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 A029449 #14 Jul 04 2021 02:00:11
%S A029449 1,2,3,4,6,8,12,14,16,18,21,24,26,28,32,36,42,48,52,56,58,63,64,72,84,
%T A029449 96,108,126,128,144,147,168,189,192,216,252,256,276,328,362,384,456,
%U A029449 492,512,656,768,896,904,984,1024,1116,1152,1211,1251,1344,1536,1736
%N A029449 Numbers k that divide the (right) concatenation of all numbers <= k written in base 4 (most significant digit on left).
%H A029449 Robert Price, <a href="/A029449/b029449.txt">Table of n, a(n) for n = 1..134</a>
%t A029449 b = 4; c = {}; Select[Range[10^5], Divisible[FromDigits[c = Join[c, IntegerDigits[#, b]], b], #] &] (* _Robert Price_, Mar 10 2020 *)
%Y A029449 Cf. A007090.
%Y A029449 Cf. A029447-A029470, A029471-A029494, A029495-A029518, A029519-A029542, A061931-A061954, A061955-A061978.
%K A029449 nonn,base
%O A029449 1,2
%A A029449 _Olivier Gérard_