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A001271
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Irregular table read by rows: row n lists of factors of 10^n +1.
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1
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2, 11, 101, 7, 11, 13, 73, 137, 11, 9091, 101, 9901, 11, 909091, 17, 5882353, 7, 11, 13, 19, 52579, 101, 3541, 27961, 11, 11, 23, 4093, 8779, 73, 137, 99990001, 11, 859, 1058313049, 29, 101, 281, 121499449, 7, 11, 13, 211, 241, 2161, 9091, 353, 449, 641, 1409, 69857
(list;
graph;
refs;
listen;
history;
text;
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.
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LINKS
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Table of n, a(n) for n=0..50.
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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EXAMPLE
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Table begins:
2,
11,
101,
7,11,13,
73,137,
11,9091,
101,9901,
11,909091,
17,5882353,
...
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CROSSREFS
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Sequence in context: A220433 A056732 A157715 * A038371 A003021 A097463
Adjacent sequences: A001268 A001269 A001270 * A001272 A001273 A001274
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KEYWORD
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nonn,tabf
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AUTHOR
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N. J. A. Sloane.. Revised Jul 13 2009.
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EXTENSIONS
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Term ordering corrected by Sean A. Irvine, Apr 11 2012
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STATUS
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approved
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