

A002591


Largest factor of 3^(2n+1)  1.
(Formerly M4886 N2095)


1



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
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OFFSET

0,1


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.
M. Kraitchik, Recherches sur la ThÃ©orie des Nombres. GauthiersVillars, 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).


LINKS

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


CROSSREFS

Sequence in context: A213306 A213307 A213305 * A037055 A065584 A153651
Adjacent sequences: A002588 A002589 A002590 * A002592 A002593 A002594


KEYWORD

nonn


AUTHOR

N. J. A. Sloane


EXTENSIONS

Corrected and extended by Jud McCranie, Jan 03 2001
Terms up to a(307) in bfile from Sean A. Irvine, Apr 20 2014
a(0) prepended and a(308)a(329) added to bfile by Max Alekseyev, Apr 24 2019


STATUS

approved



