Under Recovering the number (in Numbers) Posted on 2019-02-13 (2 Comments) |

| bonus by Charlie (2019-02-13 13:43:15) |

Under The Cut Cube (in Shapes) Posted on 2019-02-13 (4 Comments) |

| solution by Charlie (2019-02-13 12:25:24) |

Under Can you C it? (in Word Problems) Posted on 2019-02-06 (21 Comments) |

| if... by Charlie (2019-02-06 12:22:21) |

Under 3 coprime unknowns (in Numbers) Posted on 2019-02-04 (2 Comments) |

| computer solution by Charlie (2019-02-04 11:55:20) |

Under Integers inside surds (in Numbers) Posted on 2019-02-03 (2 Comments) |

| computer doesn't mind tedium, and discovers duplicates by Charlie (2019-02-06 12:56:35) |

Under Neighbors differ by even numbers (in Numbers) Posted on 2019-02-01 (1 Comments) |

| computer-aided solution by Charlie (2019-02-01 16:26:57) |

Under OMG Equation (in Just Math) Posted on 2019-02-01 (1 Comments) |

| Wolfram Alpha's solution by Charlie (2019-02-01 13:23:48) |

Under Only prime digits allowed (in Numbers) Posted on 2019-01-31 (1 Comments) |

| computer solution by Charlie (2019-01-31 15:57:31) |

Under 48th digit in the head (in Just Math) Posted on 2019-01-30 (4 Comments) |

| certainly not in my head (but spoiler present anyway) by Charlie (2019-01-30 15:02:06) |

Under Consistency parameter (in Just Math) Posted on 2019-01-30 (3 Comments) |

| solution by Charlie (2019-01-30 11:38:01) |

Under An enumeration problem (in Just Math) Posted on 2019-01-28 (1 Comments) |

| Let me enumerate the ways -- computer solution by Charlie (2019-01-28 15:58:38) |

Under Digit Hunting (in Just Math) Posted on 2019-01-26 (4 Comments) |

| by computer calculation by Charlie (2019-01-26 15:09:29) |

Under Uniform distribution (in Probability) Posted on 2019-01-25 (9 Comments) |

| re: computer solution by Charlie (2019-01-26 16:22:06) |

| computer solution by Charlie (2019-01-26 15:47:54) |

Under 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) |

| computer solution--all ways by Charlie (2019-01-25 09:08:22) |

Under Digit Anagram (in Numbers) Posted on 2019-01-24 (3 Comments) |

| some examples--for what they're worth by Charlie (2019-01-24 10:27:13) |

Under Smooth Sum Situation (in Sequences) Posted on 2019-01-23 (3 Comments) |

| computer sum; dumb way and smarter way by Charlie (2019-01-23 15:42:55) |

Under Worm ate the numbers (in Numbers) Posted on 2019-01-18 (2 Comments) |

| computer solution by Charlie (2019-01-19 13:36:45) |

Under Factorial Tremors (in Numbers) Posted on 2019-01-16 (4 Comments) |

| re: Guess by Charlie (2019-01-16 15:20:02) |

Under Dial W for WORD (in Word Problems) Posted on 2019-01-15 (1 Comments) |

| No Subject by Charlie (2019-01-15 15:55:46) |

Under Reach home (in Just Math) Posted on 2019-01-14 (11 Comments) |

| conjecture by Charlie (2019-01-14 16:26:06) |

Under Sine recurrence (in Just Math) Posted on 2019-01-08 (6 Comments) |

| computer solution by Charlie (2019-01-08 11:22:15) |

| re: @ DAK by Charlie (2019-01-08 08:20:15) |

Under Defining a number (in Numbers) Posted on 2019-01-05 (2 Comments) |

| computer solutions by Charlie (2019-01-05 13:47:53) |

Under 4 or more primes (in Numbers) Posted on 2019-01-03 (3 Comments) |

| computer solution by Charlie (2019-01-03 12:42:41) |

Under Ring in the New - again and again and again.. (in Numbers) Posted on 2019-01-01 (2 Comments) |

| playing with the computer in UBASIC by Charlie (2019-01-01 14:53:34) |

Under 24 pre-scheduled dates (in Just Math) Posted on 2018-12-31 (1 Comments) |

| computer-aided solution by Charlie (2018-12-31 22:42:41) |

Under Double perfection (in Numbers) Posted on 2018-12-28 (1 Comments) |

| computer solution by Charlie (2018-12-28 15:26:08) |

Under Restoring a multiplication sample (in Just Math) Posted on 2018-12-27 (1 Comments) |

| computer solutions by Charlie (2018-12-27 11:12:58) |

Under Same digits (in Numbers) Posted on 2018-12-26 (5 Comments) |

| re(2): computer solution by Charlie (2018-12-26 20:02:17) |

| computer solution by Charlie (2018-12-26 10:24:13) |

Under Probably Acute (in Just Math) Posted on 2018-12-21 (11 Comments) |

| re: simulation results by Charlie (2018-12-25 13:18:12) |

| re: Not one answer by Charlie (2018-12-22 08:34:36) |

| simulation results by Charlie (2018-12-21 10:58:56) |

Under Restoring a definition (in Word Problems) Posted on 2018-12-19 (1 Comments) |

| approximate solution -- researched by Charlie (2018-12-19 16:03:46) |

Under Concentric Circles and Equilateral Triangle (in Just Math) Posted on 2018-12-15 (2 Comments) |

| GSP Approximation by Charlie (2018-12-15 15:51:06) |

Under Colored triangle (in Sequences) Posted on 2018-12-14 (9 Comments) |

| in case this helps guide the analysis by Charlie (2018-12-14 21:26:20) |

Under All digits distinct (in Numbers) Posted on 2018-12-12 (2 Comments) |

| computer solution by Charlie (2018-12-12 15:15:17) |

Under A short list (in Numbers) Posted on 2018-12-11 (2 Comments) |

| computer solution by Charlie (2018-12-11 11:08:27) |

Under The 100th number (in Sequences) Posted on 2018-12-10 (7 Comments) |

| re(3): Hint by Charlie (2019-01-11 11:44:45) |

Under Maximal number of solutions (in Just Math) Posted on 2018-12-08 (5 Comments) |

| Basic language solution by Charlie (2018-12-09 10:13:45) |

Under 8 distinct partitions (in Numbers) Posted on 2018-12-06 (6 Comments) |

| re(2): computer solution by Charlie (2018-12-07 07:23:18) |

| computer solution by Charlie (2018-12-06 22:40:19) |

Under Square after square creates a new square (in Numbers) Posted on 2018-12-05 (3 Comments) |

| supplement containing non-trivializing zeros by Charlie (2018-12-05 10:56:08) |

| computer solution by Charlie (2018-12-05 10:28:31) |

Under Evaluate the sum (in Sequences) Posted on 2018-12-01 (5 Comments) |

| solution based on previous comments by Charlie (2018-12-02 14:05:51) |

Under Mean Diagonals (in Calculus) Posted on 2018-11-23 (4 Comments) |

| one probably wrong way to go about it by Charlie (2018-11-23 11:42:02) |

Under From sum to addends (in Just Math) Posted on 2018-11-22 (1 Comments) |

| answer by Charlie (2018-11-23 11:23:55) |

Under 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) |

| computer solution and partial investigation of the bonus by Charlie (2018-11-21 12:10:34) |

Under New word from two others (in Word Problems) Posted on 2018-11-18 (9 Comments) |

| computer failure to find solution by Charlie (2018-11-18 11:45:06) |

Under Sine of Squared (in Calculus) Posted on 2018-11-15 (5 Comments) |

| re: computer solution by Charlie (2018-11-15 11:35:32) |

| computer solution by Charlie (2018-11-15 11:17:41) |

Under Body parts (in Riddles) Posted on 2018-11-06 (5 Comments) |

| what I was thinking by Charlie (2018-11-06 13:32:34) |

Under 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) |

Under Duelling pairs (in Games) Posted on 2018-11-02 (2 Comments) |

| computer-aided solution by Charlie (2018-11-02 15:17:15) |

| starting up by Charlie (2018-11-02 13:08:37) |

Under Defining a sequence (in Just Math) Posted on 2018-10-31 (3 Comments) |

| re: one soln by Charlie (2018-10-31 10:20:18) |

Under 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) |

Under Some slack (in Geometry) Posted on 2018-10-29 (2 Comments) |

| my solution by Charlie (2018-10-29 10:26:14) |

Under 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) |

Under The wisdom of Windsor (in Word Problems) Posted on 2018-10-26 (2 Comments) |

| via some research by Charlie (2018-10-27 15:59:26) |

Under Chain of Primes (in Numbers) Posted on 2018-10-23 (3 Comments) |

| re: p&p soln by Charlie (2018-10-24 16:21:53) |

Under Squares needing 2 digits only (in Numbers) Posted on 2018-10-21 (3 Comments) |

| computer solution by Charlie (2018-10-21 19:41:09) |

Under A series of primes equals N (in Numbers) Posted on 2018-10-19 (2 Comments) |

| computer solution by Charlie (2018-10-19 11:53:38) |

Under Parcelation (in Geometry) Posted on 2018-10-18 (2 Comments) |

| solution by Charlie (2018-10-18 12:43:00) |

Under 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) |

Under Box of balls (in Probability) Posted on 2018-10-16 (6 Comments) |

| solution by Charlie (2018-10-16 11:33:43) |

Under Introducing sphenic numbers (in Numbers) Posted on 2018-10-14 (3 Comments) |

| solution by Charlie (2018-10-14 17:35:31) |

Under Emirps census (in Sequences) Posted on 2018-10-12 (2 Comments) |

| computer-aided solution by Charlie (2018-10-12 12:05:22) |

Under 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) |

Under Calling spade a spade (in Numbers) Posted on 2018-10-07 (1 Comments) |

| computer solution by Charlie (2018-10-07 11:11:39) |

Under Feathers of different colors (in Numbers) Posted on 2018-10-06 (2 Comments) |

| computer-assisted solution and extension (spoiler) by Charlie (2018-10-06 11:28:05) |

Under 2Z out (in Sequences) Posted on 2018-10-05 (2 Comments) |

| solution by Charlie (2018-10-05 14:52:53) |

Under At least 3 zeroes (in Sequences) Posted on 2018-10-03 (5 Comments) |

| solution by Charlie (2018-10-03 11:58:11) |

Under Monty Hall variant (in Probability) Posted on 2018-09-30 (6 Comments) |

| Monty Hall by Charlie (2018-09-30 10:04:33) |

| strategy (spoiler) by Charlie (2018-09-30 09:34:57) |

Under Prime phone (in Numbers) Posted on 2018-09-28 (1 Comments) |

| computer solution by Charlie (2018-09-28 10:56:13) |

Under Any conclusions? (in Logic) Posted on 2018-09-26 (2 Comments) |

| a conclusion by Charlie (2018-09-26 10:48:24) |

Under 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) |

| mostly a discussion by Charlie (2018-09-25 09:48:16) |

Under A logical search (in Numbers) Posted on 2018-09-24 (4 Comments) |

| non-preferred solution and extension by Charlie (2018-09-24 12:58:00) |

Under Jeopardy style (in Just Math) Posted on 2018-09-23 (2 Comments) |

| another correct response by Charlie (2018-09-23 14:35:46) |

Under Name the sequence (in Sequences) Posted on 2018-09-17 (5 Comments) |

| re: Sequence Name by Charlie (2018-09-17 22:26:19) |

Under A packing exercise (in Shapes) Posted on 2018-09-14 (5 Comments) |

| solution by Charlie (2018-09-14 15:54:23) |

Under 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) |

| re: proposed solution by Charlie (2018-09-08 17:15:12) |

| proposed solution by Charlie (2018-09-08 13:23:42) |

Under A Cone and a Sphere (in Just Math) Posted on 2018-09-07 (6 Comments) |

| My corrected solution by Charlie (2018-09-08 08:56:08) |

| re: attempted solution by Charlie (2018-09-07 14:05:47) |

| solution by Charlie (2018-09-07 13:57:30) |

Under 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) |

| proposed solution by Charlie (2018-09-06 10:54:35) |

Under Around the beast number (in Numbers) Posted on 2018-09-04 (4 Comments) |

| re: soln.s by Charlie (2018-09-04 20:11:16) |

Under Complicated Tangency (in Geometry) Posted on 2018-09-01 (2 Comments) |

| solution by Charlie (2018-09-01 14:37:37) |

Under A pet ant (in Shapes) Posted on 2018-08-31 (3 Comments) |

| solution by Charlie (2018-08-31 13:47:28) |

Under Ignoring an error (in Just Math) Posted on 2018-08-30 (2 Comments) |

| solution by Charlie (2018-08-30 14:31:32) |

Under Power tower (in Numbers) Posted on 2018-08-26 (1 Comments) |

| solution by Charlie (2018-08-26 13:39:29) |

Under A set of numbers (in Numbers) Posted on 2018-08-25 (1 Comments) |

| solution by Charlie (2018-08-25 15:45:55) |

Under 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) |

| heuristic computer solution by Charlie (2018-08-24 18:42:13) |

Under 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) |

| computer solution by Charlie (2018-08-23 10:00:05) |

Under Tax deduction (in Numbers) Posted on 2018-08-22 (6 Comments) |

| re(2): computer solution by Charlie (2018-08-22 13:11:22) |

| computer solution by Charlie (2018-08-22 10:39:55) |

Under What's next? (3) (in Sequences) Posted on 2018-08-19 (3 Comments) |

| researched solution by Charlie (2018-08-19 14:13:48) |

Under Just a search (in Numbers) Posted on 2018-08-18 (5 Comments) |

| computer solution by Charlie (2018-08-18 14:36:33) |

Under 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) |

| No Subject by Charlie (2018-08-17 14:23:48) |

Under Roll away (in Calculus) Posted on 2018-08-15 (4 Comments) |

| re: An approximate look by graphing by Charlie (2018-08-15 12:40:11) |

| An approximate look by graphing by Charlie (2018-08-15 11:50:18) |

Under Tippy table (in Shapes) Posted on 2018-08-14 (3 Comments) |

| solution by Charlie (2018-08-14 13:56:31) |

Under 31 created by 4 successive integers (in Numbers) Posted on 2018-08-13 (6 Comments) |

| answer (spoiler) by Charlie (2018-08-13 14:21:42) |

Under Quintuplet of consecutive primes (in Numbers) Posted on 2018-08-11 (4 Comments) |

| computer solution by Charlie (2018-08-11 13:42:49) |

Under Attendance Records (in Numbers) Posted on 2018-08-10 (4 Comments) |

| re: Solution by Charlie (2018-08-13 14:30:16) |

Under 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) |

| Don't get me started... (but) ... by Charlie (2018-08-09 09:41:01) |

Under Art is marching on.. (in Word Problems) Posted on 2018-08-08 (5 Comments) |

| from my word list by Charlie (2018-08-08 11:36:51) |

Under Shirtless ? Even nude! (in Numbers) Posted on 2018-08-07 (3 Comments) |

| computer solution by Charlie (2018-08-07 10:37:21) |

Under Call 911 (in Just Math) Posted on 2018-08-03 (2 Comments) |

| computer exploration (spoilers) by Charlie (2018-08-03 12:01:41) |

Under 1st 101-digit prime (in Numbers) Posted on 2018-08-02 (3 Comments) |

| computer solution by Charlie (2018-08-02 12:25:55) |

Under Lost in Translation (in General) Posted on 2018-07-31 (9 Comments) |

| first one by Charlie (2018-07-31 10:02:27) |

Under Ten to five (in Numbers) Posted on 2018-07-30 (7 Comments) |

| solution (spoiler) by Charlie (2018-07-30 11:03:24) |

Under 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) |

| computer solution and tidbits from a reference by Charlie (2018-07-29 13:06:40) |

Under Square - both ways (in Numbers) Posted on 2018-07-28 (3 Comments) |

| re: computer solutions by Charlie (2018-07-28 11:59:11) |

| computer solutions by Charlie (2018-07-28 11:43:29) |

Under 8191 has a partner (in Numbers) Posted on 2018-07-26 (3 Comments) |

| computer solution by Charlie (2018-07-26 11:26:45) |

Under Night Lights - Light Nights (in Science) Posted on 2018-07-24 (4 Comments) |

| my version by Charlie (2018-07-24 10:14:27) |

Under Odd-abundant numbers. (in Numbers) Posted on 2018-07-21 (2 Comments) |

| ... and then some by Charlie (2018-07-21 14:23:19) |

Under An Irrational Demand (in General) Posted on 2018-07-17 (8 Comments) |

| What do you do? by Charlie (2018-07-17 12:15:46) |

Under Garden Path (in General) Posted on 2018-07-16 (2 Comments) |

| browser issue on official solution by Charlie (2018-07-17 08:05:13) |

Under Truncatable primes (in Numbers) Posted on 2018-07-15 (2 Comments) |

| computer solution by Charlie (2018-07-15 19:20:58) |

Under From eleven to ... ETERNITY (in Numbers) Posted on 2018-07-14 (3 Comments) |

| computer solution by Charlie (2018-07-14 15:05:06) |

Under 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) |

| re: solution (part 1 only) by Charlie (2018-07-14 15:35:08) |

Under Aloof prime (in Numbers) Posted on 2018-07-12 (2 Comments) |

| discussion and solution by Charlie (2018-07-12 11:06:25) |

Under Probability of being coprime (in Probability) Posted on 2018-07-11 (4 Comments) |

| re: computer approximation (vs researched solution) by Charlie (2018-07-11 11:56:00) |

| computer approximation by Charlie (2018-07-11 10:59:31) |

Under Sliders II (in Word Problems) Posted on 2018-07-10 (5 Comments) |

| re: answers by Charlie (2018-07-10 10:57:39) |

Under 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) |

Under Sum of 4 squares (in Numbers) Posted on 2018-07-08 (4 Comments) |

| computer finding (no proof of completeness) by Charlie (2018-07-08 15:55:49) |

Under 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) |

| Basic language version by Charlie (2018-07-04 12:48:06) |

Under Who's on the second base? (in Numbers) Posted on 2018-07-01 (1 Comments) |

| solution by Charlie (2018-07-01 10:08:08) |

Under Astronomy: Binoculars, for fun and profit (in Science) Posted on 2018-06-29 (5 Comments) |

| re(2): Hint by Charlie (2018-07-05 19:58:20) |

| re: Hint by Charlie (2018-07-05 15:55:18) |

| How to... by Charlie (2018-06-29 13:40:52) |

Under 7 come zero (in Probability) Posted on 2018-06-28 (5 Comments) |

| solution by Charlie (2018-06-28 12:26:17) |

Under Save my spa! (in Science) Posted on 2018-06-27 (4 Comments) |

| spoiler if I did the math right by Charlie (2018-06-27 12:03:59) |

Under 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 by Charlie (2018-06-25 10:54:49) |

Under Sum of reciprocals (in Just Math) Posted on 2018-06-22 (2 Comments) |

| computer solution and research by Charlie (2018-06-22 13:10:49) |

Under 3 cubes (in Numbers) Posted on 2018-06-21 (2 Comments) |

| re: computer lists (spoilers for part a) -- continued, with mixed signs by Charlie (2018-06-21 14:44:30) |

| computer lists (spoilers for part a) by Charlie (2018-06-21 14:41:59) |

Under Non-zero integers (in Just Math) Posted on 2018-06-20 (3 Comments) |

| re: this seems the solution by Charlie (2018-06-20 13:36:31) |

| this seems the solution by Charlie (2018-06-20 13:22:51) |

Under Space guys (in Just Math) Posted on 2018-06-19 (2 Comments) |

| tabular approach (spoiler) by Charlie (2018-06-19 11:23:38) |

Under Counting ones (in Just Math) Posted on 2018-06-18 (2 Comments) |

| analytic solution, with computer verification by Charlie (2018-06-18 11:13:43) |

Under Square Divisiblity (in Numbers) Posted on 2018-06-17 (4 Comments) |

| thoughts by Charlie (2018-06-17 18:23:05) |

Under Play until you win (in Probability) Posted on 2018-06-15 (1 Comments) |

| Unsatisfying computer solution (spoiler) by Charlie (2018-06-15 12:08:54) |

Under 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) |

| computer solution by Charlie (2018-06-15 07:25:52) |

Under Cubes of couples (in Numbers) Posted on 2018-06-12 (2 Comments) |

| computer solution by Charlie (2018-06-12 16:08:02) |

Under 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) |

| very limited computer finding by Charlie (2018-06-08 21:21:36) |

Under a NEWS puzzle (in Just Math) Posted on 2018-06-07 (1 Comments) |

| computer solution by Charlie (2018-06-07 16:43:27) |

Under 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) |

| computer findings (spoilers) by Charlie (2018-06-06 12:31:27) |

Under Optimal result (in Just Math) Posted on 2018-06-04 (11 Comments) |

| hmmm... (spoiler) by Charlie (2018-06-04 10:48:14) |

Under 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) |

| computer solution by Charlie (2018-05-31 14:31:30) |

Under Thinking octal (in Numbers) Posted on 2018-05-30 (2 Comments) |

| VB program by Charlie (2018-05-30 10:25:17) |

Under What is the value of D? (in Just Math) Posted on 2018-05-27 (1 Comments) |

| computer to narrow the problem, then analysis of what's left by Charlie (2018-05-27 15:08:52) |

Under Ascending order (in Numbers) Posted on 2018-05-26 (1 Comments) |

| computer solution (spoiler) by Charlie (2018-05-26 13:00:57) |

Under How many drinks do you need? (in Numbers) Posted on 2018-05-25 (1 Comments) |

| computer solution by Charlie (2018-05-25 16:03:52) |

Under 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) |

| research and exploration (spoiler) by Charlie (2018-05-24 13:33:00) |

Under 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) |

| a. analytic, b. computer, solutions (spoilers for a and b) by Charlie (2018-05-23 13:47:34) |

Under Another True Story (in General) Posted on 2018-05-22 (1 Comments) |

| this must be how by Charlie (2018-05-22 09:49:08) |

Under High and low (in Word Problems) Posted on 2018-05-21 (3 Comments) |

| computer solution by Charlie (2018-05-21 10:35:42) |

Under 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) |

| computer solution by Charlie (2018-05-18 13:41:56) |

Under 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) |

Under From primes to palindromes (in Numbers) Posted on 2018-05-16 (4 Comments) |

| computer solution by Charlie (2018-05-16 13:37:46) |

| re: OEIS crossreferencing by Charlie (2018-05-16 13:35:57) |

Under What's Seven Got To Do With It? (in Sequences) Posted on 2018-05-14 (2 Comments) |

| computer extension by Charlie (2018-05-14 10:33:42) |

Under How about 138? (in Sequences) Posted on 2018-05-10 (4 Comments) |

| computer solution by Charlie (2018-05-10 14:28:13) |

Under Strongly related (in Just Math) Posted on 2018-05-05 (1 Comments) |

| computer solution by Charlie (2018-05-06 18:18:45) |

Under Some of these and some of those (in Numbers) Posted on 2018-04-30 (2 Comments) |

| Using the table function of a graphing calculator. by Charlie (2018-04-30 12:09:09) |

