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 A033853 #13 Jul 20 2020 01:52:10 %S A033853 3,15,56,102,228,234,384,408,510,864,936,1092,1140,1170,1920,2040, %T A033853 4320,4680,5460 %N A033853 Integers k such that j(k)*d(k)=phi(k), where j = A033831. %C A033853 If it exists, a(20) > 10^9. - _Sean A. Irvine_, Jul 19 2020 %Y A033853 Cf. A000005 (d), A000010 (phi), A033831. %K A033853 nonn,more %O A033853 1,1 %A A033853 _Naohiro Nomoto_ %E A033853 a(17)-a(19) from _Sean A. Irvine_, Jul 19 2020