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 A014871 #18 Jul 03 2021 16:22:23
%S A014871 1,2,4,5,6,10,12,14,18,19,20,28,30,36,38,42,54,55,60,70,76,84,90,95,
%T A014871 98,108,110,114,126,140,156,162,180,190,196,210,220,228,252,266,270,
%U A014871 294,305,324,330,342,361,378,380,406,420,468,486,490,532,540,570,588
%N A014871 Numbers k that divide s(k), where s(1)=1, s(j)=20*s(j-1)+j.
%F A014871 {n: n | A014904(n)}. - _R. J. Mathar_, Jul 15 2010
%Y A014871 Cf. A014904.
%K A014871 nonn
%O A014871 1,2
%A A014871 _N. J. A. Sloane_, _Olivier Gérard_