# 5

This number is a prime.

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The smallest prime *p*such that both 2

*p*+ 1 and 2

^{p}- 1 (=

*M*

_{p}) are primes. Note that both 2

*M*

_{p}- 1 and 2

^{Mp}- 1 are also primes. [Beedassy]

Submitted: 2009-08-27 02:27:27; Last Modified: 2009-11-01 08:11:47.

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