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 A046294 #12 Oct 13 2019 23:14:08
%S A046294 108,146,161,191,208,222,230,249,258,260,272,308,313,322,325,332,350,
%T A046294 358,381,386,389,391,401,408,416,422,430,464,470,484,487,500,508,525,
%U A046294 533,534,541,547,560,583,587,599,608,615,628,641,649,653,663,676,689
%N A046294 Numbers k such that 2^k contains 2^8=256 as its largest proper substring of the form 2^m.
%e A046294 2^108 = 324518553658426726783156020576{256}.
%Y A046294 Cf. A033921.
%K A046294 nonn,base
%O A046294 1,1
%A A046294 _Patrick De Geest_, Jun 15 1998