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The smallest prime p such that both 2p + 1 and 2p - 1 (= Mp) are primes. Note that both 2Mp - 1 and 2Mp - 1 are also primes. [Beedassy]


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

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