboard Coin (in Probability)
Posted on 2004-10-08 (21 Comments)
re(3): Dumb Question by Charlie (2004-10-08 14:01:40)
re: Dumb Question by Charlie (2004-10-08 12:36:45)
Solution solution by Charlie (2004-10-08 09:29:35)
Difficulty: 3 of 5Under Similar Sequence Sum! (in Just Math)
Posted on 2004-10-07 (6 Comments)
Some Thoughts some numbers by Charlie (2004-10-07 13:11:42)
Difficulty: 2 of 5Under Your spelling is very bad (in Cryptography)
Posted on 2004-10-07 (16 Comments)
re(4): Answer by Charlie (2004-10-07 09:18:23)
Solution re(2): Answer by Charlie (2004-10-07 09:03:04)
Difficulty: 1 of 5Under Black And Brown Gloves (in Probability)
Posted on 2004-10-06 (27 Comments)
Some Thoughts Hmmmm.... by Charlie (2004-10-06 09:42:04)
Difficulty: 3 of 5Under A New Solid (in Shapes)
Posted on 2004-10-05 (19 Comments)
re: Very Simply Neat by Charlie (2004-10-05 20:25:48)
Solution Another way of showing solution by Charlie (2004-10-05 13:52:03)
re(2): Surely not the intended solution ! by Charlie (2004-10-05 13:05:24)
Difficulty: 3 of 5Under Tic-Tac-Toe Toss Tactics? (in Probability)
Posted on 2004-10-04 (11 Comments)
re(3): Solution by Charlie (2004-10-05 13:46:37)
re(3): Solution by Charlie (2004-10-05 13:35:34)
Solution re: Solution by Charlie (2004-10-05 09:52:21)
Difficulty: 1 of 5Under Interesting Sequence (3) (in Sequences)
Posted on 2004-10-04 (10 Comments)
re: Any Easier way ? by Charlie (2004-10-04 11:33:50)
Difficulty: 2 of 5Under The Most Letters (in Word Problems)
Posted on 2004-10-03 (12 Comments)
re: Profanity by Charlie (2004-10-04 09:47:18)
Some Thoughts How far down the list... by Charlie (2004-10-03 15:59:20)
Difficulty: 2 of 5Under Sequencing problems (in Numbers)
Posted on 2004-10-01 (10 Comments)
re(2): solution by Charlie (2004-10-01 12:23:20)
Solution solution by Charlie (2004-10-01 09:22:17)
Difficulty: 4 of 5Under Nice View (in Geometry)
Posted on 2004-09-29 (8 Comments)
re: off on a tangent by Charlie (2004-09-30 10:25:29)
Solution solution by Charlie (2004-09-29 13:46:13)
Difficulty: 3 of 5Under 72 degrees (in Weights and Scales)
Posted on 2004-09-29 (10 Comments)
Solution could it be...? by Charlie (2004-09-29 09:11:35)
Difficulty: 2 of 5Under Merit Review (in Sequences)
Posted on 2004-09-28 (6 Comments)
re: Answer by Charlie (2004-09-28 12:29:39)
Difficulty: 3 of 5Under Fill in the blanks (2) (in General)
Posted on 2004-09-28 (14 Comments)
re: Solution by Charlie (2004-09-28 11:02:47)
re: Solution by Charlie (2004-09-28 08:54:58)
Difficulty: 3 of 5Under 7/9 (in Numbers)
Posted on 2004-09-27 (7 Comments)
re: Computer Solution by Charlie (2004-09-27 16:16:18)
Difficulty: 5 of 5Under FIGURE it out (2) (in General)
Posted on 2004-09-25 (15 Comments)
broken down by number of colors on cube by Charlie (2004-09-25 18:09:51)
Solution Numbers by Charlie (2004-09-25 17:52:53)
re(3): solution: much opportunity for error-- correction by Charlie (2004-09-25 17:39:03)
re: A couple disagreements by Charlie (2004-09-25 17:31:00)
re: solution: much opportunity for error-- correction by Charlie (2004-09-25 17:10:30)
Solution solution: much opportunity for error by Charlie (2004-09-25 14:38:17)
Difficulty: 2 of 5Under Guess my number (in Numbers)
Posted on 2004-09-24 (22 Comments)
re: Solution + Explanation by Charlie (2004-09-24 10:02:37)
Difficulty: 3 of 5Under Rare Rotative Relationship! (in Numbers)
Posted on 2004-09-23 (13 Comments)
Solution The first few by Charlie (2004-09-23 13:27:56)
Difficulty: 3 of 5Under No Safety from the Queen (in General)
Posted on 2004-09-23 (14 Comments)
7x7 board has unique minimal solution (shown here--spoiler) by Charlie (2004-09-23 09:44:12)
re: 8x8 version--programs by Charlie (2004-09-23 09:34:32)
Some Thoughts 8x8 version by Charlie (2004-09-23 09:29:22)
Solution More than one way by Charlie (2004-09-23 08:59:56)
Difficulty: 3 of 5Under Squaring shapes: (in Geometry)
Posted on 2004-09-22 (10 Comments)
Solution solution by Charlie (2004-09-22 15:01:07)
re: solution by Charlie (2004-09-22 13:30:01)
Difficulty: 4 of 5Under Get one half by squaring (in Just Math)
Posted on 2004-09-20 (32 Comments)
re(2): The best that my program can do by Charlie (2004-09-21 14:24:45)
The best that my program can do by Charlie (2004-09-21 10:29:01)
Difficulty: 2 of 5Under Differential Cryptography (in Cryptography)
Posted on 2004-09-19 (8 Comments)
re(2): Interesting by Charlie (2004-09-20 08:59:44)
Interesting by Charlie (2004-09-19 22:28:42)
Difficulty: 2 of 5Under Highest Number (in Just Math)
Posted on 2004-09-18 (20 Comments)
re: How to do! by Charlie (2004-09-19 10:04:53)
Difficulty: 3 of 5Under A pool rack filled with balls (in Geometry)
Posted on 2004-09-17 (25 Comments)
re: A Point? by Charlie (2004-09-20 16:46:43)
re(2): Solution, I got confused. by Charlie (2004-09-17 14:27:45)
Solution re: Solution by Charlie (2004-09-17 14:17:18)
Solution Solution by Charlie (2004-09-17 13:23:25)
Difficulty: 3 of 5Under Lines of Reasoning (in General)
Posted on 2004-09-16 (20 Comments)
re(4): Has anyone noticed... by Charlie (2004-09-20 09:16:30)
re(4): Has anyone noticed... by Charlie (2004-09-19 22:17:02)
re(2): Has anyone noticed... by Charlie (2004-09-19 10:21:53)
Hints/Tips Has anyone noticed... by Charlie (2004-09-17 13:26:34)
Difficulty: 3 of 5Under Noughts and Crosses (in Games)
Posted on 2004-09-16 (7 Comments)
re: Solution by Charlie (2004-09-16 08:58:39)
Difficulty: 3 of 5Under Rectangle in lights (in General)
Posted on 2004-09-14 (4 Comments)
Solution Alternative Proof by Charlie (2004-09-14 13:37:55)
Difficulty: 3 of 5Under Hawks and Doves (in Probability)
Posted on 2004-09-13 (22 Comments)
re(3): To Make Oskar's Solution Work... by Charlie (2004-09-13 20:22:03)
re: To Make Oskar's Solution Work... by Charlie (2004-09-13 12:09:43)
re(2): Bird's Eye View ! by Charlie (2004-09-13 10:42:31)
re: Bird's Eye View ! by Charlie (2004-09-13 10:34:07)
Some Thoughts re: Half an answer by Charlie (2004-09-13 09:19:31)
Some Thoughts Half an answer by Charlie (2004-09-13 09:15:17)
Difficulty: 1 of 5Under Gonna party like it's 1999 (in Just Math)
Posted on 2004-09-12 (8 Comments)
Some Thoughts Observation by Charlie (2004-09-12 14:32:23)
Difficulty: 4 of 5Under FIGURE it out ! (in General)
Posted on 2004-09-10 (13 Comments)
re: solution -- numbers by Charlie (2004-09-10 16:55:57)
re: Solution for Squares by Charlie (2004-09-10 16:44:33)
Solution solution by Charlie (2004-09-10 15:08:51)
Difficulty: 3 of 5Under Nine kids (in Numbers)
Posted on 2004-09-09 (22 Comments)
Solution Brute force solutions (spoilers) by Charlie (2004-09-09 09:01:05)
Difficulty: 2 of 5Under Four-letter insert? (in Word Problems)
Posted on 2004-09-06 (11 Comments)
re(3): All seven by Charlie (2004-09-06 13:37:43)
Difficulty: 3 of 5Under Ten Words (3) (in Word Problems)
Posted on 2004-09-05 (14 Comments)
Some Thoughts Various words--not a solution set by Charlie (2004-09-05 15:14:26)
Difficulty: 2 of 5Under Another game of nim (in Games)
Posted on 2004-09-02 (11 Comments)
Solution the strategy by Charlie (2004-09-02 16:11:40)
Difficulty: 3 of 5Under Quiz Results (in Logic)
Posted on 2004-09-02 (30 Comments)
re(3): Tips to solve... Hit a Wall !!! by Charlie (2004-09-02 09:03:00)
Solution re: solution -- uniqueness proved w/ computer by Charlie (2004-09-02 08:59:06)
Solution solution by Charlie (2004-09-02 08:52:46)
Difficulty: 3 of 5Under Pairs of Socks (in Probability)
Posted on 2004-09-01 (20 Comments)
Solution solution by Charlie (2004-09-01 20:03:59)
Difficulty: 2 of 5Under Measure that angle II (in Geometry)
Posted on 2004-09-01 (18 Comments)
re(3): Solution + Explanation by Charlie (2004-09-01 16:39:30)
Solution re: Solution + Explanation by Charlie (2004-09-01 08:43:45)
Difficulty: 2 of 5Under Ages (in General)
Posted on 2004-08-31 (10 Comments)
Solution chart by Charlie (2004-08-31 10:27:05)
Difficulty: 2 of 5Under Moving Furniture (in General)
Posted on 2004-08-30 (7 Comments)
Solution solution by Charlie (2004-08-30 14:06:16)
Difficulty: 3 of 5Under Cubeless? (in Just Math)
Posted on 2004-08-29 (7 Comments)
re(2): Similar solution by Charlie (2004-08-30 10:54:23)
re: Similar solution by Charlie (2004-08-30 10:42:26)
Difficulty: 4 of 5Under Interesting Function (in Just Math)
Posted on 2004-08-28 (3 Comments)
Solution solution by Charlie (2004-08-28 11:50:11)
Difficulty: 3 of 5Under No zeroes allowed (in Numbers)
Posted on 2004-08-27 (4 Comments)
re: Solution by Charlie (2004-08-27 21:40:55)
More thoughts by Charlie (2004-08-27 15:41:52)
Some Thoughts First thoughts by Charlie (2004-08-27 15:13:48)
Difficulty: 4 of 5Under Circle, Circle, Sphere! (in Geometry)
Posted on 2004-08-26 (8 Comments)
Solution re: No Subject by Charlie (2004-08-26 14:32:20)
Difficulty: 3 of 5Under 8 = 4 + 4 (in Numbers)
Posted on 2004-08-26 (12 Comments)
Solution re: more values -- program by Charlie (2004-08-27 11:35:24)
re: Solution by Charlie (2004-08-26 11:15:42)
Difficulty: 3 of 5Under Nice sum (in Just Math)
Posted on 2004-08-24 (13 Comments)
Some Thoughts starting observation by Charlie (2004-08-24 12:54:58)
Difficulty: 3 of 5Under Prime Cross Letters (in Numbers)
Posted on 2004-08-24 (6 Comments)
Solution Hand-written program by Charlie (2004-08-24 08:57:18)
re: For Starters !!! by Charlie (2004-08-24 08:32:29)
Difficulty: 3 of 5Under Sins of the Gambler (in Probability)
Posted on 2004-08-23 (6 Comments)
Solution re: Classic martingale by Charlie (2004-08-23 10:20:16)
Difficulty: 2 of 5Under Number Pyramid (in Logic)
Posted on 2004-08-20 (24 Comments)
Solution computer solution by Charlie (2004-08-20 09:50:22)
Difficulty: 3 of 5Under Summing inverses (in Calculus)
Posted on 2004-08-19 (18 Comments)
re(3): Reason why sum of limits is not same as limit as sums by Charlie (2004-08-20 13:48:41)
re: Counterintuitive by Charlie (2004-08-19 12:56:49)
Solution solution by Charlie (2004-08-19 10:43:15)
Difficulty: 5 of 5Under Unique Necklaces (in General)
Posted on 2004-08-18 (15 Comments)
Solution Beyond me, but... (spoiler) by Charlie (2004-08-18 15:04:00)
Difficulty: 4 of 5Under Angry Friends (in Geometry)
Posted on 2004-08-17 (15 Comments)
re(2): Solution... by Charlie (2004-08-17 10:13:20)
Solution re: Solution... by Charlie (2004-08-17 09:47:44)
Difficulty: 3 of 5Under Factorials everywhere (in Just Math)
Posted on 2004-08-16 (7 Comments)
re: More trivial solutions by Charlie (2004-08-16 12:25:32)
Difficulty: 4 of 5Under Friday the 13th (in General)
Posted on 2004-08-13 (13 Comments)
re(2): solution and discussion by Charlie (2004-08-30 20:19:42)
re: Solution by Charlie (2004-08-13 14:10:15)
Solution solution and discussion by Charlie (2004-08-13 09:54:43)
Difficulty: 4 of 5Under Sum of two powers (in Just Math)
Posted on 2004-08-12 (7 Comments)
Some Thoughts a start by Charlie (2004-08-12 13:52:16)
Difficulty: 2 of 5Under BIG , BIGGER , BIGGEST (in Numbers)
Posted on 2004-08-12 (8 Comments)
Solution re: My Solution - comments? by Charlie (2004-08-12 08:21:25)
Difficulty: 4 of 5Under Unknown Digits (in Numbers)
Posted on 2004-08-11 (9 Comments)
Solution brute force -- spoiler by Charlie (2004-08-11 13:24:39)
Difficulty: 5 of 5Under Converging Circumference (in General)
Posted on 2004-08-09 (5 Comments)
Computer calculation, and reference data by Charlie (2004-08-09 13:11:20)
Difficulty: 2 of 5Under Using Cards as Dice (in Probability)
Posted on 2004-08-09 (9 Comments)
re: Query by Charlie (2004-08-09 10:37:42)
Difficulty: 4 of 5Under Six Cubes (in Geometry)
Posted on 2004-08-08 (5 Comments)
Solution how--solution by Charlie (2004-08-08 08:39:30)
Difficulty: 3 of 5Under Waiting, waiting... (in Probability)
Posted on 2004-08-07 (19 Comments)
re: a thought by Charlie (2004-08-09 16:19:49)
simulation by Charlie (2004-08-09 14:15:16)
Difficulty: 3 of 5Under No colors known? (in Games)
Posted on 2004-08-04 (17 Comments)
re(3): Solutions by Charlie (2004-08-05 15:40:53)
re: Solutions by Charlie (2004-08-05 08:00:20)
Difficulty: 2 of 5Under Cube Angle (in Geometry)
Posted on 2004-08-04 (14 Comments)
Solution Third solution--same answer by Charlie (2004-08-05 15:48:11)
Difficulty: 4 of 5Under Five Weights and a Broken Scale (in Weights and Scales)
Posted on 2004-08-02 (17 Comments)
re: 5 weighings by Charlie (2004-09-08 15:44:02)
re: The rest of my comment by Charlie (2004-08-03 11:41:38)
re: Inferior alternative by Charlie (2004-08-03 08:52:50)
The rest of my comment by Charlie (2004-08-02 16:12:29)
Some Thoughts Don't know if this is the fewest weighings... by Charlie (2004-08-02 16:08:36)
Difficulty: 3 of 5Under Another Couple (in General)
Posted on 2004-08-02 (9 Comments)
Some Thoughts some words by Charlie (2004-08-02 08:32:31)
Difficulty: 3 of 5Under Prime clock (in General)
Posted on 2004-08-01 (16 Comments)
Solution The computer method by Charlie (2004-08-01 11:29:46)
Difficulty: 3 of 5Under Maximum sum (in Probability)
Posted on 2004-07-29 (10 Comments)
re: simulation results by Charlie (2004-07-29 09:00:40)
Some Thoughts simulation results by Charlie (2004-07-29 08:52:40)
Difficulty: 4 of 5Under Three Circles (in Geometry)
Posted on 2004-07-28 (9 Comments)
Solution numerical answer by Charlie (2004-07-28 15:47:59)
Difficulty: 4 of 5Under Just by hand, only by hand, nothing but by hand? (in Algorithms)
Posted on 2004-07-26 (7 Comments)
Solution put another way by Charlie (2004-07-26 14:13:44)
Difficulty: 2 of 5Under How many 1s? (in Numbers)
Posted on 2004-07-26 (16 Comments)
re(2): Solutions by Charlie (2004-07-26 10:54:50)
re: Solutions by Charlie (2004-07-26 10:50:27)
Difficulty: 3 of 5Under Four Weights (in Weights and Scales)
Posted on 2004-07-25 (33 Comments)
Solution All the examples by Charlie (2004-07-25 14:12:08)
Some Thoughts An example by Charlie (2004-07-25 12:36:07)
re: a computerized start by Charlie (2004-07-25 12:18:58)
re: a computerized start by Charlie (2004-07-25 12:06:55)
Hints/Tips a computerized start by Charlie (2004-07-25 11:58:17)
Difficulty: 3 of 5Under Before and After (in Sequences)
Posted on 2004-07-23 (4 Comments)
Solution computer solution by Charlie (2004-07-23 11:19:08)
Difficulty: 4 of 5Under Unfolding cube (in Shapes)
Posted on 2004-07-22 (8 Comments)
Solution method by Charlie (2004-07-22 15:24:54)
Difficulty: 3 of 5Under Different Sums (in Numbers)
Posted on 2004-07-22 (17 Comments)
re(3): With a little help from awk by Charlie (2004-07-22 10:46:56)
Solution re(2): With a little help from awk by Charlie (2004-07-22 10:45:04)
Difficulty: 4 of 5Under Indexed Puzzle (in Logic)
Posted on 2004-07-19 (22 Comments)
Solution computer solution--spoiler present by Charlie (2004-07-19 15:09:48)
re: Getting started by Charlie (2004-07-19 13:48:44)
Difficulty: 3 of 5Under Fill in the Blanks (in Numbers)
Posted on 2004-07-18 (6 Comments)
Solution computer brute force (spoiler present)... by Charlie (2004-07-18 10:53:03)
Difficulty: 3 of 5Under Four Corners (in Algorithms)
Posted on 2004-07-17 (7 Comments)
re: Good start by Charlie (2004-07-17 15:18:30)
Difficulty: 4 of 5Under A Point and a Cube (in Geometry)
Posted on 2004-07-16 (23 Comments)
re: My numbers were wrong. by Charlie (2004-07-27 15:48:48)
Solution More precise computer solution by Charlie (2004-07-20 08:45:54)
re(2): Heuristic computer solution for modified problem by Charlie (2004-07-18 20:22:13)
re: Heuristic computer solution for modified problem by Charlie (2004-07-18 20:18:01)
Heuristic computer solution for modified problem by Charlie (2004-07-18 19:58:24)
Difficulty: 2 of 5Under Power of Multiplication (in Numbers)
Posted on 2004-07-16 (6 Comments)
re: General solution by Charlie (2004-07-16 22:05:41)
re: Solution -- observation by Charlie (2004-07-16 11:53:08)
Difficulty: 3 of 5Under Fibonacci sums (in Just Math)
Posted on 2004-07-15 (13 Comments)
re: what is being asked??? by Charlie (2004-07-15 22:00:20)
re: Inelegant solution by Charlie (2004-07-15 15:35:57)
Difficulty: 3 of 5Under Mirror, Mirror on the wall (in Numbers)
Posted on 2004-07-15 (9 Comments)
