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 A014962 #19 Jul 02 2021 01:57:27 %S A014962 1,3,9,21,27,63,81,93,147,171,189,243,279,441,513,567,609,651,729,837, %T A014962 903,1029,1197,1323,1539,1701,1827,1953,2187,2511,2667,2709,2883,2943, %U A014962 3087,3249,3591,3969,4263,4401,4557,4617,5103,5301,5481,5859,6321 %N A014962 Odd numbers k that divide 25^k - 1. %C A014962 Also, numbers k such that k divides s(k), where s(1)=1, s(j) = s(j-1) + j*25^(j-1). %C A014962 Equivalently, numbers k that divide ((24*k - 1)*25^k + 1) / 24^2 (cf. A014943). %H A014962 Robert Israel, <a href="/A014962/b014962.txt">Table of n, a(n) for n = 1..10000</a> %p A014962 select(t -> 25 &^ t - 1 mod t = 0, [seq(i,i=1..10^4,2)]); # _Robert Israel_, Oct 04 2020 %Y A014962 Cf. A014943, A014945, A014946, A014949, A014950, A014951, A014956, A014957, A128358, A128360, A014959, A014960. %K A014962 nonn %O A014962 1,2 %A A014962 _Olivier Gérard_ %E A014962 Edited by _Max Alekseyev_, Nov 16 2019