Under It is not 42 (in Numbers) Posted on 2018-04-29 (1 Comments) |

| computer solution by Charlie (2018-04-29 10:42:25) |

Under 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) |

| There must be a reason for the D3 rating. by Charlie (2018-04-26 10:16:46) |

Under XFL (in General) Posted on 2018-04-25 (3 Comments) |

| solution with games spelled out by Charlie (2018-04-25 11:38:24) |

Under When polynomial and trigo unite! (in Calculus) Posted on 2018-04-24 (1 Comments) |

| solution by Charlie (2018-04-24 12:52:29) |

Under Partitura (in Numbers) Posted on 2018-04-21 (2 Comments) |

| computer solution by Charlie (2018-04-21 15:55:57) |

Under An almost regular tetrahedron (in Geometry) Posted on 2018-04-20 (2 Comments) |

| re: solution -- What was I thinking? by Charlie (2018-04-21 17:19:13) |

| solution by Charlie (2018-04-20 13:18:39) |

Under A primer in Malaga (in Numbers) Posted on 2018-04-19 (1 Comments) |

| computer solution by Charlie (2018-04-19 14:52:49) |

Under The Devil 30-gon (in Geometry) Posted on 2018-04-17 (3 Comments) |

| computer-aided solution by Charlie (2018-04-17 11:38:15) |

Under 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) |

Under Find a Few Functions (in Calculus) Posted on 2018-04-15 (3 Comments) |

| success for part 1; not so much for part 2 by Charlie (2018-04-15 12:33:53) |

Under A pandigital set (in Numbers) Posted on 2018-04-14 (5 Comments) |

| computer solution by Charlie (2018-04-14 14:04:06) |

Under Prime stars (in Just Math) Posted on 2018-04-13 (2 Comments) |

| computer solution by Charlie (2018-04-13 12:05:10) |

Under Angle in an Equilateral Pentagon (in Geometry) Posted on 2018-04-12 (2 Comments) |

| the trig solution by Charlie (2018-04-12 10:55:33) |

Under 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) |

| computer lists possibilities; logic narrows down to actual answers by Charlie (2018-04-10 10:10:15) |

Under The royal sisters (in Just Math) Posted on 2018-04-09 (3 Comments) |

| computer assisted solution by Charlie (2018-04-09 10:40:40) |

Under Simple recursion (in Sequences) Posted on 2018-04-08 (1 Comments) |

| some thoughts by Charlie (2018-04-08 11:48:35) |

Under 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) |

| computer solution by Charlie (2018-04-05 12:27:33) |

Under Parenthetical Integer (in Numbers) Posted on 2018-04-04 (1 Comments) |

| computer solution with explanation that could have been used as an analytic solution (spoiler) by Charlie (2018-04-04 10:25:35) |

Under Cube Decomposition (in Geometry) Posted on 2018-04-02 (4 Comments) |

| solution with explanation by Charlie (2018-04-02 14:30:41) |

Under Better late than never ...HNY (in Just Math) Posted on 2018-04-01 (3 Comments) |

| The equation and the question. by Charlie (2018-04-01 19:33:29) |

Under Pascal Determinant (in Just Math) Posted on 2018-03-31 (3 Comments) |

| re: computer assisted solution by Charlie (2018-04-11 12:34:22) |

| computer assisted solution by Charlie (2018-03-31 14:28:37) |

Under Comb(k,2) (in Numbers) Posted on 2018-03-29 (4 Comments) |

| solutions through k=1,000,000 by Charlie (2018-03-29 10:11:46) |

Under One square implies many (in Sequences) Posted on 2018-03-28 (6 Comments) |

| BTW... by Charlie (2018-03-28 10:25:33) |

| solution assuming all members of the series are integers by Charlie (2018-03-28 10:14:13) |

Under Four singers (in Tricks) Posted on 2018-03-26 (3 Comments) |

| Is it a "Trick" or not? (spoiler) by Charlie (2018-03-26 10:41:59) |

Under Not enough information! (in Science) Posted on 2018-03-23 (7 Comments) |

| considering the simultaneity issue by Charlie (2018-03-24 13:11:48) |

| proposed solution by Charlie (2018-03-23 11:51:25) |

Under She has moved (in Numbers) Posted on 2018-03-22 (2 Comments) |

| How I went about it. by Charlie (2018-03-22 10:35:55) |

Under All in the USA (in Numbers) Posted on 2018-03-20 (2 Comments) |

| computer solution by Charlie (2018-03-20 15:05:39) |

Under six and thirteen (in Numbers) Posted on 2018-03-15 (8 Comments) |

| computer solution by Charlie (2018-03-15 11:55:36) |

Under A Really Weird Math Problem (in Numbers) Posted on 2018-03-12 (4 Comments) |

| re: Spoiler (I think . . .) by Charlie (2018-03-12 14:10:03) |

Under Another Dudeney problem (in Numbers) Posted on 2018-03-09 (2 Comments) |

| computer solution by Charlie (2018-03-09 12:21:01) |

Under Summing the factors (in Numbers) Posted on 2018-03-08 (2 Comments) |

| a solution by Charlie (2018-03-08 12:24:20) |

Under A palindromic equation (in Numbers) Posted on 2018-03-04 (3 Comments) |

| a computer aside (no spoiler) by Charlie (2018-03-04 11:44:38) |

Under The Truman Show (in Geometry) Posted on 2018-03-02 (4 Comments) |

| solution with error analysis by Charlie (2018-03-02 10:32:54) |

Under 15=5*3 (in Sequences) Posted on 2018-03-01 (1 Comments) |

| computer solution by Charlie (2018-03-01 15:40:50) |

Under Trailing zeros (in Numbers) Posted on 2018-02-28 (1 Comments) |

| analytic solution with computer verification by Charlie (2018-02-28 10:35:55) |

Under Square products (in Just Math) Posted on 2018-02-27 (3 Comments) |

| computer exploration by Charlie (2018-02-27 14:38:46) |

Under 4 digit number derived from a single digit (in Numbers) Posted on 2018-02-26 (3 Comments) |

| solution by Charlie (2018-02-26 12:15:47) |

Under Sum of subfactorials (in Numbers) Posted on 2018-02-25 (2 Comments) |

| computer solution by Charlie (2018-02-25 11:54:05) |

Under Completing a triplet (in Numbers) Posted on 2018-02-24 (5 Comments) |

| computer findings by Charlie (2018-02-24 14:05:52) |

Under A sixth power in many ways (in Numbers) Posted on 2018-02-22 (1 Comments) |

| solution by Charlie (2018-02-22 11:12:10) |

Under A state of a State (in General) Posted on 2018-02-19 (7 Comments) |

| re: no answer by Charlie (2018-02-20 10:58:42) |

| re: on first sight by Charlie (2018-02-19 13:54:08) |

Under Strictly non-palindromic numbers (in Numbers) Posted on 2018-02-18 (3 Comments) |

| computer exploration and solution to 3.5 parts by Charlie (2018-02-18 12:07:57) |

Under Double Secant (in Geometry) Posted on 2018-02-15 (3 Comments) |

| not a mathematical proof, but beyond a reasonable doubt by Charlie (2018-02-15 09:29:37) |

Under Four fours (in Numbers) Posted on 2018-02-14 (6 Comments) |

| re: minor tweak to three fours program; 7 goal numbers remain unsolved by Charlie (2018-02-14 23:02:47) |

| minor tweak to three fours program; 7 goal numbers remain unsolved by Charlie (2018-02-14 10:35:12) |

Under Using nine positive digits (in Numbers) Posted on 2018-02-11 (3 Comments) |

| solution in keeping with the title by Charlie (2018-02-11 14:38:55) |

Under En francais seulement ! (in Numbers) Posted on 2018-02-09 (3 Comments) |

| ummm.... by Charlie (2018-02-09 13:15:47) |

Under 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 (spoiler) by Charlie (2018-02-02 13:18:35) |

Under Cute numbers (in Numbers) Posted on 2018-02-01 (4 Comments) |

| re: Also by Charlie (2018-02-02 13:29:18) |

| solution by Charlie (2018-02-01 11:24:36) |

Under 113 together (in Just Math) Posted on 2018-01-30 (3 Comments) |

| the algebra and a variation by Charlie (2018-01-30 10:20:29) |

Under Quite a pair! (in Numbers) Posted on 2018-01-26 (2 Comments) |

| computer solution by Charlie (2018-01-26 14:13:29) |

Under Quadrilateral fill in the blank (in Shapes) Posted on 2018-01-25 (2 Comments) |

| playing with GSP -- no proof by Charlie (2018-01-25 10:31:54) |

Under 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) |

Under Champagnat numbers (in Just Math) Posted on 2018-01-23 (2 Comments) |

| a proof by Charlie (2018-01-23 15:00:21) |

Under The Sleeping Beauty problem (in Probability) Posted on 2018-01-22 (4 Comments) |

| solution by Charlie (2018-01-22 12:29:25) |

Under Quite a coincidence (in Just Math) Posted on 2018-01-19 (6 Comments) |

| proposed solution by Charlie (2018-01-19 11:41:55) |

Under A set of subsets (in Just Math) Posted on 2018-01-17 (2 Comments) |

| computer solution by Charlie (2018-01-17 11:37:00) |

Under Fair slices (in Geometry) Posted on 2018-01-16 (8 Comments) |

| re: To avoid kids figthting by Charlie (2018-01-17 11:42:03) |

Under Get even (in Numbers) Posted on 2018-01-15 (3 Comments) |

| solution transcribed from pencil and paper, with explanation added by Charlie (2018-01-15 10:01:01) |

Under Funny way to divide by seven (in Numbers) Posted on 2018-01-12 (3 Comments) |

| computer finding of numbers that can be divided that way by Charlie (2018-01-12 19:33:39) |

Under 15 letter 'words' (in Just Math) Posted on 2018-01-11 (1 Comments) |

| 2 algorithms same answer--computer assisted (spoiler) by Charlie (2018-01-11 16:21:19) |

Under Discounting one (in Numbers) Posted on 2018-01-10 (9 Comments) |

| re: if you allow negatives by Charlie (2018-01-10 20:32:41) |

| 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) |

| The only way to do it. (computer solution included) by Charlie (2018-01-10 14:04:44) |

Under A meeting point (in Just Math) Posted on 2018-01-07 (2 Comments) |

| solution by Charlie (2018-01-07 12:24:25) |

Under 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) |

| An aside, beyond the solution by Charlie (2018-01-06 16:02:12) |

Under Simple fractions (in Just Math) Posted on 2018-01-03 (3 Comments) |

| Treating as probabilities by Charlie (2018-01-03 15:54:38) |

Under 5-digit number (in Just Math) Posted on 2018-01-02 (2 Comments) |

| assuming beforehand that the title is meaningful by Charlie (2018-01-02 13:31:46) |

Under 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) |

| computer solution finds one more by Charlie (2017-12-30 15:37:48) |

Under Pandigital and divisible (in Numbers) Posted on 2017-12-29 (3 Comments) |

| computer solution (spoiler) by Charlie (2017-12-29 11:15:53) |

Under A prime nonuplet (in Numbers) Posted on 2017-12-27 (4 Comments) |

| computer solution (spoiler) by Charlie (2017-12-27 12:47:03) |

Under Expanding the railroad line (in Just Math) Posted on 2017-12-26 (2 Comments) |

| computer solutions by Charlie (2017-12-26 13:51:49) |

Under The Young Girl's Age (in Just Math) Posted on 2017-12-25 (2 Comments) |

| computer solution (spoiler) by Charlie (2017-12-25 14:37:12) |

Under Persistence I (in Numbers) Posted on 2017-12-24 (2 Comments) |

| some analysis; some computation-- solution except for b) in base 3. by Charlie (2017-12-24 14:13:06) |

Under Do not say ONE (in Games) Posted on 2017-12-23 (2 Comments) |

| Researched answer by Charlie (2017-12-23 16:26:49) |

Under Magic circle revisited (in Numbers) Posted on 2017-12-22 (5 Comments) |

| Computer exploration and OEIS identification. by Charlie (2017-12-22 13:04:22) |

Under One problem - many ways to solve... (in Numbers) Posted on 2017-12-21 (6 Comments) |

| My ways by Charlie (2017-12-21 11:31:11) |

Under A true story (in Numbers) Posted on 2017-12-20 (6 Comments) |

| a start by Charlie (2017-12-20 16:30:13) |

Under East Pole, West Pole. (in General) Posted on 2017-12-19 (1 Comments) |

| My thoughts on the subject by Charlie (2017-12-19 10:31:31) |

Under Given one, get the other three (in Numbers) Posted on 2017-12-18 (2 Comments) |

| solution by Charlie (2017-12-18 14:09:02) |

Under Fibo's zeroes repeated (in Numbers) Posted on 2017-12-14 (1 Comments) |

| computer-aided solution by Charlie (2017-12-14 11:04:56) |

Under 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) |

| GSP exploration by Charlie (2017-12-13 12:12:07) |

Under 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) |

| Computer results by Charlie (2017-12-12 11:01:33) |

Under Enigma (in Logic) Posted on 2017-12-11 (2 Comments) |

| re: Just kidding (spoiler) by Charlie (2017-12-11 11:06:33) |

Under Verify and prove (in Sequences) Posted on 2017-12-10 (5 Comments) |

| re: computer verification no proof ... or, come to think about it ... by Charlie (2017-12-10 10:32:30) |

| computer verification no proof by Charlie (2017-12-10 10:26:50) |

Under All, except two (in Sequences) Posted on 2017-12-09 (4 Comments) |

| re: ERRATIC SOLUTION (spoiler) by Charlie (2017-12-09 17:43:57) |

Under Spelling bee results (in Just Math) Posted on 2017-12-08 (1 Comments) |

| computer solution with most of the bonuses by Charlie (2017-12-08 15:24:50) |

Under Three fours (in Numbers) Posted on 2017-12-06 (3 Comments) |

| re(2): computer solutions (spoilers) by Charlie (2017-12-07 09:05:40) |

| computer solutions (spoilers) by Charlie (2017-12-06 19:34:47) |

Under Just name the date (in General) Posted on 2017-12-05 (2 Comments) |

| solution by Charlie (2017-12-05 10:03:01) |

Under 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) |

| 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) |

| computer solution to the puzzle as is by Charlie (2017-12-03 11:30:08) |

Under One ninth of a pandigital (in Numbers) Posted on 2017-12-02 (1 Comments) |

| computer solution by Charlie (2017-12-02 14:44:27) |

Under A square pairing (in Numbers) Posted on 2017-11-29 (1 Comments) |

| computer solution by Charlie (2017-11-29 13:31:55) |

Under 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 (spoiler) by Charlie (2017-11-28 09:53:21) |

Under Quickie XI (in Numbers) Posted on 2017-11-27 (2 Comments) |

| solution by Charlie (2017-11-27 13:06:02) |

Under A special pandigital (in Numbers) Posted on 2017-11-26 (1 Comments) |

| computer solution by Charlie (2017-11-26 16:30:12) |

Under Unique decimal primes (in Algorithms) Posted on 2017-11-24 (1 Comments) |

| computer exploration by Charlie (2017-11-24 14:22:49) |

Under A pandigital sum (in Numbers) Posted on 2017-11-21 (1 Comments) |

| computer solution (spoiler) by Charlie (2017-11-21 10:32:45) |

Under What is .... ...... (in Numbers) Posted on 2017-11-19 (1 Comments) |

| computer solution by Charlie (2017-12-02 14:55:23) |

Under Ulam numbers II (in Numbers) Posted on 2017-11-18 (1 Comments) |

| computer "solution" by Charlie (2017-11-18 16:10:30) |

Under 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) |

| computer solution after fixing bug by Charlie (2017-11-19 08:44:36) |

| Either .... by Charlie (2017-11-17 14:26:43) |

Under Where Did You Start? (in Just Math) Posted on 2017-11-16 (3 Comments) |

| tried analytic but had to resort to program (spoiler) by Charlie (2017-11-16 15:19:18) |

Under Your creativity challenged (in Riddles) Posted on 2017-11-15 (5 Comments) |

| I'm not sure why that posted twice by Charlie (2017-11-15 10:15:28) |

| two ideas by Charlie (2017-11-15 10:13:32) |

| two ideas by Charlie (2017-11-15 10:13:32) |

Under Fun primes (in Numbers) Posted on 2017-11-14 (2 Comments) |

| computer solution by Charlie (2017-11-14 14:08:09) |

Under 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) |

Under Beast number as a substring (in Numbers) Posted on 2017-11-11 (2 Comments) |

| computer investigation including a solution by Charlie (2017-11-11 12:02:15) |

Under Talking BIG (in Numbers) Posted on 2017-11-10 (3 Comments) |

| solution by Charlie (2017-11-10 11:02:25) |

Under Reverse Engineering I (in Cryptography) Posted on 2017-11-09 (2 Comments) |

| answer by Charlie (2017-11-09 13:25:23) |

Under One digit answer (in Numbers) Posted on 2017-11-08 (3 Comments) |

| re: Solution by Charlie (2017-11-08 15:49:59) |

Under Attributed to Lewis Carroll (in Probability) Posted on 2017-11-07 (4 Comments) |

| 2 scenarios: with and without replacement by Charlie (2017-11-07 14:19:37) |

Under Rectangle in a circle (in Just Math) Posted on 2017-11-07 (3 Comments) |

| GSP and calculus solution by Charlie (2017-11-07 10:07:58) |

Under No big digits involved (in Numbers) Posted on 2017-11-06 (2 Comments) |

| solution by Charlie (2017-11-06 18:04:58) |

Under Searching for the minimal repunit (in Numbers) Posted on 2017-11-06 (1 Comments) |

| computer solution by Charlie (2017-11-06 12:38:05) |

Under Square triplets (in Just Math) Posted on 2017-11-05 (2 Comments) |

| computer solution by Charlie (2017-11-05 14:14:00) |

Under Truth or consequences (in Just Math) Posted on 2017-11-02 (2 Comments) |

| solution by Charlie (2017-11-02 17:51:44) |

Under Counting appearances (in Numbers) Posted on 2017-11-01 (1 Comments) |

| solution by Charlie (2017-11-01 16:09:16) |

Under Mutual dependence (in Numbers) Posted on 2017-11-01 (3 Comments) |

| answer by Charlie (2017-11-01 10:55:23) |

Under 2 ways to prove it (in Just Math) Posted on 2017-10-31 (2 Comments) |

| my offered proofs... are they really the same by Charlie (2017-10-31 13:58:26) |

Under 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 by Charlie (2017-10-31 10:23:52) |

Under Letters in a Box (in Logic) Posted on 2017-10-30 (2 Comments) |

| My apologies re: official solution by Charlie (2017-11-16 18:47:36) |

Under A common feature (in Numbers) Posted on 2017-10-29 (1 Comments) |

| researched solution by Charlie (2017-10-29 11:35:41) |

Under 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) |

| computer solution by Charlie (2017-10-28 11:17:31) |

Under Leaving the least (the most) (in Numbers) Posted on 2017-10-27 (2 Comments) |

| computer solutions by Charlie (2017-10-27 10:40:23) |

Under It is not SIX (in Numbers) Posted on 2017-10-26 (4 Comments) |

| computer solution (spoiler) by Charlie (2017-10-26 10:42:39) |

Under Obtuse angle? (in Probability) Posted on 2017-10-25 (2 Comments) |

| solutions by Charlie (2017-10-25 15:02:17) |

Under 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) |

Under 3 multiples of cubes (in Numbers) Posted on 2017-10-24 (1 Comments) |

| computer solution by Charlie (2017-10-24 11:06:36) |

Under Urban architecture (in Word Problems) Posted on 2017-10-23 (1 Comments) |

| computer findings by Charlie (2017-10-23 15:52:28) |

Under 31 or more (in Games) Posted on 2017-10-21 (5 Comments) |

| re: computer aided solution by Charlie (2017-10-21 17:16:49) |

| computer aided solution by Charlie (2017-10-21 16:59:55) |

Under 3 lowest score words (in Word Problems) Posted on 2017-10-20 (3 Comments) |

| computer solution by Charlie (2017-10-20 16:14:49) |

Under 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) |

| computer solution by Charlie (2017-10-20 11:04:42) |

Under 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) |

| My take on it by Charlie (2017-10-19 13:43:53) |

Under âˆš22 (in Numbers) Posted on 2017-10-18 (3 Comments) |

| short general proof by Charlie (2017-10-18 15:28:53) |

Under SUM = PR0DUCT (in Numbers) Posted on 2017-10-18 (3 Comments) |

| computer solution by Charlie (2017-10-18 10:52:00) |

Under Alfey revava ... (in General) Posted on 2017-10-17 (3 Comments) |

| re: computer solution by Charlie (2017-10-17 16:25:34) |

| computer solution by Charlie (2017-10-17 16:16:32) |

Under 9 cubes (in Numbers) Posted on 2017-10-17 (1 Comments) |

| computer solution by Charlie (2017-10-17 12:51:10) |

Under 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) |

Under 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) |

| computer-aided solution by Charlie (2017-10-15 16:54:45) |

Under What's out? (in Word Problems) Posted on 2017-10-13 (3 Comments) |

| re: anagrammatic spoilers by Charlie (2017-10-13 10:27:05) |

Under Equal Power Sum Sets (in Numbers) Posted on 2017-10-11 (1 Comments) |

| computer solution by Charlie (2017-10-11 15:13:30) |

Under Somewhere in the USA (in Word Problems) Posted on 2017-10-10 (6 Comments) |

| Computer search finds other geographic entities by Charlie (2017-10-10 13:35:40) |

Under Does it continue? 10: Alternate differences (in Numbers) Posted on 2017-10-07 (2 Comments) |

| computer exploration by Charlie (2017-10-07 22:22:53) |

Under Squeeze in (in Word Problems) Posted on 2017-10-05 (4 Comments) |

| computer aided solution by Charlie (2017-10-05 14:43:54) |

Under In Europe (in General) Posted on 2017-10-04 (6 Comments) |

| re(2): the equation part by Charlie (2017-10-04 13:35:08) |

| the equation part by Charlie (2017-10-04 10:26:43) |

Under A set of ages (in Just Math) Posted on 2017-10-02 (1 Comments) |

| computer aided solution by Charlie (2017-10-02 11:07:08) |

Under Oddly even numbers (in Numbers) Posted on 2017-10-01 (1 Comments) |

| computer solution by Charlie (2017-10-01 15:48:18) |

Under Does it continue? 8: Prime together (in Numbers) Posted on 2017-09-30 (1 Comments) |

| computer solution by Charlie (2017-09-30 15:52:22) |

Under A scrambled BEDLAM (in Just Math) Posted on 2017-09-29 (2 Comments) |

| with computer assistance by Charlie (2017-09-29 10:42:53) |

Under Does it continue? 7: Partial sums again (in Numbers) Posted on 2017-09-28 (1 Comments) |

| computer exploration by Charlie (2017-09-28 15:15:27) |

Under Toasting the eternal (in Just Math) Posted on 2017-09-27 (1 Comments) |

| computer solution (spoilers) by Charlie (2017-09-27 11:49:50) |

Under Does it continue? 6: Partial sums (in Numbers) Posted on 2017-09-25 (7 Comments) |

| answers by Charlie (2017-09-25 12:32:44) |

Under Does it continue? 5: powers of 2 (in Numbers) Posted on 2017-09-24 (6 Comments) |

| computer findings by Charlie (2017-09-24 16:53:43) |

Under 3 by 3 by 5 (in Word Problems) Posted on 2017-09-22 (6 Comments) |

| computer finds few words, apparently not all compatible by Charlie (2017-09-22 12:17:16) |

| only two words found -- no computer program used by Charlie (2017-09-22 10:38:15) |

