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Difficulty: 2 of 5Under Dimsums LTD (in Numbers)
Posted on 2017-10-16 (1 Comments)
Solution solution by Paul (2017-10-16 10:40:41)
Difficulty: 3 of 5Under Lots of lods (in Sequences)
Posted on 2017-09-10 (7 Comments)
Solution Alternate approach by Paul (2017-09-11 11:34:05)
Difficulty: 3 of 5Under Prime ages (in Just Math)
Posted on 2017-08-23 (1 Comments)
solution by Paul (2017-08-23 11:41:27)
Difficulty: 4 of 5Under Commutative Exponentiation (in Just Math)
Posted on 2017-07-07 (6 Comments)
Solution rest of the solution by Paul (2017-07-07 15:09:38)
rational solutions by Paul (2017-07-07 14:53:40)
Difficulty: 2 of 5Under The Dot-town Suicides (in Logic)
Posted on 2017-04-20 (1 Comments)
explanation (maybe not rigorous enough for proof) by Paul (2017-04-24 10:01:33)
Difficulty: 4 of 5Under Growth Potential (in Algorithms)
Posted on 2017-04-13 (4 Comments)
Solution Yet another proof by Paul (2017-04-13 12:25:16)
Difficulty: 1 of 5Under QUICKIE X (in Just Math)
Posted on 2017-03-28 (3 Comments)
a bit sketchy but still a solution by Paul (2017-03-29 12:23:15)
Difficulty: 2 of 5Under At most - equality (in Just Math)
Posted on 2017-03-06 (1 Comments)
Solution solution by Paul (2017-03-06 08:45:57)
Difficulty: 3 of 5Under Square expressions (in Numbers)
Posted on 2017-02-18 (3 Comments)
re: A solution by Paul (2017-02-20 17:41:09)
Difficulty: 3 of 5Under Sets' intersection (in Just Math)
Posted on 2017-02-16 (2 Comments)
Solution solution by Paul (2017-02-16 11:34:57)
Difficulty: 2 of 5Under Age Progression (in Numbers)
Posted on 2017-01-16 (3 Comments)
solution? by Paul (2017-01-16 12:39:18)
Difficulty: 2 of 5Under Prime candidates (in Just Math)
Posted on 2016-12-20 (5 Comments)
re(2): solution -@ Paul by Paul (2016-12-23 12:03:22)
Solution solution by Paul (2016-12-20 13:28:38)
Difficulty: 3 of 5Under In terzo luogo (in Sequences)
Posted on 2016-11-13 (4 Comments)
Solution solution by Paul (2016-11-15 09:32:48)
Difficulty: 3 of 5Under Random Trial (in Algorithms)
Posted on 2016-10-02 (3 Comments)
One approach by Paul (2016-10-03 12:46:40)
Difficulty: 2 of 5Under Number prediction (in Tricks)
Posted on 2016-09-26 (1 Comments)
suspicious by Paul (2016-09-26 16:16:09)
Difficulty: 3 of 5Under Duodecimal Pandigital Divisibility Device (in Algorithms)
Posted on 2016-09-13 (2 Comments)
re: Choice of two algorithms by Paul (2016-09-13 19:01:57)
Difficulty: 3 of 5Under Divisibility Property (in Numbers)
Posted on 2016-08-31 (2 Comments)
Solution Without Software by Paul (2016-08-31 13:59:45)
Difficulty: 3 of 5Under Guessing your birthdate (in Just Math)
Posted on 2016-08-18 (4 Comments)
part a by Paul (2016-08-19 17:52:14)
Difficulty: 3 of 5Under Divisibility with lcm and gcd (in Just Math)
Posted on 2016-08-15 (4 Comments)
re(2): Answer and reasoning by Paul (2016-08-16 11:32:42)
Solution Answer and reasoning by Paul (2016-08-15 13:30:32)
Difficulty: 3 of 5Under Rocking moves (in Logic)
Posted on 2016-05-17 (3 Comments)
Solution by Paul (2016-05-17 15:26:44)
