7

This number is a prime.

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(7, 11, 13) is the first consecutive prime number triple (p, q, r) such that r divides pq+1. Note that the quotient is 6 (the first perfect number). [Loungrides]

Submitted: 2011-01-05 17:50:19; Last Modified: 2011-01-05 18:08:56.