Under Does it continue? 4: Euclid's next prime (in Numbers) Posted on 2017-09-21 (3 Comments) |

| Initial thought and computer exploration by Charlie (2017-09-21 13:05:22) |

Under Does it continue? 3: Growing table of primes (in Numbers) Posted on 2017-09-19 (3 Comments) |

| first thought and computer vindication by Charlie (2017-09-19 10:54:29) |

Under Reverse Engineering (in General) Posted on 2017-09-15 (3 Comments) |

| researched answer by Charlie (2017-09-15 10:45:16) |

Under 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) |

Under MMMMMM Donut (in Just Math) Posted on 2017-09-11 (4 Comments) |

| solution by Charlie (2017-09-11 12:16:35) |

Under 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) |

| when it works -- computer exploration by Charlie (2017-09-07 10:53:24) |

Under Who began with 50 cents? (in Just Math) Posted on 2017-09-06 (3 Comments) |

| solution by Charlie (2017-09-06 13:13:58) |

Under 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) |

| A little less obvious, for part c by Charlie (2017-09-04 10:36:41) |

Under Two sums of digits (in Just Math) Posted on 2017-09-02 (5 Comments) |

| computer solution (spoilers) by Charlie (2017-09-02 12:54:29) |

Under Tea-time cakes (in Just Math) Posted on 2017-09-01 (2 Comments) |

| of course there's the computer way by Charlie (2017-09-01 13:53:37) |

Under Are we there yet? (in Probability) Posted on 2017-08-30 (5 Comments) |

| re: Part 3 by Charlie (2017-08-31 15:40:15) |

| parts 1 & 2 only; outline of 3 by Charlie (2017-08-30 12:28:14) |

Under Triangle in a triangle (in Shapes) Posted on 2017-08-28 (4 Comments) |

| answer by Charlie (2017-08-28 12:17:22) |

Under Strobogrammatic to pandigital (in Numbers) Posted on 2017-08-26 (4 Comments) |

| computer solution by Charlie (2017-08-26 16:31:15) |

Under Leaving a maximal result (in Algorithms) Posted on 2017-08-25 (1 Comments) |

| algorithm by Charlie (2017-08-25 10:47:40) |

Under 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) |

Under The trio (in Liars and Knights) Posted on 2017-08-21 (1 Comments) |

| solution by Charlie (2017-08-21 12:23:07) |

Under A repunit product (in Word Problems) Posted on 2017-08-19 (4 Comments) |

| solution by Charlie (2017-08-19 22:04:28) |

Under Marbles in boxes (in Algorithms) Posted on 2017-08-16 (5 Comments) |

| solution by Charlie (2017-08-16 11:41:37) |

Under 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) |

| proof (but not a proof that this is the lowest achievable) by Charlie (2017-08-12 11:42:49) |

Under Bob and Alice make a poor choice (in Numbers) Posted on 2017-08-11 (7 Comments) |

| re(2): solution (spoiler) - precision check by Charlie (2017-08-11 14:29:42) |

| solution (spoiler) by Charlie (2017-08-11 12:33:55) |

Under Straight or rotated (in Numbers) Posted on 2017-08-10 (3 Comments) |

| program and solution (spoilers) by Charlie (2017-08-10 11:16:22) |

Under Even (related) chances (in Probability) Posted on 2017-08-09 (4 Comments) |

| solution (spoiler) by Charlie (2017-08-09 11:34:37) |

Under Palindromic sum (in Just Math) Posted on 2017-08-08 (3 Comments) |

| The "grunt work" left to the computer (spoiler) by Charlie (2017-08-08 10:13:42) |

Under A text sans (in Word Problems) Posted on 2017-08-07 (1 Comments) |

| He who hesitates is lost by Charlie (2017-08-07 12:33:13) |

Under 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) |

Under Published in the thirties (in Famous Riddles) Posted on 2017-08-03 (3 Comments) |

| An Isle of Joy (this is not Kansas any more) (spoiler) by Charlie (2017-08-04 10:18:07) |

Under Think big (in Numbers) Posted on 2017-08-03 (2 Comments) |

| Actually it could be done with VB by Charlie (2017-08-03 11:08:15) |

| Think Big ... Think UBASIC (spoilers) by Charlie (2017-08-03 10:31:36) |

Under Dec = xeh (in Numbers) Posted on 2017-08-02 (5 Comments) |

| computer solutions. Don't know the commonality. by Charlie (2017-08-02 14:16:35) |

Under Two parallelograms (in Geometry) Posted on 2017-08-01 (3 Comments) |

| GSP by Charlie (2017-08-01 10:11:30) |

Under Find this word (in Word Problems) Posted on 2017-07-31 (7 Comments) |

| Funny... (spoilers) by Charlie (2017-07-31 10:27:48) |

Under Add'em all ! (in Numbers) Posted on 2017-07-27 (3 Comments) |

| computer solution (spoiler) by Charlie (2017-07-27 10:30:14) |

Under Pandigitals Divided by 11 (in Numbers) Posted on 2017-07-23 (4 Comments) |

| computer exploration by Charlie (2017-07-23 10:39:48) |

Under Almost-pandigital sets (in Numbers) Posted on 2017-07-22 (1 Comments) |

| computer solution by Charlie (2017-07-22 11:32:40) |

Under 2 bases (in Numbers) Posted on 2017-07-21 (2 Comments) |

| computer solution (spoiler) by Charlie (2017-07-21 10:47:40) |

Under 3 and 4-digit numbers (in Numbers) Posted on 2017-07-17 (6 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) |

Under 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) |

Under Unpainting Black (in Probability) Posted on 2017-07-14 (5 Comments) |

| Details of the results by Charlie (2017-07-15 11:29:16) |

| corrected program with revised answer by Charlie (2017-07-14 22:20:16) |

| proposed computer solution by Charlie (2017-07-14 17:05:24) |

| re: Preliminary work & thoughts by Charlie (2017-07-14 10:13:03) |

Under Make the proof full-proof (in Word Problems) Posted on 2017-07-11 (1 Comments) |

| first the computer,then a human correction by Charlie (2017-07-11 10:48:27) |

Under Pythagorean H/L ratios (in Just Math) Posted on 2017-07-08 (2 Comments) |

| computer solution by Charlie (2017-07-08 11:49:48) |

Under Commutative Exponentiation (in Just Math) Posted on 2017-07-07 (7 Comments) |

| exploration by Charlie (2017-07-07 14:22:36) |

Under Just add 2 letters (in Word Problems) Posted on 2017-07-06 (2 Comments) |

| computer findings (spoilers) by Charlie (2017-07-06 09:53:55) |

Under 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) |

| No Subject by Charlie (2017-07-04 13:37:01) |

Under Larger area / larger perimeter (in Numbers) Posted on 2017-07-03 (3 Comments) |

| computer solution by Charlie (2017-07-03 14:24:05) |

Under 38s and Bunches of 1s (in Numbers) Posted on 2017-06-30 (7 Comments) |

| re(2): No proof but a pattern found by Charlie (2017-06-30 10:14:56) |

| No proof but a pattern found by Charlie (2017-06-30 09:04:10) |

Under Square Egyptians (in Numbers) Posted on 2017-06-28 (1 Comments) |

| computer solution by Charlie (2017-06-28 13:59:04) |

Under Words and hints (in General) Posted on 2017-06-27 (1 Comments) |

| computer aided solution by Charlie (2017-06-27 12:23:17) |

Under 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) |

| computer results (spoilers) by Charlie (2017-06-23 18:11:50) |

Under Letters to digits to letters (in Numbers) Posted on 2017-06-22 (1 Comments) |

| computer solution by Charlie (2017-06-22 10:34:01) |

Under 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) |

| Programming exercise (spoiler); 20/20 hindsight by Charlie (2017-06-21 16:02:27) |

Under Make It Even Again (in Probability) Posted on 2017-06-20 (4 Comments) |

| computer findings by Charlie (2017-06-20 15:18:19) |

Under Punchline I (in Word Problems) Posted on 2017-06-19 (3 Comments) |

| Part 2: Of course it was... by Charlie (2017-06-19 14:37:35) |

Under Love story (in General) Posted on 2017-06-17 (1 Comments) |

| computer solution by Charlie (2017-06-17 18:49:13) |

Under Candy lover (in Liars and Knights) Posted on 2017-06-12 (3 Comments) |

| solution by Charlie (2017-06-12 13:56:57) |

Under A madness sequence (50 digits) (in Sequences) Posted on 2017-06-11 (1 Comments) |

| solution by Charlie (2017-06-11 15:58:14) |

Under 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 by Charlie (2017-06-10 10:52:26) |

Under A powerful anagram (in Word Problems) Posted on 2017-06-09 (2 Comments) |

| annotated computer listing by Charlie (2017-06-09 18:24:36) |

Under 18 is not enough (in Sequences) Posted on 2017-06-06 (2 Comments) |

| solution by Charlie (2017-06-06 11:22:53) |

Under Red vs Black Cuts (in Numbers) Posted on 2017-06-05 (8 Comments) |

| solution by Charlie (2017-06-05 10:43:06) |

Under 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) |

| The proof and the bonus by Charlie (2017-06-03 14:31:38) |

Under 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) |

| computer discovery by Charlie (2017-05-31 16:20:20) |

Under N dice (in Probability) Posted on 2017-05-25 (3 Comments) |

| computer aided solution by Charlie (2017-05-25 12:14:14) |

Under Higher Powers of Eleven (in Numbers) Posted on 2017-05-24 (4 Comments) |

| re: Analytic Solution by Charlie (2017-05-26 15:45:40) |

| computer solution by Charlie (2017-05-24 11:32:24) |

Under Four balls (in Probability) Posted on 2017-05-19 (22 Comments) |

| re(4): Who's right by Charlie (2017-05-21 22:13:24) |

| 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 by Charlie (2017-05-19 11:00:34) |

Under Hands off! (in Weights and Scales) Posted on 2017-05-16 (3 Comments) |

| Two ways of looking at it both agree by Charlie (2017-05-16 10:36:39) |

Under 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 computer results by Charlie (2017-05-11 14:08:31) |

Under One more line (in Logic) Posted on 2017-05-10 (4 Comments) |

| trivial solution? -- or is this not the solution? by Charlie (2017-05-10 10:32:24) |

Under The length of the belt (in Geometry) Posted on 2017-05-09 (5 Comments) |

| solution by Charlie (2017-05-09 09:35:50) |

Under No software allowed ! (in Numbers) Posted on 2017-05-07 (6 Comments) |

| re(2): Solution by Charlie (2017-05-07 16:26:51) |

Under All ten (in Numbers) Posted on 2017-05-06 (1 Comments) |

| computer solution by Charlie (2017-05-06 13:35:05) |

Under Sum and Difference II (in Numbers) Posted on 2017-05-05 (1 Comments) |

| computer solution by Charlie (2017-05-05 13:47:42) |

Under Pandigital + (in Probability) Posted on 2017-05-03 (3 Comments) |

| Analytic solution with Computer calculations by Charlie (2017-05-03 14:19:51) |

Under The smallest non-conformist (in Numbers) Posted on 2017-05-02 (3 Comments) |

| with computer assistance by Charlie (2017-05-02 12:47:47) |

Under A cent or more? (in Probability) Posted on 2017-05-01 (2 Comments) |

| conditional nature of the problem (spoilers) by Charlie (2017-05-01 08:56:54) |

Under Smallest pandifibo number (in Numbers) Posted on 2017-04-29 (1 Comments) |

| UBASIC solution by Charlie (2017-04-29 13:57:59) |

Under 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 via computer by Charlie (2017-04-25 09:18:01) |

Under 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) |

Under 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) |

| Computer findings -- probably wrong, based on previous posts by Charlie (2017-04-19 14:09:46) |

Under A factorial in seconds (in Numbers) Posted on 2017-04-18 (6 Comments) |

| solution in under 200 seconds with calculator by Charlie (2017-04-18 09:21:01) |

Under Polygon Overlap (in Geometry) Posted on 2017-04-17 (1 Comments) |

| solution by Charlie (2017-04-17 10:49:34) |

Under Pandigital and square (in Numbers) Posted on 2017-04-15 (6 Comments) |

| computer solution by Charlie (2017-04-15 14:22:31) |

Under Growth Potential (in Algorithms) Posted on 2017-04-13 (4 Comments) |

| Two proposed proofs by Charlie (2017-04-13 10:03:35) |

Under Names in Boxes (in Logic) Posted on 2017-04-09 (10 Comments) |

| re(3): Loops by Charlie (2017-04-12 14:41:51) |

| re: Loops by Charlie (2017-04-12 10:54:02) |

Under Excellent numbers (in Numbers) Posted on 2017-04-08 (3 Comments) |

| computer solution: 6-, 8- and 10-digits by Charlie (2017-04-08 12:17:11) |

Under The magnificent twelve (in Numbers) Posted on 2017-04-07 (2 Comments) |

| computer solution (spoiler) -- with a caveat on the restrictions by Charlie (2017-04-07 12:26:51) |

Under Three mirrored multiplications (in Numbers) Posted on 2017-04-02 (1 Comments) |

| computer solution by Charlie (2017-04-02 12:40:21) |

Under Prime power puzzle (in Just Math) Posted on 2017-04-01 (8 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) |

Under 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) |

| A different answer by Charlie (2017-03-27 10:37:55) |

Under 1 is one of them (in Numbers) Posted on 2017-03-25 (2 Comments) |

| computer solution by Charlie (2017-03-25 14:51:18) |

Under True for nine and up (in Numbers) Posted on 2017-03-24 (3 Comments) |

| With some computer aid by Charlie (2017-03-24 11:00:45) |

Under Elongated Pentagonal Orthocupola's vertices (in Shapes) Posted on 2017-03-20 (3 Comments) |

| re: solution by Charlie (2017-03-20 12:31:07) |

Under 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 by Charlie (2017-03-19 13:32:00) |

Under A rare palindrome (in Numbers) Posted on 2017-03-18 (1 Comments) |

| computer solution by Charlie (2017-03-18 13:48:46) |

Under Primes and factors (in Numbers) Posted on 2017-03-17 (2 Comments) |

| computer solution carried beyond by Charlie (2017-03-17 10:23:55) |

Under Same side story (in Probability) Posted on 2017-03-16 (5 Comments) |

| re: Corrected solution by Charlie (2017-03-29 10:46:12) |

Under 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) |

Under Facing each other (in Just Math) Posted on 2017-03-07 (2 Comments) |

| solution (spoiler) by Charlie (2017-03-07 09:39:18) |

Under Only real x counted (in Probability) Posted on 2017-03-01 (3 Comments) |

| solution (spoiler) by Charlie (2017-03-01 10:52:32) |

Under a KISS puzzle (in Just Math) Posted on 2017-02-27 (2 Comments) |

| solution by Charlie (2017-02-27 10:10:00) |

Under Areas ratio (in Probability) Posted on 2017-02-24 (1 Comments) |

| solution by Charlie (2017-02-24 11:18:28) |

Under Odds are ... (in Probability) Posted on 2017-02-14 (8 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) |

Under 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 computer results by Charlie (2017-02-10 23:27:17) |

Under Lies, truth, and logic (in Liars and Knights) Posted on 2017-02-09 (2 Comments) |

| Lots of solutions even between 20 and 40 by Charlie (2017-02-09 21:31:10) |

Under A better approximate Pythagorean Theorem (in Calculus) Posted on 2017-02-08 (1 Comments) |

| heuristic estimate based on computer program by Charlie (2017-02-08 10:51:42) |

Under Forward and Backward Word Values (in General) Posted on 2017-02-07 (5 Comments) |

| I don't know what truncated my previous list, but by Charlie (2017-02-08 08:28:57) |

| computer solution (spoiler) by Charlie (2017-02-07 12:51:37) |

Under Given VI, evaluate VII (in Sequences) Posted on 2017-02-01 (1 Comments) |

| computer solution (spoiler) by Charlie (2017-02-01 10:55:25) |

Under Multiples with 3 (in Numbers) Posted on 2017-01-31 (3 Comments) |

| computer solution, taken beyond by Charlie (2017-01-31 12:59:29) |

Under Opening your eyes (in Famous Riddles) Posted on 2017-01-28 (2 Comments) |

| A Google search on the wording by Charlie (2017-01-29 12:49:59) |

Under A false conjecture (in Numbers) Posted on 2017-01-27 (7 Comments) |

| re: computer attempt by Charlie (2017-01-27 14:24:25) |

| computer attempt by Charlie (2017-01-27 12:37:47) |

Under 1,3,8 ...extend! (in Numbers) Posted on 2017-01-26 (4 Comments) |

| computer finding by Charlie (2017-01-26 14:38:53) |

Under Ain't she clever? (in Just Math) Posted on 2017-01-24 (1 Comments) |

| solution given certain assumptions by Charlie (2017-01-24 11:15:52) |

Under Topical Quotation V (in Word Problems) Posted on 2017-01-18 (1 Comments) |

| Hint by Charlie (2017-01-19 22:30:20) |

Under An interesting recurrence (in Numbers) Posted on 2017-01-17 (5 Comments) |

| computer solution by Charlie (2017-01-17 11:20:42) |

Under Age Progression (in Numbers) Posted on 2017-01-16 (3 Comments) |

| the cases -- to age 100 by Charlie (2017-01-16 16:01:35) |

Under 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 by Charlie (2017-01-12 14:48:35) |

Under (xâˆ’y)^ n = xy (in Just Math) Posted on 2017-01-07 (2 Comments) |

| computer exploration by Charlie (2017-01-07 14:46:42) |

Under From Tangent to Circle (in Geometry) Posted on 2017-01-04 (4 Comments) |

| solution for part 2; outline for part 1 by Charlie (2017-01-04 13:38:09) |

Under Counting brackets (in Just Math) Posted on 2017-01-03 (1 Comments) |

| computer exploration and solution by Charlie (2017-01-03 15:22:32) |

Under Which is the biggest? (in Numbers) Posted on 2017-01-02 (2 Comments) |

| solution by Charlie (2017-01-02 10:43:01) |

Under Congruent Incircles (in Geometry) Posted on 2017-01-01 (6 Comments) |

| numerical computer solution by Charlie (2017-01-01 12:43:06) |

Under Skill or food? (in Numbers) Posted on 2016-12-28 (5 Comments) |

| re(3): Crazy for coconuts extra hint by Charlie (2016-12-29 10:39:38) |

| software solution by Charlie (2016-12-28 11:29:28) |

Under Who discovered the secret? (in Logic) Posted on 2016-12-27 (4 Comments) |

| solution by Charlie (2016-12-27 09:45:00) |

Under Nothing's perfect. (in Sequences) Posted on 2016-12-24 (1 Comments) |

| computer exploration by Charlie (2016-12-26 08:56:34) |

Under A chain of powers (in Sequences) Posted on 2016-12-22 (1 Comments) |

| computer observations by Charlie (2016-12-22 09:37:15) |

Under Prime candidates (in Just Math) Posted on 2016-12-20 (5 Comments) |

| computer exploration by Charlie (2016-12-20 13:34:08) |

Under Legally Blonde (in Liars and Knights) Posted on 2016-12-19 (8 Comments) |

| another way by Charlie (2016-12-19 10:31:34) |

Under Traveling with Luggage (in Logic) Posted on 2016-12-15 (2 Comments) |

| computer solution (spoiler) by Charlie (2016-12-15 10:38:16) |

Under Decimal and Binary Representation (in Numbers) Posted on 2016-12-13 (3 Comments) |

| 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) |

| hint based somewhat on computer findings by Charlie (2016-12-13 10:31:41) |

Under Pentagon Partitions (in Shapes) Posted on 2016-12-11 (3 Comments) |

| re: A solution (spoiler) by Charlie (2016-12-12 11:19:42) |

Under Gluing Cubes (in Shapes) Posted on 2016-12-08 (1 Comments) |

| proposed solution by Charlie (2016-12-08 10:28:20) |

Under 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) |

Under Moving Two Rooks (in Games) Posted on 2016-12-06 (2 Comments) |

| re: For the Win (spoiler) by Charlie (2016-12-06 15:37:11) |

Under Four integers (in Numbers) Posted on 2016-12-04 (8 Comments) |

| extending the limit to 1700 (spoiler) by Charlie (2016-12-04 11:05:42) |

| computer solution (spoiler) by Charlie (2016-12-04 11:01:08) |

Under A biased random walk (in Probability) Posted on 2016-12-01 (1 Comments) |

| computer exploration by Charlie (2016-12-01 09:21:44) |

Under 7+8=12 ?? (in Just Math) Posted on 2016-11-30 (3 Comments) |

| computer solution (spoiler) by Charlie (2016-11-30 10:29:30) |

Under composite function (in Calculus) Posted on 2016-11-29 (2 Comments) |

| by graphing by Charlie (2016-11-29 13:59:19) |

Under 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) |

Under Prime repunits (in Numbers) Posted on 2016-11-24 (5 Comments) |

| computer exploration by Charlie (2016-11-24 17:59:10) |

Under 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) |

| the computer says by Charlie (2016-11-23 20:14:31) |

| re(2): How many...... g o o f by Charlie (2016-11-22 22:17:10) |

| How many by Charlie (2016-11-22 11:23:45) |

Under At least twice (in Numbers) Posted on 2016-11-17 (5 Comments) |

| 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) |

| a start by Charlie (2016-11-17 09:31:01) |

Under 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) |

| e pluribus duo by Charlie (2016-11-16 10:13:46) |

Under A radical problem (in Just Math) Posted on 2016-11-15 (2 Comments) |

| solution by Charlie (2016-11-15 10:39:36) |

Under Don't be confused (in General) Posted on 2016-11-14 (4 Comments) |

| using a calculator by Charlie (2016-11-14 12:41:24) |

Under Linear*Quadratic = Square (in Just Math) Posted on 2016-11-12 (2 Comments) |

| computer exploration by Charlie (2016-11-12 10:59:45) |

Under 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) |

| re: Hint #2: by Charlie (2016-11-13 13:20:20) |

Under 63 Division Decision (in Just Math) Posted on 2016-11-10 (3 Comments) |

| computer solution by Charlie (2016-11-10 12:42:32) |

Under AABBCC and Perfect Square (in Just Math) Posted on 2016-11-09 (6 Comments) |

| computer solution by Charlie (2016-11-09 13:37:06) |

Under Lucas Digits Look (in Just Math) Posted on 2016-11-07 (10 Comments) |

| re: solution+ by Charlie (2016-11-07 10:59:44) |

| solution+ by Charlie (2016-11-07 10:54:14) |

Under 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) |

| My conclusion by Charlie (2016-11-03 09:22:32) |

Under 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) |

Under Equal Temperatures (in Just Math) Posted on 2016-10-31 (6 Comments) |

| re(2): computer solution by Charlie (2016-10-31 19:19:55) |

| re: No Subject by Charlie (2016-10-31 11:54:31) |

| computer solution by Charlie (2016-10-31 11:53:55) |

Under Reciprocal Period Poser (in Just Math) Posted on 2016-10-29 (2 Comments) |

| computer solution by Charlie (2016-10-29 10:49:24) |

Under Symmetry helps! (in Just Math) Posted on 2016-10-26 (7 Comments) |

| computer exploration by Charlie (2016-10-26 12:08:23) |

Under Figuring Forty-Nine and Sequence (in Sequences) Posted on 2016-10-25 (2 Comments) |

| No proof, but ... by Charlie (2016-10-25 09:18:28) |

Under Totient Trial (in Just Math) Posted on 2016-10-24 (2 Comments) |

| computer solution by Charlie (2016-10-24 19:16:26) |

Under Prime and Twice Square (in Just Math) Posted on 2016-10-22 (4 Comments) |

| re: A solution by Charlie (2016-10-22 15:54:41) |

Under 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) |

| computer solution by Charlie (2016-10-21 14:46:29) |

Under 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 for puzzle as originally given by Charlie (2016-10-20 15:13:11) |