Difficulty: 3 of 5Under No Equal Weighings (in Weights and Scales)
Posted on 2016-04-18 (4 Comments)
Solution Analytic confirmation by Paul (2016-04-20 11:00:42)
Difficulty: 3 of 5Under One of Sixteen (in Weights and Scales)
Posted on 2015-12-29 (12 Comments)
Solution Solution (hard) by Paul (2015-12-30 12:08:39)
Difficulty: 3 of 5Under Get the right product (in Just Math)
Posted on 2015-12-01 (5 Comments)
Solution solution by Paul (2015-12-01 17:56:12)
Difficulty: 2 of 5Under Four factors (in Just Math)
Posted on 2015-11-06 (2 Comments)
Solution solution by Paul (2015-11-06 09:48:00)
Difficulty: 2 of 5Under Must differ by 3 (in Just Math)
Posted on 2015-10-23 (3 Comments)
Solution analytic solution by Paul (2015-10-27 11:19:17)
Difficulty: 3 of 5Under Palindromes and Divisibility (in Just Math)
Posted on 2015-10-16 (3 Comments)
Solution analytic solution by Paul (2015-10-16 12:16:55)
Difficulty: 2 of 5Under Black and white socks (in Probability)
Posted on 2015-09-29 (8 Comments)
re(2): Solution?? by Paul (2015-09-29 14:31:08)
Solution?? by Paul (2015-09-29 11:59:43)
Difficulty: 3 of 5Under Expression Product Exercise (in Just Math)
Posted on 2015-09-18 (5 Comments)
Not especially rigorous but hopefully valid solution by Paul (2015-09-21 15:19:24)
Difficulty: 3 of 5Under Some definite results (in Numbers)
Posted on 2015-09-17 (5 Comments)
re(2): non-analytic solution by Paul (2015-09-18 10:00:19)
non-analytic solution by Paul (2015-09-17 14:53:14)
Difficulty: 3 of 5Under Eight efficient blacksmiths (in Just Math)
Posted on 2015-08-13 (4 Comments)
Solution Solution (slightly differently) by Paul (2015-08-13 11:14:14)
Difficulty: 3 of 5Under Red, White, and Blue (in Logic)
Posted on 2015-07-29 (4 Comments)
Solution proof by Paul (2015-07-29 15:47:02)
Difficulty: 2 of 5Under Island Adventure 2 (in Liars and Knights)
Posted on 2015-04-21 (4 Comments)
Solution Answer with explanation by Paul (2015-04-22 19:13:20)
Difficulty: 3 of 5Under Geometric and Harmonic Harmony (in Just Math)
Posted on 2014-12-15 (4 Comments)
solution (no proof) by Paul (2014-12-15 16:34:06)
Difficulty: 3 of 5Under Balancing weights (in Weights and Scales)
Posted on 2014-11-06 (2 Comments)
Solution solution by Paul (2014-11-06 11:50:03)
Difficulty: 2 of 5Under 4 ways (in Sequences)
Posted on 2014-06-04 (6 Comments)
Solution solution by Paul (2014-06-04 18:08:56)
Difficulty: 1 of 5Under Sequence containing itself (in Numbers)
Posted on 2014-05-14 (1 Comments)
sketch of proof by Paul (2014-05-14 22:44:11)
Difficulty: 3 of 5Under Increase or decrease by one (in Numbers)
Posted on 2014-04-22 (2 Comments)
Solution Analytic Solution by Paul (2014-04-22 18:46:22)
Difficulty: 3 of 5Under Perfectly Harmonic (in Just Math)
Posted on 2013-11-13 (3 Comments)
Solution Solution by Paul (2013-11-13 19:58:55)
Difficulty: 3 of 5Under Forty-five Product (in Just Math)
Posted on 2013-10-28 (2 Comments)
Solution Solution a slightly different way by Paul (2013-10-28 15:14:24)
Difficulty: 3 of 5Under What's the ... (in Just Math)
Posted on 2013-06-27 (2 Comments)
