47

This number is a prime.

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(47, 53, 59, 61) is the only tetrad of successive double-digit primes p < q < r < s such that (p+q) divides r*s+1, i.e., (47+53) divides 59*61+1. [Loungrides]

Submitted: 2015-08-24 18:52:20; Last Modified: 2019-04-16 11:53:25.