Under 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) |

| Two ways. by Charlie (2016-10-19 08:55:46) |

Under Positively Positive (in Just Math) Posted on 2016-10-18 (7 Comments) |

| findings by Charlie (2016-10-18 16:18:25) |

Under Mismatch Muse (in Logic) Posted on 2016-10-18 (1 Comments) |

| proposed solution by Charlie (2016-10-18 10:58:05) |

Under Prime and Six Settlement (in Just Math) Posted on 2016-10-17 (4 Comments) |

| solution by Charlie (2016-10-17 10:51:13) |

Under get the real part of the problem (in Just Math) Posted on 2016-10-16 (1 Comments) |

| solution by Charlie (2016-10-16 11:13:54) |

Under this is the range of my root (in Just Math) Posted on 2016-10-14 (1 Comments) |

| analysis then computation by Charlie (2016-10-14 15:41:10) |

Under Phibobrick's dimensions (in Numbers) Posted on 2016-10-14 (1 Comments) |

| proposed solution by Charlie (2016-10-14 11:45:47) |

Under River Cross Resolution (in Weights and Scales) Posted on 2016-10-12 (1 Comments) |

| computer solution by Charlie (2016-10-12 12:21:50) |

Under Adding consecutive primes (in Just Math) Posted on 2016-10-11 (1 Comments) |

| computer solution by Charlie (2016-10-11 13:45:47) |

Under Four Digit Arithmetic (in Just Math) Posted on 2016-10-11 (2 Comments) |

| computer solution by Charlie (2016-10-11 09:52:41) |

Under Bridge Cross Baffle (in Logic) Posted on 2016-10-10 (3 Comments) |

| Wouldda, Coudda, Shouldda done it by computer by Charlie (2016-10-10 15:45:39) |

| proposed solution by Charlie (2016-10-10 12:17:24) |

Under polynomial problem 3 (in Just Math) Posted on 2016-10-08 (2 Comments) |

| D4? (spoiler) by Charlie (2016-10-08 09:32:36) |

Under 2 sums modulo 7 (in Probability) Posted on 2016-10-05 (3 Comments) |

| 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 computed values by Charlie (2016-10-05 14:43:35) |

Under Additional solutions, please (in Just Math) Posted on 2016-10-03 (3 Comments) |

| re(2): computer solution -- final part by Charlie (2016-10-03 18:10:37) |

| re: computer solution -- continued by Charlie (2016-10-03 18:09:13) |

| computer solution by Charlie (2016-10-03 18:07:32) |

Under Unit Cube Paint Undertaking (in Shapes) Posted on 2016-09-28 (6 Comments) |

| Considering all the possibilities by Charlie (2016-09-28 15:29:47) |

| re: Interesting. by Charlie (2016-09-28 12:23:22) |

Under 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) |

Under Numbers' quantifiers (in Logic) Posted on 2016-09-23 (4 Comments) |

| re(2): a try by Charlie (2016-09-23 21:43:17) |

| a try by Charlie (2016-09-23 15:48:50) |

Under Nonnegative Sum Nuance (in Probability) Posted on 2016-09-23 (1 Comments) |

| solution by Charlie (2016-09-23 10:44:58) |

Under A cyclic path (in Geometry) Posted on 2016-09-21 (1 Comments) |

| first guess by Charlie (2016-09-21 12:43:29) |

Under 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) |

Under Real roots from three dice (in Probability) Posted on 2016-09-20 (1 Comments) |

| computer-aided solution by Charlie (2016-09-20 15:43:45) |

Under Unbiased and Biased Choice (in Probability) Posted on 2016-09-19 (1 Comments) |

| solution by Charlie (2016-09-19 10:56:17) |

Under Provide the next number (in Sequences) Posted on 2016-09-18 (2 Comments) |

| that, I guess, was hint enough by Charlie (2016-09-24 13:11:25) |

Under GCD and LCM (in Just Math) Posted on 2016-09-16 (1 Comments) |

| solution by Charlie (2016-09-16 10:18:50) |

Under Ascending Hexadecimal Digits (in Just Math) Posted on 2016-09-15 (1 Comments) |

| solution by Charlie (2016-09-15 10:08:44) |

Under NegaTernary Nuance (in Algorithms) Posted on 2016-09-14 (1 Comments) |

| solution by Charlie (2016-09-14 11:01:03) |

Under Duodecimal Pandigital Divisibility Device (in Algorithms) Posted on 2016-09-13 (2 Comments) |

| Choice of two algorithms by Charlie (2016-09-13 09:51:04) |

Under Think twice (in Just Math) Posted on 2016-09-12 (4 Comments) |

| The apparent solution by Charlie (2016-09-12 10:33:10) |

Under Finding the hidden digit (in Tricks) Posted on 2016-09-09 (1 Comments) |

| solution by Charlie (2016-09-09 10:54:07) |

Under 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) |

| Actual part i simulation by Charlie (2016-09-08 13:11:57) |

| simulation of a simpler case by Charlie (2016-09-08 12:10:15) |

Under Counting ARATs (in Numbers) Posted on 2016-09-07 (4 Comments) |

| 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) |

| programming mistake; also need faster computer/programming language by Charlie (2016-09-07 10:23:17) |

Under Nineteenth Exponent Exposition (in Just Math) Posted on 2016-09-06 (3 Comments) |

| An analytic start and a calculator finish by Charlie (2016-09-06 15:42:04) |

Under 1248 must be included (in Sequences) Posted on 2016-09-06 (3 Comments) |

| Brute force (computer solution) by Charlie (2016-09-06 10:19:42) |

Under Form Finding From Solution (in Just Math) Posted on 2016-09-05 (2 Comments) |

| seems to be a solution by Charlie (2016-09-05 12:35:06) |

Under Getting 189 (in Numbers) Posted on 2016-09-05 (1 Comments) |

| solution by Charlie (2016-09-05 10:05:38) |

Under Tetra Anagram Trial (in Word Problems) Posted on 2016-09-02 (4 Comments) |

| Computer exploration and a guess by Charlie (2016-09-02 09:42:55) |

Under Empty or fool ?? (in Logic) Posted on 2016-09-01 (1 Comments) |

| solution by Charlie (2016-09-01 12:57:44) |

Under Divisibility Property (in Numbers) Posted on 2016-08-31 (2 Comments) |

| With software by Charlie (2016-08-31 11:12:32) |

Under Near Fermat Nuance (in Just Math) Posted on 2016-08-30 (2 Comments) |

| computer solution by Charlie (2016-08-30 15:03:22) |

Under Add missing letters (in Word Problems) Posted on 2016-08-30 (3 Comments) |

| re: answer by Charlie (2016-08-31 07:43:17) |

Under Random Chess Pieces Poser (in Probability) Posted on 2016-08-29 (6 Comments) |

| 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) |

Under Which is greater? (in Just Math) Posted on 2016-08-28 (3 Comments) |

| computer solution (spoiler) by Charlie (2016-08-28 10:29:43) |

Under 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) |

Under Powers of 3 (in Numbers) Posted on 2016-08-25 (5 Comments) |

| Computer exploration by Charlie (2016-08-25 14:11:11) |

Under Labeling Minimum (in Weights and Scales) Posted on 2016-08-25 (4 Comments) |

| re(2): Solution by Charlie (2016-08-25 14:08:39) |

Under 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) |

| simulation by Charlie (2016-08-24 18:30:39) |

Under Business is business (in Word Problems) Posted on 2016-08-24 (6 Comments) |

| re: Hint for previous solvers. by Charlie (2016-08-24 10:53:52) |

| A short couplet by Charlie (2016-08-24 08:32:10) |

Under Murder Muse Resolution (in Riddles) Posted on 2016-08-23 (1 Comments) |

| solution by Charlie (2016-08-23 12:37:08) |

Under Year from Ratio (in General) Posted on 2016-08-22 (3 Comments) |

| re: No Subject by Charlie (2016-08-23 19:52:39) |

Under Estimate a percentage (in Numbers) Posted on 2016-08-22 (6 Comments) |

| potential solution by Charlie (2016-08-22 10:03:49) |

Under Covering a Cube with Strips (in Shapes) Posted on 2016-08-18 (3 Comments) |

| solution by Charlie (2016-08-18 17:03:06) |

Under Guessing your birthdate (in Just Math) Posted on 2016-08-18 (4 Comments) |

| re: part a by Charlie (2016-08-19 22:20:11) |

| part b is easiest with a computer; part a not so much by Charlie (2016-08-18 11:05:32) |

Under Summing up (in Sequences) Posted on 2016-08-17 (2 Comments) |

| solution by Charlie (2016-08-17 14:33:35) |

Under 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) |

| with computer assistance by Charlie (2016-08-16 13:48:36) |

| first thoughts by Charlie (2016-08-16 13:05:33) |

Under 240 divisors (in Just Math) Posted on 2016-08-15 (1 Comments) |

| Analytic guesses plus computer verification (spoiler) by Charlie (2016-08-15 10:27:39) |

Under 1-2-3-4 Square (in Geometry) Posted on 2016-08-12 (3 Comments) |

| solutions by Charlie (2016-08-12 10:38:54) |

Under Form 21 n Times II (in Numbers) Posted on 2016-08-11 (5 Comments) |

| re: Full solution - SPOILER by Charlie (2016-08-11 09:06:28) |

Under Find additional pairs (in Just Math) Posted on 2016-08-08 (5 Comments) |

| re: computer solution by Charlie (2016-08-08 22:19:57) |

| computer solution by Charlie (2016-08-08 22:12:14) |

Under Binomial GCDs (in Just Math) Posted on 2016-08-08 (2 Comments) |

| Heuristic solution by Charlie (2016-08-08 14:34:12) |

Under Visiting Toronto (in Numbers) Posted on 2016-08-05 (1 Comments) |

| computer solution by Charlie (2016-08-10 07:56:26) |

Under Remainder Resolution from Multiple (in Just Math) Posted on 2016-08-04 (5 Comments) |

| computer solution by Charlie (2016-08-04 10:43:25) |

Under Pandigital Multiples of 99 (in Numbers) Posted on 2016-08-03 (2 Comments) |

| solution by Charlie (2016-08-03 14:19:15) |

Under Quadratic and Linear (in Just Math) Posted on 2016-08-03 (2 Comments) |

| computer solution by Charlie (2016-08-03 10:32:48) |

Under Pentagon and Acute Probability (in Probability) Posted on 2016-08-02 (1 Comments) |

| solution by Charlie (2016-08-02 11:54:27) |

Under Staggering Digits (in Just Math) Posted on 2016-07-28 (4 Comments) |

| re: Solution by Charlie (2016-07-28 15:20:11) |

| needed a computer by Charlie (2016-07-28 15:12:04) |

Under 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) |

| computer solution by Charlie (2016-07-27 16:45:07) |

Under A chain of command (in Just Math) Posted on 2016-07-26 (2 Comments) |

| solution if there's no trick by Charlie (2016-07-26 13:35:10) |

Under 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) |

Under Seventh Term Settlement (in Sequences) Posted on 2016-07-22 (10 Comments) |

| re: answer by Charlie (2016-07-22 10:39:59) |

| computer solution by Charlie (2016-07-22 10:34:02) |

Under Cute numbers (in Numbers) Posted on 2016-07-21 (5 Comments) |

| re(2): short review.....augmented by Charlie (2016-07-22 07:45:36) |

| computer solution (spoiler) by Charlie (2016-07-21 10:36:42) |

Under Smallest Multiple of 99 (in Just Math) Posted on 2016-07-19 (3 Comments) |

| Seems to be by Charlie (2016-07-19 14:51:57) |

Under Two items to get sqrt of 2 (in Science) Posted on 2016-07-19 (5 Comments) |

| another way by Charlie (2016-07-19 10:42:59) |

Under The First Repeat (in Probability) Posted on 2016-07-18 (5 Comments) |

| re: answers by Charlie (2016-07-18 15:13:55) |

| solution by Charlie (2016-07-18 15:04:40) |

Under Denver is not the issue (in Word Problems) Posted on 2016-07-18 (5 Comments) |

| re(2): Strong clues from A.A.Euler. (spoiler) by Charlie (2016-07-19 08:01:57) |

| Strong clues from A.A.Euler. by Charlie (2016-07-18 11:33:10) |

Under Cube Count Calculation (in Shapes) Posted on 2016-07-13 (1 Comments) |

| solution by Charlie (2016-07-13 12:55:10) |

Under Two Digit Diameter Trial (in Shapes) Posted on 2016-07-11 (2 Comments) |

| computer solution (spoiler) by Charlie (2016-07-11 15:31:47) |

Under 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) |

| 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) |

| The method for part 2 by Charlie (2016-07-10 14:27:26) |

| re: part one by Charlie (2016-07-10 13:06:36) |

| part one by Charlie (2016-07-10 12:43:17) |

Under Amicable pair generator (in Numbers) Posted on 2016-07-08 (1 Comments) |

| Computer exploration by Charlie (2016-07-08 15:33:47) |

Under 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 by Charlie (2016-07-08 11:17:15) |

Under Two out of seven (in Numbers) Posted on 2016-07-07 (2 Comments) |

| computer solution (spoiler) by Charlie (2016-07-07 15:29:29) |

Under Not too high, not too low (in Just Math) Posted on 2016-07-06 (3 Comments) |

| my solution by Charlie (2016-07-06 14:52:48) |

Under Find Counterexamples (in Numbers) Posted on 2016-07-06 (1 Comments) |

| computer solution to part 1 by Charlie (2016-07-06 10:12:59) |

Under Sequence starting with 30 (in Numbers) Posted on 2016-07-05 (3 Comments) |

| program; research; program by Charlie (2016-07-05 14:43:03) |

Under Quadrilateral Area Query 2 (in Shapes) Posted on 2016-07-03 (3 Comments) |

| another approach by Charlie (2016-07-03 09:40:53) |

Under 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) |

| computer method by Charlie (2016-07-01 10:13:19) |

Under 4 numbers make 5 squares (in Numbers) Posted on 2016-06-30 (10 Comments) |

| 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) |

| computer solution and discussion by Charlie (2016-06-30 11:20:00) |

Under Square Temperatures (in Just Math) Posted on 2016-06-29 (2 Comments) |

| Assuming... by Charlie (2016-06-29 16:27:56) |

Under Simple number trick (in Numbers) Posted on 2016-06-29 (5 Comments) |

| comment by Charlie (2016-06-29 10:13:15) |

Under Pandigital pattern (in Numbers) Posted on 2016-06-28 (2 Comments) |

| Computer exploration by Charlie (2016-06-28 10:16:49) |

Under Skip to 4th power (in Numbers) Posted on 2016-06-27 (4 Comments) |

| convincing but not a proof by Charlie (2016-06-27 19:57:01) |

Under Square Sum in Pairs (in Just Math) Posted on 2016-06-27 (2 Comments) |

| computer solution by Charlie (2016-06-27 13:57:18) |

Under Sum Number and Reversal (in Just Math) Posted on 2016-06-24 (5 Comments) |

| computer assisted by Charlie (2016-06-24 14:03:57) |

Under Find From Four 2 (in Just Math) Posted on 2016-06-23 (4 Comments) |

| computer solution by Charlie (2016-06-23 17:02:39) |

Under 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) |

Under 2016 and Perfect Square Puzzle (in Just Math) Posted on 2016-06-22 (4 Comments) |

| computer solution by Charlie (2016-06-22 16:15:15) |

Under 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) |

| 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) |

Under 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) |

Under Find the killer (in Liars and Knights) Posted on 2016-06-20 (5 Comments) |

| solution by Charlie (2016-06-20 18:46:16) |

Under Circle cuts (in Shapes) Posted on 2016-06-20 (1 Comments) |

| Squaring the circle... by Charlie (2016-06-20 10:47:16) |

Under Hexadecimal Hinder (in Probability) Posted on 2016-06-19 (6 Comments) |

| re: part (i) solution --- correction by Charlie (2016-06-20 21:56:20) |

| part (iv) solution by Charlie (2016-06-20 10:37:02) |

| part (iii) solution by Charlie (2016-06-20 09:01:51) |

| Simulations for all parts by Charlie (2016-06-19 21:25:11) |

| part (ii) solution by Charlie (2016-06-19 18:44:57) |

| part (i) solution by Charlie (2016-06-19 15:07:44) |

Under Roman Numeral and Letter Insertion (in Word Problems) Posted on 2016-06-17 (2 Comments) |

| computer findings by Charlie (2016-06-17 14:27:27) |

Under Digit Finding with Hexadecimal Fibonacci (in Just Math) Posted on 2016-06-16 (1 Comments) |

| computer solution by Charlie (2016-06-16 15:09:16) |

Under A transpogram (in Word Problems) Posted on 2016-06-16 (1 Comments) |

| solution by Charlie (2016-06-16 09:53:34) |

Under Progressive probability (in Probability) Posted on 2016-06-15 (1 Comments) |

| computer exploration - solution for first part only by Charlie (2016-06-15 15:57:28) |

Under Comparing two events (in Probability) Posted on 2016-06-15 (3 Comments) |

| re: solution by Charlie (2016-06-16 09:47:20) |

| spoiler -- try it yourself first by Charlie (2016-06-16 09:43:00) |

Under Objective: Integer! (in Geometry) Posted on 2016-06-14 (4 Comments) |

| re: Interesting by Charlie (2016-06-15 07:44:09) |

| computer solution by Charlie (2016-06-14 15:43:05) |

Under Arithmetic Product Puzzle 2 (in Sequences) Posted on 2016-06-14 (2 Comments) |

| computer solution by Charlie (2016-06-14 09:55:53) |

Under Hundred Product Hinder (in Just Math) Posted on 2016-06-13 (2 Comments) |

| computer solution (seems unique) by Charlie (2016-06-13 15:15:33) |

Under Squared halves (in Numbers) Posted on 2016-06-10 (1 Comments) |

| computer solution (spoiler) by Charlie (2016-06-10 15:02:02) |

Under Term Finding with Floor (in Sequences) Posted on 2016-06-09 (3 Comments) |

| computer solution (spoiler) by Charlie (2016-06-09 10:31:50) |

Under 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) |

| computer assisted solution by Charlie (2016-06-08 13:19:16) |

Under Twice 2 products (in Numbers) Posted on 2016-06-07 (2 Comments) |

| re: Exhausted Spoiler -- doubling the answers by Charlie (2016-06-07 13:35:34) |

Under 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) |

Under Random Sum Resolution (in Probability) Posted on 2016-06-06 (1 Comments) |

| solution by Charlie (2016-06-06 10:51:52) |

Under Three expressions - same value (in Just Math) Posted on 2016-06-02 (3 Comments) |

| computer assisted solution by Charlie (2016-06-02 15:25:05) |

Under 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) |

Under King on the run (in Just Math) Posted on 2016-06-01 (5 Comments) |

| computer assisted solution by Charlie (2016-06-01 15:37:46) |

Under Edge problem (in Geometry) Posted on 2016-05-31 (3 Comments) |

| solution after a false assumption by Charlie (2016-05-31 16:07:57) |

Under Latin verse (in Word Problems) Posted on 2016-05-31 (5 Comments) |

| re: Very ancient latin by Charlie (2016-05-31 16:12:36) |

Under List the expressionist numbers (in Numbers) Posted on 2016-05-30 (10 Comments) |

| Part 1 down to 67 entries after eliminating the spurious by Charlie (2016-06-02 07:31:32) |

| 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) |

| Part 2 and Bonus by Charlie (2016-05-31 07:31:18) |

| Computer "solution" part 1 -- no guarantee of completeness by Charlie (2016-05-31 07:27:45) |

Under 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) |

| computer solution and discussion by Charlie (2016-05-29 11:22:38) |

Under Power of 2 (in Numbers) Posted on 2016-05-27 (6 Comments) |

| computer solution by Charlie (2016-05-27 15:12:52) |

Under Mark's itinerary (in Probability) Posted on 2016-05-26 (5 Comments) |

| re: An by Charlie (2016-05-29 14:06:54) |

| Analytic + Simulation + Probabilistic by Charlie (2016-05-26 14:22:24) |

Under 2016 and Simultaneous Settlement (in Just Math) Posted on 2016-05-26 (2 Comments) |

| computer solution (spoiler) by Charlie (2016-05-26 10:55:52) |

Under Duodecimal Element Sum Settlement (in Just Math) Posted on 2016-05-25 (3 Comments) |

| working in decimal, same answer by Charlie (2016-05-25 14:22:58) |

Under 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) |

| No Subject by Charlie (2016-05-25 11:37:33) |

Under Wanted: gifted numbers (in Numbers) Posted on 2016-05-24 (1 Comments) |

| computer assisted solution by Charlie (2016-05-24 16:06:42) |

Under Projection Ponder (in Shapes) Posted on 2016-05-23 (2 Comments) |

| solution (if I got the algebra right) by Charlie (2016-05-23 15:29:15) |

Under Gambler's policy (in Probability) Posted on 2016-05-20 (2 Comments) |

| computer assisted solution by Charlie (2016-05-20 17:48:05) |

Under Four Digit Combination Conclusion (in Sequences) Posted on 2016-05-18 (1 Comments) |

| solution by Charlie (2016-05-18 19:43:55) |

Under Grid exercise (in Just Math) Posted on 2016-05-18 (2 Comments) |

| 2-step method by Charlie (2016-05-18 19:49:08) |

Under A square problem (in Just Math) Posted on 2016-05-17 (1 Comments) |

| solution by Charlie (2016-05-17 12:45:44) |

Under AABBCCDD and Perfect Square (in Just Math) Posted on 2016-05-16 (3 Comments) |

| computer solutions by Charlie (2016-05-16 16:23:10) |

Under Two distinct questions (in Just Math) Posted on 2016-05-13 (1 Comments) |

| solution by Charlie (2016-05-13 14:46:05) |

Under From challenge to change (in Word Problems) Posted on 2016-05-12 (4 Comments) |

| 70% of them by Charlie (2016-05-12 14:19:12) |

Under Divisible by 198 (in Just Math) Posted on 2016-05-12 (2 Comments) |

| computer solution by Charlie (2016-05-12 10:05:07) |

Under Icosahedron addressed (in Geometry) Posted on 2016-05-11 (2 Comments) |

| The area and a start toward the volume by Charlie (2016-05-11 14:41:18) |

Under 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) |

| summing the series via computer by Charlie (2016-05-11 10:19:23) |

Under Tanya's puzzle (in Logic) Posted on 2016-05-10 (10 Comments) |

| re(4): could be by Charlie (2016-05-11 07:32:24) |

| could be by Charlie (2016-05-10 14:00:22) |

Under Make it true (in Numbers) Posted on 2016-05-09 (5 Comments) |

| via computer by Charlie (2016-05-09 15:45:58) |

| Quick solution by Charlie (2016-05-09 13:44:23) |

Under 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) |

Under First Term Finding (in Sequences) Posted on 2016-05-04 (2 Comments) |

| computer solution by Charlie (2016-05-04 13:13:53) |

Under LCM and GCD Equation (in Just Math) Posted on 2016-05-03 (2 Comments) |

| computer solution by Charlie (2016-05-03 19:05:37) |

Under Base Baffle (in Just Math) Posted on 2016-05-02 (2 Comments) |

| solution by Charlie (2016-05-02 14:35:06) |

Under Quadratic and Perfect Square Query (in Just Math) Posted on 2016-04-30 (2 Comments) |

| computer exploration -- probable spoiler by Charlie (2016-04-30 09:05:23) |

Under LCM and GCD Sequence (in Sequences) Posted on 2016-04-29 (1 Comments) |

| probable solution (spoiler) by Charlie (2016-04-29 11:30:46) |

Under One and only (in Numbers) Posted on 2016-04-28 (4 Comments) |

| re: spoiler by Charlie (2016-04-28 10:39:05) |

| computer assisted solution by Charlie (2016-04-28 10:34:13) |

Under M.G.'s wit (in Just Math) Posted on 2016-04-27 (3 Comments) |

| Dimensional Analysis by Charlie (2016-04-27 14:29:43) |

Under Think it over (in Logic) Posted on 2016-04-27 (6 Comments) |

| Solution to the distractor by Charlie (2016-04-27 10:35:42) |

Under No Carry Nuance (in Just Math) Posted on 2016-04-26 (3 Comments) |

| Part 1 by Charlie (2016-04-26 13:56:38) |

Under 2 diagonal sums (in Just Math) Posted on 2016-04-26 (1 Comments) |

| solution by Charlie (2016-04-26 10:09:11) |

Under 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) |

Under Cubic Diophantine Conclusion (in Just Math) Posted on 2016-04-22 (9 Comments) |

| computer exploration by Charlie (2016-04-22 11:11:58) |

Under Eight Digit Product Poser (in Just Math) Posted on 2016-04-20 (1 Comments) |

| with a little help from a Mintoris Basic program (Android) by Charlie (2016-04-20 13:46:12) |