solution? by Paul (2013-06-27 19:24:22)
Difficulty: 2 of 5Under Infinite Product (in Numbers)
Posted on 2013-06-24 (3 Comments)
Solution Analytic solution by Paul (2013-06-24 18:07:53)
Difficulty: 3 of 5Under Integer Pairs (in Just Math)
Posted on 2013-05-30 (2 Comments)
Solution solution with very inelegant proof by Paul (2013-06-04 03:11:16)
Difficulty: 3 of 5Under Generalize (in Numbers)
Posted on 2013-05-01 (5 Comments)
re: Can you prove it? by Paul (2013-05-02 15:13:03)
Difficulty: 2 of 5Under Mission impossible (in Just Math)
Posted on 2013-04-03 (5 Comments)
Solution Solution a different way by Paul (2013-04-03 19:31:05)
Difficulty: 3 of 5Under Covert Quantity (in Logic)
Posted on 2013-04-02 (4 Comments)
Solution Solution with proof by Paul (2013-04-03 19:44:04)
Difficulty: 1 of 5Under Slope products (in Geometry)
Posted on 2011-11-08 (3 Comments)
Solution by Paul (2011-11-08 18:56:41)
Difficulty: 2 of 5Under Prime Test (1) (in Numbers)
Posted on 2011-04-25 (1 Comments)
Solution solution by Paul (2011-04-25 20:29:17)
Difficulty: 2 of 5Under Scarce primes (in Numbers)
Posted on 2011-01-10 (10 Comments)
Solution proof by Paul (2011-01-10 22:23:15)
Difficulty: 3 of 5Under Card Tableau in Black and White (in Logic)
Posted on 2010-11-30 (3 Comments)
Solution complete solution by Paul (2010-11-30 22:50:57)
Difficulty: 3 of 5Under Face book (in Cryptography)
Posted on 2010-11-29 (11 Comments)
Hints/Tips re(2): Applying it by Paul (2010-12-01 18:04:53)
Difficulty: 3 of 5Under 2008 a fourth power? Baseless! (in Just Math)
Posted on 2010-10-09 (3 Comments)
Solution solution by Paul (2010-10-09 17:54:53)
Difficulty: 3 of 5Under The Rebel IV (in Liars and Knights)
Posted on 2010-01-30 (3 Comments)
Solution solution with explanation by Paul (2010-02-02 02:57:52)
Difficulty: 3 of 5Under Runners on a Square Field (in Just Math)
Posted on 2009-01-15 (4 Comments)
Solution solution by Paul (2009-01-15 22:23:20)
Difficulty: 2 of 5Under Bulbs and Switches (in Logic)
Posted on 2009-01-11 (8 Comments)
re(2): solution? by Paul (2009-01-15 22:24:25)
solution? by Paul (2009-01-12 19:05:12)
Difficulty: 2 of 5Under Digits 251 in sequence (in Just Math)
Posted on 2009-01-05 (5 Comments)
Some Thoughts upper bound by Paul (2009-01-05 15:10:46)
Difficulty: 2 of 5Under 2000 cards (in General)
Posted on 2009-01-04 (9 Comments)
Solution non-computer solution by Paul (2009-01-05 17:39:13)
Difficulty: 3 of 5Under Getting Squared With Dates (in Numbers)
Posted on 2008-12-23 (3 Comments)
Solution (mostly) non computer-assisted solution by Paul (2008-12-23 18:12:51)
Difficulty: 2 of 5Under Going Digital With Pythagoras (in Just Math)
Posted on 2008-11-08 (3 Comments)
Solution analytic solution by Paul (2008-11-08 23:38:36)
Difficulty: 3 of 5Under Two Polygons (in Numbers)
Posted on 2008-10-29 (5 Comments)
Some Thoughts re: solution by Paul (2008-10-29 15:36:43)
Difficulty: 3 of 5Under Pretty Potent Power Pair(s) (in Just Math)
Posted on 2008-10-22 (2 Comments)
Solution solution by Paul (2008-10-22 18:59:53)
Difficulty: 2 of 5Under Cows, horses and dogs (in Just Math)
