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Search: id:A006515
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| A006515 |
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Mersenne numbers with at most 2 prime factors.
(Formerly M2695)
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+0
1
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| 3, 7, 31, 127, 2047, 8191, 131071, 524287, 8388607, 2147483647, 137438953471, 2199023255551, 576460752303423487, 2305843009213693951, 147573952589676412927
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
J. Brillhart et al., Factorizations of b^n +- 1. Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 2nd edition, 1985; and later supplements.
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LINKS
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J. Brillhart et al., Factorizations of b^n +- 1, Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 3rd edition, 2002.
C. K. Caldwell, Mersenne primes
S. S. Wagstaff, Jr., The Cunningham Project
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CROSSREFS
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Cf. A001348.
Sequence in context: A105768 A084924 A001348 this_sequence A093535 A081093 A057612
Adjacent sequences: A006512 A006513 A006514 this_sequence A006516 A006517 A006518
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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