Under 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) |

| Laying out the possibilities by Charlie (2016-04-20 10:36:25) |

Under Asteroid walk (in General) Posted on 2016-04-19 (8 Comments) |

| question by Charlie (2016-04-19 22:46:24) |

Under No Equal Weighings (in Weights and Scales) Posted on 2016-04-18 (4 Comments) |

| re: computer solution -- sampling of every 1000th valid sequence by Charlie (2016-04-18 15:10:27) |

| computer solution by Charlie (2016-04-18 14:55:28) |

Under An educated guess (in Probability) Posted on 2016-04-18 (7 Comments) |

| a new simulation by Charlie (2016-04-18 14:44:30) |

| preliminary simulation by Charlie (2016-04-18 09:01:29) |

| Preliminary guess by Charlie (2016-04-18 08:44:45) |

Under Mean Integer Illation (in Just Math) Posted on 2016-04-17 (1 Comments) |

| computer solution by Charlie (2016-04-17 15:30:22) |

Under Electrical Cube 3 (in Science) Posted on 2016-04-15 (1 Comments) |

| solution by Charlie (2016-04-15 19:29:21) |

Under Rectangular Crease Resolution (in Shapes) Posted on 2016-04-15 (2 Comments) |

| GSP says (7 significant figures) by Charlie (2016-04-15 09:52:15) |

Under Three ways - same sum (in Numbers) Posted on 2016-04-14 (3 Comments) |

| computer solution by Charlie (2016-04-14 09:42:14) |

Under Complex Ratio and Number Resolution (in Sequences) Posted on 2016-04-13 (2 Comments) |

| computer assisted solution by Charlie (2016-04-13 14:37:15) |

Under 1 to 9 concatenation (in Numbers) Posted on 2016-04-12 (7 Comments) |

| computer solution by Charlie (2016-04-12 14:58:24) |

Under 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) |

| computer exploration -- possible spoiler by Charlie (2016-04-11 15:49:43) |

Under Extreme Palindrome Exercise (in Just Math) Posted on 2016-04-11 (3 Comments) |

| agree by Charlie (2016-04-11 10:16:10) |

Under A Pythagorean triangle (in Numbers) Posted on 2016-04-08 (4 Comments) |

| computer solution by Charlie (2016-04-08 19:21:59) |

Under Square Settlement With Digits (in Just Math) Posted on 2016-04-07 (2 Comments) |

| computer solution by Charlie (2016-04-07 15:40:15) |

Under Tenacious Divisibility Treat (in Just Math) Posted on 2016-04-06 (9 Comments) |

| broll's interpretation is correct by Charlie (2016-04-07 10:41:07) |

| solution by Charlie (2016-04-06 10:14:35) |

Under Year Yearn 3 (in Just Math) Posted on 2016-04-05 (1 Comments) |

| computer solution by Charlie (2016-04-05 10:22:40) |

Under 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) |

| computer solution by Charlie (2016-04-04 19:14:42) |

Under Find this number (in Numbers) Posted on 2016-04-04 (1 Comments) |

| computer solution by Charlie (2016-04-04 11:21:07) |

Under Look for 3 sevens (in Numbers) Posted on 2016-04-01 (2 Comments) |

| computer finds overlooked values by Charlie (2016-04-01 10:48:18) |

Under 4 partitions, same product (in Numbers) Posted on 2016-03-31 (1 Comments) |

| computer solution and discussion by Charlie (2016-03-31 10:32:29) |

Under Fibs and Mods. (in Numbers) Posted on 2016-03-30 (1 Comments) |

| no proof here, just some verification, and a new fact by Charlie (2016-03-30 11:28:53) |

Under 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) |

| computer solution by Charlie (2016-03-29 15:45:59) |

Under Tatami Tiling (in Shapes) Posted on 2016-03-29 (2 Comments) |

| solution by Charlie (2016-03-29 10:27:33) |

Under Electrical Cube 2 (in Science) Posted on 2016-03-25 (1 Comments) |

| solution by Charlie (2016-03-25 10:22:17) |

Under Sum from Arithmetic and Geometric (in Sequences) Posted on 2016-03-24 (5 Comments) |

| computer solution by Charlie (2016-03-24 15:32:13) |

| re(2): Possible Solution by Charlie (2016-03-24 15:27:09) |

Under Double Reflection (in Geometry) Posted on 2016-03-24 (2 Comments) |

| solution by Charlie (2016-03-24 10:23:45) |

Under Minimizing n (in Numbers) Posted on 2016-03-23 (2 Comments) |

| computer confirmation (solution) by Charlie (2016-03-23 13:34:40) |

Under Neighbors or not? (in Probability) Posted on 2016-03-22 (3 Comments) |

| solution by Charlie (2016-03-22 13:21:52) |

Under Rational Value Validation (in Just Math) Posted on 2016-03-20 (11 Comments) |

| re: solution for 4 elements only by Charlie (2016-03-23 14:52:58) |

| 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) |

| Two special results by Charlie (2016-03-20 10:26:59) |

| a sampling of 500 at random by Charlie (2016-03-20 10:14:35) |

Under 2 coins (in Probability) Posted on 2016-03-18 (2 Comments) |

| Bayes by Charlie (2016-03-18 11:10:23) |

Under 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) |

| Values for the first 5 k by Charlie (2016-03-17 14:39:24) |

Under Find number and base (in Numbers) Posted on 2016-03-17 (6 Comments) |

| solution by Charlie (2016-03-17 10:41:11) |

Under Set Me Up Again (in Numbers) Posted on 2016-03-16 (1 Comments) |

| computer solution by Charlie (2016-03-16 16:10:34) |

Under Minimal cardinality (in Numbers) Posted on 2016-03-16 (3 Comments) |

| proposed solution by Charlie (2016-03-16 09:48:15) |

Under 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) |

| some lower numerator/denominator pairs by Charlie (2016-03-14 14:17:52) |

| computer-generated solving aid by Charlie (2016-03-14 09:05:33) |

Under Only one below 5000 (in Numbers) Posted on 2016-03-11 (4 Comments) |

| computer solution by Charlie (2016-03-11 15:28:34) |

Under Ring of triangles II (in Geometry) Posted on 2016-03-10 (2 Comments) |

| re: computer solution -- revised by Charlie (2016-03-10 10:09:56) |

| computer solution by Charlie (2016-03-10 09:43:35) |

Under More bouncing (in Geometry) Posted on 2016-03-09 (3 Comments) |

| re(2): proposed solution by Charlie (2016-03-10 07:32:51) |

| proposed solution by Charlie (2016-03-09 14:28:48) |

Under 8th Term from Term Product (in Sequences) Posted on 2016-03-07 (4 Comments) |

| computer solution by Charlie (2016-03-07 13:43:58) |

Under d1 or more ? (in Numbers) Posted on 2016-03-07 (4 Comments) |

| thoughts by Charlie (2016-03-07 09:49:56) |

Under 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) |

| computer solution by Charlie (2016-03-03 15:20:13) |

Under Cheese Cut Calculation (in Just Math) Posted on 2016-03-03 (1 Comments) |

| computer solution by Charlie (2016-03-03 11:31:38) |

Under Ring of triangles I (in Geometry) Posted on 2016-03-02 (2 Comments) |

| computer solution -- spoiler by Charlie (2016-03-02 15:41:57) |

Under Arithmetic Roots (in Just Math) Posted on 2016-03-02 (2 Comments) |

| solution with computer assist by Charlie (2016-03-02 10:32:09) |

Under Light Beam Reflection (in Shapes) Posted on 2016-03-01 (1 Comments) |

| solution by Charlie (2016-03-01 15:22:28) |

Under 13 and 2 (in Numbers) Posted on 2016-03-01 (6 Comments) |

| re: answer by Charlie (2016-03-01 09:20:29) |

| computer still finds no solution by Charlie (2016-03-01 09:17:38) |

Under 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) |

Under Miles to Kilometers (in General) Posted on 2016-02-26 (3 Comments) |

| re: quick Excel solution by Charlie (2016-02-26 10:07:44) |

| computer solution by Charlie (2016-02-26 10:03:15) |

Under Initial Term Illation (in Sequences) Posted on 2016-02-25 (2 Comments) |

| computer solution by Charlie (2016-02-25 16:03:19) |

Under A Non-Reintersecting Tangent (in Calculus) Posted on 2016-02-24 (1 Comments) |

| solution by Charlie (2016-02-24 15:09:22) |

Under 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 -- spoiler by Charlie (2016-02-24 12:18:06) |

Under In a bar (in Probability) Posted on 2016-02-23 (6 Comments) |

| re: Last Call by Charlie (2016-02-24 10:22:27) |

| solution, with caveat by Charlie (2016-02-23 14:03:10) |

Under Cheese Cut Conclusion (in Shapes) Posted on 2016-02-23 (2 Comments) |

| it would seem... (spoiler) by Charlie (2016-02-23 11:20:35) |

Under Geometric and Three Power Travail (in Sequences) Posted on 2016-02-22 (2 Comments) |

| computer assisted solution by Charlie (2016-02-22 12:17:23) |

Under Counting Ten Segment Paths (in General) Posted on 2016-02-19 (6 Comments) |

| The basic set (rotations and reflections eliminated) by Charlie (2016-02-19 20:48:00) |

| Missed a few before--now added; As well as I can classify them by Charlie (2016-02-19 14:59:11) |

| re(2): As many as I found by Charlie (2016-02-19 14:37:35) |

| re: As many as I found by Charlie (2016-02-19 14:09:29) |

| computer solution by Charlie (2016-02-19 13:29:41) |

Under 25 * 1 (in Just Math) Posted on 2016-02-18 (3 Comments) |

| re(2): solution - what about these? -- back to the computer by Charlie (2016-02-18 13:50:04) |

| solution by Charlie (2016-02-18 10:55:02) |

Under 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) |

| computer solution by Charlie (2016-02-17 20:16:44) |

Under 1-2-3 Remainder Resolution (in Logic) Posted on 2016-02-16 (12 Comments) |

| computer solution by Charlie (2016-02-16 11:59:08) |

Under Big difference (in Numbers) Posted on 2016-02-14 (4 Comments) |

| re(3): computer solutions by Charlie (2016-02-14 20:05:51) |

| computer solutions by Charlie (2016-02-14 15:03:30) |

Under Optimal Order (in Sequences) Posted on 2016-02-10 (5 Comments) |

| re: This should work by Charlie (2016-02-14 11:33:18) |

Under How high the moon tonight (in Numbers) Posted on 2016-02-10 (1 Comments) |

| computer solution by Charlie (2016-02-10 12:36:36) |

Under 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) |

| on the other hand by Charlie (2016-02-09 16:15:26) |

| 2 computer solutions; the second is probably right by Charlie (2016-02-09 16:06:19) |

Under Pumpkins 7 (in Just Math) Posted on 2016-02-05 (2 Comments) |

| computer solution by Charlie (2016-02-05 15:41:05) |

Under Evaluate further probabilities (in Probability) Posted on 2016-02-03 (1 Comments) |

| computer-aided solution by Charlie (2016-02-03 11:18:01) |

Under 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) |

| computer solution by Charlie (2016-02-02 15:37:44) |

Under Find From First and Last (in Just Math) Posted on 2016-02-02 (1 Comments) |

| computer solution by Charlie (2016-02-02 11:27:00) |

Under Mille and Remainder Resolution (in Sequences) Posted on 2016-02-01 (3 Comments) |

| spoiler solution; can it clue toward the intended method? by Charlie (2016-02-02 07:56:22) |

Under N Nine Nuance (in Just Math) Posted on 2016-01-29 (6 Comments) |

| re: possible solution by Charlie (2016-01-29 11:11:04) |

| computer solution by Charlie (2016-01-29 10:47:03) |

Under Erase the right 90 (in Numbers) Posted on 2016-01-28 (5 Comments) |

| re: Sequence? by Charlie (2016-01-29 11:33:30) |

| proof on the internet (spoiler) by Charlie (2016-01-28 15:16:54) |

Under Last term zero (in Sequences) Posted on 2016-01-28 (3 Comments) |

| re: Spoiler by Charlie (2016-01-28 10:22:55) |

Under 5 cubes (in Numbers) Posted on 2016-01-26 (1 Comments) |

| computer solution by Charlie (2016-01-26 15:29:18) |

Under Evaluate probabilities (in Probability) Posted on 2016-01-26 (3 Comments) |

| simple understanding, and randomization procedures by Charlie (2016-01-26 11:37:16) |

Under Floor Function Query (in Just Math) Posted on 2016-01-25 (1 Comments) |

| computer solution by Charlie (2016-01-25 11:16:57) |

Under 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) |

| computer solution by Charlie (2016-01-22 15:26:29) |

Under Hypotenuse from Cone (in Shapes) Posted on 2016-01-22 (2 Comments) |

| same solution numerically by Charlie (2016-01-22 10:42:20) |

Under Binary Palindrome and Near Magic Square (in Just Math) Posted on 2016-01-21 (1 Comments) |

| computer solution by Charlie (2016-01-21 15:48:43) |

Under 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) |

Under 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) |

Under 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) |

| Outline of a sample solution by Charlie (2016-01-18 15:50:43) |

Under 6 coins (in Weights and Scales) Posted on 2016-01-13 (10 Comments) |

| 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) |

| computer solution by Charlie (2016-01-13 14:32:07) |

| computer attempt by Charlie (2016-01-13 13:42:02) |

| re: Solution by Charlie (2016-01-13 12:40:10) |

Under Expose ambiguity (in Logic) Posted on 2016-01-13 (5 Comments) |

| one possible set by Charlie (2016-01-13 09:11:38) |

Under Sine in a Circle (in Shapes) Posted on 2016-01-11 (1 Comments) |

| solution by Charlie (2016-01-11 15:13:50) |

Under Primevens and primeodds (in Numbers) Posted on 2016-01-10 (8 Comments) |

| 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 stats by Charlie (2016-01-10 14:12:52) |

Under Lost in the woods (in Just Math) Posted on 2016-01-08 (12 Comments) |

| proposed solution by Charlie (2016-01-08 15:43:08) |

Under Pumpkins 5 (in Weights and Scales) Posted on 2016-01-06 (2 Comments) |

| computer solution by Charlie (2016-01-06 11:25:21) |

Under Test #9 (in Word Problems) Posted on 2016-01-05 (3 Comments) |

| from my word list by Charlie (2016-01-05 11:30:24) |

Under Twenty deposits (in Just Math) Posted on 2016-01-04 (4 Comments) |

| solution by Charlie (2016-01-04 15:33:04) |

Under One out of Five (in Weights and Scales) Posted on 2016-01-04 (2 Comments) |

| My solution is way too convoluted by Charlie (2016-01-04 10:54:12) |

Under Arithmetic Triplet Ascertainment (in Just Math) Posted on 2016-01-03 (1 Comments) |

| Heuristic solution by Charlie (2016-01-03 10:57:44) |

Under Peaceful superqueens (in General) Posted on 2015-12-31 (2 Comments) |

| computer solutions by Charlie (2015-12-31 15:16:31) |

Under Infinite Illation Decision (in Just Math) Posted on 2015-12-31 (3 Comments) |

| It seems... by Charlie (2015-12-31 10:18:36) |

Under Monotonous integers (in Numbers) Posted on 2015-12-30 (9 Comments) |

| solution, starting out with analytic by Charlie (2015-12-30 13:51:37) |

Under A five letter word (in Word Problems) Posted on 2015-12-28 (6 Comments) |

| computer solution by Charlie (2015-12-28 21:04:38) |

Under From pie to numbers (in Numbers) Posted on 2015-12-27 (14 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) |

| computer solution by Charlie (2015-12-27 13:40:30) |

Under 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) |

Under Ten cities (in Cryptography) Posted on 2015-12-24 (1 Comments) |

| computer solution by Charlie (2015-12-24 10:48:08) |

Under Power and Digit Poser (in Just Math) Posted on 2015-12-23 (2 Comments) |

| solution by Charlie (2015-12-23 11:01:08) |

Under Pentagon and Reflection Poser (in Shapes) Posted on 2015-12-22 (1 Comments) |

| Graphing calculator solution by Charlie (2015-12-22 15:10:33) |

Under 5-2=1 (in Word Problems) Posted on 2015-12-21 (5 Comments) |

| computer solution by Charlie (2015-12-21 10:29:33) |

Under 80 (in Numbers) Posted on 2015-12-19 (3 Comments) |

| computer solutions for all but 2359 by Charlie (2015-12-19 13:15:36) |

Under Some sequences! (in Sequences) Posted on 2015-12-18 (1 Comments) |

| computer solution by Charlie (2015-12-18 11:00:18) |

Under 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) |

| computer solution by Charlie (2015-12-16 15:13:21) |

Under Protecting the fleet Parts C. & D. (in Geometry) Posted on 2015-12-15 (2 Comments) |

| solution by Charlie (2015-12-15 18:58:34) |

Under A peculiar pandigital (in Numbers) Posted on 2015-12-14 (2 Comments) |

| All of them by Charlie (2015-12-14 19:06:38) |

Under 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) |

| solutions by Charlie (2015-12-14 15:04:04) |

Under Four Digit and Two Digit Treat (in Just Math) Posted on 2015-12-13 (1 Comments) |

| computer solution by Charlie (2015-12-13 18:21:48) |

Under Using a standard deck (in Numbers) Posted on 2015-12-11 (2 Comments) |

| re: Solution by Charlie (2015-12-12 08:09:11) |

Under A peculiar triangular number (in Numbers) Posted on 2015-12-10 (2 Comments) |

| computer solution (spoiler) by Charlie (2015-12-10 18:00:00) |

Under Triple Letter Occurrence, Twice! (in Word Problems) Posted on 2015-12-10 (3 Comments) |

| computer solution 6-, 7- and 8-letter words by Charlie (2015-12-10 09:13:26) |

Under Two Light Coins (in Weights and Scales) Posted on 2015-12-09 (1 Comments) |

| solution by Charlie (2015-12-09 19:44:31) |

Under Hold your horses (in General) Posted on 2015-12-09 (3 Comments) |

| solution by Charlie (2015-12-09 13:07:08) |

Under A special short-list (in Numbers) Posted on 2015-12-08 (3 Comments) |

| solution with computer-generated list by Charlie (2015-12-08 10:45:22) |

Under Fibonaccish ratio (in Sequences) Posted on 2015-12-07 (3 Comments) |

| re(2): solution by Charlie (2015-12-07 19:54:13) |

| solution by Charlie (2015-12-07 18:01:58) |

Under Cos Case Concern (in Shapes) Posted on 2015-12-06 (4 Comments) |

| re: Two solutions by Charlie (2015-12-06 15:08:11) |

Under List of pairs (in Just Math) Posted on 2015-12-04 (2 Comments) |

| computer solution -- first eight pairs by Charlie (2015-12-04 11:27:37) |

Under A Math Problem (in Just Math) Posted on 2015-12-03 (6 Comments) |

| computer solution of a way that works by Charlie (2015-12-03 15:28:25) |

Under Get the right product (in Just Math) Posted on 2015-12-01 (5 Comments) |

| 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) |

Under Daylight Saving (in Cryptography) Posted on 2015-12-01 (4 Comments) |

| re: Wrong Answer (spoiler) by Charlie (2015-12-01 11:20:44) |

Under Increasing sequences (in Just Math) Posted on 2015-11-30 (3 Comments) |

| computer solution by Charlie (2015-11-30 14:48:11) |

Under 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) |

Under 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) |

| computer solution -- smallest nine values by Charlie (2015-11-27 15:30:18) |

Under Root factorial (in Numbers) Posted on 2015-11-25 (1 Comments) |

| thoughts by Charlie (2015-11-25 15:01:26) |

Under Square in a notched square (in Geometry) Posted on 2015-11-25 (3 Comments) |

| A method of calculation--needs simplification. by Charlie (2015-11-25 10:22:26) |

Under Biggest and smallest (in Just Math) Posted on 2015-11-24 (2 Comments) |

| computer solution by Charlie (2015-11-24 10:34:15) |

Under Summing Consecutive Terms and Pair Determination (in Sequences) Posted on 2015-11-21 (3 Comments) |

| computer solution by Charlie (2015-11-21 13:11:45) |

Under Generalizing II (in Sequences) Posted on 2015-11-20 (2 Comments) |

| a way to calculate by Charlie (2015-11-20 14:45:19) |

Under 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) |

| analytic solution, subject to error by Charlie (2015-11-19 11:13:05) |

Under If you go (in Numbers) Posted on 2015-11-18 (2 Comments) |

| computer solution by Charlie (2015-11-18 16:12:10) |

Under Upgrading procedure (in Just Math) Posted on 2015-11-17 (1 Comments) |

| computer solution by Charlie (2015-11-17 18:57:42) |

Under 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) |

| d2 answers by Charlie (2015-11-17 10:37:59) |

Under Cryptajoke XII (in Cryptography) Posted on 2015-11-16 (2 Comments) |

| solution (spoiler) by Charlie (2015-11-16 12:31:12) |

Under 9-letter word II (in Sequences) Posted on 2015-11-13 (1 Comments) |

| computer aided solution by Charlie (2015-11-13 15:49:41) |

Under 6 or less liars (in Liars and Knights) Posted on 2015-11-13 (16 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 by Charlie (2015-11-13 10:50:54) |

Under 3c+2v (in Word Problems) Posted on 2015-11-12 (3 Comments) |

| computer solution by Charlie (2015-11-12 13:23:55) |

Under Two sisters (in Famous Riddles) Posted on 2015-11-12 (2 Comments) |

| re: Possible solution by Charlie (2015-11-12 10:47:27) |

Under Sphere Intersections (in Geometry) Posted on 2015-11-11 (4 Comments) |

| My thinking on it. by Charlie (2015-11-11 15:28:50) |

Under Count the palindromes (in Just Math) Posted on 2015-11-11 (7 Comments) |

| computer solution by Charlie (2015-11-11 10:27:25) |

Under Wise saw (in General) Posted on 2015-11-10 (3 Comments) |

| re: 2/3 solution (spoiler) by Charlie (2015-11-10 14:04:57) |

Under Tiling and counting (in Numbers) Posted on 2015-11-10 (2 Comments) |

| He's back by Charlie (2015-11-10 10:49:22) |

Under â€¦.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) |

| The one that seems obvious by Charlie (2015-11-09 12:38:10) |

Under Cryptajoke XI (in Cryptography) Posted on 2015-11-09 (1 Comments) |

| spoilers by Charlie (2015-11-09 10:32:52) |

Under Cons and vows (in Word Problems) Posted on 2015-11-06 (6 Comments) |

| #3 by Charlie (2015-11-09 07:55:24) |

Under Four factors (in Just Math) Posted on 2015-11-06 (2 Comments) |

| by induction, not rigorous by Charlie (2015-11-06 09:56:37) |

Under 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) |

| most paired up by Charlie (2015-11-05 15:42:36) |

Under 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 -- calculations by computer by Charlie (2015-11-05 10:06:29) |

Under 10 4 7 10 (in Just Math) Posted on 2015-11-03 (2 Comments) |

| computer solutions by Charlie (2015-11-03 14:31:07) |

Under 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) |

| a quick look by Charlie (2015-11-03 08:50:28) |

Under Seven numbers for seven words (in Cryptography) Posted on 2015-11-02 (1 Comments) |

| computer assisted solution by Charlie (2015-11-02 14:48:09) |

Under Diophantine Linear and Quadratic (in Just Math) Posted on 2015-11-01 (4 Comments) |

| computer solution by Charlie (2015-11-01 13:26:19) |

| re: Analytical solution (spoiler) by Charlie (2015-11-01 13:04:04) |

Under Incredible, but solvable (in Just Math) Posted on 2015-10-30 (11 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) |

| re(2): computer aided solution -- continued by Charlie (2015-10-30 15:28:09) |

| re: computer aided solution -- continued by Charlie (2015-10-30 15:26:16) |

| computer aided solution by Charlie (2015-10-30 15:23:50) |

Under A plural of a plural (in Word Problems) Posted on 2015-10-30 (5 Comments) |

| What moderns do with Latin by Charlie (2015-10-30 10:25:35) |

Under Term Sum Settlement (in Sequences) Posted on 2015-10-29 (3 Comments) |

| Well, it could have been solved manually, but... by Charlie (2015-10-29 14:31:45) |

