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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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re(4): My solution | Comment 7 of 8 |
(In reply to re(3): My solution by Charlie)

This is far from a proof.  You're just stating it's unlikely there is another N.  But if you think about it, it was unlikely there was going to be a first N - and there was.


I reminds me of trying to prove there is no odd perfect number.



  Posted by Jer on 2016-07-31 21:45:02
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