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 A102180 #16 Aug 14 2021 12:51:55 %S A102180 5,15,18,29,30,31,32,33,44,46,59,84,95,97,98,136,154,203,207,245,262, %T A102180 291,323,340,362 %N A102180 Iccanobirt semiprime indices (10 of 15): Indices of semiprime numbers in A102120. %F A102180 A102120(a(n)) = A102200(n). %Y A102180 Cf. A001358, A102120, A102171-A102185, A102200. %K A102180 nonn,more,less,base %O A102180 1,1 %A A102180 _Jonathan Vos Post_ and _Ray Chandler_, Dec 31 2004 %E A102180 a(18)-a(20) from _Robert Price_, Nov 10 2018 %E A102180 Offset changed to 1 and a(21)-a(25) from _Jinyuan Wang_, Aug 14 2021