The 100th number (in Sequences) Rating: 5.00

Posted on 2018-12-10 by

Posted on 2018-12-10 by

**Math Man**(No Solution Yet, 7 Comments)Lefties and righties 2 (in Logic) Rating: 3.00

Posted on 2018-09-11 by

Posted on 2018-09-11 by

**Math Man**(No Solution Yet, 2 Comments)Prime records (in Sequences) Rating: 5.00

Posted on 2018-04-06 by

Posted on 2018-04-06 by

**Math Man**(No Solution Yet, 3 Comments)A prime nonuplet (in Numbers) Rating: 5.00

Posted on 2017-12-27 by

Posted on 2017-12-27 by

**Math Man**(No Solution Yet, 4 Comments)Prime power puzzle (in Just Math) Rating: 5.00

Posted on 2017-04-01 by

Posted on 2017-04-01 by

**Math Man**(No Solution Yet, 8 Comments)Fibonacci Fib (in Sequences) Rating: 5.00

Posted on 2017-02-23 by

Posted on 2017-02-23 by

**Math Man**(No Solution Yet, 1 Comments)An interesting recurrence (in Numbers) Rating: 5.00

Posted on 2017-01-17 by

Posted on 2017-01-17 by

**Math Man**(No Solution Yet, 5 Comments)Legally Blonde (in Liars and Knights) Rating: 3.00

Posted on 2016-12-19 by

Posted on 2016-12-19 by

**Math Man**(No Solution Yet, 8 Comments)Terrific sequence 2 (in Sequences) Rating: 5.00

Posted on 2016-11-20 by

Posted on 2016-11-20 by

**Math Man**(No Solution Yet, 2 Comments)A surprising prime gap (in Numbers) Rating: 5.00

Posted on 2016-07-27 by

Posted on 2016-07-27 by

**Math Man**(Solution Posted, 8 Comments)Terrific sequence (in Sequences) Rating: 5.00

Posted on 2016-05-10 by

Posted on 2016-05-10 by

**Math Man**(No Solution Yet, 6 Comments)Primevens and primeodds (in Numbers) Rating: 4.00

Posted on 2016-01-10 by

Posted on 2016-01-10 by

**Math Man**(No Solution Yet, 8 Comments)Numbered Letters IV (in Word Problems)

Posted on 2015-10-26 by

Posted on 2015-10-26 by

**Math Man**(No Solution Yet, 2 Comments)Marissa's and Melissa's birthdays (in Logic)

Posted on 2015-09-17 by

Posted on 2015-09-17 by

**Math Man**(No Solution Yet, 1 Comments)Lefties and righties (in Logic) Rating: 4.50

Posted on 2015-06-10 by

Posted on 2015-06-10 by

**Math Man**(Solution Posted, 2 Comments)Island Adventure 2 (in Liars and Knights)

Posted on 2015-04-21 by

Posted on 2015-04-21 by

**Math Man**(No Solution Yet, 4 Comments)Island Adventure (in Liars and Knights)

Posted on 2015-03-26 by

Posted on 2015-03-26 by

**Math Man**(No Solution Yet, 1 Comments)Composite prime (in Numbers) Rating: 5.00

Posted on 2015-02-24 by

Posted on 2015-02-24 by

**Math Man**(No Solution Yet, 2 Comments)Number machine problem 2 (in Algorithms) Rating: 4.00

Posted on 2014-12-02 by

Posted on 2014-12-02 by

**Math Man**(Solution Posted, 3 Comments)Odd people 2 (in Liars and Knights) Rating: 2.67

Posted on 2014-10-07 by

Posted on 2014-10-07 by

**Math Man**(No Solution Yet, 2 Comments)Keys and boxes (in Logic) Rating: 2.50

Posted on 2014-07-31 by

Posted on 2014-07-31 by

**Math Man**(Solution Posted, 2 Comments)Colorful hats (in Logic) Rating: 2.00

Posted on 2014-04-16 by

Posted on 2014-04-16 by

**Math Man**(Solution Posted, 6 Comments)Coded Crossword 2 (in Cryptography) Rating: 5.00

Posted on 2014-01-24 by

Posted on 2014-01-24 by

**Math Man**(Solution Posted, 2 Comments)Unitary perfect numbers (in Just Math) Rating: 5.00

Posted on 2013-12-16 by

Posted on 2013-12-16 by

**Math Man**(Solution Posted, 10 Comments)Great sequence (in Sequences) Rating: 5.00

Posted on 2013-11-28 by

Posted on 2013-11-28 by

**Math Man**(No Solution Yet, 3 Comments)Knaves! 2 (in Liars and Knights) Rating: 1.00

Posted on 2013-10-22 by

Posted on 2013-10-22 by

**Math Man**(Solution Posted, 1 Comments)The Exclusive Club (in Paradoxes) Rating: 5.00

Posted on 2013-07-01 by

Posted on 2013-07-01 by

**Math Man**(No Solution Yet, 8 Comments)Liar Logic (in Liars and Knights) Rating: 5.00

Posted on 2013-04-11 by

Posted on 2013-04-11 by

**Math Man**(Solution Posted, 2 Comments)Primary Problem 2 (in Just Math) Rating: 5.00

Posted on 2012-12-09 by

Posted on 2012-12-09 by

**Math Man**(No Solution Yet, 4 Comments)The way to Normalville (in Liars and Knights) Rating: 3.75

Posted on 2012-10-05 by

Posted on 2012-10-05 by

**Math Man**(Solution Posted, 13 Comments)Metapuzzle (in Liars and Knights) Rating: 5.00

Posted on 2012-09-13 by

Posted on 2012-09-13 by

**Math Man**(Solution Posted, 4 Comments)The number p (in Numbers) Rating: 4.00

Posted on 2012-08-19 by

