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Search: id:A002592
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| A002592 |
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Largest prime factor of 9^n + 1.
(Formerly M3994 N1655)
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+0
2
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| 2, 5, 41, 73, 193, 1181, 6481, 16493, 21523361, 530713, 42521761, 570461, 769, 4795973261, 647753, 47763361, 926510094425921, 1743831169, 282429005041, 25480398173, 128653413121, 109688713, 56625998353, 70601370627701
(list; graph; listen)
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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 Th\'{e}orie des Nombres. Gauthiers-Villars, Paris, Vol. 1, 1924, Vol. 2, 1929, see Vol. 2, p. 89.
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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.
S. S. Wagstaff, Jr., The Cunningham Project
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MAPLE
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for n from 0 to 30 do t1:=ifactor(9^n+1); od;
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CROSSREFS
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Adjacent sequences: A002589 A002590 A002591 this_sequence A002593 A002594 A002595
Sequence in context: A004096 A106885 A072439 this_sequence A054553 A009457 A126469
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KEYWORD
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nonn
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AUTHOR
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njas
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