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 A029485 #29 Jun 29 2024 10:51:55
%S A029485 1,3,5,9,15,25,75,257,321,435,795,1285,2313,8523,39759,60855,91209,
%T A029485 247875,251385,2695341,5095725,9529505,12179807,12341125,57965805,
%U A029485 1380206235,15616692345,22548618825,26313971049
%N A029485 Numbers k that divide the (left) concatenation of all numbers <= k written in base 16 (most significant digit on left).
%C A029485 No other terms below 3*10^10.
%H A029485 <a href="/index/N#concat">Index entries for related sequences</a>
%e A029485 For k=3, we have 321_16 which is 801, and 801 = 3*267.
%t A029485 b = 16; c = {}; Select[Range[10^4], Divisible[FromDigits[c = Join[IntegerDigits[#, b], c], b], #] &] (* _Robert Price_, Mar 12 2020 *)
%Y A029485 Cf. A029447-A029470, A029471-A029484, A029486-A029494, A029495-A029518, A029519-A029542, A061931-A061954, A061955-A061978.
%K A029485 nonn,base,more
%O A029485 1,2
%A A029485 _Olivier Gérard_
%E A029485 More terms from Andrew Gacek (andrew(AT)dgi.net), Feb 21 2000
%E A029485 More terms from Larry Reeves (larryr(AT)acm.org), Aug 27 2001
%E A029485 Edited and updated by Larry Reeves (larryr(AT)acm.org), Apr 12 2002
%E A029485 a(20)-a(25) from _Max Alekseyev_, May 15 2011
%E A029485 a(26)-a(29) from _Jason Yuen_, Jun 29 2024