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 A102201 #12 Aug 14 2021 13:13:00 %S A102201 4,581,427,8621,16342,253486367,2219057821,27297112754,89359826467, %T A102201 111725421271,81491456587747,65683774724947682,3657883767310690921, %U A102201 324958155565178050832783011,7599185976546928443534740942821,3638796960899657009455220564046301 %N A102201 Iccanobirt semiprimes (11 of 15): Semiprime numbers in A102121. %F A102201 a(n) = A102121(A102181(n)). %Y A102201 Cf. A001358, A102121, A102181, A102191-A102205. %K A102201 nonn,less,base %O A102201 1,1 %A A102201 _Jonathan Vos Post_ and _Ray Chandler_, Dec 31 2004 %E A102201 Offset changed to 1 and a(16) from _Jinyuan Wang_, Aug 14 2021