Solution re: Solution by Charlie (2004-07-15 23:06:27)
Some Thoughts computer by Charlie (2004-07-15 11:18:31)
Some Thoughts thoughts by Charlie (2004-07-15 09:03:04)
Difficulty: 2 of 5Under A Common Vertex (in Shapes)
Posted on 2004-07-12 (19 Comments)
re(4): solution- Missed Solution! by Charlie (2004-07-13 15:37:32)
re(3): solution by Charlie (2004-07-12 22:06:48)
re(3): solution by Charlie (2004-07-12 15:35:21)
re: solution by Charlie (2004-07-12 13:16:27)
Difficulty: 4 of 5Under Fingers game (in Games)
Posted on 2004-07-11 (5 Comments)
re: solution--the analysis program by Charlie (2004-07-11 12:51:38)
Solution solution by Charlie (2004-07-11 12:48:06)
Difficulty: 3 of 5Under 123456789 equals 100 (in Numbers)
Posted on 2004-07-10 (8 Comments)
Solution computer solution by Charlie (2004-07-10 13:38:52)
Difficulty: 4 of 5Under Poker Hands (in Probability)
Posted on 2004-07-09 (11 Comments)
re: additional complications by Charlie (2004-07-09 20:43:35)
Hints/Tips A start, a hint and a caveat. by Charlie (2004-07-09 10:45:04)
Difficulty: 3 of 5Under Who wins? (in Probability)
Posted on 2004-07-08 (10 Comments)
re(2): Mathematically by Charlie (2004-07-08 12:39:58)
Solution Mathematically by Charlie (2004-07-08 08:41:18)
Difficulty: 3 of 5Under Step Function (in Calculus)
Posted on 2004-07-07 (10 Comments)
re: honest effort by Charlie (2004-07-08 09:33:18)
Solution solution by Charlie (2004-07-07 13:40:06)
Difficulty: 2 of 5Under Nails, Inc. (in Weights and Scales)
Posted on 2004-07-06 (6 Comments)
Solution solution by Charlie (2004-07-06 13:42:00)
Difficulty: 3 of 5Under 101 - 102 (in General)
Posted on 2004-07-06 (19 Comments)
Solution solution by Charlie (2004-07-06 10:08:37)
Difficulty: 3 of 5Under Hands On A Clock (in General)
Posted on 2004-07-05 (23 Comments)
re(5): Solution by Charlie (2004-07-20 21:19:24)
re(3): Solution by Charlie (2004-07-20 13:08:00)
re: Solution by Charlie (2004-07-05 16:24:03)
Solution Brute Force (i.e., exhaustive search) by Charlie (2004-07-05 11:00:30)
Difficulty: 4 of 5Under Who Said That? (in Cryptography)
Posted on 2004-07-03 (5 Comments)
Some Thoughts Almost solution by Charlie (2004-07-03 13:20:01)
Difficulty: 3 of 5Under How often does he lie? (in Probability)
Posted on 2004-07-02 (8 Comments)
re: Solution by Charlie (2004-07-02 15:15:02)
Difficulty: 5 of 5Under Parking Cars (in Probability)
Posted on 2004-07-01 (15 Comments)
re: simulation--bug fix, but doesn't change answers by Charlie (2004-07-02 08:16:52)
re: Different? by Charlie (2004-07-02 00:34:05)
Some Thoughts simulation by Charlie (2004-07-02 00:16:28)
re: Question by Charlie (2004-07-01 22:46:00)
Difficulty: 3 of 5Under All Wired Up (in Logic)
Posted on 2004-06-30 (34 Comments)
re: Solution? by Charlie (2004-07-04 22:25:42)
re: none 'survivor'-ish answer by Charlie (2004-07-01 14:13:50)
re: Saving one trip? -- No, what was I thinking? by Charlie (2004-06-30 15:43:21)
Solution Saving one trip by Charlie (2004-06-30 15:27:53)
re: Solution by Charlie (2004-06-30 15:03:46)
Solution solution in... by Charlie (2004-06-30 14:47:50)
Difficulty: 3 of 5Under Special Number (in Numbers)
Posted on 2004-06-30 (9 Comments)
Solution re(2): Solution by Charlie (2004-06-30 09:51:25)
Some Thoughts re: Solution by Charlie (2004-06-30 09:42:42)
Difficulty: 3 of 5Under Subsetting a set (in Numbers)
Posted on 2004-06-29 (9 Comments)
Solution solution 1st part by Charlie (2004-06-29 14:24:46)
re(2): Second part by Charlie (2004-06-29 14:19:40)
Difficulty: 3 of 5Under Root Route (in Algorithms)
Posted on 2004-06-29 (7 Comments)
Some Thoughts two ways by Charlie (2004-06-29 08:21:39)
Difficulty: 3 of 5Under Consecutive Integer Sums (in Numbers)
Posted on 2004-06-28 (22 Comments)
re(2): Computer solution by Charlie (2004-06-29 08:07:06)
Solution Computer solution by Charlie (2004-06-28 21:20:13)
re: ummm... by Charlie (2004-06-28 17:00:40)
Difficulty: 3 of 5Under You say you want a revolution... (in Geometry)
Posted on 2004-06-27 (12 Comments)
Solution solution by Charlie (2004-06-27 15:06:38)
Difficulty: 2 of 5Under A square (in Numbers)
Posted on 2004-06-25 (15 Comments)
re(2): solution by Charlie (2004-06-26 00:19:07)
Solution solution by Charlie (2004-06-25 09:55:56)
Difficulty: 4 of 5Under Class Pass (in Probability)
Posted on 2004-06-24 (15 Comments)
re: A variation by Charlie (2004-06-25 11:05:03)
A variation by Charlie (2004-06-25 09:41:07)
re: Simulation with truly random numbers by Charlie (2004-06-25 07:25:46)
Some Thoughts Simulation with truly random numbers by Charlie (2004-06-25 00:44:19)
Some Thoughts Better randomization for simulation. by Charlie (2004-06-24 21:56:34)
Some Thoughts What's wrong with my simulation? by Charlie (2004-06-24 15:34:06)
Difficulty: 3 of 5Under Magic-in-more-than-one-way Square (in Numbers)
Posted on 2004-06-24 (12 Comments)
re: More on the solution by Charlie (2004-06-26 00:33:24)
Difficulty: 4 of 5Under Tetrahedral Dilemma (in Geometry)
Posted on 2004-06-23 (8 Comments)
Some Thoughts "solution" by Charlie (2004-06-23 15:39:10)
Difficulty: 3 of 5Under More or less magic square (in General)
Posted on 2004-06-22 (11 Comments)
re(2): Solution by Charlie (2004-06-22 14:34:29)
Difficulty: 3 of 5Under my house's number (in Numbers)
Posted on 2004-06-21 (32 Comments)
re(4): Poor AWK people... by Charlie (2004-06-22 21:59:44)
re(2): Poor AWK people... by Charlie (2004-06-22 09:58:02)
Difficulty: 3 of 5Under Not A Magic Square (in Numbers)
Posted on 2004-06-19 (14 Comments)
Observation re: Two solutions by Charlie (2004-06-21 00:09:56)
Solution Two solutions by Charlie (2004-06-19 17:25:43)
Difficulty: 3 of 5Under Fenced In (in Geometry)
Posted on 2004-06-18 (15 Comments)
re: Where did my math go wrong? by Charlie (2004-06-18 12:48:03)
Solution solution by Charlie (2004-06-18 10:08:07)
Difficulty: 4 of 5Under The odds stay unchanged (in Just Math)
Posted on 2004-06-17 (21 Comments)
re: Possibility? (spoiler?) by Charlie (2004-06-17 13:57:38)
Difficulty: 2 of 5Under Short equation (in Numbers)
Posted on 2004-06-17 (14 Comments)
re: moron by Charlie (2004-06-17 11:18:46)
Difficulty: 4 of 5Under Circles Abound! (in Geometry)
Posted on 2004-06-16 (7 Comments)
Solution solution by Charlie (2004-06-16 14:43:48)
Difficulty: 3 of 5Under Mileage (in Numbers)
Posted on 2004-06-16 (8 Comments)
Solution generalization by Charlie (2004-06-16 10:08:07)
re: Code used for finding palindromic numbers - no spoiler by Charlie (2004-06-16 10:03:20)
Difficulty: 3 of 5Under Fibonaccian nines (in Just Math)
Posted on 2004-06-15 (10 Comments)
Solution unsatisfying computer proof by Charlie (2004-06-15 14:26:26)
Difficulty: 2 of 5Under The Tournament (in Games)
Posted on 2004-06-15 (13 Comments)
re: this is easy by Charlie (2004-06-15 13:02:49)
Difficulty: 4 of 5Under What's the difference between snowmen and snowwomen? (in Just Math)
Posted on 2004-06-14 (18 Comments)
re(2): solution by Charlie (2004-06-14 13:58:13)
Solution solution by Charlie (2004-06-14 13:39:44)
Difficulty: 2 of 5Under Handshakes (in Numbers)
Posted on 2004-06-14 (14 Comments)
re: Solution by Charlie (2004-06-14 08:19:15)
Difficulty: 3 of 5Under Coin tossing (in Probability)
Posted on 2004-06-11 (26 Comments)
Solution simulations by Charlie (2004-06-17 11:12:25)
Solution The first part now, re: Now that I know... by Charlie (2004-06-17 08:51:29)
Solution Now that I know... by Charlie (2004-06-16 21:04:17)
re(5): Markov chain solution - 2nd part by Charlie (2004-06-15 13:06:13)
re: Technically Speaking by Charlie (2004-06-14 22:39:15)
Solution re: Markov chain solution - 2nd part by Charlie (2004-06-13 13:49:52)
re: Exhaustion--1st and 2nd questions--the program by Charlie (2004-06-13 11:53:37)
Solution Exhaustion--1st and 2nd questions by Charlie (2004-06-13 11:25:55)
re(3): Markov chain solution - 2nd part by Charlie (2004-06-13 10:32:10)
re: Markov chain solution - 2nd part by Charlie (2004-06-13 00:40:26)
re(2): solution by Charlie (2004-06-12 10:15:33)
Solution solution by Charlie (2004-06-11 15:50:05)
Difficulty: 3 of 5Under Another Point In A Square (in Geometry)
Posted on 2004-06-11 (16 Comments)
re: Solution - another method by Charlie (2004-06-11 13:10:59)
Solution solution by Charlie (2004-06-11 09:35:30)
Difficulty: 2 of 5Under 950 (in Tricks)
Posted on 2004-06-10 (23 Comments)
Solution a way by Charlie (2004-06-10 14:52:41)
Difficulty: 2 of 5Under Sliding Puzzle (in General)
Posted on 2004-06-10 (14 Comments)
Solution Two shortest--computer solution by Charlie (2004-06-10 09:16:39)
Difficulty: 3 of 5Under Twenty-four (in Numbers)
Posted on 2004-06-09 (8 Comments)
Solution two repeat solutions--computer-generated this time by Charlie (2004-06-09 09:49:16)
Difficulty: 3 of 5Under Random Number Generator (in Algorithms)
Posted on 2004-06-08 (26 Comments)
re(2): Implementing Thalamus's 47-bits with Brian Smith's bit-stream. by Charlie (2004-06-16 15:23:55)
Solution Implementing Thalamus's 47-bits with Brian Smith's bit-stream. by Charlie (2004-06-16 10:33:37)
re(5): solution - Charlie? by Charlie (2004-06-16 08:58:50)
re(3): solution - Charlie? by Charlie (2004-06-15 20:27:24)
re: My algorithm by Charlie (2004-06-15 10:20:28)
re: solution by Charlie (2004-06-15 09:26:49)
Solution solution by Charlie (2004-06-08 15:22:41)
Difficulty: 3 of 5Under Problematic Pathways (in General)
Posted on 2004-06-08 (8 Comments)
Solution solution by Charlie (2004-06-08 08:55:16)
Difficulty: 5 of 5Under Bird on a Wire (in Just Math)
Posted on 2004-06-07 (42 Comments)
re(5): Full solution by Charlie (2004-08-04 21:59:52)
re: Full solution by Charlie (2004-07-13 08:19:47)
re(3): Concrete Answer is (n-1)/(n+1) by Charlie (2004-06-09 11:16:34)
re: Concrete Answer is (n-1)/(n+1) by Charlie (2004-06-08 20:26:58)
re(5): Computer simulation -- CORRECTION !! by Charlie (2004-06-07 20:07:16)
Solution Almost complete by Charlie (2004-06-07 15:44:05)
re(3): Computer simulation by Charlie (2004-06-07 15:38:41)
re(2): Computer simulation by Charlie (2004-06-07 15:22:14)
Some Thoughts Computer simulation by Charlie (2004-06-07 13:56:29)
Difficulty: 2 of 5Under Double C, double T (in Word Problems)
Posted on 2004-06-07 (10 Comments)
re(3): the title taken strictly by Charlie (2004-06-07 10:25:53)
re(2): the title taken strictly by Charlie (2004-06-07 10:17:42)
the title taken strictly by Charlie (2004-06-07 09:08:02)
Difficulty: 2 of 5Under Geosynchronous Orbit (in Science)
Posted on 2004-06-05 (14 Comments)
Solution re: Impossible Orbit--to be more exact by Charlie (2004-06-05 15:16:10)
Difficulty: 3 of 5Under Fill 'Er Up! (in General)
Posted on 2004-06-03 (12 Comments)
re(2): solution - I don't think that proves the question by Charlie (2004-06-03 22:20:26)
Solution solution by Charlie (2004-06-03 14:35:15)
Difficulty: 2 of 5Under Gloves (in Numbers)
Posted on 2004-06-03 (30 Comments)
re(3): Solution? by Charlie (2004-06-03 19:30:29)
re(2): Different solution? by Charlie (2004-06-03 15:22:53)
re: Solution? by Charlie (2004-06-03 09:22:54)
Difficulty: 4 of 5Under Hexagonal Dilemma (in Geometry)
Posted on 2004-06-02 (18 Comments)
re: here goes by Charlie (2004-06-04 21:13:03)
re: No Subject by Charlie (2004-06-03 08:04:28)
Solution Excel solution by Charlie (2004-06-02 15:44:35)
Difficulty: 3 of 5Under More Bird Watching (in Tricks)
Posted on 2004-06-02 (15 Comments)
so another question can be answered by Charlie (2004-06-02 11:33:31)
Difficulty: 3 of 5Under Yet one more coin sorting problem (in Weights and Scales)
Posted on 2004-05-31 (20 Comments)
re(7): Solution based on the O-Sort sorting algorithm by Charlie (2004-06-03 22:38:11)
Question re(5): Solution based on the O-Sort sorting algorithm by Charlie (2004-06-03 13:26:56)
re(3): Solution based on the O-Sort sorting algorithm by Charlie (2004-06-02 13:57:13)
re(2): Full solution by Charlie (2004-06-02 13:48:58)
re: Solution based on the O-Sort sorting algorithm by Charlie (2004-06-02 11:22:26)
re: solution by Charlie (2004-05-31 11:28:03)
Solution solution by Charlie (2004-05-31 10:56:46)
re(2): yes no maybe by Charlie (2004-05-31 10:34:21)
Hints/Tips answer to second part by Charlie (2004-05-31 10:16:07)
Difficulty: 3 of 5Under Hexing Numbers (in Numbers)
Posted on 2004-05-30 (2 Comments)
Solution computer solution by Charlie (2004-05-30 11:41:17)
Difficulty: 3 of 5Under Square Circles (in Geometry)
Posted on 2004-05-27 (25 Comments)
re: Crossing my fingers by Charlie (2004-05-28 15:05:04)
re(3): Fewer than I thought by Charlie (2004-05-28 11:40:05)
No idea what those o:p's are by Charlie (2004-05-27 18:08:07)
Solution re: are you from Russia? by Charlie (2004-05-27 18:05:50)
re: the values by Charlie (2004-05-27 17:44:15)
Solution the values by Charlie (2004-05-27 16:01:05)
Solution re: solution by Charlie (2004-05-27 15:43:44)
Solution solution by Charlie (2004-05-27 15:26:52)
re: my old friend Pythagoras by Charlie (2004-05-27 14:42:47)
Difficulty: 3 of 5Under Moving Day (in Calculus)
Posted on 2004-05-26 (32 Comments)
re: Agreement with F.K. -- symbols not coming out too well by Charlie (2004-05-27 21:54:37)
re: Full Solution by Charlie (2004-05-26 15:55:59)
Difficulty: 3 of 5Under Ten Words (in Word Problems)
Posted on 2004-05-26 (9 Comments)
re: Solution by Charlie (2004-05-26 14:33:15)
Difficulty: 3 of 5Under The Last Diamond (in Probability)
Posted on 2004-05-25 (5 Comments)
The actual numbers (spoiler present) by Charlie (2004-05-25 08:59:04)
Solution solution by Charlie (2004-05-25 08:39:17)
Difficulty: 4 of 5Under Answer Machine Hacking (in Algorithms)
Posted on 2004-05-24 (12 Comments)
Solution Wow, got it! by Charlie (2004-05-24 14:49:11)
re: A guess by Charlie (2004-05-24 14:36:54)
Some Thoughts The shortest I can figure by Charlie (2004-05-24 14:34:13)
Difficulty: 2 of 5Under Faulty Scales (in Weights and Scales)
Posted on 2004-05-23 (8 Comments)
Solution ways by Charlie (2004-05-23 10:25:21)
Difficulty: 2 of 5Under Symmetrical words (in Word Problems)
Posted on 2004-05-21 (18 Comments)
re: Who needs a Computer search ????? by Charlie (2004-05-21 11:50:02)
Solution Computer findings. by Charlie (2004-05-21 09:48:38)
Difficulty: 3 of 5Under A Coin Game (in Probability)
Posted on 2004-05-20 (12 Comments)
Solution re: Assuming .5 solution by Charlie (2004-05-20 22:12:41)
Difficulty: 5 of 5Under Perfect Shuffle (in General)
Posted on 2004-05-19 (20 Comments)
re: there's a pattern there. I just know it! by Charlie (2004-05-25 11:46:31)
re: there's a pattern there. I just know it! by Charlie (2004-05-25 11:35:24)
re(6): Making a sequence (spoilers on the numbers) by Charlie (2004-05-21 11:41:11)
re(4): Making a sequence (spoilers on the numbers) by Charlie (2004-05-20 09:03:20)
re(2): Making a sequence (spoilers on the numbers) by Charlie (2004-05-19 21:13:59)
Some Thoughts Making a sequence (spoilers on the numbers) by Charlie (2004-05-19 15:00:18)
Difficulty: 3 of 5Under 3x3 sums (in Numbers)
Posted on 2004-05-15 (11 Comments)
re: Solution by Charlie (2004-05-15 15:47:09)
Difficulty: 3 of 5Under Set problems (in Logic)
Posted on 2004-05-12 (13 Comments)
re: not sure if i understood this correctly, but by Charlie (2004-05-12 15:15:10)
Difficulty: 3 of 5Under Powers of powers (in Calculus)
Posted on 2004-05-11 (13 Comments)
re(2): Yikes-- spoiler present by Charlie (2004-05-11 13:41:49)
Difficulty: 4 of 5Under Would you like to play a game? (in General)
Posted on 2004-05-10 (13 Comments)
re(2): Doubling case Solved by Charlie (2004-05-11 09:18:34)
Is there any way... by Charlie (2004-05-10 12:55:51)
Difficulty: 2 of 5Under Particle Acceleration (in General)
Posted on 2004-05-06 (25 Comments)
re(2): Solution by Charlie (2004-05-06 14:07:12)
Difficulty: 3 of 5Under Looking Through the Looking Glass (in Cryptography)
Posted on 2004-05-04 (12 Comments)
Some Thoughts re: Philosophy and -- spoiler by Charlie (2004-05-05 08:32:25)
thought by Charlie (2004-05-04 22:32:20)
Difficulty: 3 of 5Under Coin Collection (in Numbers)
Posted on 2004-05-04 (12 Comments)
