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A000043 Primes p such that 2^p - 1 is prime. 2^p - 1 is then called a Mersenne prime.
(Formerly M0672 N0248)
+0
332
2, 3, 5, 7, 13, 17, 19, 31, 61, 89, 107, 127, 521, 607, 1279, 2203, 2281, 3217, 4253, 4423, 9689, 9941, 11213, 19937, 21701, 23209, 44497, 86243, 110503, 132049, 216091, 756839, 859433, 1257787, 1398269, 2976221, 3021377, 6972593, 13466917 (list; graph; listen)
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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.


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