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 A029487 #31 Jun 29 2024 10:51:25
%S A029487 1,17,49,73,289,307,1297,3013,8959,664831,1399549,5122561,8515193,
%T A029487 11012719,65998063,145256891,294363959,734746001,1255837139,
%U A029487 1454498597,5287956641
%N A029487 Numbers k that divide the (left) concatenation of all numbers <= k written in base 18 (most significant digit on left).
%C A029487 No other terms below 3*10^10.
%H A029487 <a href="/index/N#concat">Index entries for related sequences</a>
%t A029487 b = 18; c = {}; Select[Range[10^4], Divisible[FromDigits[c = Join[IntegerDigits[#, b], c], b], #] &] (* _Robert Price_, Mar 12 2020 *)
%Y A029487 Cf. A029447-A029470, A029471-A029486, A029488-A029494, A029495-A029518, A029519-A029542, A061931-A061954, A061955-A061978.
%K A029487 nonn,base,more
%O A029487 1,2
%A A029487 _Olivier Gérard_
%E A029487 More terms from Andrew Gacek (andrew(AT)dgi.net), Feb 21 2000
%E A029487 a(9) corrected by Larry Reeves (larryr(AT)acm.org), Jan 14 2002
%E A029487 Edited and updated by Larry Reeves (larryr(AT)acm.org), Apr 12 2002
%E A029487 a(10)-a(15) from _Max Alekseyev_, May 15 2011
%E A029487 a(16)-a(21) from _Jason Yuen_, Jun 29 2024