Solution trial and error via computer by Charlie (2004-05-04 11:19:51)
Difficulty: 3 of 5Under Strange pyramid (in Geometry)
Posted on 2004-05-03 (10 Comments)
re(3): Short answer to part 1. by Charlie (2016-03-01 07:32:01)
re: Short answer to part 1. by Charlie (2016-02-29 07:44:51)
Difficulty: 4 of 5Under Monkey Business (in Just Math)
Posted on 2004-04-30 (11 Comments)
A simpler but flawed way by Charlie (2004-05-01 10:13:00)
re: solution by Charlie (2004-04-30 14:47:22)
Solution solution by Charlie (2004-04-30 14:29:03)
Difficulty: 5 of 5Under The Phrase Odd One Out (in General)
Posted on 2004-04-29 (11 Comments)
re: Anybody? by Charlie (2004-04-30 16:11:16)
Difficulty: 3 of 5Under Never prime! (in Numbers)
Posted on 2004-04-29 (12 Comments)
Solution 2nd part by Charlie (2004-04-29 11:25:55)
Difficulty: 3 of 5Under Stan's Cassette (in Shapes)
Posted on 2004-04-27 (18 Comments)
re: Overcomplicated? by Charlie (2004-04-29 13:04:21)
re: Solution by Charlie (2004-04-27 20:41:24)
Solution solution by Charlie (2004-04-27 15:46:49)
Difficulty: 5 of 5Under The Fifteen Steps (in Games)
Posted on 2004-04-26 (16 Comments)
re(2): The second part by Charlie (2004-04-27 20:50:12)
re: The second part by Charlie (2004-04-27 09:50:26)
re: Half the answer by Charlie (2004-04-27 08:35:42)
Difficulty: 3 of 5Under Pythagorean Pyramid (in Geometry)
Posted on 2004-04-26 (15 Comments)
re: Solution by Charlie (2004-04-27 09:18:39)
Question re: Solution by Charlie (2004-04-26 20:58:03)
re: Solution by Charlie (2004-04-26 20:55:42)
Solution Two ways by Charlie (2004-04-26 09:51:06)
Difficulty: 3 of 5Under 10 Sequences (in Sequences)
Posted on 2004-04-23 (10 Comments)
re: got it by Charlie (2004-04-26 15:40:42)
re: got it by Charlie (2004-04-25 12:08:27)
Difficulty: 3 of 5Under Finding the maximum (in Algorithms)
Posted on 2004-04-21 (16 Comments)
Solution programming solution by Charlie (2004-04-21 15:46:29)
Difficulty: 3 of 5Under The odd number (in Games)
Posted on 2004-04-20 (14 Comments)
re(3): strategy by Charlie (2004-04-20 20:36:11)
re(2): strategy by Charlie (2004-04-20 20:31:22)
re(2): strategy by Charlie (2004-04-20 19:46:46)
Solution strategy by Charlie (2004-04-20 15:10:56)
Difficulty: 2 of 5Under Pill Puzzler (in Logic)
Posted on 2004-04-20 (28 Comments)
re(2): Stay well by Charlie (2004-04-20 13:43:02)
Difficulty: 2 of 5Under Rotating an array (in Algorithms)
Posted on 2004-04-19 (26 Comments)
re: 10 step method by Charlie (2004-04-19 23:24:52)
Difficulty: 4 of 5Under Sneaky Joe's Craps (in Probability)
Posted on 2004-04-17 (12 Comments)
re(5): Solution by Charlie (2004-04-18 10:04:57)
re(2): Solution by Charlie (2004-04-18 00:47:53)
re: Solution by Charlie (2004-04-18 00:43:16)
Solution solution by Charlie (2004-04-17 11:59:44)
Difficulty: 3 of 5Under The many sages (in Logic)
Posted on 2004-04-13 (25 Comments)
Question re: Many Sages by Charlie (2004-04-13 14:10:09)
Question But what would happen if... by Charlie (2004-04-13 14:08:02)
Difficulty: 3 of 5Under Star Stack (in Shapes)
Posted on 2004-04-12 (19 Comments)
Solution re: Reolution ? Please? by Charlie (2007-05-20 18:11:24)
Solution solution by Charlie (2004-04-12 12:17:31)
Difficulty: 2 of 5Under Cars on the road (in Probability)
Posted on 2004-04-09 (22 Comments)
Alternative to Poisson by Charlie (2004-04-10 14:17:42)
re(3): Auto-suggestion by Charlie (2004-04-09 14:50:43)
re: Auto-suggestion by Charlie (2004-04-09 13:38:18)
Difficulty: 1 of 5Under Half Squared (in Shapes)
Posted on 2004-04-08 (13 Comments)
re(2): Variation: by Charlie (2004-04-08 11:08:44)
Difficulty: 2 of 5Under Vowel Deficit (in Word Problems)
Posted on 2004-04-07 (22 Comments)
another solution by Charlie (2004-04-07 08:56:18)
Difficulty: 2 of 5Under What are you saying? (in Cryptography)
Posted on 2004-04-05 (15 Comments)
Some Thoughts thoughts by Charlie (2004-04-05 16:26:42)
Difficulty: 2 of 5Under 2 digit Palindrome (in Numbers)
Posted on 2004-04-05 (24 Comments)
re(2): computer solution by Charlie (2004-04-05 13:56:39)
re(2): 3-digits soln by Charlie (2004-04-05 13:53:28)
3-digits soln by Charlie (2004-04-05 11:02:36)
Solution computer solution by Charlie (2004-04-05 09:04:20)
Difficulty: 3 of 5Under Disjointification (in Just Math)
Posted on 2004-04-04 (12 Comments)
Question re(3): Suggestions from Proposer by Charlie (2004-04-04 19:23:03)
Solution re: Suggestions from Proposer by Charlie (2004-04-04 13:25:50)
Some Thoughts thoughts by Charlie (2004-04-04 11:30:07)
Difficulty: 2 of 5Under Special Numbers (in Just Math)
Posted on 2004-04-03 (18 Comments)
Solution computer solution by Charlie (2004-04-03 10:34:56)
Difficulty: 3 of 5Under At the World Series (in Probability)
Posted on 2004-04-01 (7 Comments)
Solution solution by Charlie (2004-04-01 09:39:31)
Difficulty: 3 of 5Under To the moons, Alice !! (in Tricks)
Posted on 2004-03-30 (16 Comments)
Solution The possible considerations by Charlie (2004-03-30 10:54:58)
Difficulty: 3 of 5Under Birthday Line (in Probability)
Posted on 2004-03-29 (21 Comments)
re: No Subject by Charlie (2004-03-30 08:37:50)
Difficulty: 5 of 5Under The Conversing Club 3 (in General)
Posted on 2004-03-28 (63 Comments)
re: get started.....a hint by Charlie (2004-03-29 21:57:58)
Some Thoughts A more systematic approach...but still too big for the computer by Charlie (2004-03-29 16:50:08)
Difficulty: 2 of 5Under Rickety Bridge (in Liars and Knights)
Posted on 2004-03-26 (33 Comments)
re(2): Only 1 is safe to ask... by Charlie (2004-03-26 15:55:58)
Difficulty: 4 of 5Under Chords and Chords (in Geometry)
Posted on 2004-03-24 (23 Comments)
re: Answer by Charlie (2004-03-25 08:25:39)
Difficulty: 3 of 5Under Fraction Frustration (in Numbers)
Posted on 2004-03-24 (10 Comments)
re: thoughts by Charlie (2004-03-24 08:38:04)
Some Thoughts thoughts by Charlie (2004-03-24 08:35:39)
Difficulty: 3 of 5Under Squares Probability II (in Probability)
Posted on 2004-03-23 (15 Comments)
re(2): with a computer (or a table of squares) by Charlie (2004-03-23 20:58:57)
Some Thoughts with a computer (or a table of squares) by Charlie (2004-03-23 14:57:04)
Some Thoughts without a calculator by Charlie (2004-03-23 14:44:45)
Difficulty: 2 of 5Under Make a STATEment! (in General)
Posted on 2004-03-23 (13 Comments)
re(3): Tour de force by Charlie (2004-03-23 11:12:03)
Difficulty: 2 of 5Under The similar sheet (in Geometry)
Posted on 2004-03-22 (18 Comments)
re: Solution by Charlie (2004-03-22 15:21:37)
Difficulty: 3 of 5Under A dangerous compound (in Science)
Posted on 2004-03-22 (43 Comments)
re: Sorry folks, by Charlie (2004-03-22 15:26:21)
Difficulty: 3 of 5Under A square squared (in Shapes)
Posted on 2004-03-20 (5 Comments)
Solution Most of a solution by Charlie (2004-03-20 11:23:31)
Difficulty: 3 of 5Under Monkey Dance 1 (in Logic)
Posted on 2004-03-19 (34 Comments)
re(5): My solution by Charlie (2004-03-19 23:01:58)
re(4): My solution by Charlie (2004-03-19 22:57:41)
re(2): My solution by Charlie (2004-03-19 16:07:02)
Difficulty: 3 of 5Under Gamer say (in General)
Posted on 2004-03-18 (16 Comments)
re: my final answer by Charlie (2004-03-19 11:11:53)
Solution my final answer by Charlie (2004-03-19 11:00:59)
Solution solution by Charlie (2004-03-18 16:09:49)
re: it is MORE challenging that I thought by Charlie (2004-03-18 15:40:24)
Difficulty: 3 of 5Under A point in a square (in Geometry)
Posted on 2004-03-17 (7 Comments)
the other half by Charlie (2004-03-17 22:03:40)
Difficulty: 1 of 5Under The magic Number (in Numbers)
Posted on 2004-03-17 (35 Comments)
re: solution -- note by Charlie (2004-03-17 09:02:15)
re: Solution by Charlie (2004-03-17 08:48:49)
Solution solution by Charlie (2004-03-17 08:47:37)
Difficulty: 3 of 5Under Diagonal triangle sums (in Just Math)
Posted on 2004-03-15 (4 Comments)
Solution solution by Charlie (2004-03-15 14:11:08)
Difficulty: 3 of 5Under Spirit of '76 (in Just Math)
Posted on 2004-03-14 (8 Comments)
calculations provided by ... by Charlie (2004-03-14 13:59:50)
Solution more thoughts (actually solution--spoiler) by Charlie (2004-03-14 13:48:25)
Some Thoughts thoughts by Charlie (2004-03-14 12:16:18)
Difficulty: 4 of 5Under Toggler and Triggler (in Games)
Posted on 2004-03-12 (10 Comments)
Some Thoughts some findings by brute force by Charlie (2004-03-12 14:01:47)
Difficulty: 3 of 5Under Cheap Charlie (in General)
Posted on 2004-03-12 (17 Comments)
Some Thoughts Smoking is a vile habit. by Charlie (2004-03-12 10:15:04)
Difficulty: 5 of 5Under Happy Birthday (2) (in Probability)
Posted on 2004-03-11 (6 Comments)
Some Thoughts Simulations and approximation by Charlie (2004-03-11 14:10:44)
Difficulty: 2 of 5Under A to B (in Just Math)
Posted on 2004-03-10 (15 Comments)
re: Over complicated by Charlie (2004-10-10 18:59:06)
Difficulty: 3 of 5Under Ten Colors (in General)
Posted on 2004-03-05 (6 Comments)
Some Thoughts Harder than it looks at first sight. by Charlie (2004-03-05 09:41:46)
Difficulty: 5 of 5Under What is quicker than the eye? (in Science)
Posted on 2004-03-04 (15 Comments)
an interesting web page by Charlie (2004-07-03 16:47:05)
Solution My analysis by Charlie (2004-03-04 15:02:25)
Difficulty: 3 of 5Under Open By Majority (in General)
Posted on 2004-03-03 (45 Comments)
re: Revised solution to revised puzzle by Charlie (2004-03-04 12:04:18)
Difficulty: 4 of 5Under Not So Neighborly (in Numbers)
Posted on 2004-03-03 (7 Comments)
Extension in the other direction by Charlie (2004-03-03 09:50:20)
Solution Another proof--and extension. by Charlie (2004-03-03 09:07:57)
re: ELEMENTARY, DEAR WATSON by Charlie (2004-03-03 08:39:55)
Solution solution by Charlie (2004-03-03 08:37:43)
Difficulty: 3 of 5Under Packing 'em In (in Geometry)
Posted on 2004-03-02 (13 Comments)
Solution The Calculus by Charlie (2004-03-02 15:36:59)
Difficulty: 2 of 5Under e, i, and π (in Just Math)
Posted on 2004-03-02 (12 Comments)
re: too easy for this site by Charlie (2004-03-02 13:30:16)
re(2): solution by Charlie (2004-03-02 13:20:42)
Solution solution by Charlie (2004-03-02 09:08:39)
Difficulty: 2 of 5Under Move the 3, Triple the number (in Numbers)
Posted on 2004-03-01 (17 Comments)
re(4): Standard solution by Charlie (2004-03-02 15:46:41)
Solution re(2): Standard solution by Charlie (2004-03-02 08:34:50)
re: another method--computer-assisted by Charlie (2004-03-01 10:49:02)
Solution another method--computer-assisted by Charlie (2004-03-01 10:44:05)
Difficulty: 3 of 5Under N-Divisibility (in Numbers)
Posted on 2004-02-29 (4 Comments)
Solution solution by Charlie (2004-02-29 11:24:09)
Difficulty: 3 of 5Under Chess Board Switch (in General)
Posted on 2004-02-28 (15 Comments)
re: Solution1 by Charlie (2004-02-29 10:14:44)
Difficulty: 4 of 5Under Like Clockwork (in Geometry)
Posted on 2004-02-27 (34 Comments)
re(3): Spreadsheet solution. by Charlie (2004-02-27 17:11:02)
re: Spreadsheet solution. by Charlie (2004-02-27 14:46:17)
Solution Spreadsheet solution. by Charlie (2004-02-27 14:43:07)
Difficulty: 3 of 5Under The not-always-lying politician (in General)
Posted on 2004-02-27 (20 Comments)
re: Fibo again by Charlie (2004-02-27 11:03:24)
Solution solution by Charlie (2004-02-27 08:52:09)
Difficulty: 4 of 5Under trigonometry and a triangle (in Just Math)
Posted on 2004-02-26 (15 Comments)
re(2): solution by Charlie (2004-02-27 07:22:17)
Difficulty: 4 of 5Under B-Palindromes (in Numbers)
Posted on 2004-02-25 (11 Comments)
re: A solution -- oh, I see by Charlie (2004-02-25 15:43:50)
Solution A solution by Charlie (2004-02-25 15:35:30)
Difficulty: 3 of 5Under The pencil (in Geometry)
Posted on 2004-02-23 (16 Comments)
re(4): Trying to be even more exact by Charlie (2004-02-24 10:53:25)
re: Trying to be even more exact by Charlie (2004-02-24 08:21:02)
Solution Trying to be exact. by Charlie (2004-02-23 15:29:48)
Difficulty: 3 of 5Under Lines on the Curve (in Geometry)
Posted on 2004-02-23 (5 Comments)
re: Complete Solution by Charlie (2004-02-24 08:56:03)
Solution solution by Charlie (2004-02-23 08:33:34)
Difficulty: 4 of 5Under Trapped! (in Geometry)
Posted on 2004-02-19 (9 Comments)
Solution a proof by Charlie (2004-02-19 14:17:56)
Difficulty: 3 of 5Under The Black Hole (in Just Math)
Posted on 2004-02-18 (13 Comments)
Hints/Tips no proof, but... by Charlie (2004-02-18 10:48:01)
Difficulty: 3 of 5Under The strange clock (in Logic)
Posted on 2004-02-17 (13 Comments)
re(3): Solution by Charlie (2004-02-18 15:31:10)
Solution solution by Charlie (2004-02-17 11:46:54)
Difficulty: 3 of 5Under Total Toothpaste (in General)
Posted on 2004-02-16 (5 Comments)
Solution The 4-zone case laid out by Charlie (2004-02-17 08:41:23)
Some Thoughts Heuristic method by Charlie (2004-02-16 15:25:16)
Difficulty: 4 of 5Under West Side Story (in Numbers)
Posted on 2004-02-15 (8 Comments)
re(2): Solution by Charlie (2004-02-15 15:18:08)
Solution Solution by Charlie (2004-02-15 10:34:43)
Difficulty: 3 of 5Under Letters to numbers (in Cryptography)
Posted on 2004-02-13 (36 Comments)
re(4): Interesting Idea: by Charlie (2004-02-16 20:39:04)
re(2): Interesting Idea: by Charlie (2004-02-16 10:08:25)
Difficulty: 4 of 5Under Triple Negative (in Logic)
Posted on 2004-02-12 (19 Comments)
Solution So... by Charlie (2004-02-14 11:19:13)
Some Thoughts Of course you could do this by Charlie (2004-02-13 13:52:11)
re: Circuits acrobatics !! (Solution)-- does not scale up. by Charlie (2004-02-13 11:21:31)
Difficulty: 2 of 5Under The three squirrels (in Numbers)
Posted on 2004-02-12 (12 Comments)
Solution re: Acorns ... because by Charlie (2004-02-12 10:05:43)
Difficulty: 4 of 5Under Domino Chain (in Probability)
Posted on 2004-02-11 (19 Comments)
re: we were all wrong by Charlie (2004-02-14 19:54:01)
re(6): solution :-) by Charlie (2004-02-12 14:06:40)
re(4): solution :-) by Charlie (2004-02-12 08:39:37)
re: solution :-) by Charlie (2004-02-11 17:52:55)
Difficulty: 3 of 5Under Set Me Up (in Numbers)
Posted on 2004-02-10 (31 Comments)
re(5): Solution FINAL WORD(by Charlie by Charlie (2004-02-10 15:58:42)
re(4): Solution FINAL WORD(by Charlie by Charlie (2004-02-10 15:53:24)
re(2): Solution FINAL WORD by Charlie (2004-02-10 13:30:02)
re(2): Solution - not yet? by Charlie (2004-02-10 13:24:41)
re(3): my solution by Charlie (2004-02-10 11:07:22)
re(2): solution by Charlie (2004-02-10 11:00:46)
re: my solution by Charlie (2004-02-10 10:52:08)
Solution solution by Charlie (2004-02-10 10:45:08)
Difficulty: 4 of 5Under The Random Problem (in Probability)
Posted on 2004-02-09 (8 Comments)
Solution solution by Charlie (2004-02-09 12:28:05)
Difficulty: 2 of 5Under Sphere Cube (in Geometry)
Posted on 2004-02-09 (16 Comments)
re: Different Sulution by Charlie (2004-02-09 11:19:57)
Difficulty: 3 of 5Under Ascension (in Word Problems)
Posted on 2004-02-08 (24 Comments)
re(2): trivia ... more by Charlie (2004-02-14 11:00:37)
re(2): Computer Used by Charlie (2004-02-08 16:00:32)
Solution re: Computer Used--BTW, the full output by Charlie (2004-02-08 11:17:15)
Solution Computer Used by Charlie (2004-02-08 11:09:34)
Difficulty: 3 of 5Under The Conversing Club 2 (in General)
Posted on 2004-02-06 (5 Comments)
Solution re: solution -- the simple way by Charlie (2004-02-06 13:42:18)
Solution solution by Charlie (2004-02-06 13:09:23)
Difficulty: 4 of 5Under Cubic AND Quartic Challenge (in Numbers)
Posted on 2004-02-06 (16 Comments)
Solution solution by Charlie (2004-02-06 09:30:25)
Difficulty: 2 of 5Under Two Packs Of Cards (in Probability)
Posted on 2004-02-05 (16 Comments)
re: Agreement with nobody by Charlie (2004-02-06 14:20:34)
Solution re: Solution by Charlie (2004-02-05 08:43:55)
Difficulty: 3 of 5Under A Boy, a Girl, a Dog, and a Bicycle (in General)
Posted on 2004-02-03 (26 Comments)
Some Thoughts Theoretical minimum that can't be done logistically. by Charlie (2004-02-03 13:40:35)
Difficulty: 2 of 5Under The Prime Club (in Liars and Knights)
Posted on 2004-02-03 (11 Comments)
re: Solution by Charlie (2004-02-03 10:27:09)
Difficulty: 3 of 5Under Unit Cubes (in Shapes)
Posted on 2004-02-02 (16 Comments)
