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A surprising prime gap (Posted on 2016-07-27) Difficulty: 3 of 5
N is a positive integer. If you list the positive integers in rows of N such that the first row contains 1 to N, the second row contains N+1 to 2*N, and so on, then the first row with no prime is immediately followed by another row with no prime. What is N?

See The Solution Submitted by Math Man    
Rating: 5.0000 (1 votes)

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  Subject Author Date
re(5): My solution Charlie2016-08-01 07:57:10
re(4): My solution Jer2016-07-31 21:45:02
re(3): My solution Charlie2016-07-31 18:45:10
Questionre(2): My solution Ady TZIDON2016-07-31 02:21:06
re: My solutionMath Man2016-07-30 20:37:42
re: My solutionCharlie2016-07-30 09:13:56
My solutionJer2016-07-27 18:05:19
Solutioncomputer solutionCharlie2016-07-27 16:45:07
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