A001270 Table of prime factors of 10^n - 1 (with multiplicity).
3, 3, 3, 3, 11, 3, 3, 3, 37, 3, 3, 11, 101, 3, 3, 41, 271, 3, 3, 3, 7, 11, 13, 37, 3, 3, 239, 4649, 3, 3, 11, 73, 101, 137, 3, 3, 3, 3, 37, 333667, 3, 3, 11, 41, 271, 9091, 3, 3, 21649, 513239, 3, 3, 3, 7, 11, 13, 37, 101, 9901, 3, 3, 53, 79, 265371653
Offset: 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.
Links
- Max Alekseyev, Rows n = 1..352, flattened
- J. Brillhart et al., Factorizations of b^n +- 1, Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 3rd edition, 2002.
- Makoto Kamada, Factorizations of 11...11 (Repunit).
- S. S. Wagstaff, Jr., The Cunningham Project
Crossrefs
Cf. A002283.
Programs
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Mathematica
Table[f = FactorInteger[10^n - 1]; Flatten[Table[Table[i[[1]], {i[[2]]}], {i, f}]], {n, 13}] (* T. D. Noe, Jun 27 2012 *)
Extensions
Erroneous b-file replaced by Ray Chandler, Apr 26 2017
b-file corrected and extended with rows 323..352 by Max Alekseyev, May 23 2023
Comments