re(3): Extension (A deeper question) by Charlie (2004-02-05 10:35:26)
re: solution to problem by Charlie (2004-02-03 08:54:17)
Solution Another way of looking at it. by Charlie (2004-02-02 14:45:36)
Difficulty: 2 of 5Under Diagonals Of A Polygon (in Just Math)
Posted on 2004-01-31 (17 Comments)
re: Common sense by Charlie (2004-01-31 13:50:59)
Difficulty: 2 of 5Under The glass balls (in General)
Posted on 2004-01-30 (5 Comments)
Solution Solution by Charlie (2004-01-30 14:37:03)
Difficulty: 3 of 5Under Superimposition (in General)
Posted on 2004-01-30 (10 Comments)
Solution solution by Charlie (2004-01-30 09:39:00)
Difficulty: 4 of 5Under Through the Looking Glass (in Science)
Posted on 2004-01-29 (13 Comments)
Solution solution by Charlie (2004-01-29 16:00:52)
Difficulty: 3 of 5Under Thirty two barbarians (in General)
Posted on 2004-01-28 (35 Comments)
Question huh? by Charlie (2004-01-28 22:10:44)
Some Thoughts a start by Charlie (2004-01-28 15:02:06)
re(2): Upper bound (lower bound?) by Charlie (2004-01-28 14:51:17)
Difficulty: 2 of 5Under Game of luck (in Probability)
Posted on 2004-01-27 (23 Comments)
re(6): another remark to SK 'S solution by Charlie (2004-02-01 12:06:36)
re(4): another remark to SK 'S solution by Charlie (2004-01-31 14:09:22)
re(2): another remark to SK 'S solution by Charlie (2004-01-31 11:53:51)
re: another remark to SK 'S solution by Charlie (2004-01-31 11:50:33)
re(2): Charlie's solution by Charlie (2004-01-27 14:19:19)
Solution re: solution -- on second thought by Charlie (2004-01-27 14:14:29)
Solution solution by Charlie (2004-01-27 13:41:23)
Difficulty: 4 of 5Under On Average (in Probability)
Posted on 2004-01-26 (11 Comments)
re(2): solution by Charlie (2004-01-26 23:04:56)
re: The other answers by Charlie (2004-01-26 22:44:38)
The other answers by Charlie (2004-01-26 17:28:13)
re(2): solution plus simulation-- and another question or two by Charlie (2004-01-26 14:58:49)
solution plus simulation-- and another question or two by Charlie (2004-01-26 14:02:07)
Difficulty: 1 of 5Under Alphanumeric Ambiguity (in Word Problems)
Posted on 2004-01-26 (15 Comments)
re: More solution(s) by Charlie (2023-04-26 11:05:41)
But it could also be... by Charlie (2004-01-26 09:36:17)
Difficulty: 3 of 5Under A Boy, a Girl, and a Dog (in General)
Posted on 2004-01-24 (16 Comments)
Some Thoughts thoughts by Charlie (2004-01-24 14:34:48)
Difficulty: 3 of 5Under Truncated Cone (in Shapes)
Posted on 2004-01-23 (10 Comments)
solution by Charlie (2004-01-23 12:14:20)
Difficulty: 3 of 5Under Last Digit (in Just Math)
Posted on 2004-01-23 (21 Comments)
re(3): solution by Charlie (2004-01-23 10:38:36)
re(2): solution --- Gosh!!!.. by Charlie (2004-01-23 10:22:38)
re: solution by Charlie (2004-01-23 10:07:55)
Difficulty: 4 of 5Under Three Bugs (in Shapes)
Posted on 2004-01-22 (16 Comments)
re: There must be some bugs in this solution !!! by Charlie (2004-01-23 00:40:34)
re(2): There must be some bugs in this solution !!! by Charlie (2004-01-22 17:46:55)
Solution re: solution by Charlie (2004-01-22 14:59:13)
Solution solution by Charlie (2004-01-22 14:54:39)
Difficulty: 3 of 5Under e pluribus unum ii (in Numbers)
Posted on 2004-01-22 (13 Comments)
re: solution :-) -- There's also... (variations) by Charlie (2004-01-22 14:37:37)
re: an error in your DATA by Charlie (2004-01-22 13:19:05)
Some Thoughts re: Attempt at a computer solution -- results by Charlie (2004-01-22 11:32:29)
Some Thoughts Attempt at a computer solution by Charlie (2004-01-22 11:21:33)
Difficulty: 2 of 5Under Square challenge (in Numbers)
Posted on 2004-01-20 (16 Comments)
re: solution and bonus answer by Charlie (2009-01-26 18:12:02)
Difficulty: 4 of 5Under A Better Mousetrap (in General)
Posted on 2004-01-20 (12 Comments)
Some Thoughts 2/3 of an answer by Charlie (2004-01-20 09:09:16)
Difficulty: 3 of 5Under Extraterrestrial primes (in Numbers)
Posted on 2004-01-19 (7 Comments)
Solution No Subject by Charlie (2004-01-19 14:21:12)
Difficulty: 3 of 5Under Sorting Coins (in Weights and Scales)
Posted on 2004-01-18 (11 Comments)
Some Thoughts worst case & information theoretic by Charlie (2004-01-18 12:34:11)
Difficulty: 3 of 5Under Three problems (in Just Math)
Posted on 2004-01-16 (3 Comments)
Solution solution by Charlie (2004-01-16 10:34:12)
Difficulty: 3 of 5Under Word Ladder Construction (in Algorithms)
Posted on 2004-01-15 (7 Comments)
re: I think this pseudocode will do it by Charlie (2004-01-23 14:07:48)
re: can someone review this by Charlie (2004-01-15 21:13:41)
Difficulty: 3 of 5Under Chessboard (in Probability)
Posted on 2004-01-14 (20 Comments)
re: grammar by Charlie (2004-02-07 22:20:18)
re: Chessboard by Charlie (2004-01-24 10:11:43)
Solution solution by Charlie (2004-01-14 15:43:24)
Difficulty: 4 of 5Under What Can You Prove? (in Geometry)
Posted on 2004-01-14 (8 Comments)
Solution solution by Charlie (2004-01-14 09:15:28)
Difficulty: 2 of 5Under Circle Square (in Geometry)
Posted on 2004-01-13 (15 Comments)
Solution solution by Charlie (2004-01-13 09:27:05)
Difficulty: 4 of 5Under Mix and Match (in Word Problems)
Posted on 2004-01-12 (7 Comments)
re: some more ! by Charlie (2004-01-13 13:06:49)
Difficulty: 3 of 5Under ETW (in Word Problems)
Posted on 2004-01-09 (15 Comments)
for 2 by Charlie (2004-01-09 10:29:17)
Difficulty: 3 of 5Under Three Sequences (in Sequences)
Posted on 2004-01-06 (9 Comments)
re: question by Charlie (2004-01-07 09:13:53)
Difficulty: 3 of 5Under Divisibility (in Just Math)
Posted on 2004-01-06 (11 Comments)
re(2): Solution by Charlie (2004-01-06 13:18:15)
Difficulty: 4 of 5Under Pack the Box (in Shapes)
Posted on 2004-01-04 (6 Comments)
Question How many solutions? by Charlie (2004-01-05 09:26:12)
Solution solution by Charlie (2004-01-04 20:17:38)
Difficulty: 4 of 5Under Stay in Form (in General)
Posted on 2004-01-03 (9 Comments)
Solution I get... by Charlie (2004-01-03 14:58:17)
Difficulty: 2 of 5Under Swap (in Algorithms)
Posted on 2004-01-02 (11 Comments)
Solution other solutions by Charlie (2004-01-02 17:03:48)
Difficulty: 3 of 5Under The Rebel (in Logic)
Posted on 2004-01-01 (18 Comments)
re(2): answer (Some justification) by Charlie (2004-01-01 14:02:30)
Difficulty: 3 of 5Under a game of chance (in Probability)
Posted on 2003-12-31 (3 Comments)
Solution solution by Charlie (2003-12-31 15:33:08)
Difficulty: 3 of 5Under Power - ful (in Just Math)
Posted on 2003-12-31 (11 Comments)
re: by Charlie (2003-12-31 10:58:39)
Solution solution by Charlie (2003-12-31 10:35:24)
Difficulty: 3 of 5Under Simple Math? (in General)
Posted on 2003-12-30 (13 Comments)
Solution solution by Charlie (2003-12-30 15:35:27)
Difficulty: 4 of 5Under The Conversing Club (in General)
Posted on 2003-12-29 (6 Comments)
re(2): solution--computer used by Charlie (2003-12-30 11:30:23)
re: solution--computer used by Charlie (2003-12-30 11:03:34)
Solution solution--computer used by Charlie (2003-12-30 10:56:46)
re: Solution (no computer program used) by Charlie (2003-12-30 10:22:35)
Difficulty: 3 of 5Under Square Clues (in Numbers)
Posted on 2003-12-29 (5 Comments)
Solution solution--computer used by Charlie (2003-12-29 10:42:54)
Difficulty: 3 of 5Under Different Digits (in Numbers)
Posted on 2003-12-28 (15 Comments)
re(4): Solution by Charlie (2003-12-28 16:01:05)
re: Solution by Charlie (2003-12-28 10:15:20)
Difficulty: 4 of 5Under Annul Choke Widow Nude Whist (in Word Problems)
Posted on 2003-12-27 (8 Comments)
re(2): Solution? by Charlie (2003-12-27 15:37:16)
Difficulty: 3 of 5Under Quiz Quandary (in Probability)
Posted on 2003-12-26 (14 Comments)
re: Markov chains by Charlie (2003-12-27 09:32:25)
re: Solution (only a common calculator used) by Charlie (2003-12-26 22:36:38)
re: Depends... by Charlie (2003-12-26 15:02:42)
Solution Depends... by Charlie (2003-12-26 14:49:56)
Difficulty: 3 of 5Under English Word (in Word Problems)
Posted on 2003-12-26 (10 Comments)
Solution the computer finds by Charlie (2003-12-26 12:02:59)
Difficulty: 4 of 5Under Prime real estate (in Sequences)
Posted on 2003-12-24 (7 Comments)
informal indication by Charlie (2003-12-24 15:54:34)
Difficulty: 4 of 5Under Numbers and Dots (in Numbers)
Posted on 2003-12-24 (13 Comments)
Solution re(2): even closer... by Charlie (2003-12-25 01:37:02)
re: even closer... by Charlie (2003-12-24 16:17:47)
Some Thoughts thoughts by Charlie (2003-12-24 08:55:29)
Difficulty: 3 of 5Under Puzzle Strips 2 (in Numbers)
Posted on 2003-12-22 (4 Comments)
re: One Solution -- verification of uniqueness by Charlie (2003-12-22 18:52:44)
Difficulty: 4 of 5Under Non - Zero Digit (in Just Math)
Posted on 2003-12-21 (11 Comments)
re: Seems Simple by Charlie (2003-12-22 14:25:13)
re(2): simple solution by Charlie (2003-12-22 08:46:01)
re: simple solution by Charlie (2003-12-22 08:43:51)
Solution solution by Charlie (2003-12-21 17:11:33)
Difficulty: 5 of 5Under Spheres in 4-D (in Calculus)
Posted on 2003-12-20 (7 Comments)
re: Answer is Calculus by Charlie (2003-12-28 11:19:08)
Solution solution by Charlie (2003-12-20 14:10:20)
Difficulty: 5 of 5Under Square Sequence (in Sequences)
Posted on 2003-12-19 (10 Comments)
Solution proof by Charlie (2003-12-19 16:33:44)
Difficulty: 3 of 5Under Lost my pointer 2 (in Algorithms)
Posted on 2003-12-18 (22 Comments)
Question re(2): Racing around by Charlie (2003-12-18 22:26:40)
re: I don't understand the definition of a by Charlie (2003-12-18 15:55:10)
Solution a solution by Charlie (2003-12-18 15:45:49)
Difficulty: 3 of 5Under Equilateral Triangle (in Geometry)
Posted on 2003-12-18 (21 Comments)
Solution If ... (an alternate question) by Charlie (2003-12-18 10:18:46)
Solution Excel solution by Charlie (2003-12-18 09:09:41)
Difficulty: 3 of 5Under Flat Out (in General)
Posted on 2003-12-17 (24 Comments)
re(3): is 4 not ok ?? by Charlie (2003-12-29 14:11:05)
re: is 4 not ok ?? by Charlie (2003-12-27 09:33:53)
re: pennies by Charlie (2003-12-20 14:16:40)
re: Isn't this kind of easy? by Charlie (2003-12-18 08:13:25)
Difficulty: 4 of 5Under Words In Common 10 (in Word Problems)
Posted on 2003-12-15 (17 Comments)
re(3): Added answers by Charlie (2003-12-16 09:56:17)
re: Added answers by Charlie (2003-12-15 23:07:13)
Question Added question. by Charlie (2003-12-15 20:54:38)
Difficulty: 3 of 5Under Another Race (in Liars and Knights)
Posted on 2003-12-15 (9 Comments)
... and the computer way. by Charlie (2003-12-15 09:28:25)
Solution solution by Charlie (2003-12-15 09:22:05)
Difficulty: 3 of 5Under Shapely Figures (in Sequences)
Posted on 2003-12-12 (10 Comments)
Solution ... and of course by Charlie (2003-12-12 12:12:28)
Difficulty: 3 of 5Under Shortest distance (in Shapes)
Posted on 2003-12-10 (16 Comments)
re(2): Solution (details) by Charlie (2003-12-10 16:10:10)
Solution re(2): Solution (details) by Charlie (2003-12-10 15:57:25)
Difficulty: 3 of 5Under How it Started (Eve Did Talk) (in Word Problems)
Posted on 2003-12-10 (26 Comments)
re(3): Solution--not unique (computer program used this time) by Charlie (2003-12-10 13:19:44)
re(2): Solution--not unique (computer program used this time) by Charlie (2003-12-10 11:35:46)
Solution re: Solution--not unique (computer program used this time) by Charlie (2003-12-10 11:29:39)
Solution Solution (no computer program used) by Charlie (2003-12-10 09:56:19)
Difficulty: 2 of 5Under The Ladder (in Just Math)
Posted on 2003-12-09 (20 Comments)
re: solution by Charlie (2003-12-09 11:48:29)
re(2): solution by Charlie (2003-12-09 11:44:03)
Difficulty: 5 of 5Under I've a broken stick (in Probability)
Posted on 2003-12-07 (27 Comments)
re: I think this is a solution by Charlie (2003-12-10 14:03:03)
re(4): help me! correction by Charlie (2003-12-08 10:01:12)
re: solution by Charlie (2003-12-07 17:43:03)
Solution solution by Charlie (2003-12-07 14:42:19)
Difficulty: 2 of 5Under Squares and Cubes (in Numbers)
Posted on 2003-12-06 (21 Comments)
re(2): And after that there's... by Charlie (2003-12-06 22:46:42)
re: Nontrivial Implied by Charlie (2003-12-06 13:52:06)
Solution And after that there's... by Charlie (2003-12-06 11:22:41)
Difficulty: 5 of 5Under PGKKW XIMAF TNEGA NFYGZ TMUIV (in Cryptography)
Posted on 2003-12-05 (20 Comments)
re(2): the actual decryption -- except by Charlie (2003-12-10 09:02:17)
re(2): Solution by Charlie (2003-12-08 15:46:49)
re: Some Thoughts by Charlie (2003-12-06 00:44:10)
Difficulty: 2 of 5Under A horse's rope (in Shapes)
Posted on 2003-12-05 (8 Comments)
Solution solution by Charlie (2003-12-05 11:25:56)
Difficulty: 5 of 5Under Odd soccer ball (in Shapes)
Posted on 2003-12-04 (5 Comments)
Solution solution by Charlie (2003-12-04 16:31:53)
Difficulty: 3 of 5Under Piece o' Cake (in Geometry)
Posted on 2003-12-04 (22 Comments)
Solution solution by Charlie (2003-12-04 10:57:38)
re: Thoughts by Charlie (2003-12-04 09:16:40)
Some Thoughts Thoughts by Charlie (2003-12-04 09:07:02)
re: Three cuts by Charlie (2003-12-04 08:50:24)
Difficulty: 4 of 5Under Tricky Triangle (in Numbers)
Posted on 2003-12-03 (15 Comments)
Solution re(2): Multiple solutions.--down to two by Charlie (2003-12-03 14:12:03)
Solution Multiple solutions. by Charlie (2003-12-03 10:27:56)
Difficulty: 4 of 5Under Alphabet Soup (in Word Problems)
Posted on 2003-12-02 (15 Comments)
re: And another couple of solutions + variants by Charlie (2003-12-02 15:37:27)
Solution And another couple of solutions + variants by Charlie (2003-12-02 15:16:52)
Difficulty: 2 of 5Under House Numbers (in Numbers)
Posted on 2003-12-02 (14 Comments)
Solution Are these them? by Charlie (2003-12-02 10:36:36)
Difficulty: 4 of 5Under The Amazing Stamp (in Geometry)
Posted on 2003-12-01 (45 Comments)
re(2): Solution by Charlie (2003-12-03 14:32:02)
re(4): alteration by Charlie (2003-12-03 09:00:09)
Question re(5): alternation implies 1-1 by Charlie (2003-12-03 08:46:51)
re(2): by Charlie (2003-12-02 08:57:43)
Some Thoughts thoughts by Charlie (2003-12-01 13:58:24)
Difficulty: 2 of 5Under 1724362623 332826 (in Cryptography)
Posted on 2003-12-01 (19 Comments)
Solution re(3): FULL SOLUTION (No computer program used) by Charlie (2003-12-03 10:47:14)
Solution re: FULL SOLUTION (No computer program used) by Charlie (2003-12-03 08:53:37)
Difficulty: 3 of 5Under Flawless Series? (in Sequences)
Posted on 2003-11-29 (93 Comments)
re: Real Answer by Charlie (2003-11-30 17:48:38)
re(2): Explain... by Charlie (2003-11-30 15:26:44)
re: Explain... by Charlie (2003-11-30 15:22:37)
Solution In fact... (another solution) by Charlie (2003-11-30 11:16:54)
Difficulty: 5 of 5Under Relativistic bullet (in Science)
Posted on 2003-11-28 (20 Comments)
Solution solution by Charlie (2003-11-28 19:37:18)
Difficulty: 3 of 5Under Burger Buddies (in Liars and Knights)
Posted on 2003-11-27 (19 Comments)
re(2): Change: by Charlie (2003-11-28 19:42:26)
Solution re: A consistent set--confirmation -- 3 Solutions by Charlie (2003-11-28 01:39:27)
Some Thoughts A consistent set by Charlie (2003-11-28 00:47:02)
Difficulty: 4 of 5Under The Powers that Be (in Just Math)
Posted on 2003-11-25 (21 Comments)
What's a complex number? by Charlie (2003-11-26 08:11:21)
Solution solution by Charlie (2003-11-25 13:56:11)
Difficulty: 3 of 5Under Spider and Fly (in Probability)
Posted on 2003-11-25 (21 Comments)
re(2): simpler computation by Charlie (2003-11-25 10:36:38)
Solution simpler computation by Charlie (2003-11-25 09:58:41)
Difficulty: 3 of 5Under Bull's eye! (in Shapes)
Posted on 2003-11-22 (17 Comments)
re(4): The objective of the problem by Charlie (2003-11-24 14:21:34)
Solution A Basic language numerical solution by Charlie (2003-11-23 23:03:32)
Solution of one case described by Charlie (2003-11-23 20:27:25)
re: solution (solved numerically) -- verified by Charlie (2003-11-23 12:07:20)
Difficulty: 4 of 5Under Cutting Corners (in Shapes)
Posted on 2003-11-20 (16 Comments)
Another possibility--being picky. by Charlie (2003-11-20 15:45:07)
Difficulty: 4 of 5Under Three of a Kind (in Probability)
Posted on 2003-11-19 (39 Comments)
