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 A061954 #17 Mar 08 2020 21:36:47
%S A061954 1,3,5,9,15,21,96,99,259,1317,2112,52711,72483,124069,633696,651632,
%T A061954 2391984,4317312,8101536,8344672
%N A061954 Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 25 (most significant digit on right).
%C A061954 This sequence differs from A029518 in that all least significant zeros are removed before concatenation.
%C A061954 No more terms < 10^7. [_Lars Blomberg_, Oct 26 2011]
%H A061954 <a href="/index/N#concat">Index entries for related sequences</a>
%e A061954 See A061931 for example.
%t A061954 b = 25; c = {}; Select[Range[10^4], Divisible[FromDigits[c = Join[c, IntegerDigits[IntegerReverse[#, b], b]], b], #] &] (* _Robert Price_, Mar 08 2020 *)
%Y A061954 Cf. A029447-A029470, A029471-A029494, A029495-A029518, A029519-A029542, A061931-A061954, A061955-A061978.
%K A061954 nonn,base,more
%O A061954 1,2
%A A061954 Larry Reeves (larryr(AT)acm.org), May 24 2001
%E A061954 Edited and updated by Larry Reeves (larryr(AT)acm.org), Apr 12 2002
%E A061954 a(15)-a(20) from _Lars Blomberg_, Oct 26 2011