Posted on 2008-10-20 (12 Comments)
Solution proof of uniqueness by Paul (2008-10-20 21:01:56)
Difficulty: 3 of 5Under Absolute Value And Real Constant (in Just Math)
Posted on 2008-10-17 (3 Comments)
Solution solution by Paul (2008-10-17 15:05:55)
Difficulty: 2 of 5Under Crazy math? (in General)
Posted on 2008-10-10 (5 Comments)
re(2): answer with explanation.... nice work, but by Paul (2008-10-13 05:25:14)
Solution answer with explanation by Paul (2008-10-10 21:50:29)
Difficulty: 2 of 5Under Getting Floored With 28 (in Just Math)
Posted on 2008-09-06 (4 Comments)
Solution Similar but not identical solution by Paul (2008-09-06 22:31:54)
Difficulty: 2 of 5Under Doubles on reverse (in Just Math)
Posted on 2008-09-02 (3 Comments)
Solution Analytic solution by Paul (2008-09-02 23:12:54)
Difficulty: 3 of 5Under Same Degree Vertices (in Logic)
Posted on 2008-08-21 (1 Comments)
Solution solution by Paul (2008-08-22 22:07:58)
Difficulty: 3 of 5Under 'Snake-Eyes ' Joe (in Probability)
Posted on 2008-07-28 (13 Comments)
Some Thoughts possible theory by Paul (2008-07-28 19:36:45)
Difficulty: 2 of 5Under Identify the cities (in General)
Posted on 2008-07-25 (9 Comments)
a similar approach by Paul (2008-07-25 23:06:51)
Difficulty: 2 of 5Under Find the Strategy (in Logic)
Posted on 2008-07-02 (15 Comments)
Solution Possible solution by Paul (2008-07-03 20:22:22)
Difficulty: 2 of 5Under Perfect Square Too (in Just Math)
Posted on 2008-06-21 (6 Comments)
Solution solution with proof by Paul (2008-06-23 18:23:01)
Difficulty: 3 of 5Under Devious Kinder Blocks (in Tricks)
Posted on 2008-06-18 (7 Comments)
Solution where's the trick? by Paul (2008-06-18 18:36:23)
Difficulty: 3 of 5Under Evaluate this infinite product (in Calculus)
Posted on 2008-06-05 (5 Comments)
Some Thoughts Identity of numeric value by Paul (2008-06-06 16:03:28)
Difficulty: 2 of 5Under Two Digit Number (in Liars and Knights)
Posted on 2008-05-30 (4 Comments)
Solution solution by Paul (2008-05-30 16:32:47)
Difficulty: 2 of 5Under What a difference two roots make ! (in Calculus)
Posted on 2008-05-24 (5 Comments)
Solution a different approach to the same solution by Paul (2008-05-25 20:17:07)
Difficulty: 3 of 5Under Subsquares (in Numbers)
Posted on 2008-05-21 (9 Comments)
four by four and on by Paul (2008-05-21 21:20:42)
Some Thoughts two by two by Paul (2008-05-21 20:50:41)
Difficulty: 2 of 5Under Rooting For The Limit (in Calculus)
Posted on 2008-04-23 (6 Comments)
Some Thoughts not very rigorous solution by Paul (2008-04-25 23:59:00)
Difficulty: 4 of 5Under Sum of Powers (in Numbers)
Posted on 2008-04-21 (5 Comments)
thoughts by Paul (2008-04-24 07:38:36)
Difficulty: 3 of 5Under Broken Lights Out (in Logic)
Posted on 2008-04-07 (4 Comments)
Some Thoughts towards a solution (but not quite there) by Paul (2008-04-15 04:44:22)
Difficulty: 2 of 5Under Real Powerful Logarithms (in Just Math)
Posted on 2008-04-04 (4 Comments)
Solution analytic solution by Paul (2008-04-15 04:25:57)
Difficulty: 4 of 5Under Knave Contest (in Liars and Knights)
Posted on 2008-04-03 (7 Comments)
