perplexus.info :: Numbers : Special primes

Special primes (Posted on 2012-02-12)

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.

See The Solution Submitted by Ady TZIDON

Rating: 5.0000 (1 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)

re(2): computer solution

Comment 3 of 3 |

(In reply to re: computer solution by Charlie)

Some people (Sloane included) treat number 1 as a prime , since it is devisible by one and itself.

Posted by Ady TZIDON on 2012-02-13 11:59:24

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