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 A032689 #9 Jul 28 2021 04:24:20 %S A032689 1,2,7,8,16,19,20,23,35,37,43,44,50,56,67,68,71,73,82,83,89,91,94,101, %T A032689 103,104,115,127,134,151,154,155,157,161,169,199,212,215,218,227,232, %U A032689 257,260,268,272,278,289,290,299,301,308,311,317,319,322,337,338 %N A032689 Numbers k such that k surrounded by digit '7' is a lucky number. %Y A032689 Cf. A000959, A032684. %K A032689 nonn,base %O A032689 1,2 %A A032689 _Patrick De Geest_, May 15 1998