Solution non-computer explanation of solution by Paul (2008-04-04 01:02:19)
Difficulty: 4 of 5Under Dao Juxing (The way of the rectangle) (in Shapes)
Posted on 2008-03-28 (6 Comments)
A similar conclusion by Paul (2008-03-28 20:01:28)
Difficulty: 1 of 5Under Going Geometric With The Limit (in Calculus)
Posted on 2008-03-26 (6 Comments)
Solution not 100% rigorous solution by Paul (2008-03-27 02:56:37)
Difficulty: 4 of 5Under Election in Logistan (in Liars and Knights)
Posted on 2008-03-24 (31 Comments)
Some Thoughts another thought by Paul (2008-03-24 17:38:34)
Difficulty: 3 of 5Under Circular Balance (in Weights and Scales)
Posted on 2008-03-20 (22 Comments)
Solution equilibrium? (amendement to solution) by Paul (2008-03-27 02:35:45)
Solution Equilibrium/extended solution by Paul (2008-03-21 19:50:59)
Difficulty: 2 of 5Under Getting Primed With Subtraction And Addition (in Just Math)
Posted on 2007-12-26 (5 Comments)
Solution solution slightly differently by Paul (2007-12-27 21:05:57)
Difficulty: 3 of 5Under Arrange with 3-4-5 difference (in Just Math)
Posted on 2007-10-16 (7 Comments)
Solution solution by Paul (2007-10-16 20:33:58)
Difficulty: 2 of 5Under A real p puzzle (in Just Math)
Posted on 2007-10-02 (5 Comments)
Solution solution slightly differently by Paul (2007-10-04 06:08:22)
Difficulty: 4 of 5Under TGIF (in Logic)
Posted on 2007-08-31 (5 Comments)
Solution solution by Paul (2007-09-01 19:37:24)
Difficulty: 3 of 5Under The Last Three Digits (in Numbers)
Posted on 2007-08-28 (8 Comments)
Solution proof of solution by Paul (2007-08-28 19:41:59)
Difficulty: 2 of 5Under Getting Primes With 2 And 4 (in Numbers)
Posted on 2007-08-19 (6 Comments)
re(2): f and g by Paul (2007-08-22 17:55:30)
Solution f and g by Paul (2007-08-21 15:56:52)
Difficulty: 2 of 5Under Starbucks! (in Just Math)
Posted on 2007-08-18 (11 Comments)
Solution solution by Paul (2007-08-18 17:44:27)
Difficulty: 3 of 5Under Quadruple Agent (in Probability)
Posted on 2007-07-25 (11 Comments)
Solution solution a different way by Paul (2007-07-26 19:29:41)
Difficulty: 3 of 5Under Close to Fermat (in Numbers)
Posted on 2007-04-06 (4 Comments)
Solution inelegant solution by Paul (2007-04-07 03:40:34)
Difficulty: 3 of 5Under Wolf in a field (in Algorithms)
Posted on 2006-02-23 (17 Comments)
dead dog? by Paul (2006-02-25 00:02:40)
Difficulty: 3 of 5Under Making poverty history (in Numbers)
Posted on 2006-02-19 (9 Comments)
Solution non-computer solution by Paul (2006-02-24 00:36:31)
Difficulty: 3 of 5Under Challenging Chess Championship (in Games)
Posted on 2005-11-16 (13 Comments)
Some Thoughts starting at the bottom by Paul (2005-11-17 02:34:14)
Difficulty: 3 of 5Under The 3-digit Number (in Just Math)
Posted on 2005-10-16 (18 Comments)
re(3): 3 digit number by Paul (2005-10-17 23:05:36)
Difficulty: 2 of 5Under Shorten and halve (in Word Problems)
Posted on 2005-09-21 (32 Comments)
literal? by Paul (2005-10-01 06:46:00)
Difficulty: 3 of 5Under A Three Way Scale (in Weights and Scales)
Posted on 2005-09-05 (3 Comments)
