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Special primes (Posted on 2012-02-12) Difficulty: 3 of 5
There are two primes, both below 100, that evenly divide the sum of the primes less than themselves.

Find those two primes.

The only other such prime below 2,000,000 is M, the n-th prime.

Find M and n.

  Submitted by Ady TZIDON    
Rating: 5.0000 (1 votes)
Solution: (Hide)
5 AND 71 - for the first part - .As for the second part, 369,119 is the 31,464 th prime

Comments: ( You must be logged in to post comments.)
  Subject Author Date
re(2): computer solutionAdy TZIDON2012-02-13 11:59:24
re: computer solutionCharlie2012-02-12 18:33:42
Solutioncomputer solutionCharlie2012-02-12 18:26:57
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