Posted on 2012-08-19 by

**Math Man**(No Solution Yet, 1 Comments)Mutually friendly 3 (in Logic) Rating: 5.00

Posted on 2012-08-05 by

Posted on 2012-08-05 by

**Math Man**(Solution Posted, 11 Comments)All 10 digits (in Probability) Rating: 5.00

Posted on 2012-07-06 by

Posted on 2012-07-06 by

**Math Man**(Solution Posted, 5 Comments)Day-knights and night-knights 4 (in Logic) Rating: 3.00

Posted on 2012-07-02 by

Posted on 2012-07-02 by

**Math Man**(Solution Posted, 2 Comments)Fruit prices (in Word Problems) Rating: 4.00

Posted on 2012-06-05 by

Posted on 2012-06-05 by

**Math Man**(Solution Posted, 8 Comments)Cheating by not cheating (in Riddles) Rating: 5.00

Posted on 2012-05-30 by

Posted on 2012-05-30 by

**Math Man**(Solution Posted, 12 Comments)Minimal Primes (in Numbers) Rating: 4.67

Posted on 2012-04-24 by

Posted on 2012-04-24 by

**Math Man**(No Solution Yet, 5 Comments)Redundant questions (in Word Problems) Rating: 5.00

Posted on 2012-03-19 by

Posted on 2012-03-19 by

**Math Man**(Solution Posted, 11 Comments)Logical connectives (in Algorithms) Rating: 4.50

Posted on 2012-01-24 by

Posted on 2012-01-24 by

**Math Man**(Solution Posted, 6 Comments)Numbered Words (in Word Problems) Rating: 4.00

Posted on 2011-11-04 by

Posted on 2011-11-04 by

**Math Man**(Solution Posted, 2 Comments)Coded Crossword (in Cryptography) Rating: 5.00

Posted on 2011-10-10 by

Posted on 2011-10-10 by

**Math Man**(Solution Posted, 1 Comments)Two-digit numbers (in Sequences) Rating: 4.33

Posted on 2011-09-29 by

Posted on 2011-09-29 by

**Math Man**(Solution Posted, 4 Comments)No primes 2 (in Numbers) Rating: 4.00

Posted on 2011-07-29 by

Posted on 2011-07-29 by

**Math Man**(Solution Posted, 2 Comments)Superprimes (in Numbers) Rating: 3.00

Posted on 2011-07-18 by

Posted on 2011-07-18 by

**Math Man**(Solution Posted, 2 Comments)Mutually friendly 2 (in Logic) Rating: 5.00

Posted on 2011-07-01 by

Posted on 2011-07-01 by

**Math Man**(Solution Posted, 4 Comments)Knights and Liars of the Round Table (in Liars and Knights) Rating: 3.00

Posted on 2011-06-10 by

Posted on 2011-06-10 by

**Math Man**(Solution Posted, 4 Comments)Interesting numbers (in Sequences) Rating: 3.00

Posted on 2011-06-07 by

Posted on 2011-06-07 by

**Math Man**(Solution Posted, 3 Comments)Will I get a dog? (in Logic) Rating: 4.00

Posted on 2011-05-20 by

Posted on 2011-05-20 by

**Math Man**(Solution Posted, 6 Comments)Joe's favorite number (in Liars and Knights) Rating: 4.00

Posted on 2011-04-27 by

Posted on 2011-04-27 by

**Math Man**(Solution Posted, 4 Comments)Random number sequence (in Probability)

Posted on 2011-04-20 by

Posted on 2011-04-20 by

**Math Man**(Solution Posted, 2 Comments)Factor numbers (in Just Math) Rating: 4.80

Posted on 2011-03-26 by

Posted on 2011-03-26 by

**Math Man**(Solution Posted, 5 Comments)Day-knights and night-knights 3 (in Logic) Rating: 1.00

Posted on 2011-03-21 by

Posted on 2011-03-21 by

**Math Man**(Solution Posted, 1 Comments)Prime times (in Numbers) Rating: 4.00

Posted on 2011-03-18 by

Posted on 2011-03-18 by

**Math Man**(Solution Posted, 1 Comments)Day-knights and night-knights 2 (in Logic) Rating: 5.00

Posted on 2011-03-15 by

Posted on 2011-03-15 by

**Math Man**(Solution Posted, 2 Comments)Day-knights and night-knights (in Logic) Rating: 3.00

Posted on 2011-03-08 by

Posted on 2011-03-08 by

**Math Man**(Solution Posted, 3 Comments)A fun prime number (in Numbers) Rating: 5.00

Posted on 2011-02-15 by

Posted on 2011-02-15 by

**Math Man**(Solution Posted, 4 Comments)Knave trial (in Liars and Knights) Rating: 4.50

Posted on 2011-02-03 by

Posted on 2011-02-03 by

**Math Man**(Solution Posted, 1 Comments)A cool prime number (in Numbers) Rating: 4.00

Posted on 2011-01-27 by

Posted on 2011-01-27 by

**Math Man**(Solution Posted, 3 Comments)Gold rush (in Liars and Knights) Rating: 4.50

Posted on 2011-01-24 by

Posted on 2011-01-24 by

**Math Man**(Solution Posted, 3 Comments)A sequence (in Sequences) Rating: 3.50

Posted on 2011-01-14 by

Posted on 2011-01-14 by

**Math Man**(Solution Posted, 3 Comments)X and Y (in Liars and Knights) Rating: 4.00

Posted on 2011-01-04 by

Posted on 2011-01-04 by

**Math Man**(Solution Posted, 3 Comments)