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A001271 Irregular table read by rows: row n lists prime factors of 10^n +1, with multiplicity. 4
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)
OFFSET
0,1
COMMENTS
Except for 2, all these primes are in A028416, and all the primes in A028416 appear here. - Davide Rotondo, Aug 12 2023
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.
LINKS
Ray Chandler, Rows n=0..310, flattened (from Kamada link)
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
EXAMPLE
Table begins:
2;
11;
101,
7, 11, 13;
73, 137;
11, 9091;
101, 9901;
11, 909091;
17, 5882353;
...
CROSSREFS
Sequence in context: A243950 A056732 A157715 * A038371 A236174 A003021
KEYWORD
nonn,tabf
AUTHOR
N. J. A. Sloane, revised Jul 13 2009
EXTENSIONS
Term ordering corrected by Sean A. Irvine, Apr 11 2012
Minor edits to description by Ray Chandler, May 02 2017
STATUS
approved

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Last modified May 18 15:56 EDT 2024. Contains 372664 sequences. (Running on oeis4.)