Smallest primitive factor of 10^n -1. Also smallest prime p such that 1/p has repeating decimal expansion of period n.
3, 11, 37, 101, 41, 7, 239, 73, 333667, 9091, 21649, 9901, 53, 909091, 31, 17
1 seqfan posts
Fri Nov 19 01:06:42 CET 2010 [seqfan] Re: extending A179192 (periods of 1/n)