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A006514
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2^p - 1 has at most 2 prime factors.
(Formerly M0653)
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0
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2, 3, 5, 7, 11, 13, 17, 19, 23, 31, 37, 41, 59, 61, 67, 83, 89, 97, 101, 103, 107, 109, 127, 131, 137, 139, 149, 167, 197, 199, 227, 241, 269, 271, 281, 293, 347, 373, 379, 421, 457, 487, 521
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| p must be a prime. [From Harvey P. Dale, Nov 11 2011]
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REFERENCES
| J. Brillhart et al., Factorizations of b^n +- 1. Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 2nd edition, 1985; and later supplements.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| J. Brillhart et al., Factorizations of b^n +- 1, Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 3rd edition, 2002.
S. S. Wagstaff, Jr., The Cunningham Project
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MATHEMATICA
| Select[Prime[Range[100]], PrimeOmega[2^#-1]<3&] (* From Harvey P. Dale, Nov 11 2011 *)
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CROSSREFS
| Sequence in context: A161929 A042966 A128898 * A086983 A046501 A033875
Adjacent sequences: A006511 A006512 A006513 * A006515 A006516 A006517
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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