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 A046293 #13 Oct 13 2019 02:33:14
%S A046293 102,107,203,207,248,257,263,271,307,312,321,324,329,331,343,357,362,
%T A046293 385,390,429,458,469,486,491,524,535,546,553,568,569,586,607,614,625,
%U A046293 627,633,634,640,648,651,662,665,668,675,688,695,702,707,711,712,715
%N A046293 Numbers k such that 2^k contains 2^7=128 as its largest proper substring of the form 2^m.
%e A046293 2^102 = 50706024009129176059868{128}21504.
%Y A046293 Cf. A033921.
%K A046293 nonn,base
%O A046293 1,1
%A A046293 _Patrick De Geest_, Jun 15 1998