The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A001271 Irregular table read by rows: row n lists prime factors of 10^n +1, with multiplicity. 3
 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 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. Makoto Kamada, Factorizations of 100...001. 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 Cf. A057934, A062397. Sequence in context: A243950 A056732 A157715 * A038371 A236174 A003021 Adjacent sequences:  A001268 A001269 A001270 * A001272 A001273 A001274 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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified January 21 22:55 EST 2020. Contains 331129 sequences. (Running on oeis4.)