Solution Described for One Case by Charlie (2003-11-23 22:25:55)
Notes on the solution by Charlie (2003-11-21 16:04:16)
Solution Analytic Solution:Computer aided for computations by Charlie (2003-11-21 15:58:44)
re(3): A non-poker solution (computer program not used) by Charlie (2003-11-20 22:48:04)
re(2): A non-poker solution (computer program not used) by Charlie (2003-11-20 22:43:55)
re: A non-poker solution (computer program not used) by Charlie (2003-11-20 22:36:38)
2-deck simulation by Charlie (2003-11-19 17:34:52)
Adding Median and Mean to simulation by Charlie (2003-11-19 17:21:29)
Hints/Tips simulation by Charlie (2003-11-19 16:25:47)
Difficulty: 4 of 5Under Norse Code (in Word Problems)
Posted on 2003-11-18 (16 Comments)
Some Thoughts the words by Charlie (2003-11-19 15:30:16)
thoughts by Charlie (2003-11-18 16:08:24)
Difficulty: 3 of 5Under Wrong Place, Right Place (in Logic)
Posted on 2003-11-17 (35 Comments)
re(3): Dear Silver Kinght and Charlie,,,,, by Charlie (2003-11-18 13:24:48)
Solution In Basic by Charlie (2003-11-18 09:40:19)
Difficulty: 3 of 5Under Three numbers (in Just Math)
Posted on 2003-11-17 (22 Comments)
re(4): another solution by Charlie (2003-11-18 21:28:07)
re(2): another solution by Charlie (2003-11-18 21:00:40)
Solution solution by Charlie (2003-11-17 15:31:51)
re: a starting shot... by Charlie (2003-11-17 14:15:32)
Difficulty: 3 of 5Under Secret Message (in Cryptography)
Posted on 2003-11-16 (22 Comments)
Question which one or both? by Charlie (2003-11-16 10:46:17)
Difficulty: 3 of 5Under 50 - Digit Number (in Just Math)
Posted on 2003-11-15 (43 Comments)
re: A similar problem but perhaps a bit trickier by Charlie (2003-11-20 14:59:49)
Solution Less thinking using extended precision by Charlie (2003-11-15 11:46:40)
Solution solution by Charlie (2003-11-15 11:32:16)
Difficulty: 3 of 5Under Circle in hypotenuse (in Geometry)
Posted on 2003-11-14 (13 Comments)
Solution another way by Charlie (2003-11-14 15:55:04)
Difficulty: 3 of 5Under Double Cross (in Word Problems)
Posted on 2003-11-14 (7 Comments)
re: Solutions--another possibility by Charlie (2003-11-14 09:10:32)
Difficulty: 4 of 5Under Two Boats and A River (in Just Math)
Posted on 2003-11-13 (14 Comments)
Solution solution by Charlie (2003-11-13 14:53:18)
Difficulty: 3 of 5Under Getting Sheepish (in Shapes)
Posted on 2003-11-12 (10 Comments)
re: Solution by Charlie (2003-11-15 22:09:39)
Solution In generality--not assuming one case by Charlie (2003-11-12 15:12:18)
Difficulty: 4 of 5Under Magic Rods (in Logic)
Posted on 2003-11-11 (14 Comments)
Solution The top number? by Charlie (2003-11-11 15:40:32)
Difficulty: 2 of 5Under An Egg-celent Question (in Numbers)
Posted on 2003-11-11 (12 Comments)
That was the answer; this is the solution by Charlie (2003-11-11 10:25:43)
Difficulty: 3 of 5Under Your Ducky Number (in Numbers)
Posted on 2003-11-07 (14 Comments)
re: Solution by Charlie (2003-11-07 11:23:44)
Solution solution by Charlie (2003-11-07 10:20:42)
Difficulty: 3 of 5Under Girls Just Wanna Have Fun (in Logic)
Posted on 2003-11-06 (37 Comments)
re: Solution: by Charlie (2003-11-08 14:18:00)
re: Each shirt purchased twice by Charlie (2003-11-08 09:30:42)
re: Each shirt purchased twice by Charlie (2003-11-07 21:18:54)
re: Solution (maybe) by Charlie (2003-11-07 16:33:42)
re: Perhaps... by Charlie (2003-11-07 16:25:31)
Solution 21 solutions?--brute force by Charlie (2003-11-07 15:43:05)
Difficulty: 3 of 5Under 5, 6, Pick Up Sticks (in Probability)
Posted on 2003-11-05 (13 Comments)
Solution Second Part by Charlie (2003-11-05 15:30:46)
re: Quick partial answer by Charlie (2003-11-05 14:45:12)
Difficulty: 3 of 5Under Words in Common 9 (in Word Problems)
Posted on 2003-11-03 (17 Comments)
re(3): We can do better than this..... by Charlie (2003-11-06 12:09:13)
re(4): Solution by Charlie (2003-11-04 10:31:44)
re(3): Solution by Charlie (2003-11-03 20:33:51)
re(2): Solution by Charlie (2003-11-03 20:30:23)
Difficulty: 3 of 5Under Fair and Square (in Numbers)
Posted on 2003-11-03 (25 Comments)
re: Fuller Solution by Charlie (2003-11-03 22:09:37)
re: solution by Charlie (2003-11-03 10:54:27)
Difficulty: 4 of 5Under Lights Out! (in General)
Posted on 2003-11-02 (27 Comments)
re: Lights On! by Charlie (2003-11-06 17:29:55)
re(3): Brute Force by Charlie (2003-11-04 00:39:10)
re(2): Brute Force by Charlie (2003-11-03 23:18:07)
Solution re: Brute Force by Charlie (2003-11-02 20:29:10)
re(2): Brute Force by Charlie (2003-11-02 20:19:59)
Solution Brute Force by Charlie (2003-11-02 18:01:31)
Difficulty: 3 of 5Under On the house? (in Paradoxes)
Posted on 2003-10-31 (25 Comments)
re(2): W00t by Charlie (2003-11-06 19:41:35)
Solution solution by Charlie (2003-10-31 09:50:53)
Difficulty: 4 of 5Under Tiger - Man (in General)
Posted on 2003-10-29 (15 Comments)
Solution Specifically... by Charlie (2003-10-29 16:09:12)
Difficulty: 4 of 5Under Blargs, Grots and Cloystas (in Liars and Knights)
Posted on 2003-10-28 (26 Comments)
re: Solution by Charlie (2003-10-28 17:11:05)
re: some guesses by Charlie (2003-10-28 17:04:26)
Difficulty: 3 of 5Under Pizza Cut (in Just Math)
Posted on 2003-10-27 (15 Comments)
re(4): full solution by Charlie (2003-10-27 15:48:39)
re(2): full solution by Charlie (2003-10-27 15:26:49)
Difficulty: 3 of 5Under Puzzle Strips (in Numbers)
Posted on 2003-10-27 (7 Comments)
re: full solution by Charlie (2003-10-27 09:16:00)
Solution To be specific by Charlie (2003-10-27 09:13:58)
Difficulty: 4 of 5Under Prime sequence (in Numbers)
Posted on 2003-10-23 (14 Comments)
re: 22 terms by Charlie (2003-10-23 14:45:16)
Difficulty: 4 of 5Under That's a Load of Craps! (in Probability)
Posted on 2003-10-22 (13 Comments)
re(2): some thoughts...and a question by Charlie (2003-10-23 08:12:46)
Solution re: some thoughts by Charlie (2003-10-22 13:40:12)
Difficulty: 2 of 5Under Summer Vacation (in Riddles)
Posted on 2003-10-22 (41 Comments)
re: Are you sure what these geographic points are ? by Charlie (2003-10-22 09:38:19)
re: Possible solution by Charlie (2003-10-22 09:00:09)
Difficulty: 4 of 5Under Four Tangent Circles (in Shapes)
Posted on 2003-10-20 (13 Comments)
Solution Spreadsheet solution by Charlie (2003-10-21 10:35:16)
Difficulty: 3 of 5Under Square thinking (in Probability)
Posted on 2003-10-19 (12 Comments)
re: solution by Charlie (2003-10-19 19:22:41)
Solution solution by Charlie (2003-10-19 13:26:40)
Difficulty: 4 of 5Under Hello Operator (in Just Math)
Posted on 2003-10-17 (19 Comments)
re(2): A simple solution by Charlie (2003-10-19 13:25:13)
Solution another way to describe it by Charlie (2003-10-17 15:07:18)
Difficulty: 2 of 5Under Word Builder 1 (in Word Problems)
Posted on 2003-10-17 (7 Comments)
Solution 11,929 solutions by Charlie (2003-10-17 11:47:18)
Difficulty: 3 of 5Under Remainder (in Just Math)
Posted on 2003-10-16 (10 Comments)
Hints/Tips re: By inspection... by Charlie (2003-10-16 09:52:36)
Difficulty: 3 of 5Under Easy as 1 2 3 (in Probability)
Posted on 2003-10-15 (9 Comments)
re: Solution provisions by Charlie (2003-10-20 11:41:08)
Simulation of differing distribution by Charlie (2003-10-16 09:33:12)
re: The Price Is Right by Charlie (2003-10-16 08:52:08)
Different distribution(s) by Charlie (2003-10-15 22:18:06)
Difficulty: 5 of 5Under Cigarette Bar Bet (in Science)
Posted on 2003-10-15 (86 Comments)
re: Am I being thick by Charlie (2004-03-17 08:21:39)
Difficulty: 3 of 5Under An Odd Pyramid (in Numbers)
Posted on 2003-10-14 (21 Comments)
re: solution by Charlie (2003-10-14 14:17:41)
Difficulty: 3 of 5Under Penny Problem (in Logic)
Posted on 2003-10-14 (18 Comments)
re(3): solution by Charlie (2003-10-14 14:13:59)
Difficulty: 3 of 5Under Playing With Marbles (in Probability)
Posted on 2003-10-13 (23 Comments)
re: no expert by Charlie (2003-10-14 10:42:40)
re: Extension to the problem by Charlie (2003-10-14 10:37:33)
Difficulty: 4 of 5Under Same Name (in Probability)
Posted on 2003-10-11 (7 Comments)
re: solution -- numerically by Charlie (2003-10-12 09:49:02)
example by Charlie (2003-10-11 21:47:56)
Solution solution by Charlie (2003-10-11 10:15:30)
Difficulty: 4 of 5Under Strike a Chord (..Any Chord) (in Geometry)
Posted on 2003-10-09 (51 Comments)
re(2): You're right! by Charlie (2003-11-17 16:11:15)
re: You're right! by Charlie (2003-11-17 15:58:59)
re: A revised solution: by Charlie (2003-11-17 08:20:40)
re(2): An elegant solution by Charlie (2003-10-13 15:01:42)
Faith or Reason--no one will come to a final conclusion. by Charlie (2003-10-10 08:59:06)
Both right, but... by Charlie (2003-10-09 15:32:00)
Difficulty: 4 of 5Under The Last Baby (in Probability)
Posted on 2003-10-08 (24 Comments)
re: assumption by Charlie (2003-10-11 23:01:58)
re(2): solution - different manner of looking at this by Charlie (2003-10-08 22:16:23)
re: I have not read Charlie's post yet by Charlie (2003-10-08 15:46:02)
Solution solution by Charlie (2003-10-08 10:25:35)
Difficulty: 3 of 5Under At the Olympic Games (1) (in Logic)
Posted on 2003-10-07 (21 Comments)
Of course one thing is assumed. by Charlie (2003-10-08 09:28:31)
re(8):solution by Charlie (2003-10-07 14:33:07)
re(5):solution by Charlie (2003-10-07 13:36:17)
Difficulty: 3 of 5Under Mental Arithmetic (in Numbers)
Posted on 2003-10-05 (21 Comments)
Some Thoughts another path? by Charlie (2003-10-05 14:36:43)
clarification by Charlie (2003-10-05 11:22:39)
Difficulty: 3 of 5Under Centrifugal Balance (in Shapes)
Posted on 2003-10-04 (13 Comments)
Two solutions to the chemist's problem. by Charlie (2003-10-04 13:45:17)
Difficulty: 3 of 5Under Formula None Racer (in Just Math)
Posted on 2003-10-03 (35 Comments)
Well, since fwaff was expecting one. by Charlie (2003-10-03 11:21:10)
Difficulty: 3 of 5Under The Mazing (in Algorithms)
Posted on 2003-10-02 (4 Comments)
why didn't my <pre> work? by Charlie (2003-10-02 22:25:40)
Solution solution by Charlie (2003-10-02 22:16:07)
Hints/Tips For starters by Charlie (2003-10-02 15:45:16)
Difficulty: 3 of 5Under Deceleration (in Just Math)
Posted on 2003-10-02 (17 Comments)
re: Hey guys!! by Charlie (2003-10-02 14:25:02)
re: okay, here goes by Charlie (2003-10-02 09:43:34)
Solution solution by Charlie (2003-10-02 09:23:29)
Difficulty: 3 of 5Under Words in Common 7 (in Word Problems)
Posted on 2003-09-30 (17 Comments)
re(2): Not only do they all have 7 letters, but... by Charlie (2003-10-01 14:30:33)
Difficulty: 2 of 5Under Temperature Reflection (in Numbers)
Posted on 2003-09-29 (11 Comments)
re(2): computer solution by Charlie (2003-09-29 20:13:17)
Solution computer solution by Charlie (2003-09-29 11:00:07)
Difficulty: 3 of 5Under Cut chessboard (in Shapes)
Posted on 2003-09-26 (7 Comments)
Solution the Solution by Charlie (2003-09-26 10:03:32)
Difficulty: 3 of 5Under Simultaneous Equations (in Numbers)
Posted on 2003-09-25 (19 Comments)
re: Trivial solution by Charlie (2003-09-25 15:21:31)
Difficulty: 4 of 5Under Word Ladders (in Algorithms)
Posted on 2003-09-24 (11 Comments)
re(2): Finding adjacent words by Charlie (2003-09-26 11:51:23)
Difficulty: 3 of 5Under Two Spheres (in Geometry)
Posted on 2003-09-24 (7 Comments)
Solution solution by Charlie (2003-09-24 09:55:32)
Difficulty: 3 of 5Under Sequence Group (in Sequences)
Posted on 2003-09-23 (8 Comments)
re(2): solution by Charlie (2003-09-24 22:02:47)
re: guess by Charlie (2003-09-23 20:58:51)
Solution solution by Charlie (2003-09-23 20:55:22)
Difficulty: 3 of 5Under Pretzel sticks (in Numbers)
Posted on 2003-09-22 (5 Comments)
Solution solution by Charlie (2003-09-22 13:27:43)
Difficulty: 4 of 5Under Master Number (in Games)
Posted on 2003-09-20 (10 Comments)
re: Solution by Charlie (2003-09-21 10:07:21)
Solution solution by Charlie (2003-09-20 10:53:44)
Difficulty: 5 of 5Under print 'print 'print 'print ... (in Algorithms)
Posted on 2003-09-19 (32 Comments)
re: SOLUTION (2) - Not Mine -- Basic version by Charlie (2003-09-19 21:42:00)
Difficulty: 2 of 5Under Not so triggy (in Word Problems)
Posted on 2003-09-19 (18 Comments)
re: by Charlie (2003-09-19 21:51:37)
Difficulty: 3 of 5Under Distant Solar System (in Science)
Posted on 2003-09-18 (13 Comments)
re: solution?!? by Charlie (2003-09-18 15:26:44)
Difficulty: 2 of 5Under The carnival game (in Probability)
Posted on 2003-09-18 (30 Comments)
Corrected Simulation Results by Charlie (2003-09-18 17:25:04)
re(5): Solution by Charlie (2003-09-18 16:52:51)
re(3): Solution by Charlie (2003-09-18 15:13:23)
Difficulty: 1 of 5Under The famous horse (in Tricks)
Posted on 2003-09-17 (26 Comments)
Solution solution by Charlie (2003-09-17 08:45:21)
Difficulty: 2 of 5Under Pip Me! (in General)
Posted on 2003-09-16 (12 Comments)
Solution solution by Charlie (2003-09-16 10:24:16)
Difficulty: 3 of 5Under Resting Sphere (in Geometry)
Posted on 2003-09-13 (19 Comments)
re: What I came up with by Charlie (2003-09-13 16:37:59)
Solution solution by Charlie (2003-09-13 13:31:48)
Difficulty: 5 of 5Under Old MacDonald Had a Sequence (in Sequences)
Posted on 2003-09-12 (18 Comments)
re(8): solution by Charlie (2003-09-12 15:12:20)
re(6): solution by Charlie (2003-09-12 14:51:46)
re(2): solution by Charlie (2003-09-12 09:57:21)
Solution solution by Charlie (2003-09-12 09:33:28)
Difficulty: 4 of 5Under Collision Course (in Algorithms)
Posted on 2003-09-11 (13 Comments)
re: Two robots, same program by Charlie (2003-09-12 09:41:56)
Difficulty: 3 of 5Under Words in Common 4 (in Word Problems)
Posted on 2003-09-11 (5 Comments)
re(2): solution by Charlie (2003-09-11 14:51:32)
Solution solution by Charlie (2003-09-11 10:11:20)
Difficulty: 3 of 5Under Counting Exercise (in Numbers)
Posted on 2003-09-10 (10 Comments)
Solution solution by Charlie (2003-09-10 16:04:20)
Difficulty: 3 of 5Under Got a Minute? (in Logic)
Posted on 2003-09-10 (36 Comments)
re: 2 timers??? by Charlie (2004-01-28 22:12:53)
re(2): Got it - but you gotta be fast!!! by Charlie (2003-09-18 16:14:02)
Some Thoughts a start by Charlie (2003-09-10 14:15:01)
Some Thoughts thoughts by Charlie (2003-09-10 11:26:48)
Difficulty: 3 of 5Under Towers of Hanoi (in Algorithms)
Posted on 2003-09-07 (22 Comments)
re(2): Stacks--Basic version by Charlie (2003-09-09 14:14:52)
re: Stacks--Basic version by Charlie (2003-09-09 14:07:51)
re: Recursion challenge by Charlie (2003-09-07 16:12:32)
re(2): strategy by Charlie (2003-09-07 15:48:01)
strategy by Charlie (2003-09-07 11:23:12)
re: Holy Hula Hoops! by Charlie (2003-09-07 11:14:04)
Difficulty: 3 of 5Under School Shelves (in Logic)
Posted on 2003-09-06 (27 Comments)
re: Solution by Charlie (2003-09-06 16:54:41)
Difficulty: 3 of 5Under Know Who Your Friends Are (in Liars and Knights)
Posted on 2003-09-05 (7 Comments)
Solution solution by Charlie (2003-09-05 14:41:39)
Difficulty: 4 of 5Under Move the 6, Quadruple the Number (in Numbers)
Posted on 2003-09-04 (6 Comments)
Solution solution by Charlie (2003-09-04 14:47:24)
Difficulty: 3 of 5Under Word Meld 6 (in Word Problems)
Posted on 2003-09-04 (14 Comments)
Solution The RULES part by Charlie (2003-09-04 11:32:28)
Difficulty: 3 of 5Under The Confusion (in Logic)
Posted on 2003-09-02 (14 Comments)
Solution solution by Charlie (2003-09-02 15:02:20)
Difficulty: 3 of 5Under Wacky Wordies (in Word Problems)
Posted on 2003-09-02 (10 Comments)
Interesting aside by Charlie (2013-02-18 21:44:08)
re: Some solutions by Charlie (2003-09-02 11:36:27)
Difficulty: 3 of 5Under Soldiers and Sailors (in Liars and Knights)
Posted on 2003-09-01 (7 Comments)
re: solution by Charlie (2003-09-01 20:51:42)
Solution solution by Charlie (2003-09-01 17:27:01)
Difficulty: 3 of 5Under t1eq6n (in Cryptography)
Posted on 2003-09-01 (17 Comments)
re: Ig2e (I give) by Charlie (2003-09-02 08:50:12)
stuck--can't be chicken matzos, can it? by Charlie (2003-09-01 15:19:11)
re(3): Solution by Charlie (2003-09-01 14:56:14)
L3yS4m by Charlie (2003-09-01 10:44:18)
Difficulty: 3 of 5Under Number Quiz (in Numbers)
Posted on 2003-08-28 (25 Comments)
re: educational guess by Charlie (2003-08-29 15:22:19)