Under No peace (in Word Problems) Posted on 2015-10-29 (4 Comments) |

| re: Some clarifications by Charlie (2015-10-30 10:29:09) |

| Most, but not all by Charlie (2015-10-29 09:49:17) |

Under 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) |

| proposed solution by Charlie (2015-10-28 10:38:43) |

Under Real Number Resolution 2 (in Just Math) Posted on 2015-10-27 (1 Comments) |

| proposed solution by Charlie (2015-10-27 16:00:01) |

Under Numbered Letters IV (in Word Problems) Posted on 2015-10-26 (2 Comments) |

| computer solution by Charlie (2015-10-26 15:37:59) |

Under Magic matrix (in Just Math) Posted on 2015-10-26 (1 Comments) |

| computer solution by Charlie (2015-10-26 10:55:37) |

Under Sum Equality and Perfect Square (in Just Math) Posted on 2015-10-25 (2 Comments) |

| computer solution by Charlie (2015-10-25 14:44:58) |

Under Must differ by 3 (in Just Math) Posted on 2015-10-23 (3 Comments) |

| computer proof by Charlie (2015-10-23 13:03:39) |

Under Extend the list (in Word Problems) Posted on 2015-10-22 (2 Comments) |

| some more by Charlie (2015-10-22 21:46:42) |

Under More ones (in Just Math) Posted on 2015-10-21 (1 Comments) |

| computer solution by Charlie (2015-10-21 15:27:42) |

Under Distinct Values Determination (in Just Math) Posted on 2015-10-20 (4 Comments) |

| the missing values by Charlie (2015-10-20 11:44:21) |

| computer solution differs by Charlie (2015-10-20 11:25:46) |

Under Factorials & factorions (in Numbers) Posted on 2015-10-19 (2 Comments) |

| computer solution by Charlie (2015-10-19 14:42:49) |

Under Will you find it? (in Cryptography) Posted on 2015-10-19 (2 Comments) |

| It, or them? by Charlie (2015-10-19 14:39:45) |

Under Generalizing (in Geometry) Posted on 2015-10-16 (2 Comments) |

| just offhand... by Charlie (2015-10-16 22:28:38) |

Under Palindromes and Divisibility (in Just Math) Posted on 2015-10-16 (3 Comments) |

| re: analytic solution by Charlie (2015-10-16 14:16:53) |

| computer solution by Charlie (2015-10-16 10:50:58) |

Under Oblong Difference Observation (in Just Math) Posted on 2015-10-15 (3 Comments) |

| two more solutions (computer solutions) by Charlie (2015-10-15 13:58:20) |

Under Same digits - 3 cubes (in Numbers) Posted on 2015-10-14 (1 Comments) |

| computer solution by Charlie (2015-10-14 10:45:14) |

Under Triangular and Square Settlement (in Just Math) Posted on 2015-10-13 (7 Comments) |

| extended list by Charlie (2015-10-14 08:09:55) |

| computer solution by Charlie (2015-10-13 15:34:15) |

Under Integer Count Illation (in Just Math) Posted on 2015-10-12 (1 Comments) |

| solution by Charlie (2015-10-12 15:29:02) |

Under Count them correctly (in Numbers) Posted on 2015-10-12 (2 Comments) |

| same answer by Charlie (2015-10-12 10:42:20) |

Under Permutations count redux (in Numbers) Posted on 2015-10-09 (1 Comments) |

| first simpler consideration by Charlie (2015-10-12 13:46:19) |

Under Integer Function Finding (in Just Math) Posted on 2015-10-09 (1 Comments) |

| computer guided guess by Charlie (2015-10-09 11:22:43) |

Under sum of digits and 100th term (in Sequences) Posted on 2015-10-08 (3 Comments) |

| I did miss something in the previous post. by Charlie (2015-10-09 08:27:51) |

| I've probably miscounted but here goes. by Charlie (2015-10-08 21:24:23) |

Under 8 digit rhyme (in Cryptography) Posted on 2015-10-08 (1 Comments) |

| solution (spoiler) by Charlie (2015-10-08 10:44:23) |

Under Non zero product (in Just Math) Posted on 2015-10-07 (1 Comments) |

| computer assisted calculation by Charlie (2015-10-07 20:02:02) |

Under Digit sum and digit product equality (in Just Math) Posted on 2015-10-06 (2 Comments) |

| computer aided solution by Charlie (2015-10-06 20:28:06) |

Under Random Choice (in Probability) Posted on 2015-10-02 (1 Comments) |

| solution by Charlie (2015-10-02 10:25:48) |

Under 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 by Charlie (2015-10-01 16:02:09) |

Under 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) |

Under 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) |

| the computer doesn't tire of writing the numbers by Charlie (2015-09-28 15:56:47) |

Under Cryptajoke IX (in Cryptography) Posted on 2015-09-28 (2 Comments) |

| way by Charlie (2015-09-28 10:31:35) |

Under 9-letter word (in Numbers) Posted on 2015-09-25 (6 Comments) |

| re(2): computer solutions by Charlie (2015-09-26 07:35:38) |

| computer solutions by Charlie (2015-09-25 16:15:56) |

Under Quit as a winner (in Games) Posted on 2015-09-24 (8 Comments) |

| re(2): some research (spoiler) by Charlie (2015-09-24 18:35:16) |

| 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) |

| computer exploration by Charlie (2015-09-24 15:05:47) |

Under Cheryl's b-day (in Logic) Posted on 2015-09-24 (2 Comments) |

| solution by Charlie (2015-09-24 10:16:36) |

Under Three brothers (in Just Math) Posted on 2015-09-23 (1 Comments) |

| solution by Charlie (2015-09-23 11:25:20) |

Under 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) |

| computer solution by Charlie (2015-09-22 17:23:10) |

Under Hexakosioihexekontahexaphobia (in General) Posted on 2015-09-22 (3 Comments) |

| It seems... by Charlie (2015-09-22 10:02:04) |

Under Rook Placement (in Games) Posted on 2015-09-21 (5 Comments) |

| re: Detailed solution (SPOILER) by Charlie (2015-09-26 07:51:35) |

Under Three Power and Product Divisibility (in Just Math) Posted on 2015-09-19 (2 Comments) |

| re: computer exploration by Charlie (2015-09-20 18:58:36) |

| computer exploration by Charlie (2015-09-20 07:56:20) |

Under 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) |

| computer exploration -- far from a proof by Charlie (2015-09-18 12:37:49) |

Under 2 easy cryptajokes (VIII) (in Cryptography) Posted on 2015-09-18 (3 Comments) |

| caught the thief -- not the fish by Charlie (2015-09-18 09:21:00) |

Under Some definite results (in Numbers) Posted on 2015-09-17 (5 Comments) |

| re: non-analytic solution by Charlie (2015-09-18 08:27:49) |

Under Marissa's and Melissa's birthdays (in Logic) Posted on 2015-09-17 (1 Comments) |

| solution with some computer assistance by Charlie (2015-09-17 12:20:00) |

Under 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) |

| computer exploration (probable spoiler) by Charlie (2015-09-16 16:13:12) |

Under Coordinating arrival (in Just Math) Posted on 2015-09-15 (2 Comments) |

| solution by Charlie (2015-09-15 10:57:22) |

Under 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) |

| re: A valiant attempt by Charlie (2015-09-14 20:30:42) |

| computer exploration by Charlie (2015-09-14 16:19:42) |

Under Square Sum and Square Multiple (in Just Math) Posted on 2015-09-13 (2 Comments) |

| An extended list -- Using Visual Basic by Charlie (2015-09-13 14:54:43) |

Under Prime Ratio Possibility (in Just Math) Posted on 2015-09-11 (3 Comments) |

| solution by Charlie (2015-09-11 11:04:22) |

Under 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 by Charlie (2015-09-10 17:16:31) |

Under One-liners (in General) Posted on 2015-09-09 (4 Comments) |

| oh, yes; forgot this by Charlie (2015-09-09 20:01:53) |

| mostly computer solution by Charlie (2015-09-09 15:49:58) |

Under Three-syllable word (in Tricks) Posted on 2015-09-07 (3 Comments) |

| probably... by Charlie (2015-09-07 12:38:11) |

Under Quadratic and Quartic Query (in Just Math) Posted on 2015-09-06 (3 Comments) |

| computer solution -- the 33 lowest. by Charlie (2015-09-06 14:13:34) |

Under Simultaneous Pythagorean Poser 2 (in Just Math) Posted on 2015-09-05 (4 Comments) |

| corrected computer solution by Charlie (2015-09-06 08:46:20) |

| computer solution by Charlie (2015-09-05 12:48:30) |

Under Six countries (in General) Posted on 2015-09-04 (8 Comments) |

| re: Alternate solution by Charlie (2015-09-04 18:22:38) |

| re(3): If only! (more of a spoiler) by Charlie (2015-09-04 15:32:13) |

| re: If only! (more of a spoiler) by Charlie (2015-09-04 10:56:00) |

Under 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) |

Under Digit Product Puzzle (in Probability) Posted on 2015-09-03 (3 Comments) |

| re(2): analytic solution -- corrected by Charlie (2015-09-03 16:32:01) |

| analytic solution by Charlie (2015-09-03 11:06:44) |

Under Arithmetic and Power Puzzle (in Just Math) Posted on 2015-09-02 (2 Comments) |

| computer exploration by Charlie (2015-09-02 15:08:39) |

Under Surprising answer (in Probability) Posted on 2015-09-02 (6 Comments) |

| solution by Charlie (2015-09-02 11:45:16) |

Under Muchos idiomas (in Word Problems) Posted on 2015-09-01 (1 Comments) |

| computer solution by Charlie (2015-09-01 16:09:14) |

Under 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) |

| metasolution by Charlie (2015-09-01 09:59:46) |

Under Cryptajoke VII (in Word Problems) Posted on 2015-08-31 (2 Comments) |

| solution (spoiler) by Charlie (2015-08-31 15:46:48) |

Under Homophone Hunt 2 (in Word Problems) Posted on 2015-08-31 (3 Comments) |

| another by Charlie (2015-08-31 09:57:39) |

Under A Fibo quadruplet (in Numbers) Posted on 2015-08-28 (1 Comments) |

| solution by Charlie (2015-08-28 11:05:46) |

Under What am I ? (in Riddles) Posted on 2015-08-27 (1 Comments) |

| You are... by Charlie (2015-08-27 09:49:41) |

Under Divide et impera part two (in Numbers) Posted on 2015-08-26 (2 Comments) |

| Much data but no proof--computer exploration by Charlie (2015-08-26 12:58:28) |

Under Only 2 answers (in Numbers) Posted on 2015-08-26 (3 Comments) |

| re(2): computer solution by Charlie (2015-08-26 14:30:25) |

| computer solution by Charlie (2015-08-26 11:17:03) |

Under Hockey pucks (in Logic) Posted on 2015-08-25 (1 Comments) |

| solution by Charlie (2015-08-25 14:31:58) |

Under Year and Perfect Square Puzzle (in Just Math) Posted on 2015-08-22 (2 Comments) |

| computer solution by Charlie (2015-08-22 15:55:34) |

Under Numbers in pi (in Numbers) Posted on 2015-08-21 (3 Comments) |

| computer solution by Charlie (2015-08-21 10:34:23) |

Under 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 by Charlie (2015-08-20 13:48:19) |

Under Visit USA (in General) Posted on 2015-08-20 (9 Comments) |

| If the goal is... by Charlie (2015-08-20 10:42:57) |

| re: solution by Charlie (2015-08-20 10:39:14) |

Under A self-working card trick (in Tricks) Posted on 2015-08-19 (1 Comments) |

| solution by Charlie (2015-08-19 15:17:04) |

Under This or that? (in Probability) Posted on 2015-08-19 (4 Comments) |

| My take on it by Charlie (2015-08-19 10:03:55) |

Under Divide et impera (in Numbers) Posted on 2015-08-18 (2 Comments) |

| three computer solutions by Charlie (2015-08-18 12:02:45) |

Under Perfect Square Digit (in Just Math) Posted on 2015-08-17 (2 Comments) |

| Can't find any under 10 billion by Charlie (2015-08-18 08:01:58) |

Under Ez & true (in Riddles) Posted on 2015-08-17 (1 Comments) |

| The saying by Charlie (2015-08-18 07:54:46) |

Under 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) |

Under Rooting for 2015 (in Just Math) Posted on 2015-08-14 (3 Comments) |

| confirmed solution by Charlie (2015-08-14 10:22:22) |

Under Arithmetic Product Puzzle (in Sequences) Posted on 2015-08-13 (1 Comments) |

| computer solution by Charlie (2015-08-13 14:52:35) |

Under Eight efficient blacksmiths (in Just Math) Posted on 2015-08-13 (4 Comments) |

| re: solution by Charlie (2015-08-13 09:31:05) |

| solution by Charlie (2015-08-13 09:26:03) |

Under Power and Divisibility Puzzle (in Just Math) Posted on 2015-08-12 (6 Comments) |

| computer solution by Charlie (2015-08-12 15:50:13) |

Under 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 by Charlie (2015-08-11 15:56:22) |

Under Positive Integer and Power Puzzle (in Logic) Posted on 2015-08-10 (1 Comments) |

| computer solution by Charlie (2015-08-10 19:23:20) |

Under Oddday (in Numbers) Posted on 2015-08-10 (4 Comments) |

| re: No math on vacation by Charlie (2015-08-11 15:55:16) |

Under Clever counting (in Numbers) Posted on 2015-08-07 (6 Comments) |

| re: Part b researched solution by Charlie (2015-08-08 08:20:18) |

| 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) |

| part a computer solution by Charlie (2015-08-07 18:59:07) |

Under Largest pandigital prime. (in Numbers) Posted on 2015-08-07 (1 Comments) |

| computer solution by Charlie (2015-08-07 12:21:30) |

Under one 3 or one 7 puzzle (in Just Math) Posted on 2015-08-06 (3 Comments) |

| computer solution by Charlie (2015-08-06 13:30:07) |

Under Factorial Ratio Sum Puzzle (in Calculus) Posted on 2015-08-04 (3 Comments) |

| computer solution: It quickly converges by Charlie (2015-08-04 09:14:25) |

Under Odd and Even 2 (in Just Math) Posted on 2015-08-03 (4 Comments) |

| computer solution by Charlie (2015-08-03 10:15:05) |

| re: solution by Charlie (2015-08-03 09:53:39) |

Under Ocean Anagram â€“ Not (in Word Problems) Posted on 2015-07-31 (3 Comments) |

| re: a d1 solution by Charlie (2015-07-31 09:12:36) |

Under 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) |

| computer solution by Charlie (2015-07-30 14:56:26) |

Under Red, White, and Blue (in Logic) Posted on 2015-07-29 (4 Comments) |

| computer proof by Charlie (2015-07-29 14:35:28) |

Under 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) |

| computer solution by Charlie (2015-07-29 09:58:22) |

Under No letters (in Cryptography) Posted on 2015-07-27 (2 Comments) |

| I learn to initialize arrays in VB 5 by Charlie (2015-07-27 14:20:25) |

Under Integer Triangle Side Puzzle (in Shapes) Posted on 2015-07-26 (1 Comments) |

| computer solution by Charlie (2015-07-26 10:56:57) |

Under 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) |

| computer-aided solution by Charlie (2015-07-25 13:22:55) |

Under 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) |

| computer solution by Charlie (2015-07-23 11:57:51) |

| re: computer solution by Charlie (2015-07-23 11:37:25) |

| only a start by Charlie (2015-07-23 08:27:41) |

Under One of the countries (in Word Problems) Posted on 2015-07-22 (2 Comments) |

| computer solution by Charlie (2015-07-22 15:46:50) |

Under Yearly Division (in Just Math) Posted on 2015-07-22 (1 Comments) |

| solution by Charlie (2015-07-22 13:39:52) |

Under Initial Term Identification (in Sequences) Posted on 2015-07-21 (3 Comments) |

| electronically computed by Charlie (2015-07-21 15:08:06) |

Under 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) |

| answer by Charlie (2015-07-21 11:09:44) |

Under Guessing suit (in Probability) Posted on 2015-07-20 (13 Comments) |

| simulation by Charlie (2015-07-21 10:25:25) |

| re: senseless task ! by Charlie (2015-07-20 11:09:49) |

Under Picking numbers (in Probability) Posted on 2015-07-17 (7 Comments) |

| re: Solution by Charlie (2015-07-29 10:22:14) |

| computer solution by Charlie (2015-07-17 15:11:20) |

| re: Analytical Solution (spoiler) by Charlie (2015-07-17 15:08:32) |

Under Pasta wrestling (in Word Problems) Posted on 2015-07-17 (1 Comments) |

| solution by Charlie (2015-07-17 10:53:58) |

Under Smallest Perfect Cube Puzzle (in Just Math) Posted on 2015-07-15 (2 Comments) |

| simulation of manual trials by Charlie (2015-07-15 16:19:57) |

| computer assisted solution by Charlie (2015-07-15 16:03:18) |

Under Pieces of eight (in Just Math) Posted on 2015-07-15 (2 Comments) |

| some computer aid by Charlie (2015-07-15 10:46:46) |

Under Powers of Ten (in Sequences) Posted on 2015-07-14 (7 Comments) |

| re: Pwerful answer (spoiler) by Charlie (2015-07-14 16:14:00) |

Under 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) |

| 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) |

| computer aided solution by Charlie (2015-07-13 18:49:13) |

Under Beginning and End (in Just Math) Posted on 2015-07-11 (6 Comments) |

| The Fibonacci connection by Charlie (2015-07-12 08:52:04) |

| More precision with UBASIC computer program by Charlie (2015-07-11 09:36:36) |

Under Long Reverse Rigor (in Word Problems) Posted on 2015-07-10 (3 Comments) |

| words with 15 or more letters, with lengths by Charlie (2015-07-10 19:14:53) |

Under Inverse Quadratic Sum Puzzle (in Just Math) Posted on 2015-07-09 (1 Comments) |

| steps with some internet help by Charlie (2015-07-09 12:56:06) |

Under Inverse Expression Exercise (in Just Math) Posted on 2015-07-07 (1 Comments) |

| probabile solution by Charlie (2015-07-07 16:50:57) |

Under From ab to yz (in Word Problems) Posted on 2015-07-06 (5 Comments) |

| re: computer solution by Charlie (2015-07-06 16:11:55) |

| computer solution by Charlie (2015-07-06 15:57:15) |

Under Simultaneous Pythagorean Poser (in Just Math) Posted on 2015-07-04 (4 Comments) |

| re: solution by Charlie (2015-07-04 16:00:25) |

Under 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) |

| computer solution by Charlie (2015-07-02 15:49:37) |

Under Chinatown's problem (in Numbers) Posted on 2015-07-02 (3 Comments) |

| solution with some explanation by Charlie (2015-07-02 09:19:53) |

Under 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) |

| re(2): computer aided solution by Charlie (2015-07-02 09:09:49) |

| computer aided solution by Charlie (2015-07-01 17:00:33) |

Under Mathematical Term (in Word Problems) Posted on 2015-07-01 (4 Comments) |

| answer by Charlie (2015-07-01 10:15:27) |

Under More than linear (in Just Math) Posted on 2015-06-30 (1 Comments) |

| computer solution by Charlie (2015-06-30 16:19:44) |

Under How many subsets? (in Just Math) Posted on 2015-06-29 (3 Comments) |

| computer solution by Charlie (2015-06-29 19:43:37) |

Under 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) |

Under Factorial creates prime (in Numbers) Posted on 2015-06-26 (4 Comments) |

| Would it help if ... by Charlie (2015-06-26 11:38:46) |

Under It is not 8^5 (in Numbers) Posted on 2015-06-24 (3 Comments) |

| re: Solution (Spoiler) by Charlie (2015-06-24 09:48:19) |

Under Cubic and Factorial Puzzle (in Just Math) Posted on 2015-06-23 (1 Comments) |

| computer solution by Charlie (2015-06-23 11:39:47) |

Under 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) |

Under All possible integer determination (in Just Math) Posted on 2015-06-20 (1 Comments) |

| computer solution by Charlie (2015-06-20 14:44:33) |

Under 7 idiomatic phrases (in Word Problems) Posted on 2015-06-17 (2 Comments) |

| a start by Charlie (2015-06-17 13:55:42) |

Under One triplet out (in Numbers) Posted on 2015-06-16 (3 Comments) |

| computer solution by Charlie (2015-06-16 15:05:58) |

Under 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) |

Under On his way to fitness (in Just Math) Posted on 2015-06-15 (10 Comments) |

| 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) |

Under Bivariate Quadratic Puzzle (in Just Math) Posted on 2015-06-14 (2 Comments) |

| computer exploration gives probable solution by Charlie (2015-06-14 11:28:53) |

Under Yearly Diophantine Puzzle (in Just Math) Posted on 2015-06-12 (1 Comments) |

| computer solution by Charlie (2015-06-12 15:23:04) |

Under p^10 is special (in Numbers) Posted on 2015-06-12 (1 Comments) |

| computer solution by Charlie (2015-06-12 11:01:57) |

Under Lefties and righties (in Logic) Posted on 2015-06-10 (2 Comments) |

| solution by Charlie (2015-06-10 11:11:41) |

Under Cube root sum equality puzzle (in Just Math) Posted on 2015-06-09 (2 Comments) |

| computer solution by Charlie (2015-06-09 15:54:15) |

Under A chain of five (in Word Problems) Posted on 2015-06-08 (2 Comments) |

| computer solution by Charlie (2015-06-08 21:59:37) |

Under 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) |

Under 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) |

| computer finding by Charlie (2015-06-05 15:51:30) |

Under 5 76993 408621 (in Numbers) Posted on 2015-06-04 (3 Comments) |

| computer aided solution by Charlie (2015-06-04 14:28:11) |

Under Three Quotients and Integer Puzzle (in Just Math) Posted on 2015-06-03 (4 Comments) |

| I get (with computer program) by Charlie (2015-06-03 15:56:14) |

Under Logical, or not? (in General) Posted on 2015-06-01 (4 Comments) |

| solution by Charlie (2015-06-01 12:35:04) |

Under Just vowels (in General) Posted on 2015-05-29 (9 Comments) |

| My take on it by Charlie (2015-05-29 15:56:40) |

Under 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 by Charlie (2015-05-29 10:09:45) |

Under No neighbors allowed (in Numbers) Posted on 2015-05-22 (2 Comments) |

| solution by Charlie (2015-05-22 15:37:25) |

Under One, two, eight etc (in Numbers) Posted on 2015-05-22 (2 Comments) |

| adding overbars for large squares by Charlie (2015-05-22 13:05:09) |

| computer solution not considering overlining for large squares by Charlie (2015-05-22 10:52:38) |

