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 A304047 #4 May 05 2018 12:38:41 %S A304047 1,30,52,166,369,20369,35504 %N A304047 Numbers k such that A003105(k) is divisible by k. %C A304047 No other terms below 100000. %e A304047 166 is in the sequence because A003105(166) = 991020 = 5970 * 166. %Y A304047 Cf. A003105. %K A304047 nonn,more %O A304047 1,2 %A A304047 _Vaclav Kotesovec_, May 05 2018