Solution Maximal Brute Force by Charlie (2003-08-29 08:57:40)
Difficulty: 3 of 5Under The Deleted Number (in Just Math)
Posted on 2003-08-27 (13 Comments)
Solution another method by Charlie (2003-08-27 16:16:27)
Difficulty: 4 of 5Under 2 Colors 2 (in Geometry)
Posted on 2003-08-25 (14 Comments)
re(3): 5-point proof - to DJ by Charlie (2003-09-21 16:34:10)
Some Thoughts a proof by Charlie (2003-08-25 13:17:23)
Difficulty: 3 of 5Under Doctor and Engineer (in Logic)
Posted on 2003-08-25 (26 Comments)
re: Hmm... by Charlie (2003-08-28 08:42:52)
re: Solved by Charlie (2003-08-27 20:06:27)
re: I have real solution!!! by Charlie (2003-08-26 08:53:15)
re: solution by Charlie (2003-08-26 08:51:15)
re: the REAL solution, oops by Charlie (2003-08-26 08:49:02)
Solution solution by Charlie (2003-08-25 09:18:50)
Difficulty: 4 of 5Under Breakfast (in Logic)
Posted on 2003-08-23 (12 Comments)
re(3): Full Solution by Charlie (2003-08-23 15:32:13)
Difficulty: 3 of 5Under One Equals Two (in Tricks)
Posted on 2003-08-22 (10 Comments)
Solution flaws by Charlie (2003-08-22 08:43:50)
Difficulty: 3 of 5Under Spirals (in Algorithms)
Posted on 2003-08-21 (11 Comments)
re(2): solution by Charlie (2003-08-21 16:54:31)
re(2): FULL SOLUTION (in C) by Charlie (2003-08-21 16:51:49)
re: solution by Charlie (2003-08-21 16:39:35)
Solution solution by Charlie (2003-08-21 16:36:43)
Difficulty: 5 of 5Under Knight's Tour (in General)
Posted on 2003-08-21 (4 Comments)
Solution solution by Charlie (2003-08-21 08:56:00)
Difficulty: 3 of 5Under Roots Of The Equation (in Probability)
Posted on 2003-08-20 (17 Comments)
re: solution by Charlie (2003-08-20 10:19:30)
Difficulty: 4 of 5Under Super Number Square (in Numbers)
Posted on 2003-08-19 (10 Comments)
Question can it be shown ... by Charlie (2003-08-20 08:32:47)
Solution solution -- analysis plus trial and error by Charlie (2003-08-19 15:53:55)
Difficulty: 4 of 5Under The Amazing Shrinking Word (in Word Problems)
Posted on 2003-08-19 (12 Comments)
re(2): computer search-- the program by Charlie (2003-08-19 09:07:50)
re: computer search-- the program by Charlie (2003-08-19 09:05:00)
Solution computer search by Charlie (2003-08-19 08:59:50)
Difficulty: 3 of 5Under Letter Cubes 3 (in Logic)
Posted on 2003-08-17 (14 Comments)
Solution solution by Charlie (2003-08-17 11:16:21)
Difficulty: 3 of 5Under Get it in Gear (in Numbers)
Posted on 2003-08-15 (8 Comments)
Solution re: The Mechanical Revolution by Charlie (2003-08-15 14:49:10)
Difficulty: 3 of 5Under Shepherd's puzzle (in General)
Posted on 2003-08-13 (9 Comments)
re: solution by Charlie (2003-08-13 14:48:04)
Solution solution by Charlie (2003-08-13 14:46:16)
Difficulty: 2 of 5Under Word Meld 4 (in Word Problems)
Posted on 2003-08-13 (10 Comments)
re: could it be by Charlie (2003-08-16 11:59:26)
Solution re: I'm not sure I get the rules by Charlie (2003-08-13 08:39:39)
Difficulty: 2 of 5Under Statistics, statistics. (in Just Math)
Posted on 2003-08-12 (4 Comments)
re: my thoughts by Charlie (2003-08-12 09:26:10)
Difficulty: 2 of 5Under The Safe (in Probability)
Posted on 2003-08-11 (11 Comments)
Solution solution by Charlie (2003-08-11 09:43:59)
Difficulty: 4 of 5Under Tricky Code (in Cryptography)
Posted on 2003-08-10 (9 Comments)
re(2): Got it!! by Charlie (2003-08-11 13:50:51)
Some Thoughts thoughts by Charlie (2003-08-11 09:46:27)
Difficulty: 3 of 5Under Words in Common 2 (in Word Problems)
Posted on 2003-08-08 (6 Comments)
re(2): Guess?--Other words like this and a probability problem by Charlie (2003-08-08 13:57:48)
re: Guess?--Other words like this and a probability problem by Charlie (2003-08-08 11:25:38)
Difficulty: 1 of 5Under Farm Animal? (in Riddles)
Posted on 2003-08-03 (38 Comments)
Is it... by Charlie (2003-08-04 02:45:33)
Difficulty: 3 of 5Under The Race (in Liars and Knights)
Posted on 2003-08-02 (12 Comments)
re(2): Is it this simple or am I misinterpreting the rules? by Charlie (2003-08-02 09:21:51)
Solution Is it this simple or am I misinterpreting the rules? by Charlie (2003-08-02 05:17:49)
Difficulty: 1 of 5Under Nice sequence (in Sequences)
Posted on 2003-08-01 (10 Comments)
Solution More solutions from the on-line handbook of integer sequences by Charlie (2003-08-01 15:07:53)
Difficulty: 3 of 5Under Six Letters And Eight Words (in Word Problems)
Posted on 2003-07-31 (15 Comments)
Solution computer search by Charlie (2003-07-31 11:12:28)
Solution solution by Charlie (2003-07-31 07:47:30)
Difficulty: 2 of 5Under What's the Time? (in Numbers)
Posted on 2003-07-30 (23 Comments)
re: Solution by Charlie (2003-07-30 02:37:10)
Difficulty: 3 of 5Under Word Meld 3 (in Word Problems)
Posted on 2003-07-29 (6 Comments)
Solution re: New Challenge by Charlie (2003-07-30 02:50:51)
Difficulty: 4 of 5Under A bizarre sequence (in Sequences)
Posted on 2003-07-28 (14 Comments)
re: solution by Charlie (2003-07-29 02:49:48)
re: solution by Charlie (2003-07-28 15:13:36)
Difficulty: 3 of 5Under Is It or Is It Not ? (in Word Problems)
Posted on 2003-07-27 (15 Comments)
Solution How about... by Charlie (2003-07-27 06:36:15)
Difficulty: 3 of 5Under Mike and the Bike (in Logic)
Posted on 2003-07-26 (42 Comments)
Solution solution by Charlie (2003-07-26 04:50:59)
Difficulty: 3 of 5Under A Bag of Fake Coins (in Weights and Scales)
Posted on 2003-07-25 (16 Comments)
Solution re(5): solution (plus one)--Even More by Charlie (2003-07-28 15:53:01)
re(4): solution (plus one)--Even More by Charlie (2003-07-28 15:50:13)
No Subject by Charlie (2003-07-28 15:49:36)
re(2): solution (plus one) by Charlie (2003-07-26 10:18:22)
Solution solution by Charlie (2003-07-25 11:08:52)
Difficulty: 2 of 5Under Die Toss (in Probability)
Posted on 2003-07-24 (11 Comments)
Solution The probabilities by Charlie (2003-07-24 12:45:59)
Difficulty: 2 of 5Under Permutation List (in Numbers)
Posted on 2003-07-23 (7 Comments)
Solution solution by Charlie (2003-07-23 09:44:07)
Difficulty: 2 of 5Under Dice Bingo (in Probability)
Posted on 2003-07-22 (7 Comments)
re: Solution by Charlie (2003-07-23 16:33:20)
Solution solution by Charlie (2003-07-22 12:40:52)
Difficulty: 2 of 5Under Party People (in Numbers)
Posted on 2003-07-21 (8 Comments)
Solution solution by Charlie (2003-07-21 12:10:19)
Difficulty: 3 of 5Under Three Surgeons and A Cook (in Logic)
Posted on 2003-07-21 (24 Comments)
re: Similar by Charlie (2003-08-23 15:46:41)
Solution solution by Charlie (2003-07-21 03:04:15)
re: possibility... by Charlie (2003-07-21 02:55:37)
re(2): possibility... by Charlie (2003-07-21 02:54:05)
Difficulty: 3 of 5Under Reciprocal Equation #2 (in Just Math)
Posted on 2003-07-20 (15 Comments)
re: Pattern (re: hmmm...) by Charlie (2003-07-20 10:47:49)
re: hmmm... by Charlie (2003-07-20 04:57:49)
Some Thoughts hmmm... by Charlie (2003-07-20 04:49:28)
Difficulty: 2 of 5Under Reciprocal Equation #1 (in Just Math)
Posted on 2003-07-18 (5 Comments)
Some Thoughts solution? by Charlie (2003-07-18 02:29:31)
Difficulty: 3 of 5Under Numbered Letters (in Word Problems)
Posted on 2003-07-17 (28 Comments)
re: what about this by Charlie (2003-10-06 10:31:20)
re(2): the third list by Charlie (2003-07-25 11:16:35)
re: the third list by Charlie (2003-07-25 11:15:41)
re(3): challenge by Charlie (2003-07-18 10:02:14)
re(3): challenge by Charlie (2003-07-18 09:42:16)
re(2): Words for part A by Charlie (2003-07-18 08:04:45)
Solution Words for Part B by Charlie (2003-07-17 16:41:23)
Solution Words for part A by Charlie (2003-07-17 16:39:10)
Some Thoughts mathematical note by Charlie (2003-07-17 11:50:20)
Some Thoughts program for finding them by Charlie (2003-07-17 11:44:52)
Difficulty: 3 of 5Under Age of ages (in Numbers)
Posted on 2003-07-16 (12 Comments)
re: my solution by Charlie (2003-07-17 09:19:27)
re(2): Solution by Charlie (2003-07-17 09:10:50)
Solution Solution by Charlie (2003-07-16 08:54:39)
Difficulty: 3 of 5Under Sensible Sequence (in Sequences)
Posted on 2003-07-15 (6 Comments)
Some Thoughts Phenomenon by Charlie (2003-07-15 09:35:21)
Difficulty: 3 of 5Under 7-11 (in Numbers)
Posted on 2003-07-11 (14 Comments)
re: a way to the solution by Charlie (2003-07-12 06:43:37)
Difficulty: 4 of 5Under Random Primes (in Probability)
Posted on 2003-07-10 (9 Comments)
re: Solution by Charlie (2003-07-14 03:08:54)
re(2): First steps.... by Charlie (2003-07-10 08:30:26)
Solution solution by Charlie (2003-07-10 08:24:24)
Difficulty: 2 of 5Under Do it again (in General)
Posted on 2003-07-10 (13 Comments)
re: I think I've got it by Charlie (2003-07-10 04:11:58)
Difficulty: 1 of 5Under The Baseball Game (in Riddles)
Posted on 2003-07-08 (51 Comments)
re(2): another way - solution? by Charlie (2003-07-09 03:47:24)
Difficulty: 4 of 5Under Can Y@@ou D%ecry*pt This? (in Cryptography)
Posted on 2003-07-07 (18 Comments)
Some Thoughts observation by Charlie (2003-07-07 11:01:40)
Difficulty: 2 of 5Under More knights,liars,and knaves (in Liars and Knights)
Posted on 2003-07-07 (19 Comments)
re: Solution by Charlie (2003-07-07 03:31:37)
Difficulty: 3 of 5Under Four Digit Number II (in Numbers)
Posted on 2003-07-06 (12 Comments)
re(2): Solution by Charlie (2003-07-06 06:09:26)
re: Solution by Charlie (2003-07-06 06:07:14)
Difficulty: 3 of 5Under Gain or Loss (in Just Math)
Posted on 2003-07-05 (10 Comments)
re: Another Question! by Charlie (2003-07-05 13:29:34)
Difficulty: 3 of 5Under Word Meld 2 (in Word Problems)
Posted on 2003-07-04 (10 Comments)
re(4): More solutions in that number by Charlie (2003-07-07 08:25:18)
Solution More solutions in that number by Charlie (2003-07-04 08:03:58)
Difficulty: 2 of 5Under Wacko Calculator (in Numbers)
Posted on 2003-07-03 (12 Comments)
Solution solution by Charlie (2003-07-03 02:57:15)
Difficulty: 3 of 5Under Permutations (in Algorithms)
Posted on 2003-07-02 (14 Comments)
re(2): two ways by Charlie (2003-07-03 09:13:19)
Difficulty: 3 of 5Under Intersecting lines (in Algorithms)
Posted on 2003-07-01 (20 Comments)
re: Points on an ellipse by Charlie (2003-07-08 08:44:37)
re(3): Solution by Charlie (2003-07-04 06:02:41)
re: No Code, just theory by Charlie (2003-07-03 03:15:44)
re: fairly easy by Charlie (2003-07-02 08:24:21)
Question re: Solution by Charlie (2003-07-02 03:40:46)
Geometric Solution by Charlie (2003-07-01 09:54:13)
Solution Algebraic Solution by Charlie (2003-07-01 09:45:39)
Difficulty: 4 of 5Under We put the 'fun' in function (in Just Math)
Posted on 2003-07-01 (4 Comments)
Solution solution by Charlie (2003-07-01 03:00:44)
Difficulty: 3 of 5Under Telephone Call (in Tricks)
Posted on 2003-06-30 (26 Comments)
Solution Another solution by Charlie (2003-06-30 10:29:01)
Solution Another possibility by Charlie (2003-06-30 08:37:56)
Difficulty: 3 of 5Under More randomness! (in Algorithms)
Posted on 2003-06-30 (16 Comments)
Question re(4): solution by Charlie (2003-07-01 05:38:24)
re(2): solution by Charlie (2003-06-30 15:14:41)
Solution solution by Charlie (2003-06-30 08:52:22)
re: Quick and Dirty Solution by Charlie (2003-06-30 08:50:42)
Difficulty: 4 of 5Under Square Deal (in Shapes)
Posted on 2003-06-30 (9 Comments)
Solution solution by Charlie (2003-06-30 03:20:17)
Difficulty: 3 of 5Under Letter Cubes 2 (in Logic)
Posted on 2003-06-28 (8 Comments)
re: Solution by Charlie (2003-06-29 03:58:43)
Difficulty: 2 of 5Under A Number Line (in Numbers)
Posted on 2003-06-18 (6 Comments)
Solution solution by Charlie (2003-06-18 15:31:27)
Difficulty: 3 of 5Under A Change of Mind (in Just Math)
Posted on 2003-06-18 (13 Comments)
re: Solution (After all that) by Charlie (2003-06-20 08:55:20)
Solution The list by Charlie (2003-06-18 09:39:45)
Difficulty: 4 of 5Under Letter Cubes (in Logic)
Posted on 2003-06-17 (21 Comments)
Solution solution by Charlie (2003-06-17 16:56:24)
Difficulty: 3 of 5Under Just Keep the Change (in Numbers)
Posted on 2003-06-15 (14 Comments)
Solution One Possibility by Charlie (2003-06-15 05:42:52)
Difficulty: 4 of 5Under Jeopardy (in Logic)
Posted on 2003-06-14 (13 Comments)
re(3): solution by Charlie (2003-06-15 16:33:05)
Solution re: solution by Charlie (2003-06-15 05:28:15)
Solution solution by Charlie (2003-06-14 04:51:34)
Difficulty: 3 of 5Under And another Hobbit Riddle (in Famous Riddles)
Posted on 2003-06-13 (28 Comments)
another answer by Charlie (2003-06-14 02:27:58)
Difficulty: 2 of 5Under Three More Logicians (in Logic)
Posted on 2003-06-12 (6 Comments)
Solution solution by Charlie (2003-06-12 08:58:01)
Difficulty: 3 of 5Under Mind Boggling (in Logic)
Posted on 2003-06-11 (8 Comments)
Other big words by Charlie (2003-06-11 05:23:54)
Solution solution by Charlie (2003-06-11 02:58:55)
Difficulty: 4 of 5Under Knights being Liars? (in Liars and Knights)
Posted on 2003-06-10 (24 Comments)
re: Eliminate by Charlie (2003-06-11 16:53:37)
Solution solution (assuming...) by Charlie (2003-06-10 09:52:36)
Difficulty: 1 of 5Under Number machine problem 1 (in Algorithms)
Posted on 2003-06-08 (12 Comments)
Solution My Solution by Charlie (2003-06-08 10:35:49)
re(2): Solution by Charlie (2003-06-08 05:02:57)
Difficulty: 4 of 5Under Multiple Choice Test (in Logic)
Posted on 2003-06-07 (19 Comments)
re: Hint by Charlie (2003-06-07 09:23:15)
Solution re: Brute force method.--solution by Charlie (2003-06-07 06:14:34)
Brute force method. by Charlie (2003-06-07 06:12:31)
Difficulty: 3 of 5Under Word Meld 1 (in Word Problems)
Posted on 2003-06-06 (23 Comments)
re: solution by Charlie (2003-06-10 08:10:53)
Another non-obscure 6-step solution by Charlie (2003-06-08 04:56:42)
re(3): Out and about by Charlie (2003-06-07 06:24:51)
Solution solution by Charlie (2003-06-06 09:02:59)
Difficulty: 2 of 5Under Horses On Hills (in Famous Riddles)
Posted on 2003-06-06 (30 Comments)
re: The number by Charlie (2003-06-06 05:08:13)
Question The number by Charlie (2003-06-06 05:06:33)
Difficulty: 5 of 5Under Let it Snow (in Calculus)
Posted on 2003-06-05 (12 Comments)
Solution If my math is right... by Charlie (2003-06-05 10:33:03)
Difficulty: 2 of 5Under Riddle from the Hobbit (in Famous Riddles)
Posted on 2003-06-05 (34 Comments)
re(2): solution? by Charlie (2003-06-05 06:10:05)
solution? by Charlie (2003-06-05 03:18:12)
Difficulty: 4 of 5Under The Quaker Queens of Chess (in Games)
Posted on 2003-06-03 (9 Comments)
re: I don't get it. by Charlie (2003-06-21 17:24:10)
re: solution by Charlie (2003-06-03 08:30:47)
Solution solution by Charlie (2003-06-03 08:20:48)
Difficulty: 2 of 5Under Primary Product (in Just Math)
Posted on 2003-06-02 (26 Comments)
re: One and Only by Charlie (2003-06-03 08:48:16)
re(3): Umm by Charlie (2003-06-02 09:30:37)
re(3): Umm by Charlie (2003-06-02 09:24:15)
re(2): Umm by Charlie (2003-06-02 09:22:32)
Difficulty: 3 of 5Under Going up (in Just Math)
Posted on 2003-06-01 (10 Comments)
Solution solution by Charlie (2003-06-01 05:45:33)
Difficulty: 3 of 5Under 27 Weights (in Just Math)
Posted on 2003-05-31 (15 Comments)
re(2): part b (7 groups -bug fixed) by Charlie (2003-05-31 16:15:51)
re: very easy by Charlie (2003-05-31 15:49:05)
re: part b by Charlie (2003-05-31 11:46:07)
The program for 5 groups by Charlie (2003-05-31 11:12:42)
Some Thoughts part b by Charlie (2003-05-31 11:06:01)
re: Proof by Charlie (2003-05-31 10:51:21)
re(2): First answer: by Charlie (2003-05-31 08:57:43)
Difficulty: 3 of 5Under All dogs are the same color! (in Paradoxes)
Posted on 2003-05-30 (23 Comments)
Solution solution by Charlie (2003-05-30 10:22:18)
re: My thoughts. by Charlie (2003-05-30 10:14:59)
Difficulty: 3 of 5Under Round Table (in Logic)
Posted on 2003-05-30 (12 Comments)
Solution solution by Charlie (2003-05-30 03:08:31)
Difficulty: 2 of 5Under Gold on the island (in Liars and Knights)
Posted on 2003-05-29 (15 Comments)
re: A Different Solution by Charlie (2003-05-29 16:36:34)
Difficulty: 2 of 5Under Adam and Eve (in Riddles)
Posted on 2003-05-28 (41 Comments)
re: No belly buttons? by Charlie (2003-05-28 09:37:33)
re(2): Solution by Charlie (2003-05-28 09:36:26)
Some Thoughts maybe? by Charlie (2003-05-28 02:48:35)