Solution a lengthy solution by Paul (2005-09-06 02:26:36)
Difficulty: 3 of 5Under Sorta pythagoric... (in Numbers)
Posted on 2005-09-01 (16 Comments)
re: Am I missing something? by Paul (2005-09-06 01:47:41)
Some Thoughts more chipping by Paul (2005-09-05 10:09:06)
Some Thoughts chipping away at the possibilities by Paul (2005-09-02 04:13:26)
Some Thoughts uninteresting solution by Paul (2005-09-01 17:15:58)
Difficulty: 2 of 5Under 7 sounds (in Word Problems)
Posted on 2005-08-24 (10 Comments)
re: More than 7 (okay only 7) by Paul (2005-08-24 08:46:00)
Difficulty: 2 of 5Under Digital sum (in Just Math)
Posted on 2005-08-20 (7 Comments)
Solution Suspicions confirmed by Paul (2005-08-20 20:32:01)
Difficulty: 3 of 5Under Just Jauntily Jousting (in Liars and Knights)
Posted on 2005-08-15 (8 Comments)
re(2): Ignorance is key - help! by Paul (2005-08-16 04:31:05)
Solution Ignorance is key by Paul (2005-08-16 03:15:14)
Difficulty: 3 of 5Under Where is the White King? (in Games)
Posted on 2005-08-05 (21 Comments)
re(3): Observations -- and a hint by Paul (2005-08-05 22:02:19)
Difficulty: 1 of 5Under Knot or Not? (in Probability)
Posted on 2005-08-04 (16 Comments)
re: As I figure it by Paul (2005-08-04 02:28:04)
Difficulty: 2 of 5Under Et Tu, Brute? (in Sequences)
Posted on 2005-08-02 (15 Comments)
Solution A more Cesarean solution by Paul (2005-08-06 01:01:27)
Difficulty: 3 of 5Under Two to the Tee (in Numbers)
Posted on 2005-07-29 (5 Comments)
Solution the rest of the solution by Paul (2005-07-30 08:39:10)
another small observation by Paul (2005-07-29 21:13:27)
Difficulty: 2 of 5Under Two rights out of 24 wrongs (in General)
Posted on 2005-07-27 (11 Comments)
re: Comparing proofs by Paul (2005-07-29 21:25:42)
Solution Solution by Paul (2005-07-27 00:54:49)
Difficulty: 3 of 5Under Lemonade (in Weights and Scales)
Posted on 2005-07-26 (18 Comments)
Solution Solution, but not necessarily minimal by Paul (2005-07-26 02:17:51)
Difficulty: 3 of 5Under What's Going On? (in Numbers)
Posted on 2005-07-05 (4 Comments)
Some Thoughts a thought by Paul (2005-07-05 21:13:22)
Difficulty: 2 of 5Under Three Tests, Take Three! (in Weights and Scales)
Posted on 2005-06-23 (14 Comments)
re: The answer is ... by Paul (2005-06-24 01:38:26)
Difficulty: 1 of 5Under Even, or Odd? (in Sequences)
Posted on 2005-06-20 (14 Comments)
Some Thoughts re: Spoiler by Paul (2005-06-20 22:04:20)
Difficulty: 3 of 5Under Splitting Heirs (in Shapes)
Posted on 2005-06-15 (10 Comments)
Hints/Tips maximum size of possible solution by Paul (2005-06-15 20:55:34)
Difficulty: 2 of 5Under Square pairs (in Just Math)
Posted on 2005-06-15 (7 Comments)
Hints/Tips proof that previous solution is minimal by Paul (2005-06-15 21:09:10)
Difficulty: 3 of 5Under Unusual binary representation (in Numbers)
Posted on 2005-06-14 (9 Comments)
Solution a slightly different proof by Paul (2005-06-18 01:46:25)
Difficulty: 2 of 5Under Strange divisibility (in Just Math)
Posted on 2005-05-25 (27 Comments)
Solution solution by Paul (2005-06-13 21:47:24)
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