This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A014956 #21 Jun 06 2021 06:26:56
%S A014956 1,13,169,2041,2197,26533,28561,114413,320437,344929,371293,1487369,
%T A014956 4165681,4484077,4826809,17962841,19335797,24355253,50308609,54153853,
%U A014956 58293001,62748517,77457601,233516933,249302027,251365361,316618289
%N A014956 Positive integers k such that k divides 14^k - 1.
%C A014956 Also, positive integers k such that k divides A014929(k).
%C A014956 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
%C A014956 Prime divisors of a(n) in order of appearance: {13, 157, 677, 11933, 122147, 52807, ...}. - _Alexander Adamchuk_, May 16 2010
%t A014956 Join[{1}, Select[Range[2000000], PowerMod[14, #, #] == 1 &]] (* _Robert Price_, Mar 31 2020 *)
%Y A014956 Cf. A067945, A014945, A067946, A014946, A067947, A014949, A068382, A014950, A068383, A014951, A116621, A177805, A014957, A177807, A128358, A128360.
%Y A014956 Cf. A177914, A128394.
%K A014956 nonn
%O A014956 1,2
%A A014956 _Olivier Gérard_
%E A014956 2 more terms from _R. J. Mathar_, Mar 05 2008
%E A014956 a(8)-a(23) from _Alexander Adamchuk_, May 14 2010
%E A014956 a(24)-a(44) from _Alexander Adamchuk_, May 16 2010
%E A014956 Edited by _Max Alekseyev_, Sep 10 2011