Difficulty: 3 of 5Under Ten-Digit Numbers (in Numbers)
Posted on 2003-05-27 (4 Comments)
Solution solution by Charlie (2003-05-27 03:39:19)
Difficulty: 3 of 5Under Ascending numbers! (in Numbers)
Posted on 2003-05-25 (5 Comments)
re(2): solution by Charlie (2003-05-25 10:27:16)
Solution solution by Charlie (2003-05-25 05:26:17)
Difficulty: 3 of 5Under Too Old For Young (in Just Math)
Posted on 2003-05-24 (13 Comments)
re: Solutions by Charlie (2003-05-25 05:37:39)
Solution solution by Charlie (2003-05-24 04:59:16)
Difficulty: 3 of 5Under Add down to One (in Numbers)
Posted on 2003-05-21 (17 Comments)
re(2): Solution plus by Charlie (2003-06-05 09:58:15)
re: Solution plus by Charlie (2003-05-22 06:52:24)
re(3): Solution plus by Charlie (2003-05-21 09:33:35)
Difficulty: 1 of 5Under Flipping a coin (in Probability)
Posted on 2003-05-20 (23 Comments)
re: No solution yet? Nonsense! by Charlie (2003-05-24 07:49:01)
Difficulty: 4 of 5Under Don't Be a Square (in Probability)
Posted on 2003-05-19 (21 Comments)
The Solution & Generalization by Charlie (2003-05-24 06:01:53)
Web Research by Charlie (2003-05-23 03:51:22)
re(4): Simulation by Charlie (2003-05-22 05:25:35)
re(2): Simulation by Charlie (2003-05-21 03:40:30)
re: Simulation by Charlie (2003-05-20 10:07:34)
Simulation by Charlie (2003-05-20 10:03:08)
re: Am I correct in saying this by Charlie (2003-05-20 04:53:19)
re: Numerical Answers by Charlie (2003-05-19 17:59:22)
re(2): Solution by Charlie (2003-05-19 16:15:15)
re: My idea as well by Charlie (2003-05-19 15:44:21)
re(3): Numerical Answers by Charlie (2003-05-19 15:40:22)
re: Numerical Answers by Charlie (2003-05-19 09:43:33)
Some Thoughts Numerical Answers by Charlie (2003-05-19 09:40:39)
Difficulty: 3 of 5Under The Best Room at the Inn (in Liars and Knights)
Posted on 2003-05-16 (20 Comments)
re(3): Please Someone Correct Me by Charlie (2003-05-20 11:06:33)
re: Flocking Together by Charlie (2003-05-18 04:38:27)
re: Please Someone Correct Me by Charlie (2003-05-18 04:37:17)
Solution Same answer--different sequence of logic by Charlie (2003-05-16 05:44:59)
Difficulty: 5 of 5Under Regular Pentagon (Classic) (in Geometry)
Posted on 2003-05-15 (17 Comments)
Solution Solution by Charlie (2003-05-17 09:08:11)
re: Solution by Charlie (2003-05-16 03:20:26)
Difficulty: 4 of 5Under Three Digit Number (in Just Math)
Posted on 2003-05-15 (28 Comments)
re: Hmm by Charlie (2003-05-17 09:18:21)
re(2): solution (More confusing!) by Charlie (2003-05-16 08:03:20)
Solution solution by Charlie (2003-05-15 11:25:51)
Difficulty: 5 of 5Under Many coins - one fake (in Weights and Scales)
Posted on 2003-05-14 (20 Comments)
re(3): solution to B by Charlie (2003-05-19 04:30:47)
re: solution to B by Charlie (2003-05-18 04:48:18)
Some Thoughts solution for A; thoughts on B by Charlie (2003-05-14 09:17:00)
Difficulty: 2 of 5Under Hearts And Spades (in General)
Posted on 2003-05-14 (30 Comments)
re: Is this it? by Charlie (2003-05-14 03:12:35)
Difficulty: 3 of 5Under Unknown answers (in Liars and Knights)
Posted on 2003-05-13 (13 Comments)
re: Solution by Charlie (2003-05-13 04:30:43)
Solution solution by Charlie (2003-05-13 04:21:29)
Difficulty: 3 of 5Under Paint My Love (in Just Math)
Posted on 2003-05-12 (5 Comments)
re: Linear maximization (Solution) by Charlie (2003-05-12 16:10:58)
Solution Excel Result by Charlie (2003-05-12 03:47:07)
Difficulty: 2 of 5Under In violation of Thermodynamics (in Science)
Posted on 2003-05-11 (18 Comments)
Some Thoughts thoughts and considerations by Charlie (2003-05-11 05:27:04)
Difficulty: 3 of 5Under The Termite (in Logic)
Posted on 2003-05-09 (11 Comments)
Solution Solution? by Charlie (2003-05-09 04:40:45)
Difficulty: 4 of 5Under Magic trick (in Games)
Posted on 2003-05-08 (20 Comments)
Solution Solution: (I don't remember where I saw this but it was in the past year.) by Charlie (2003-05-08 07:59:47)
Difficulty: 2 of 5Under True Or False - Part 2 (in Paradoxes)
Posted on 2003-05-07 (45 Comments)
Some Thoughts thoughts by Charlie (2003-05-07 04:31:00)
Difficulty: 3 of 5Under Large Number (in Just Math)
Posted on 2003-05-06 (18 Comments)
Solution solution by Charlie (2003-05-06 08:06:48)
Difficulty: 3 of 5Under Circular intersection (in Geometry)
Posted on 2003-05-06 (4 Comments)
Solution solution by Charlie (2003-05-06 03:12:53)
Difficulty: 4 of 5Under The Hat and the River (in General)
Posted on 2003-05-05 (24 Comments)
Solution solution by Charlie (2003-05-05 16:24:12)
Difficulty: 4 of 5Under Location X (in Geometry)
Posted on 2003-05-05 (6 Comments)
re: where's the sign? by Charlie (2008-09-22 10:48:25)
Difficulty: 3 of 5Under Love Me For A Reason (in Logic)
Posted on 2003-05-03 (11 Comments)
Solution solution by Charlie (2003-05-04 05:14:49)
Difficulty: 3 of 5Under Can 1 Dollar = 1 Cent (in Tricks)
Posted on 2003-05-03 (27 Comments)
Solution solution by Charlie (2003-05-03 03:57:28)
Difficulty: 3 of 5Under 9 random digits (in Algorithms)
Posted on 2003-05-02 (20 Comments)
re(2): Words too! by Charlie (2003-05-02 16:20:09)
re: The goal of this problem.... by Charlie (2003-05-02 08:27:21)
re: solution by Charlie (2003-05-02 08:20:59)
Solution solution by Charlie (2003-05-02 08:11:19)
Difficulty: 3 of 5Under Can You Find The Rule (in Sequences)
Posted on 2003-05-02 (11 Comments)
re: The next next number by Charlie (2003-05-07 18:34:37)
Difficulty: 3 of 5Under Pumpkins (in Just Math)
Posted on 2003-05-01 (16 Comments)
re: by Charlie (2003-05-03 04:17:06)
Difficulty: 3 of 5Under 3 colors (in Shapes)
Posted on 2003-05-01 (28 Comments)
re(2): Proof by contradiction by Charlie (2003-05-07 06:15:40)
re: Proof by contradiction by Charlie (2003-05-01 10:08:13)
Solution Proof by Charlie (2003-05-01 08:13:04)
re(3): Could be right by Charlie (2003-05-01 05:38:00)
re: Three-Dimensional Plane by Charlie (2003-05-01 05:32:54)
re: Two-Dimensional Plane by Charlie (2003-05-01 05:29:07)
re(3): Could be right by Charlie (2003-05-01 05:24:13)
Difficulty: 3 of 5Under Limit (in Tricks)
Posted on 2003-04-28 (12 Comments)
Solution Ooooohhhhhh! Now I get it. by Charlie (2003-04-28 07:41:13)
Difficulty: 4 of 5Under Professor and Students (in Logic)
Posted on 2003-04-28 (14 Comments)
re(3): well -- the computer language by Charlie (2003-05-03 04:43:16)
re: well -- the computer language by Charlie (2003-04-28 16:58:40)
re: solution by Charlie (2003-04-28 03:59:00)
Solution solution by Charlie (2003-04-28 03:53:56)
Difficulty: 2 of 5Under 2 colors (in Shapes)
Posted on 2003-04-27 (9 Comments)
Solution solution by Charlie (2003-04-27 04:08:59)
Difficulty: 4 of 5Under Four-Digit Number (in Numbers)
Posted on 2003-04-26 (15 Comments)
Some Thoughts re: Interesting! by Charlie (2003-04-27 04:06:07)
re: My solution -- exhausive search uniqueness shown by Charlie (2003-04-26 09:17:17)
Difficulty: 4 of 5Under Ratio of Volumes (in Just Math)
Posted on 2003-04-25 (5 Comments)
Solution solution by Charlie (2003-04-25 09:56:25)
Difficulty: 4 of 5Under Generation Gap (in Just Math)
Posted on 2003-04-25 (5 Comments)
re: solution -- Correction by Charlie (2003-04-25 04:34:46)
Solution solution by Charlie (2003-04-25 03:56:11)
Difficulty: 4 of 5Under 39 coins (in Weights and Scales)
Posted on 2003-04-23 (10 Comments)
re: General Solution by Charlie (2003-05-17 09:25:32)
re: THE SOLUTION by Charlie (2003-04-23 18:21:50)
Solution solution by Charlie (2003-04-23 13:12:14)
Difficulty: 2 of 5Under Numbers And Words (in General)
Posted on 2003-04-23 (23 Comments)
Solution re: mmmkay? by Charlie (2003-04-23 04:06:40)
Difficulty: 3 of 5Under Cleopatra and Marc Anthony (in Riddles)
Posted on 2003-04-22 (27 Comments)
re: Trey Anastasio??? by Charlie (2003-04-22 12:09:24)
Difficulty: 2 of 5Under Uninvited Guests (in Riddles)
Posted on 2003-04-22 (40 Comments)
My vote is for... by Charlie (2003-04-22 10:40:48)
Difficulty: 5 of 5Under Ladders Without Snakes (in Just Math)
Posted on 2003-04-21 (10 Comments)
re(2): solution by Charlie (2003-04-21 09:23:22)
Solution solution by Charlie (2003-04-21 09:01:01)
Difficulty: 3 of 5Under Craps (in Probability)
Posted on 2003-04-18 (19 Comments)
re(3): My premise is valid, Correction on outcome. by Charlie (2011-09-07 01:45:02)
re: My premise is valid, Correction on outcome. by Charlie (2011-09-06 10:31:03)
re(5): True Solution (Flaw in common answer.) by Charlie (2011-09-05 10:33:45)
re(3): True Solution (Flaw in common answer.) by Charlie (2011-09-04 10:50:11)
re: True Solution (Flaw in common answer.) by Charlie (2011-09-03 15:42:02)
Difficulty: 3 of 5Under Tetrahedron bounded by spheres (in Shapes)
Posted on 2003-04-17 (7 Comments)
re: Solution (long and complicated version) by Charlie (2003-04-17 10:04:54)
Solution This is the solution by Charlie (2003-04-17 09:42:15)
Difficulty: 3 of 5Under Making Dice, Part 2 (in Shapes)
Posted on 2003-04-17 (10 Comments)
Solution But, for the record by Charlie (2003-04-17 03:59:45)
Solution solution without spherical trig by Charlie (2003-04-17 03:55:24)
Difficulty: 3 of 5Under Odd and Even: Difference of Squares (in Just Math)
Posted on 2003-04-16 (10 Comments)
re(2): solution by Charlie (2003-04-16 10:18:56)
Solution solution by Charlie (2003-04-16 08:29:39)
Difficulty: 2 of 5Under Square Your Age (in Numbers)
Posted on 2003-04-15 (20 Comments)
re(2): Direct approach by Charlie (2003-04-16 05:29:07)
Solution Direct approach by Charlie (2003-04-16 04:57:34)
Difficulty: 4 of 5Under The Peculiar Pillar (in Calculus)
Posted on 2003-04-15 (12 Comments)
Solution A Twist by Charlie (2003-04-15 05:02:49)
No Subject by Charlie (2003-04-15 05:02:05)
Solution solution by Charlie (2003-04-15 03:44:41)
Difficulty: 4 of 5Under Leaving Las Vegas (in Just Math)
Posted on 2003-04-14 (9 Comments)
Solution re(2): solution--another solution by Charlie (2003-04-14 05:56:00)
Solution solution by Charlie (2003-04-14 03:28:56)
Difficulty: 3 of 5Under Make the least of these digits (in Numbers)
Posted on 2003-04-13 (68 Comments)
re(3): HELP !! I think I found out the SMALLEST Number by Charlie (2003-04-18 09:42:40)
re: Let's not reinvent the wheel by Charlie (2003-04-14 04:11:35)
re: I Think This Is The by Charlie (2003-04-14 03:47:43)
re(4): This is my Guess...(factorials of fractions)..... by Charlie (2003-04-14 03:45:58)
Better solution by Charlie (2003-04-13 15:11:58)
re(3): How About This Guess ?-- Does this work? Yes that works. by Charlie (2003-04-13 14:54:27)
Some Thoughts re: How About This Guess ?-- a better guess by Charlie (2003-04-13 07:56:43)
re(2): This is my Guess...(factorials of fractions)..... by Charlie (2003-04-13 05:48:40)
Difficulty: 3 of 5Under The Four Mathematicians (in Logic)
Posted on 2003-04-12 (14 Comments)
Solution First figure out... by Charlie (2003-04-12 04:40:10)
Difficulty: 3 of 5Under The Two Logicians (in Logic)
Posted on 2003-04-11 (7 Comments)
My Nitpicking Note by Charlie (2003-04-11 08:33:10)
Difficulty: 5 of 5Under a2o3t6t7 (in Cryptography)
Posted on 2003-04-09 (17 Comments)
Solution re(3): two thoughts--Possible Solution by Charlie (2003-04-09 09:33:31)
Difficulty: 4 of 5Under Zero - The Hero (in Numbers)
Posted on 2003-04-09 (16 Comments)
Solution Throwaway Zeros by Charlie (2003-04-09 04:38:36)
Difficulty: 1 of 5Under Drew and Mohammad (in Liars and Knights)
Posted on 2003-04-08 (46 Comments)
re(3): Not so fast by Charlie (2003-04-09 04:54:50)
re: Not so fast by Charlie (2003-04-08 09:48:47)
Difficulty: 2 of 5Under Zeros And Ones (in Numbers)
Posted on 2003-04-08 (23 Comments)
re: Smaller positive integers by Charlie (2008-02-16 11:37:24)
re(5): Idea by Charlie (2003-04-09 16:27:10)
re: Zeros and Ones by Charlie (2003-04-09 04:31:40)
re(4): Idea by Charlie (2003-04-08 19:38:57)
re(3): Idea by Charlie (2003-04-08 10:24:15)
re(2): Idea by Charlie (2003-04-08 09:59:53)
Solution re: Idea by Charlie (2003-04-08 03:50:39)
Difficulty: 4 of 5Under Calendar Cubes pt 3 (in Logic)
Posted on 2003-04-06 (14 Comments)
re(4): Attempt at a solution - 2 more combinations by Charlie (2003-04-08 15:15:40)
Attempt at a solution (probably too naive) by Charlie (2003-04-06 16:28:35)
Difficulty: 5 of 5Under Perfect Squares (in Just Math)
Posted on 2003-04-05 (10 Comments)
Solution solution by Charlie (2003-04-05 13:42:37)
Difficulty: 4 of 5Under A Floating Ball (in Calculus)
Posted on 2003-04-04 (7 Comments)
re(2): solution by Charlie (2003-04-04 11:24:18)
Solution re: solution by Charlie (2003-04-04 11:00:19)
Solution solution by Charlie (2003-04-04 10:52:10)
Difficulty: 4 of 5Under Trickiest Pearls (in Weights and Scales)
Posted on 2003-04-02 (3 Comments)
Solution conserving pearls by Charlie (2003-04-02 09:12:36)
Difficulty: 4 of 5Under Father And Grandfather (in Numbers)
Posted on 2003-04-02 (7 Comments)
Solution Computed by Charlie (2003-04-02 03:22:19)
Difficulty: 3 of 5Under Rise of an object-Physics (in Science)
Posted on 2003-04-01 (16 Comments)
re: In vacuum or in air... by Charlie (2003-04-01 09:20:25)
Solution In vacuum or in air... by Charlie (2003-04-01 09:09:11)
Difficulty: 3 of 5Under Cool it fast... (in Science)
Posted on 2003-04-01 (21 Comments)
Some Thoughts Perhaps... by Charlie (2003-04-01 05:19:29)
Difficulty: 4 of 5Under Making Dice, Part 1 (in Shapes)
Posted on 2003-03-31 (7 Comments)
re(2): solution by Charlie (2003-03-31 10:21:09)
Solution solution by Charlie (2003-03-31 09:10:40)
Difficulty: 3 of 5Under Make it Even (in Probability)
Posted on 2003-03-30 (13 Comments)
Solution In fact... by Charlie (2003-03-30 05:54:11)
Difficulty: 3 of 5Under Happy Birthday (in Probability)
Posted on 2003-03-27 (7 Comments)
re: by Charlie (2003-09-29 20:17:37)
Difficulty: 3 of 5Under The floating mystery (in Science)
Posted on 2003-03-26 (8 Comments)
Solution solution by Charlie (2003-03-26 07:55:17)
Difficulty: 3 of 5Under Monkeys and Coconuts (in Logic)
Posted on 2003-03-26 (41 Comments)
re(5): Possible solution - smaller solution by Charlie (2003-03-27 09:28:47)
re(4): Possible solution - smaller solution by Charlie (2003-03-27 09:27:06)
Difficulty: 2 of 5Under Believe it or not (in General)
Posted on 2003-03-25 (27 Comments)
re(2): The official solution is entirely mistaken by Charlie (2004-03-07 15:42:33)
re: Well nitpick because by Charlie (2003-03-25 15:50:15)
thought by Charlie (2003-03-25 05:42:18)
Difficulty: 2 of 5Under Creating 5 weights (in Weights and Scales)
Posted on 2003-03-24 (10 Comments)
Solution Posted Solution Not Minimum by Charlie (2003-03-30 06:19:56)
re: solution ? by Charlie (2003-03-26 08:14:52)
Solution a solution by Charlie (2003-03-24 03:22:10)
Difficulty: 3 of 5Under Charity or Party? (in Just Math)
Posted on 2003-03-23 (7 Comments)
re: solution by Charlie (2003-03-24 05:28:52)
Solution solution by Charlie (2003-03-23 06:07:48)
Difficulty: 2 of 5Under Shuffled Cards (in Probability)
Posted on 2003-03-22 (11 Comments)
Solution re: Solution by Charlie (2003-03-22 09:53:46)
Difficulty: 3 of 5Under The Plan (in Logic)
Posted on 2003-03-21 (16 Comments)
Solution solution by Charlie (2003-03-21 08:02:16)
Difficulty: 3 of 5Under Mysteries of the English Language (in Word Problems)
Posted on 2003-03-20 (14 Comments)
re(2): Ghoti fish by Charlie (2003-03-23 14:38:39)
re: wheee by Charlie (2003-03-20 09:51:59)
Hints/Tips worthy of comment by Charlie (2003-03-20 08:40:16)
Difficulty: 4 of 5Under Around The World (in Logic)
Posted on 2003-03-20 (134 Comments)
re(6): The solution by Charlie (2003-04-20 04:36:10)
re(4): The solution by Charlie (2003-04-18 09:29:12)
re(2): The solution by Charlie (2003-04-16 05:07:39)
The solution by Charlie (2003-04-14 08:40:16)
Solution solution by Charlie (2003-03-20 03:15:03)
Difficulty: 5 of 5Under Thirteen Words (in Word Problems)
Posted on 2003-03-19 (14 Comments)
Hints/Tips re: A Solution - 127 letters by Charlie (2003-03-21 08:20:53)
Hints/Tips suggestion by Charlie (2003-03-20 03:28:24)
re(3): First steps - 13 by Charlie (2003-03-20 03:22:25)
Difficulty: 4 of 5Under The Flooble Code (in Probability)
Posted on 2003-03-18 (12 Comments)
