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 A032686 #9 Jul 28 2021 04:23:56 %S A032686 1,4,5,7,10,20,23,25,26,28,29,40,44,47,49,50,61,64,70,71,73,77,80,83, %T A032686 92,94,101,109,118,130,134,137,139,149,152,154,158,164,172,173,178, %U A032686 181,191,196,199,212,214,215,220,230,232,239,241,248,262,263 %N A032686 Numbers k such that k surrounded by digit '1' is a lucky number. %Y A032686 Cf. A000959, A032682. %K A032686 nonn,base %O A032686 1,2 %A A032686 _Patrick De Geest_, May 15 1998