Double Mersenne Prime
Basic Info
Discovered by Marin Mersenne
Number of Conjectured to be 4
Description A prime of the form 2^p-1 where p is of the form 2^m-1, where m is an integer
First Few 7, 127, 2,147,483,647

A Double Mersenne Prime is a Mersenne Prime of the form 2p - 1 for which p is also a Mersenne Prime. There are currently only 4 known double Mersenne Primes: 7, 127, 2,147,483,647, and 170,141,183,460,469,231,731,687,303,715,884,105,727. It is conjectured that these are the only double Mersenne Primes in existence.

See also

Mersenne Primes

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