Under Cuboid Concern (in Shapes) Posted on 2015-05-21 (2 Comments) |

| If I didn't make any mistakes along the way by Charlie (2015-05-21 16:16:16) |

Under Back to throne (in Probability) Posted on 2015-05-21 (3 Comments) |

| computer exploration and solution by Charlie (2015-05-21 10:34:51) |

Under Three consecutive letters (in Word Problems) Posted on 2015-05-20 (4 Comments) |

| re: Other examples by Charlie (2015-05-21 10:49:16) |

Under 3 squares and 5 ways puzzle (in Just Math) Posted on 2015-05-19 (1 Comments) |

| computer solution by Charlie (2015-05-19 15:11:37) |

Under 7G vs 7B (in General) Posted on 2015-05-18 (2 Comments) |

| No Subject by Charlie (2015-05-18 22:14:51) |

Under A sequence or not a sequence? (in Logic) Posted on 2015-05-18 (3 Comments) |

| In China and in Ancient Rome by Charlie (2015-05-18 11:14:30) |

| Of course... by Charlie (2015-05-18 09:54:09) |

Under 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: as presented and with a complication by Charlie (2015-05-15 11:01:51) |

Under Sextic Settlement (in Just Math) Posted on 2015-05-13 (6 Comments) |

| re(2): Counterexample by Charlie (2015-05-13 11:20:47) |

Under How far can you go? (in Numbers) Posted on 2015-05-12 (6 Comments) |

| computer exploration by Charlie (2015-05-12 10:26:36) |

Under Cabbageheadâ€™s neighbors (in Word Problems) Posted on 2015-05-08 (3 Comments) |

| computer findings by Charlie (2015-05-08 10:51:07) |

Under Rhyme time (in Word Problems) Posted on 2015-05-07 (6 Comments) |

| a further start by Charlie (2015-05-07 09:46:34) |

Under 4 primes (in Numbers) Posted on 2015-05-06 (3 Comments) |

| computer solution by Charlie (2015-05-06 15:40:46) |

Under Poor primes (in Numbers) Posted on 2015-05-04 (1 Comments) |

| computer solution by Charlie (2015-05-04 19:22:39) |

Under Odd men out (in Logic) Posted on 2015-04-29 (6 Comments) |

| re: Special numbers by Charlie (2015-04-30 11:00:43) |

| starting out by Charlie (2015-04-29 10:20:14) |

Under Largest palindrome (in Numbers) Posted on 2015-04-27 (4 Comments) |

| re(2): program solution by Charlie (2015-04-28 08:11:18) |

| program solution by Charlie (2015-04-27 19:23:24) |

Under Not solvable by computer (?) (in Word Problems) Posted on 2015-04-24 (5 Comments) |

| computer plus human finds only one by Charlie (2015-04-24 12:59:57) |

Under Downward Pair Reading (in Word Problems) Posted on 2015-04-24 (4 Comments) |

| re: solution(s) by Charlie (2015-04-24 21:21:09) |

| computer solution by Charlie (2015-04-24 11:04:56) |

Under Consecutive Count (in Sequences) Posted on 2015-04-23 (4 Comments) |

| revised program by Charlie (2015-04-24 21:49:59) |

| computer solution by Charlie (2015-04-23 15:29:35) |

Under 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) |

| 1,2,3,,,7,8,,10 by Charlie (2015-04-23 09:20:04) |

Under Consecutive Deletion (in Just Math) Posted on 2015-04-22 (1 Comments) |

| computer solution by Charlie (2015-04-22 14:20:58) |

Under Geographic entities (in General) Posted on 2015-04-20 (3 Comments) |

| re(2): computer assisted solution /bonus task by Charlie (2015-04-21 07:45:16) |

| computer assisted solution by Charlie (2015-04-20 15:28:27) |

Under N as a sum of factorials (in Just Math) Posted on 2015-04-20 (1 Comments) |

| solution by Charlie (2015-04-20 09:56:06) |

Under Some powers decomposed (in Numbers) Posted on 2015-04-16 (5 Comments) |

| re: Thoughts from OEIS by Charlie (2015-04-17 11:43:19) |

| computer solution: differently ordered list by Charlie (2015-04-17 07:59:36) |

Under Number Count Conclusion (in Just Math) Posted on 2015-04-15 (4 Comments) |

| computer solution by Charlie (2015-04-15 16:25:15) |

Under 2^(10n) (in Numbers) Posted on 2015-04-15 (8 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) |

| worked out by Charlie (2015-04-15 09:01:19) |

Under Integer Triangle Trial (in Shapes) Posted on 2015-04-14 (1 Comments) |

| solution by Charlie (2015-04-14 10:42:14) |

Under Non-empty sets element count (in Just Math) Posted on 2015-04-13 (5 Comments) |

| solution by Charlie (2015-04-13 14:22:49) |

Under Deux Power Divisibility (in Algorithms) Posted on 2015-04-12 (3 Comments) |

| continuation of Jer's table by Charlie (2015-04-12 13:27:24) |

Under Long chain (in Numbers) Posted on 2015-04-10 (7 Comments) |

| lesson learned by Charlie (2015-04-11 08:32:42) |

| computer exploration by Charlie (2015-04-10 20:46:20) |

Under From product to town (in Word Problems) Posted on 2015-04-10 (2 Comments) |

| computer assisted solution by Charlie (2015-04-10 11:07:50) |

Under 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) |

Under Some sums (in Numbers) Posted on 2015-04-07 (3 Comments) |

| computer solution by Charlie (2015-04-07 14:34:22) |

Under Buddy, can you spare a buck? (in Numbers) Posted on 2015-04-03 (3 Comments) |

| Hmmm... by Charlie (2015-04-03 10:13:26) |

Under Domain and Range (in Just Math) Posted on 2015-04-02 (1 Comments) |

| Somewhat satisfying answer by Charlie (2015-04-02 14:13:46) |

Under The Case of the Mixtup Calendar (in General) Posted on 2015-04-02 (1 Comments) |

| I think.... by Charlie (2015-04-02 10:00:39) |

Under Reflection Matrix (in Just Math) Posted on 2015-04-01 (3 Comments) |

| completing the derivation by Charlie (2015-04-02 08:50:32) |

| researched solution by Charlie (2015-04-01 16:10:17) |

Under Function Function Function Function Foray (in Just Math) Posted on 2015-03-31 (2 Comments) |

| computer solution to both parts; analytic solution for part 2 by Charlie (2015-03-31 14:43:39) |

Under Nine times SSD (in Just Math) Posted on 2015-03-30 (1 Comments) |

| computer solution by Charlie (2015-03-30 22:04:20) |

Under How many solutions? (in Just Math) Posted on 2015-03-30 (1 Comments) |

| solution by Charlie (2015-03-30 09:12:24) |

Under Neighboring tickets (in Numbers) Posted on 2015-03-26 (2 Comments) |

| computer solution by Charlie (2015-03-26 15:21:20) |

Under Island Adventure (in Liars and Knights) Posted on 2015-03-26 (1 Comments) |

| solution by Charlie (2015-03-26 10:02:29) |

Under Zero Sum Expression (in Just Math) Posted on 2015-03-25 (2 Comments) |

| computer exploration by Charlie (2015-03-25 15:44:18) |

Under Win some, lose some II (in Just Math) Posted on 2015-03-25 (1 Comments) |

| solution by Charlie (2015-03-25 08:41:08) |

Under Long list (in Word Problems) Posted on 2015-03-24 (2 Comments) |

| a computer list by Charlie (2015-03-24 15:28:03) |

Under 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) |

Under Rectangular Rearrangement Resolution (in Shapes) Posted on 2015-03-20 (5 Comments) |

| further by Charlie (2015-03-20 11:00:28) |

Under 123456789 scrambled (in Numbers) Posted on 2015-03-19 (6 Comments) |

| re(3): computer solution by Charlie (2015-03-20 07:49:52) |

| computer solution by Charlie (2015-03-19 15:29:27) |

Under Isosceles Crease (in Shapes) Posted on 2015-03-19 (2 Comments) |

| solution by Charlie (2015-03-19 11:28:48) |

Under +Q-U : Quite Unusual (in Word Problems) Posted on 2015-03-17 (2 Comments) |

| list by Charlie (2015-03-17 15:21:53) |

Under 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 by Charlie (2015-03-17 09:56:07) |

Under Pentagon Fraction Minimizing (in Just Math) Posted on 2015-03-16 (2 Comments) |

| solution by Charlie (2015-03-16 13:16:19) |

Under Musical Term - Not (in Word Problems) Posted on 2015-03-16 (2 Comments) |

| re: full solution........................SPOILER by Charlie (2015-03-16 10:06:02) |

Under Linear and Quadratic Square (in Just Math) Posted on 2015-03-15 (4 Comments) |

| computer solution by Charlie (2015-03-15 12:52:08) |

Under Five Cards III (in Logic) Posted on 2015-03-13 (3 Comments) |

| computer solution by Charlie (2015-03-13 15:42:15) |

Under 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) |

Under Deux Digit Deduction II (in Just Math) Posted on 2015-03-12 (4 Comments) |

| last two digits in base 12 by Charlie (2015-03-12 10:56:05) |

Under 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) |

| with the assistance of a computer language that can handle complex intermediate terms by Charlie (2015-03-10 14:21:27) |

Under 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 by Charlie (2015-03-09 17:39:29) |

Under 3 sets of primes (in Numbers) Posted on 2015-03-08 (1 Comments) |

| computer solution by Charlie (2015-03-08 12:53:52) |

Under Divisor Count Conclusion (in Just Math) Posted on 2015-03-06 (2 Comments) |

| re: solution -- same answer, a different way by Charlie (2015-03-06 10:39:41) |

Under Painting high dimension cubes (in Shapes) Posted on 2015-03-05 (4 Comments) |

| re: Thoughts by Charlie (2015-03-14 07:52:06) |

| solution by Charlie (2015-03-05 15:41:41) |

Under Find the last member (in Sequences) Posted on 2015-03-05 (1 Comments) |

| computer solution by Charlie (2015-03-05 10:48:21) |

Under 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) |

Under 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) |

| computer solution by Charlie (2015-03-04 09:33:20) |

Under Contradict Goldbach (in Numbers) Posted on 2015-03-03 (2 Comments) |

| computer assisted solution by Charlie (2015-03-03 13:24:17) |

Under 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) |

Under Rearranged Resolution II (in Word Problems) Posted on 2015-03-02 (4 Comments) |

| re: computer solutions by Charlie (2015-03-02 14:09:24) |

| computer solutions by Charlie (2015-03-02 14:05:05) |

Under 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) |

| computer solutions by Charlie (2015-02-26 12:07:52) |

Under Next year vs the current year (in Numbers) Posted on 2015-02-25 (5 Comments) |

| with some computer assistance by Charlie (2015-02-25 10:50:12) |

Under Composite prime (in Numbers) Posted on 2015-02-24 (2 Comments) |

| smallest and beyond--computer exploration (spoiler) by Charlie (2015-02-24 11:11:57) |

Under Be consistent (in Numbers) Posted on 2015-02-20 (3 Comments) |

| first thoughts by Charlie (2015-02-20 13:15:07) |

Under Not too much (in Numbers) Posted on 2015-02-20 (8 Comments) |

| re(2): Is this valid? no ! - partial spoiler by Charlie (2015-02-20 15:16:45) |

Under Double a triangle (in Sequences) Posted on 2015-02-19 (3 Comments) |

| The first few pairs by Charlie (2015-02-19 14:07:43) |

Under Repeated Words (in Word Problems) Posted on 2015-02-19 (4 Comments) |

| re: Could it be . . .? (spoiler added) by Charlie (2015-02-19 10:49:46) |

Under A modified die (in Numbers) Posted on 2015-02-18 (3 Comments) |

| computer solution by Charlie (2015-02-18 14:07:55) |

Under The final quantity (in Numbers) Posted on 2015-02-18 (4 Comments) |

| computer solution by Charlie (2015-02-18 10:27:51) |

Under Approximating radicals (in Numbers) Posted on 2015-02-17 (4 Comments) |

| discussion by Charlie (2015-02-17 16:31:49) |

Under z is a word (in Word Problems) Posted on 2015-02-17 (1 Comments) |

| solution by Charlie (2015-02-17 11:18:27) |

Under Golfer Gauge (in Word Problems) Posted on 2015-02-16 (4 Comments) |

| (ii) by Charlie (2015-02-16 15:25:52) |

Under Phrase a question I (in Numbers) Posted on 2015-02-16 (2 Comments) |

| computer solutions by Charlie (2015-02-16 09:19:51) |

Under Distinct Values Derivation (in General) Posted on 2015-02-15 (2 Comments) |

| re: computer solution -- what was I thinking? by Charlie (2015-02-18 19:43:50) |

| computer solution by Charlie (2015-02-15 14:18:04) |

Under An ancient Egyptian problem (in Just Math) Posted on 2015-02-13 (5 Comments) |

| computer solutions by Charlie (2015-02-13 15:20:11) |

Under Bound the product (in Numbers) Posted on 2015-02-13 (4 Comments) |

| Some facts that may aid in finding a proof by Charlie (2015-02-13 10:49:00) |

Under Date Deduction II (in General) Posted on 2015-02-12 (1 Comments) |

| solution by Charlie (2015-02-12 15:59:49) |

Under Inequality (in Just Math) Posted on 2015-02-11 (5 Comments) |

| re: Trigonometric solution by Charlie (2015-02-12 08:57:31) |

| graphic solution by Charlie (2015-02-11 10:39:34) |

Under Shared by squares (in Algorithms) Posted on 2015-02-10 (3 Comments) |

| re: A start by Charlie (2015-02-10 19:44:38) |

| some thoughts by Charlie (2015-02-10 19:26:46) |

Under Total Triplet Treat (in Shapes) Posted on 2015-02-09 (1 Comments) |

| computer solution by Charlie (2015-02-09 14:40:57) |

Under A simple gematria (in Numbers) Posted on 2015-02-09 (3 Comments) |

| a few proper names by Charlie (2015-02-09 11:35:24) |

Under The LSD of Prime Numbers (in Numbers) Posted on 2015-02-08 (1 Comments) |

| computer solution by Charlie (2015-02-08 16:15:06) |

Under Very very colourful (in General) Posted on 2015-02-06 (2 Comments) |

| 5 through 8 by Charlie (2015-02-06 10:19:18) |

Under Rooting for Roots (in Just Math) Posted on 2015-02-04 (2 Comments) |

| solution by Charlie (2015-02-04 15:25:24) |

Under Mr Mar & Mrs Bles (in Numbers) Posted on 2015-02-04 (1 Comments) |

| solution by Charlie (2015-02-04 11:04:05) |

Under Palindromes from Digit Sum Series (in Numbers) Posted on 2015-02-03 (1 Comments) |

| open ended solution/discussion by Charlie (2015-02-03 14:31:41) |

Under Happy Numbers (in Numbers) Posted on 2015-02-02 (1 Comments) |

| computer solution by Charlie (2015-02-02 15:29:50) |

Under Ellis Number (in Numbers) Posted on 2015-01-31 (1 Comments) |

| computer solution by Charlie (2015-01-31 14:53:59) |

Under Find From Floor (in Just Math) Posted on 2015-01-30 (4 Comments) |

| solution by Charlie (2015-01-30 14:36:09) |

Under Integer Triplets with a Difference (in Numbers) Posted on 2015-01-30 (6 Comments) |

| computer solution by Charlie (2015-01-30 10:31:52) |

Under A Self-Terminating Sequence (in Numbers) Posted on 2015-01-29 (1 Comments) |

| computer solution by Charlie (2015-01-29 14:41:58) |

Under Date Count Conclusion (in General) Posted on 2015-01-29 (1 Comments) |

| computer solution (spoiler) by Charlie (2015-01-29 09:50:44) |

Under Phrase Anagram Ponder (in Word Problems) Posted on 2015-01-28 (3 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) |

Under 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) |

| computer solution by Charlie (2015-01-28 11:19:45) |

Under 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 computer findings by Charlie (2015-01-27 15:41:41) |

Under Integral Proof (in Numbers) Posted on 2015-01-26 (3 Comments) |

| no proof, but the integer is... (spoiler) by Charlie (2015-01-26 13:24:51) |

Under Deux Difference Deduction (in Sequences) Posted on 2015-01-23 (8 Comments) |

| computer solution by Charlie (2015-01-23 15:20:44) |

Under What price glory? (in Games) Posted on 2015-01-22 (5 Comments) |

| If there isn't an even better strategy... (spoiler?) by Charlie (2015-01-22 11:13:59) |

Under Deux Digit Deduction (in Just Math) Posted on 2015-01-21 (2 Comments) |

| computer solution -- last 6 digits of each by Charlie (2015-01-21 12:52:16) |

Under Not hehe (in Word Problems) Posted on 2015-01-21 (5 Comments) |

| probably not one of the two by Charlie (2015-01-21 10:04:33) |

Under 4 clues (in Numbers) Posted on 2015-01-19 (3 Comments) |

| computer solution by Charlie (2015-01-19 11:47:55) |

Under Chinese New Year (in General) Posted on 2015-01-16 (8 Comments) |

| re: computer solution by Charlie (2015-01-19 07:48:02) |

| 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) |

| computer solution by Charlie (2015-01-16 20:30:14) |

| testing by Charlie (2015-01-16 15:16:05) |

Under 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) |

Under Paramount Polygon Poser (in Shapes) Posted on 2015-01-15 (3 Comments) |

| computer assisted solution by Charlie (2015-01-15 10:14:13) |

Under Three conditions define a triplet (in Just Math) Posted on 2015-01-14 (2 Comments) |

| computer solution by Charlie (2015-01-14 22:24:18) |

Under Square Sum Settlement (in Just Math) Posted on 2015-01-14 (3 Comments) |

| computer solution (spoiler) by Charlie (2015-01-14 10:47:33) |

Under Celsius Fahrenheit Check (in Just Math) Posted on 2015-01-13 (1 Comments) |

| not taking up the extra challenge--(spoiler) by Charlie (2015-01-13 14:38:01) |

Under Find the remainder (in Just Math) Posted on 2015-01-09 (3 Comments) |

| re: possible solution (spoiler) -- computer confirmation by Charlie (2015-01-09 10:45:34) |

Under Units Digit Determination (in Just Math) Posted on 2015-01-07 (3 Comments) |

| corrected computer summation by Charlie (2015-01-08 07:59:42) |

| Adding up those 9-digit numbers by Charlie (2015-01-07 15:12:43) |

Under Cows and buffaloes. (in Just Math) Posted on 2015-01-07 (2 Comments) |

| computer solution by Charlie (2015-01-07 10:30:39) |

Under More than a million, less than ten (in Just Math) Posted on 2015-01-06 (4 Comments) |

| re(2): More than 3000, less than 8, computer solutions by Charlie (2015-01-09 08:29:13) |

| More than 3000, less than 8, computer solutions by Charlie (2015-01-06 09:30:05) |

Under 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) |

| computer-aided solution by Charlie (2015-01-05 15:54:59) |

Under Sum Productive Digits (in Just Math) Posted on 2014-12-31 (2 Comments) |

| computer solutions by Charlie (2014-12-31 12:14:30) |

Under A simple inequality (in Just Math) Posted on 2014-12-31 (4 Comments) |

| no proof--just demonstration by Charlie (2014-12-31 11:08:03) |

Under Binomial Baffle (in Just Math) Posted on 2014-12-30 (2 Comments) |

| computer solution by Charlie (2014-12-30 14:35:48) |

Under Neither is prime (in Just Math) Posted on 2014-12-30 (2 Comments) |

| 10101 by Charlie (2014-12-30 10:55:15) |

Under Reverse Role II (in Just Math) Posted on 2014-12-29 (2 Comments) |

| computer solution by Charlie (2014-12-29 09:56:16) |

Under 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) |

Under Three Digit Travail (in Probability) Posted on 2014-12-26 (1 Comments) |

| computer solution by Charlie (2014-12-26 14:58:12) |

Under 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) |

| computer solution by Charlie (2014-12-25 14:01:32) |

Under Pie Pieces (in Just Math) Posted on 2014-12-24 (2 Comments) |

| solutions by 2 methods, computer aided by Charlie (2014-12-24 14:00:42) |

Under Omega to Alpha Observation (in Just Math) Posted on 2014-12-23 (5 Comments) |

| computer solutions by Charlie (2014-12-23 15:09:46) |

Under 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) |

Under 2014 Prime Treat (in Probability) Posted on 2014-12-22 (1 Comments) |

| computer solution and exploration by Charlie (2014-12-22 15:52:52) |

Under LCM 540 (in Just Math) Posted on 2014-12-22 (6 Comments) |

| re: No Subject by Charlie (2014-12-22 12:31:37) |

Under Divisible by 28 (in Just Math) Posted on 2014-12-21 (4 Comments) |

| computer solution by Charlie (2014-12-21 21:08:21) |

Under Arithmetic Numbers Enumeration (in Sequences) Posted on 2014-12-19 (2 Comments) |

| computer solution by Charlie (2014-12-19 15:29:55) |

Under Origamic Revisited (in Shapes) Posted on 2014-12-19 (1 Comments) |

| playing with GSP by Charlie (2014-12-19 10:49:33) |

Under Compare sizes (in Just Math) Posted on 2014-12-18 (3 Comments) |

| computer solution by Charlie (2014-12-18 20:24:15) |

Under m & n (in Just Math) Posted on 2014-12-18 (2 Comments) |

| computer-aided solution by Charlie (2014-12-18 09:53:58) |

Under Floor Fulfilment (in Just Math) Posted on 2014-12-17 (2 Comments) |

| computer evaluation by Charlie (2014-12-17 13:44:55) |

Under Power Sum Poser (in Just Math) Posted on 2014-12-16 (2 Comments) |

| computer solution by Charlie (2014-12-16 15:22:16) |

Under Cash and chit (in General) Posted on 2014-12-15 (1 Comments) |

| computer solution by Charlie (2014-12-15 13:47:25) |

Under Cube Difference Deduction (in Just Math) Posted on 2014-12-12 (2 Comments) |

| computer solution by Charlie (2014-12-12 17:48:48) |

Under Trigo inequality (in Just Math) Posted on 2014-12-11 (11 Comments) |

| 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) |

| re: solution by Charlie (2014-12-13 08:07:18) |

| re: solution by Charlie (2014-12-12 07:45:30) |

Under Year Yearn 2 (in General) Posted on 2014-12-11 (4 Comments) |

| between 1000 and 3000 -- computer solution by Charlie (2014-12-11 08:48:22) |

Under Eight distances (in Just Math) Posted on 2014-12-10 (4 Comments) |

| can't be sure by Charlie (2014-12-10 10:12:45) |

Under Distinct sod (in Just Math) Posted on 2014-12-09 (1 Comments) |

| computer solution by Charlie (2014-12-09 11:23:28) |

Under Out of this word (in Word Problems) Posted on 2014-12-08 (9 Comments) |

| Most of a solution by Charlie (2014-12-08 10:26:15) |

Under Two squares in a circle (in Geometry) Posted on 2014-12-05 (4 Comments) |

| solution by Charlie (2014-12-05 15:20:18) |

Under 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: computer used, to avoid tedium by Charlie (2014-12-05 09:40:23) |

