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 A102178 #13 Aug 14 2021 07:13:38 %S A102178 5,9,11,16,17,18,20,30,31,41,43,54,68,69,84,135,139,174,188,191,203, %T A102178 207,243,301,356 %N A102178 Iccanobirt semiprime indices (8 of 15): Indices of semiprime numbers in A102118. %F A102178 A102118(a(n)) = A102198(n). %Y A102178 Cf. A001358, A102118, A102171-A102185, A102198. %K A102178 nonn,more,less,base %O A102178 1,1 %A A102178 _Jonathan Vos Post_ and _Ray Chandler_, Dec 31 2004 %E A102178 a(21)-a(22) from _Robert Price_, Nov 09 2018 %E A102178 Offset changed to 1 and a(23)-a(25) from _Jinyuan Wang_, Aug 14 2021