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 A014949 Numbers n such that n divides 8^n - 1. 12
 1, 7, 49, 343, 889, 2359, 2401, 6223, 16513, 16807, 43561, 112903, 115591, 117649, 299593, 304927, 790321, 794983, 809137, 823543, 2033143, 2097151, 2134489, 5532247, 5564881, 5663959, 5764801, 13549249, 14232001, 14338681, 14680057, 14941423, 34591207, 38048311, 38725729 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS For all k, 7^k is in the sequence. - Benoit Cloitre, Mar 05 2002 From Alexander Adamchuk, May 16 2010: (Start) 7 divides a(n) for n>1. Prime divisors of a (n) in the order of their first appearance are {7, 127, 337, 2287, 15241, 14407, 18199, 42463, ...}. (End) LINKS M. F. Hasler, Table of n, a(n) for n = 1..64 PROG (PARI) is(n)=Mod(8, n)^n==1 \\ Charles R Greathouse IV, Nov 04 2016 CROSSREFS Sequence in context: A216129 A057266 A057833 * A228738 A057845 A269617 Adjacent sequences:  A014946 A014947 A014948 * A014950 A014951 A014952 KEYWORD nonn AUTHOR EXTENSIONS More terms from Benoit Cloitre, Mar 05 2002 a(15)-a(31) from Alexander Adamchuk, May 16 2010 More terms from M. F. Hasler, Nov 21 2018 STATUS approved

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Last modified April 20 17:54 EDT 2019. Contains 322310 sequences. (Running on oeis4.)