Under So close, but no closer... (in Just Math) Posted on 2014-12-04 (5 Comments) |

| computer assisted solution by Charlie (2014-12-04 14:21:37) |

Under Test #7 (in Word Problems) Posted on 2014-12-03 (7 Comments) |

| computer solution by Charlie (2014-12-03 14:01:05) |

Under Sibling Birthday Baffle (in Logic) Posted on 2014-12-03 (1 Comments) |

| answer by Charlie (2014-12-03 11:28:39) |

Under Floor Equation (in Just Math) Posted on 2014-12-02 (2 Comments) |

| solution by Charlie (2014-12-02 14:02:29) |

Under Consecutive Placement - Not (in Probability) Posted on 2014-12-01 (1 Comments) |

| computer assisted solution by Charlie (2014-12-01 16:23:18) |

Under What not? (in General) Posted on 2014-12-01 (4 Comments) |

| re(2): My solution (spoiler?) by Charlie (2014-12-02 22:06:55) |

| My solution (spoiler?) by Charlie (2014-12-01 08:41:05) |

Under Seven Age Settlement (in Logic) Posted on 2014-11-24 (4 Comments) |

| No Subject by Charlie (2014-11-24 14:59:19) |

Under To a fifth of the wind, that pierces us most (in Famous Riddles) Posted on 2014-11-21 (1 Comments) |

| Hints by Charlie (2014-11-21 12:24:00) |

Under 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) |

| The easy solution by Charlie (2014-11-19 08:40:36) |

Under Real Resolution II (in Just Math) Posted on 2014-11-18 (1 Comments) |

| solution by Charlie (2014-11-18 14:36:03) |

Under Missions impossible (in Just Math) Posted on 2014-11-17 (3 Comments) |

| solution by Charlie (2014-11-17 19:16:26) |

Under Well said (in General) Posted on 2014-11-17 (2 Comments) |

| re: Decrypting the quote (spoiler) by Charlie (2014-11-17 12:48:13) |

Under Inconsiderable Integer Illation (in Just Math) Posted on 2014-11-16 (10 Comments) |

| re: answer only by Charlie (2014-11-16 14:55:12) |

| Actual answer -- calculator solution by Charlie (2014-11-16 14:50:58) |

Under 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 examples from the computer by Charlie (2014-11-14 14:21:21) |

Under 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) |

| computer solution by Charlie (2014-11-13 14:24:33) |

Under Survival Surmise (in Logic) Posted on 2014-11-12 (2 Comments) |

| solution by Charlie (2014-11-12 15:27:36) |

Under Hours of Operation (in Numbers) Posted on 2014-11-12 (8 Comments) |

| Longest for 12-hour clock: computer solution by Charlie (2014-11-13 08:15:01) |

| re: Longest duration, 24 hour clock (spoiler) by Charlie (2014-11-13 08:07:14) |

Under Austria or Italy ? (in Just Math) Posted on 2014-11-11 (1 Comments) |

| computer solution by Charlie (2014-11-11 15:44:30) |

Under Composite Sum Satisfaction (in Just Math) Posted on 2014-11-11 (4 Comments) |

| computer solution by Charlie (2014-11-11 10:34:13) |

Under Arrival Appraisal (in Science) Posted on 2014-11-07 (2 Comments) |

| different solution by Charlie (2014-11-07 20:45:06) |

Under Philately Ponder (in Logic) Posted on 2014-11-07 (3 Comments) |

| solution by Charlie (2014-11-07 10:11:36) |

Under Supreme Red Sox Surmise (in Probability) Posted on 2014-11-06 (2 Comments) |

| computer solution by Charlie (2014-11-06 11:05:58) |

Under Box Volume Baffle (in Shapes) Posted on 2014-11-05 (5 Comments) |

| re(2): No Subject by Charlie (2014-11-06 14:43:23) |

| No Subject by Charlie (2014-11-06 08:19:07) |

Under RMS Rigor (in Just Math) Posted on 2014-11-04 (4 Comments) |

| computer check of all a from 1 to a million (spoiler) by Charlie (2014-11-04 20:32:00) |

Under Square Choice Conclusion (in Probability) Posted on 2014-11-04 (2 Comments) |

| solution (spoiler) by Charlie (2014-11-04 08:33:07) |

Under Win some, lose some (in Logic) Posted on 2014-11-03 (1 Comments) |

| discussion by Charlie (2014-11-03 15:57:12) |

Under Fridays (in Numbers) Posted on 2014-11-03 (1 Comments) |

| computer solution by Charlie (2014-11-03 10:54:22) |

Under Quadrilateral Quandary (in Shapes) Posted on 2014-11-02 (1 Comments) |

| Geometers' Sketchpad approximations by Charlie (2014-11-02 22:26:15) |

Under Chairs galore (in Just Math) Posted on 2014-10-31 (4 Comments) |

| solution and discussion by Charlie (2014-10-31 10:19:44) |

Under Identical Digit Baffle II (in Just Math) Posted on 2014-10-30 (2 Comments) |

| solution and also those in the middle by Charlie (2014-10-30 14:35:46) |

Under Reply to this (in Just Math) Posted on 2014-10-30 (3 Comments) |

| solution by Charlie (2014-10-30 12:06:57) |

Under Random^Random (in Probability) Posted on 2014-10-29 (9 Comments) |

| 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) |

| table of numeric integration by Charlie (2014-10-29 15:41:37) |

| re: towards an analytic solution - numeric integration by Charlie (2014-10-29 15:32:44) |

| towards an analytic solution by Charlie (2014-10-29 14:35:18) |

| numerical simulation by Charlie (2014-10-29 13:54:25) |

Under Analyzing change (in Just Math) Posted on 2014-10-28 (4 Comments) |

| computer solution by Charlie (2014-10-28 12:22:14) |

Under Hat #9 (in Word Problems) Posted on 2014-10-27 (2 Comments) |

| uncommented computer output by Charlie (2014-10-27 19:15:56) |

Under Word Containment Contemplation (in Word Problems) Posted on 2014-10-27 (3 Comments) |

| re: No Subject by Charlie (2014-10-27 14:21:23) |

Under Uncommonly Common (in Riddles) Posted on 2014-10-25 (4 Comments) |

| one possibility by Charlie (2014-10-26 08:34:42) |

Under Performance Probe (in Logic) Posted on 2014-10-24 (2 Comments) |

| computer solution by Charlie (2014-10-24 19:28:50) |

Under Curious concatenations (in Numbers) Posted on 2014-10-23 (1 Comments) |

| computer solutions by Charlie (2014-10-23 16:07:43) |

Under 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) |

| computer solutions by Charlie (2014-10-23 10:21:55) |

| 10-min p&p based on a misinterpretation -- not a solution by Charlie (2014-10-23 09:38:17) |

Under Beaujolais Nouveau Day (in Probability) Posted on 2014-10-22 (7 Comments) |

| computer solution by Charlie (2014-10-22 16:12:59) |

Under One by two (in Numbers) Posted on 2014-10-22 (6 Comments) |

| re: 19 solutions by Charlie (2014-10-22 11:17:13) |

Under Distinct Decimal Digits (in Numbers) Posted on 2014-10-21 (1 Comments) |

| computer solutions by Charlie (2014-10-21 15:30:43) |

Under Farmer Giles (in Just Math) Posted on 2014-10-21 (4 Comments) |

| re(2): solutions by Charlie (2014-10-22 07:45:10) |

| solutions by Charlie (2014-10-21 10:36:47) |

Under Cuisine Conclusion II (in Word Problems) Posted on 2014-10-20 (5 Comments) |

| computer-aided method by Charlie (2014-10-20 15:49:41) |

Under Half odd, half even (in Numbers) Posted on 2014-10-16 (3 Comments) |

| re: Answer by Charlie (2014-10-16 15:23:55) |

| computer solution by Charlie (2014-10-16 15:07:00) |

Under Distinct Values Validation (in Just Math) Posted on 2014-10-16 (7 Comments) |

| re: Alternative formulation, x+y+z <= 94 by Charlie (2014-10-16 14:59:55) |

| Alternative formulation, while it had been in the queue by Charlie (2014-10-16 10:52:31) |

| solution by Charlie (2014-10-16 10:39:49) |

Under 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) |

Under My products (in General) Posted on 2014-10-15 (2 Comments) |

| computer solution (spoiler) by Charlie (2014-10-15 10:28:44) |

Under Ternary Sum Travail (in Probability) Posted on 2014-10-14 (2 Comments) |

| computer solution by Charlie (2014-10-14 14:55:57) |

Under Dozen Word Amalgamation (in Word Problems) Posted on 2014-10-13 (2 Comments) |

| Learned a new word (spoiler) by Charlie (2014-10-13 15:21:06) |

Under 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) |

| Bonus only--not the actual puzzle. by Charlie (2014-10-13 08:57:02) |

Under Greatest GCD (in Sequences) Posted on 2014-10-12 (5 Comments) |

| computer exploration by Charlie (2014-10-12 14:17:06) |

Under Cryptajoke II (in Cryptography) Posted on 2014-10-11 (3 Comments) |

| thoughts by Charlie (2014-10-12 10:39:32) |

Under Arithmetic and Geometric Addle (in Sequences) Posted on 2014-10-10 (3 Comments) |

| computer solution by Charlie (2014-10-10 14:55:13) |

Under Optimal location (in Just Math) Posted on 2014-10-10 (2 Comments) |

| solution (spoiler) by Charlie (2014-10-10 10:06:24) |

Under A happy trio (in Probability) Posted on 2014-10-09 (3 Comments) |

| A better approximation by Charlie (2014-10-09 13:48:49) |

Under 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) |

| re(2): Solution or partial solution ... clarification by Charlie (2014-10-09 09:56:20) |

Under Counting Crossings (in Geometry) Posted on 2014-10-08 (7 Comments) |

| wording by Charlie (2014-10-09 07:51:57) |

| solution by Charlie (2014-10-08 13:12:45) |

Under Zeroless or not? (in Probability) Posted on 2014-10-07 (1 Comments) |

| computer exploration by Charlie (2014-10-07 10:35:23) |

Under 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) |

| re: computer aided solution -- whoops!; 50 is not under 46 by Charlie (2014-10-06 14:23:44) |

| computer aided solution by Charlie (2014-10-06 14:19:08) |

Under Inverse Power Pact (in Just Math) Posted on 2014-10-02 (2 Comments) |

| The computer solution by Charlie (2014-10-02 10:47:53) |

Under Why and when (in General) Posted on 2014-10-01 (1 Comments) |

| computer aided solution by Charlie (2014-10-01 15:51:47) |

Under 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) |

| Unsatisfying computer proof by Charlie (2014-10-01 11:21:11) |

Under Consecutive Conclusion (in Just Math) Posted on 2014-09-30 (8 Comments) |

| re(2): two computer algorithm solutions by Charlie (2014-10-01 07:41:24) |

| two computer algorithm solutions by Charlie (2014-09-30 18:40:42) |

Under 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) |

| Technical solution--but a larger question remains. by Charlie (2014-09-28 09:04:20) |

Under Simultaneous Satisfaction (in Just Math) Posted on 2014-09-27 (2 Comments) |

| computer solution and outline of a possible analytic method by Charlie (2014-09-27 15:17:56) |

Under Cubic Minimum (in Just Math) Posted on 2014-09-26 (7 Comments) |

| computer solution by Charlie (2014-09-26 13:50:49) |

| re: ANSWER by Charlie (2014-09-26 13:47:41) |

Under Only one basic solution II (in General) Posted on 2014-09-26 (1 Comments) |

| computer assisted solution by Charlie (2014-09-26 10:30:55) |

Under Moving target (in Shapes) Posted on 2014-09-25 (2 Comments) |

| solution by Charlie (2014-09-25 19:13:59) |

Under Mary, Mary, Quite Orderly (in Just Math) Posted on 2014-09-24 (6 Comments) |

| Part (ii) at last (?) by Charlie (2014-09-26 14:44:57) |

| re(4): solution -- second thoughts on correction by Charlie (2014-09-25 09:53:12) |

| 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 by Charlie (2014-09-24 16:00:59) |

Under Rectangle Color Rigor (in Just Math) Posted on 2014-09-23 (4 Comments) |

| a diagram by Charlie (2014-09-23 12:37:28) |

Under Cinq Digit Choice (in Probability) Posted on 2014-09-22 (1 Comments) |

| computer solution (spoiler) by Charlie (2014-09-22 16:29:18) |

Under Max and Min (in Just Math) Posted on 2014-09-22 (3 Comments) |

| computer solution by Charlie (2014-09-22 12:22:25) |

Under Cuisine Conclusion (in Cryptography) Posted on 2014-09-18 (1 Comments) |

| solution (spoiler): middle four enough to answer the question by Charlie (2014-09-18 10:34:24) |

Under Simultaneous Base Baffle (in Just Math) Posted on 2014-09-17 (6 Comments) |

| 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) |

Under Adding to rolls (in Probability) Posted on 2014-09-15 (1 Comments) |

| solution by Charlie (2014-09-15 18:05:27) |

Under n-dimensional spheres (in Just Math) Posted on 2014-09-15 (2 Comments) |

| The sequence, if my trig is right by Charlie (2014-09-15 08:26:49) |

Under 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) |

| computer solution by Charlie (2014-09-12 13:24:44) |

Under Roy G Biv (in Probability) Posted on 2014-09-11 (1 Comments) |

| computer solution by Charlie (2014-09-11 16:36:33) |

Under Digital Time (in General) Posted on 2014-09-10 (1 Comments) |

| computer solution and analysis by Charlie (2014-09-10 12:07:42) |

Under Rooted to the Floor II (in Just Math) Posted on 2014-09-08 (3 Comments) |

| computer solution by Charlie (2014-09-08 17:28:37) |

Under Identical Digit Baffle (in Just Math) Posted on 2014-09-08 (2 Comments) |

| computer solution by Charlie (2014-09-08 11:07:11) |

Under 2 pandigital equations (in Numbers) Posted on 2014-09-05 (4 Comments) |

| computer solution by Charlie (2014-09-05 18:14:59) |

Under Distinct Delivery Deduction (in Just Math) Posted on 2014-09-04 (7 Comments) |

| a computer solution by Charlie (2014-09-04 17:33:37) |

Under 2015 digits (in Just Math) Posted on 2014-09-04 (2 Comments) |

| solution by Charlie (2014-09-04 11:22:35) |

Under Sparse Sine Settlement (in Just Math) Posted on 2014-09-03 (2 Comments) |

| computer-aided solution by Charlie (2014-09-03 18:03:11) |

Under Decimal Digits (in General) Posted on 2014-09-02 (5 Comments) |

| thoughts on (a) by Charlie (2014-09-02 14:10:31) |

Under World War I sword (in Riddles) Posted on 2014-09-02 (1 Comments) |

| spoiler by Charlie (2014-09-02 14:02:29) |

Under Cuboid Diagonal Conclusion (in Shapes) Posted on 2014-09-01 (4 Comments) |

| re: solution by Charlie (2014-09-01 21:54:16) |

| solution by Charlie (2014-09-01 17:55:48) |

Under Hi there, Pascal (in Numbers) Posted on 2014-09-01 (2 Comments) |

| computer solution by Charlie (2014-09-01 12:36:58) |

Under Test #5 (in Word Problems) Posted on 2014-08-31 (1 Comments) |

| computer findings by Charlie (2014-08-31 13:13:28) |

Under Triangular Triangulation (in Just Math) Posted on 2014-08-30 (4 Comments) |

| They do seem to keep on coming -- no proof either way by Charlie (2014-08-30 14:46:28) |

Under Playing With Marbles II (in Probability) Posted on 2014-08-29 (2 Comments) |

| simulation verification by Charlie (2014-08-29 12:16:17) |

| solution by Charlie (2014-08-29 11:39:58) |

Under Segment Section Settlement (in Probability) Posted on 2014-08-28 (3 Comments) |

| solution and verification by Charlie (2014-08-28 12:44:27) |

Under Tetrahedra Trial (in Shapes) Posted on 2014-08-27 (1 Comments) |

| solution by Charlie (2014-08-27 19:39:03) |

Under Concavity (in Calculus) Posted on 2014-08-26 (2 Comments) |

| observation by Charlie (2014-08-26 17:19:21) |

Under One up (in Probability) Posted on 2014-08-22 (1 Comments) |

| With computer assistance by Charlie (2014-08-22 12:33:30) |

Under Three tasks (in Just Math) Posted on 2014-08-21 (3 Comments) |

| computer solutions by Charlie (2014-08-21 16:53:45) |

Under Grandma's age (in Just Math) Posted on 2014-08-20 (8 Comments) |

| I must be missing something by Charlie (2014-08-20 16:20:37) |

Under Square Cut (in Shapes) Posted on 2014-08-20 (2 Comments) |

| exploded by Charlie (2014-08-20 12:58:18) |

Under Pandigital Ponder II (in Just Math) Posted on 2014-08-19 (3 Comments) |

| computer solution by Charlie (2014-08-19 18:18:00) |

Under Test #4 (in General) Posted on 2014-08-19 (1 Comments) |

| computer solution by Charlie (2014-08-19 12:20:04) |

Under Quaint Quadruplets (in Just Math) Posted on 2014-08-18 (3 Comments) |

| re: software solution--similar puzzle solution by Charlie (2014-08-19 10:03:12) |

| software solution by Charlie (2014-08-18 20:58:28) |

Under Crossnumber IV (in General) Posted on 2014-08-18 (3 Comments) |

| attempt without leading zeroes by Charlie (2014-08-18 12:24:28) |

Under Three subsets (in Just Math) Posted on 2014-08-15 (13 Comments) |

| 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) |

Under Cutting corners. (in Shapes) Posted on 2014-08-14 (5 Comments) |

| re(2): what is wanted? by Charlie (2014-08-15 10:07:19) |

| re: what is wanted? by Charlie (2014-08-14 16:41:17) |

| what is wanted? by Charlie (2014-08-14 16:34:12) |

Under Pandigital Ponder (in Just Math) Posted on 2014-08-13 (1 Comments) |

| computer solutions by Charlie (2014-08-13 15:50:53) |

Under Some Triangles Sum 2014 (in Just Math) Posted on 2014-08-12 (5 Comments) |

| re: Possible Solution by Charlie (2014-08-12 17:24:03) |

| computer solution by Charlie (2014-08-12 17:10:24) |

Under Octahedron Vertex Ponder (in Probability) Posted on 2014-08-12 (1 Comments) |

| computer solution by Charlie (2014-08-12 11:41:39) |

Under Fraction Sum Satisfaction (in Just Math) Posted on 2014-08-09 (3 Comments) |

| computer solutions by Charlie (2014-08-09 13:16:49) |

| re: 5 answers by Charlie (2014-08-09 13:14:38) |

Under Guessing ages (in Tricks) Posted on 2014-08-08 (2 Comments) |

| solution by Charlie (2014-08-08 13:14:29) |

Under Pair Ponder (in Probability) Posted on 2014-08-07 (2 Comments) |

| simulation verification by Charlie (2014-08-07 13:29:43) |

| solution by Charlie (2014-08-07 12:22:36) |

Under Find a Frenzy Fibo (in Numbers) Posted on 2014-08-06 (2 Comments) |

| For a similar problem by Charlie (2014-08-06 11:22:46) |

Under Done? No need? ...UNDO! (in Word Problems) Posted on 2014-08-05 (4 Comments) |

| computer solution -- no definitions by Charlie (2014-08-05 13:29:27) |

Under Test #2 (in General) Posted on 2014-08-04 (1 Comments) |

| computer solution by Charlie (2014-08-04 17:43:24) |

Under Palindrome Ponder (in Just Math) Posted on 2014-08-04 (1 Comments) |

| solution by Charlie (2014-08-04 13:09:37) |

Under Sixes and Sevens (in Just Math) Posted on 2014-08-02 (4 Comments) |

| computer solution by Charlie (2014-08-02 14:26:11) |

Under Log Divisor Sum (in Just Math) Posted on 2014-08-01 (2 Comments) |

| computer solution by Charlie (2014-08-01 12:36:02) |

Under Easy count (in Just Math) Posted on 2014-07-29 (5 Comments) |

| re: Solution by Charlie (2014-07-30 09:57:26) |

| computer assisted solution by Charlie (2014-07-29 14:38:40) |

Under Test #1 (in Numbers) Posted on 2014-07-29 (2 Comments) |

| computer assisted solution by Charlie (2014-07-29 11:55:29) |

Under Triangle Texture (in Shapes) Posted on 2014-07-28 (2 Comments) |

| re: My guess by Charlie (2014-07-28 17:33:02) |

Under 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) |

| contradictions? by Charlie (2014-07-27 19:10:51) |

Under The decisive straw (in Probability) Posted on 2014-07-25 (6 Comments) |

| computer exploration--heuristic approximation by Charlie (2014-07-25 14:06:27) |

Under Testy Triplet Treat II (in Just Math) Posted on 2014-07-25 (4 Comments) |

| solution by Charlie (2014-07-25 12:41:16) |

Under Choose-Product Conclusion (in Just Math) Posted on 2014-07-23 (1 Comments) |

| computer exploration (possible spoiler) by Charlie (2014-07-23 15:32:03) |

Under Last digit counts (in Numbers) Posted on 2014-07-23 (1 Comments) |

| computer solution by Charlie (2014-07-23 14:30:25) |

Under Reverse Rigor II (in Just Math) Posted on 2014-07-22 (4 Comments) |

| re(2): possible computer solution by Charlie (2014-07-22 13:43:14) |

| possible computer solution by Charlie (2014-07-22 11:58:31) |

Under Quiz Quandary III (in Logic) Posted on 2014-07-15 (8 Comments) |

| ignore previous post: solution correced by Charlie (2014-07-17 13:14:29) |

| computer solution by Charlie (2014-07-17 12:33:20) |

Under Sum Power Digit Determination (in Just Math) Posted on 2014-07-12 (4 Comments) |

| computer solution by Charlie (2014-07-12 12:30:34) |

Under A periodical fraction (in Numbers) Posted on 2014-07-11 (3 Comments) |

| computer solution by Charlie (2014-07-11 13:38:40) |

Under Cinq Confusion (in Shapes) Posted on 2014-07-10 (2 Comments) |

| computer solution by Charlie (2014-07-10 11:55:08) |

Under 3 features (in Numbers) Posted on 2014-07-08 (1 Comments) |

| computer solution by Charlie (2014-07-08 20:32:07) |

Under Mean Muse II (in Just Math) Posted on 2014-07-06 (1 Comments) |

| computer solution by Charlie (2014-07-07 13:27:19) |

Under Go on, it is easy (in General) Posted on 2014-07-05 (1 Comments) |

| solution by Charlie (2014-07-05 14:37:00) |

Under An equation (in Just Math) Posted on 2014-07-03 (5 Comments) |

| computer exploration by Charlie (2014-07-04 11:51:38) |

Under Only one basic solution (in Just Math) Posted on 2014-07-02 (2 Comments) |

| computer solutions by Charlie (2014-07-02 12:33:17) |

Under Arctan Appraisal (in Just Math) Posted on 2014-07-01 (2 Comments) |

| computer timing by Charlie (2014-07-01 13:06:54) |

Under End and Begin II (in Word Problems) Posted on 2014-06-30 (6 Comments) |

| A start by Charlie (2014-06-30 11:01:27) |

Under Some dinner! (in Cryptography) Posted on 2014-06-29 (2 Comments) |

| To avoid food poisoning... by Charlie (2014-06-29 12:50:40) |

Under Six Term Settlement (in Just Math) Posted on 2014-06-26 (3 Comments) |

| computer solutions by Charlie (2014-06-26 15:25:55) |

Under scitemahpla II (in Word Problems) Posted on 2014-06-25 (5 Comments) |

| re: solution by Charlie (2014-06-26 12:56:58) |

| solution by Charlie (2014-06-25 12:56:11) |

Under An enchanted coin (in Probability) Posted on 2014-06-24 (3 Comments) |

| possible solution by Charlie (2014-06-24 15:23:52) |

Under Smarandache Settlement (in Just Math) Posted on 2014-06-24 (2 Comments) |

| computer aided solution by Charlie (2014-06-24 12:58:06) |

Under 2+2=4 is true (in Just Math) Posted on 2014-06-22 (2 Comments) |

| computer solutions by Charlie (2014-06-22 13:07:40) |

Under Minimum Value Muse (in Just Math) Posted on 2014-06-20 (3 Comments) |

| computer solution by Charlie (2014-06-20 12:51:59) |

Under Diagram Dilemma (in Just Math) Posted on 2014-06-19 (1 Comments) |

| solution by Charlie (2014-06-19 15:26:15) |

Under A tall tower (in Geometry) Posted on 2014-06-18 (6 Comments) |

| re: Solution - Spoiler by Charlie (2014-06-19 10:03:56) |

| solution by Charlie (2014-06-19 09:57:57) |

Under Arithmetic Grid II (in |