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A002591
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Largest factor of 3^(2n+1) - 1.
(Formerly M4886 N2095)
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1
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2, 13, 11, 1093, 757, 3851, 797161, 4561, 34511, 363889, 368089, 1001523179, 391151, 8209, 20381027, 4404047, 2413941289, 2664097031, 17189128703, 797161, 86950696619, 380808546861411923, 927001, 96656723, 131713, 99810171997
(list;
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listen;
history;
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internal format)
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OFFSET
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0,1
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REFERENCES
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J. Brillhart et al., Factorizations of b^n +- 1. Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 2nd edition, 1985; and later supplements.
M. Kraitchik, Recherches sur la Théorie des Nombres. Gauthiers-Villars, Paris, Vol. 1, 1924, Vol. 2, 1929, see Vol. 2, p. 28.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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Table of n, a(n) for n = 0..329
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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CROSSREFS
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Sequence in context: A213306 A213307 A213305 * A037055 A065584 A153651
Adjacent sequences: A002588 A002589 A002590 * A002592 A002593 A002594
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane
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EXTENSIONS
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Corrected and extended by Jud McCranie, Jan 03 2001
Terms up to a(307) in b-file from Sean A. Irvine, Apr 20 2014
a(0) prepended and a(308)-a(329) added to b-file by Max Alekseyev, Apr 24 2019
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STATUS
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approved
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