re(4): incorrect solution? by Charlie (2003-03-26 14:00:29)
re(3): incorrect solution? by Charlie (2003-03-26 13:59:28)
re: to Cheradenine by Charlie (2003-03-25 15:33:51)
re: incorrect solution? by Charlie (2003-03-25 10:24:42)
Hints/Tips re: remaining solution by Charlie (2003-03-21 03:36:56)
Difficulty: 5 of 5Under The Best Strategy (in Logic)
Posted on 2003-03-18 (47 Comments)
re(7): regarding posted solution by Charlie (2003-03-29 09:59:35)
re(4): regarding posted solution by Charlie (2003-03-27 03:36:31)
re: solution by Charlie (2003-03-19 16:22:39)
Solution solution by Charlie (2003-03-19 16:10:38)
re(2): What's the distribution? by Charlie (2003-03-19 03:41:14)
re(2): solution to similar situation by Charlie (2003-03-19 03:09:22)
re(2): Monte Carlo Simulation (the program) by Charlie (2003-03-18 09:09:30)
re: Monte Carlo Simulation (continued) by Charlie (2003-03-18 08:55:05)
Monte Carlo Simulation by Charlie (2003-03-18 08:47:08)
Another difference by Charlie (2003-03-18 05:31:04)
Some Thoughts solution to similar situation by Charlie (2003-03-18 03:59:33)
Difficulty: 3 of 5Under True Day (in Logic)
Posted on 2003-03-17 (10 Comments)
re: Confusion by Charlie (2003-03-17 17:09:11)
Solution solution by Charlie (2003-03-17 03:27:48)
Difficulty: 3 of 5Under Rupees and Paise (in Just Math)
Posted on 2003-03-16 (15 Comments)
re(2): A different interpretation by Charlie (2003-03-17 03:45:11)
Difficulty: 4 of 5Under Divisibility (in Just Math)
Posted on 2003-03-14 (9 Comments)
Some Thoughts vague outline by Charlie (2003-03-18 03:48:29)
re(2): conceptual solution by Charlie (2003-03-18 03:27:52)
re: conceptual solution by Charlie (2003-03-17 03:58:40)
Difficulty: 4 of 5Under Find the rule... (in Sequences)
Posted on 2003-03-13 (7 Comments)
How to Cheat by Charlie (2003-03-17 17:16:55)
Difficulty: 2 of 5Under Jury selection (in Logic)
Posted on 2003-03-13 (19 Comments)
Solution Since this is a logic puzzle--not the real world... by Charlie (2003-03-13 09:29:34)
Difficulty: 5 of 5Under Probability of All of a Set (in Probability)
Posted on 2003-03-13 (11 Comments)
re: Complete Solution by Charlie (2003-03-17 17:25:47)
re(3): Done !!!! by Charlie (2003-03-15 19:06:04)
re: Done !!!! by Charlie (2003-03-15 06:58:09)
Difficulty: 3 of 5Under Earth's Momentum (in Science)
Posted on 2003-03-12 (16 Comments)
re(5): I disagree - me too, with you by Charlie (2004-09-28 08:08:15)
re(3): I disagree - me too, with you by Charlie (2004-09-27 10:20:47)
Difficulty: 2 of 5Under Hats off (in Logic)
Posted on 2003-03-11 (16 Comments)
re(3): solution in my world by Charlie (2003-03-12 04:49:02)
Difficulty: 2 of 5Under Water level (in Science)
Posted on 2003-03-10 (20 Comments)
Solution re(2): depends on the density--Another solution by Charlie (2003-03-21 09:14:13)
Difficulty: 3 of 5Under Cattle Selling (in Just Math)
Posted on 2003-03-10 (12 Comments)
Regarding the Official Solution by Charlie (2003-03-13 08:42:45)
With the new rupee total--a solution or several by Charlie (2003-03-11 03:23:07)
re(4): Error in the question? -- Yes on third thought. by Charlie (2003-03-10 07:57:14)
re(2): Error in the question? -- No, wait a second! by Charlie (2003-03-10 07:16:20)
Question re: Error in the question? by Charlie (2003-03-10 05:10:56)
Difficulty: 3 of 5Under Duel (in Probability)
Posted on 2003-03-06 (4 Comments)
Solution solution by Charlie (2003-03-07 04:08:18)
Difficulty: 2 of 5Under Counting Stamps (in Numbers)
Posted on 2003-03-06 (21 Comments)
re: postage by Charlie (2003-03-06 03:54:22)
Difficulty: 2 of 5Under Four words (in Word Problems)
Posted on 2003-03-05 (22 Comments)
re(3): hmm by Charlie (2003-03-08 09:21:32)
Cheating, we get... by Charlie (2003-03-05 15:41:46)
Difficulty: 3 of 5Under Composite numbers (in Numbers)
Posted on 2003-03-05 (23 Comments)
re: Moore's Law at work by Charlie (2016-11-17 15:58:51)
re(3): Smaller solution? by Charlie (2003-03-08 09:40:31)
re(2): Smaller solution? by Charlie (2003-03-08 09:37:44)
re: Smallest solution by Charlie (2003-03-07 07:12:27)
re: Smaller solution? by Charlie (2003-03-07 04:39:28)
Solution solution by Charlie (2003-03-06 13:09:15)
Difficulty: 3 of 5Under Age Difference (in Numbers)
Posted on 2003-03-02 (7 Comments)
Solution Solution by Charlie (2003-03-02 10:15:14)
Difficulty: 3 of 5Under Remainder (in Numbers)
Posted on 2003-03-01 (17 Comments)
re: Step by Step by Charlie (2003-03-02 09:35:51)
Step by Step by Charlie (2003-03-02 09:32:32)
Brute force #1 by Charlie (2003-03-02 09:21:08)
Some Thoughts Factor the 1990? by Charlie (2003-03-02 09:16:10)
Difficulty: 1 of 5Under Flowers (in General)
Posted on 2003-03-01 (19 Comments)
Solution re: possibilities by Charlie (2003-03-05 07:51:47)
re(2): Already not the latest... another solution by Charlie (2003-03-02 09:44:12)
Solution Already not the latest... solution by Charlie (2003-03-01 11:48:43)
Difficulty: 4 of 5Under Non-Attacking Chess Pieces (in Games)
Posted on 2003-02-27 (12 Comments)
re: What's a rotation? by Charlie (2004-03-05 14:15:47)
re: Another Solution by Charlie (2003-12-31 15:29:01)
Spoilers (for DJ)--the program by Charlie (2003-08-28 09:09:27)
re: Not clear by Charlie (2003-03-03 16:29:20)
Difficulty: 2 of 5Under Three Playing Cards (in General)
Posted on 2003-02-26 (12 Comments)
Solution solution by Charlie (2003-02-26 03:29:57)
Difficulty: 3 of 5Under The Ten Statements (in Logic)
Posted on 2003-02-25 (62 Comments)
re: Without exactly by Charlie (2003-03-19 16:34:08)
Difficulty: 3 of 5Under Talking gibberish (in Riddles)
Posted on 2003-02-23 (22 Comments)
re: Answer by Charlie (2003-02-23 10:21:31)
Solution Answer by Charlie (2003-02-23 04:40:39)
Difficulty: 5 of 5Under Dice Proposition (in Probability)
Posted on 2003-02-22 (5 Comments)
Hints/Tips Hint by Charlie (2003-02-23 04:46:10)
Difficulty: 3 of 5Under Harder Puzzle (in General)
Posted on 2003-02-21 (10 Comments)
re: that answer by Charlie (2003-02-21 05:10:39)
Difficulty: 3 of 5Under Counting digits (in Numbers)
Posted on 2003-02-20 (24 Comments)
re(3): And they are... by Charlie (2003-03-09 07:21:05)
re: check this out (where did it go wrong?) by Charlie (2003-03-02 10:52:57)
re(2): And they are... by Charlie (2003-02-26 08:20:19)
And they are... by Charlie (2003-02-25 18:42:33)
Difficulty: 3 of 5Under So obvious....? (in Logic)
Posted on 2003-02-19 (38 Comments)
re: True answer by Charlie (2003-03-12 04:28:46)
re(6): A solution by Charlie (2003-02-21 04:49:40)
re(4): A solution by Charlie (2003-02-19 18:31:09)
Difficulty: 4 of 5Under Sequential seasonings (in Sequences)
Posted on 2003-02-19 (10 Comments)
Some Thoughts Almost Clueless--Random Thoughts by Charlie (2003-02-19 10:08:48)
Difficulty: 3 of 5Under Greetings (in Riddles)
Posted on 2003-02-18 (34 Comments)
re(5): question by Charlie (2003-02-19 13:52:15)
re(2): question by Charlie (2003-02-19 02:24:22)
re: hint by Charlie (2003-02-18 09:59:53)
Difficulty: 4 of 5Under The flooble question (in General)
Posted on 2003-02-18 (52 Comments)
re: Sorry by Charlie (2003-03-13 18:37:47)
re(2): Seeing as how by Charlie (2003-03-13 09:12:16)
re: I don't know but.... by Charlie (2003-03-08 11:41:06)
Solution Looking back at the rules. by Charlie (2003-03-05 05:00:25)
Solution re: Solution? by Charlie (2003-03-05 03:26:33)
re: To restate everything by Charlie (2003-03-04 03:58:33)
Solution Extra challenge. by Charlie (2003-03-04 03:46:00)
Solution Solution? by Charlie (2003-03-04 03:33:43)
re(3): To restate everything by Charlie (2003-03-03 16:18:32)
re: To restate everything by Charlie (2003-02-28 04:05:14)
re: How the voting works by Charlie (2003-02-18 09:54:09)
re: crazy (for lack of a better subject) by Charlie (2003-02-18 07:08:42)
re: crazy (for lack of a better subject) by Charlie (2003-02-18 06:46:59)
re(3): First guess by Charlie (2003-02-18 06:27:45)
re(2): First guess by Charlie (2003-02-18 06:20:45)
re: First guess by Charlie (2003-02-18 05:53:20)
Solution re(9): First guess by Charlie (2003-02-18 05:49:32)
Solution re(8): First guess by Charlie (2003-02-18 05:47:18)
Solution re(7): First guess by Charlie (2003-02-18 05:45:39)
Solution re(6): First guess by Charlie (2003-02-18 05:43:56)
Solution re(5): First guess by Charlie (2003-02-18 05:42:02)
Solution re(4): First guess by Charlie (2003-02-18 05:40:46)
re(3): First guess by Charlie (2003-02-18 05:39:44)
Solution re(2): First guess by Charlie (2003-02-18 05:38:36)
re: First guess by Charlie (2003-02-18 05:37:05)
re(4): First guess by Charlie (2003-02-18 05:27:53)
re(3): First guess by Charlie (2003-02-18 05:26:31)
re(2): First guess by Charlie (2003-02-18 05:24:46)
re: First guess by Charlie (2003-02-18 05:20:24)
Difficulty: 3 of 5Under The Peanuts (in Probability)
Posted on 2003-02-18 (11 Comments)
re: Slight Correction by Charlie (2003-02-24 09:13:00)
Slight Correction by Charlie (2003-02-24 09:08:21)
Simulation confirmation of probability by Charlie (2003-02-23 11:31:12)
Solution re(2): Ground Rules and First Thoughts by Charlie (2003-02-19 03:21:09)
Hints/Tips re: Ground Rules and First Thoughts by Charlie (2003-02-19 03:16:03)
Difficulty: 3 of 5Under 5 weights (in Weights and Scales)
Posted on 2003-02-13 (6 Comments)
re(2): Weights and Scales by Charlie (2003-02-23 10:49:33)
Difficulty: 2 of 5Under BlackJack (in Probability)
Posted on 2003-02-12 (12 Comments)
Solution re(2): Decks? by Charlie (2003-02-13 03:55:01)
Difficulty: 1 of 5Under 3 From 1 (in Word Problems)
Posted on 2003-02-11 (20 Comments)
re(5): Another... by Charlie (2003-10-23 15:43:50)
re(4): Another... by Charlie (2003-10-23 15:31:48)
re: Not a small list by Charlie (2003-07-25 09:38:30)
Difficulty: 3 of 5Under Plus and Minus (in Numbers)
Posted on 2003-02-05 (7 Comments)
re: solution by Charlie (2003-06-05 10:14:26)
Solution solution by Charlie (2003-06-05 10:01:12)
Difficulty: 3 of 5Under Puppies (in Logic)
Posted on 2003-01-30 (18 Comments)
Solution re: solution? by Charlie (2003-02-04 09:39:27)
Difficulty: 3 of 5Under Kings and Queens (in General)
Posted on 2003-01-30 (15 Comments)
re: Unique solution - others wrong.... by Charlie (2007-06-18 16:01:23)
re(2): full solution by Charlie (2003-01-31 09:43:20)
Difficulty: 4 of 5Under The Three Logicians - (in Logic)
Posted on 2003-01-22 (14 Comments)
Only one of three solutions valid by Charlie (2003-01-29 04:50:22)
Difficulty: 4 of 5Under 9 labels and 9 jars (in Probability)
Posted on 2002-12-09 (15 Comments)
re(3): SOLUTION IS WRONG by Charlie (2003-03-24 10:20:32)
Difficulty: 3 of 5Under Princeton's Prime Problem (in Numbers)
Posted on 2002-11-18 (9 Comments)
re: Isnt this true for any odd number? by Charlie (2010-09-14 15:41:31)
Difficulty: 1 of 5Under Half or not (in Riddles)
Posted on 2002-11-14 (28 Comments)
Another Solution by Charlie (2003-02-21 04:10:07)
Difficulty: 2 of 5Under A locked 7-11?! (in Riddles)
Posted on 2002-11-11 (28 Comments)
In addition by Charlie (2003-07-05 09:37:27)
Difficulty: 3 of 5Under Equation drawing (in Numbers)
Posted on 2002-11-10 (12 Comments)
My two bits by Charlie (2003-02-19 16:50:03)
Difficulty: 5 of 5Under Special triangle in any triangle (in Geometry)
Posted on 2002-11-05 (20 Comments)
re: Hey by Charlie (2003-02-10 05:13:56)
Difficulty: 4 of 5Under Big Circle, Little Circle (in Geometry)
Posted on 2002-11-03 (16 Comments)
re: Calculus solution by Charlie (2003-02-15 17:03:03)
Solution Calculus solution by Charlie (2003-02-15 14:46:55)
re: functions by Charlie (2003-02-11 05:35:26)
Difficulty: 5 of 5Under Quarter intersection Problem (in Geometry)
Posted on 2002-10-30 (10 Comments)
re: Solution (can somebody check my math?) by Charlie (2003-02-10 10:05:33)
Difficulty: 4 of 5Under Red ball... Red ball (in Probability)
Posted on 2002-10-17 (17 Comments)
Another solution (re: a mathematecally more rigorous solution) by Charlie (2003-02-17 14:36:06)
Difficulty: 3 of 5Under Climbing the stairs (in Numbers)
Posted on 2002-09-05 (24 Comments)
re(3): who's Fibonacci? Simple answer by Charlie (2003-09-01 10:56:56)
Difficulty: 3 of 5Under Self-Descriptor (in Numbers)
Posted on 2002-07-10 (14 Comments)
re: computer solution -- examples of convergence by Charlie (2009-03-30 11:40:33)
Solution computer solution by Charlie (2009-03-30 11:23:32)
Difficulty: 2 of 5Under Circular Logic (in Shapes)
Posted on 2002-07-03 (26 Comments)
re(2): If 25pc of the Square is shaded... by Charlie (2014-03-14 21:18:22)
Difficulty: 5 of 5Under Bascule's Book (in Probability)
Posted on 2002-07-03 (41 Comments)
re: Starting digit by Charlie (2003-02-03 09:26:06)
Difficulty: 3 of 5Under Maze (in Probability)
Posted on 2002-06-26 (54 Comments)
I'm not getting something. by Charlie (2003-02-23 10:43:15)
Difficulty: 5 of 5Under Minimum Value (in Calculus)
Posted on 2002-06-19 (18 Comments)
Solution Excel Agrees by Charlie (2003-04-01 05:06:02)
Difficulty: 2 of 5Under Chocolate! (in Shapes)
Posted on 2002-06-12 (13 Comments)
re: bob is right (where did the other row go?) by Charlie (2003-04-11 10:16:31)
Difficulty: 3 of 5Under A birthday gamble (in Probability)
Posted on 2002-05-28 (8 Comments)
re: Puzzle Solution by Charlie (2022-01-02 15:20:55)
Difficulty: 4 of 5Under A blue taxi (in Probability)
Posted on 2002-05-24 (17 Comments)
re: kind of on the same lines...... by Charlie (2007-02-21 09:39:17)
A more paradoxical version. by Charlie (2003-03-26 14:09:57)
Difficulty: 5 of 5Under From A to B (in Just Math)
Posted on 2002-05-15 (14 Comments)
Simpler Algebra by Charlie (2003-02-10 02:50:33)
Difficulty: 3 of 5Under Trading cards (in Probability)
Posted on 2002-05-03 (39 Comments)
re(2): a method of solving problem A by Charlie (2003-02-06 09:07:50)
Solution re: a method of solving problem A by Charlie (2003-02-06 09:01:32)
Hints/Tips re: Another analytic solution to problem B by Charlie (2003-02-06 05:55:44)
re(2): a method of solving problem B by Charlie (2003-02-05 08:57:29)
Hints/Tips re: a method of solving problem B by Charlie (2003-02-05 08:53:56)
re(2): Analytic solution, A and B missing parens added by Charlie (2003-02-05 08:36:48)
re: Analytic solution, A and B missing parens added by Charlie (2003-01-31 09:17:10)
Solution Analytic solution, A and B by Charlie (2003-01-31 08:33:22)
Analytic Solution to Part B(ctd.--part 3) by Charlie (2003-01-30 10:01:13)
Analytic Solution to Part B (ctd.) by Charlie (2003-01-30 09:59:15)
Analytic Solution to Part B by Charlie (2003-01-30 09:56:57)
re(3): Simulation results by Charlie (2003-01-29 17:01:55)
re(3): Simulation results by Charlie (2003-01-29 17:00:45)
re: Simulation results by Charlie (2003-01-29 10:15:58)
Difficulty: 2 of 5Under Division by three (in Numbers)
Posted on 2002-04-24 (21 Comments)
re(10): the solution posted is WRONG!!!! by Charlie (2003-06-07 06:49:12)
re(8): the solution posted is WRONG!!!! by Charlie (2003-06-05 16:27:38)
re(7): the solution posted is WRONG!!!! by Charlie (2003-06-05 16:14:26)
re(5): the solution posted is WRONG!!!! by Charlie (2003-06-05 06:43:12)
Difficulty: 2 of 5Under 10 trees (in Shapes)
Posted on 2002-04-21 (11 Comments)
re: dope by Charlie (2004-02-16 10:58:04)
Difficulty: 3 of 5Under Move the 2 - double the number (in Numbers)
Posted on 2002-04-19 (10 Comments)
another method by Charlie (2003-06-04 04:01:16)
Difficulty: 2 of 5Under Simple coins (in Probability)
Posted on 2002-04-09 (45 Comments)
Solution re: Answer by Charlie (2014-07-06 10:46:13)
Solution re(2): Question On The Solution by Charlie (2007-10-24 10:38:57)
re: Question On The Solution by Charlie (2007-10-24 10:11:44)
re(4): Solution Using Real Prob/Stats by Charlie (2003-12-03 22:00:28)
re: People! Get a clue! by Charlie (2003-08-03 07:10:11)
re(3): I think the solution is WRONG by Charlie (2003-05-31 08:50:14)
re(3): It's not 1/3 the way the problem was posed. by Charlie (2003-04-11 08:57:28)
re(2): It's not 1/3 the way the problem was posed. by Charlie (2003-04-11 08:54:30)
It's not 1/3 the way the problem was posed. by Charlie (2003-02-21 08:40:30)
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