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 A029537 #22 Jan 13 2025 13:24:08
%S A029537 1,19,27,67,269,399,5627,76439,269549,277951,424441
%N A029537 Numbers n such that n divides the (left) concatenation of all numbers <= n written in base 20 (most significant digit on right and removing all least significant zeros before concatenation).
%C A029537 This sequence differs from A061973 in that all least significant zeros are removed before concatenation.
%C A029537 No more terms < 10^7. [_Lars Blomberg_, Sep 25 2011]
%H A029537 <a href="/index/N#concat">Index entries for related sequences</a>
%e A029537 See A029519 for example.
%t A029537 b = 20; c = {}; Select[Range[10^4], Divisible[FromDigits[c = Join[IntegerDigits[IntegerReverse[#, b], b], c], b], #] &] (* _Robert Price_, Mar 13 2020 *)
%Y A029537 Cf. A029447-A029470, A029471-A029494, A029495-A029518, A029519-A029542, A061931-A061954, A061955-A061978.
%K A029537 nonn,base,more
%O A029537 1,2
%A A029537 _Olivier Gérard_
%E A029537 Edited and updated by Larry Reeves (larryr(AT)acm.org), Apr 12 2002
%E A029537 Additional comments and more terms from Larry Reeves (larryr(AT)acm.org), Jun 04 2001
%E A029537 a(11) from _Lars Blomberg_, Sep 25 2011