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 A014855 #11 Jul 03 2021 16:29:10 %S A014855 1,2,4,6,7,8,12,14,18,20,24,28,36,40,42,49,52,54,56,60,72,84,98,100, %T A014855 104,108,114,120,126,136,140,156,162,168,180,196,200,216,220,228,252, %U A014855 260,280,294,300,312,324,342,343,360,364,378,392,408,420,438,440,444 %N A014855 Numbers k that divide s(k), where s(1)=1, s(j)=8*s(j-1)+j. %Y A014855 s(n) = A014831(n). %K A014855 nonn %O A014855 1,2 %A A014855 _N. J. A. Sloane_, _Olivier Gérard_