

A014956


Positive integers k such that k divides 14^k  1.


10



1, 13, 169, 2041, 2197, 26533, 28561, 114413, 320437, 344929, 371293, 1487369, 4165681, 4484077, 4826809, 17962841, 19335797, 24355253, 50308609, 54153853, 58293001, 62748517, 77457601, 233516933, 249302027, 251365361, 316618289
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OFFSET

1,2


COMMENTS

Also, positive integers k such that k divides A014929(k).
13 divides a(n) for n > 1. All powers of 13 are terms. All a(n) that are not powers of 13 are divisible either by 157 or 677 or both.  Alexander Adamchuk, May 14 2010
Prime divisors of a(n) in order of appearance: {13, 157, 677, 11933, 122147, 52807, ...}.  Alexander Adamchuk, May 16 2010


LINKS

Table of n, a(n) for n=1..27.


MATHEMATICA

Join[{1}, Select[Range[2000000], PowerMod[14, #, #] == 1 &]] (* Robert Price, Mar 31 2020 *)


CROSSREFS

Cf. A067945, A014945, A067946, A014946, A067947, A014949, A068382, A014950, A068383, A014951, A116621, A177805, A014957, A177807, A128358, A128360.
Cf. A177914, A128394.
Sequence in context: A245228 A093151 A188869 * A171287 A045593 A045597
Adjacent sequences: A014953 A014954 A014955 * A014957 A014958 A014959


KEYWORD

nonn


AUTHOR

Olivier Gérard


EXTENSIONS

2 more terms from R. J. Mathar, Mar 05 2008
a(8)a(23) from Alexander Adamchuk, May 14 2010
a(24)a(44) from Alexander Adamchuk, May 16 2010
Edited by Max Alekseyev, Sep 10 2011


STATUS

approved



