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 A102156 #11 Aug 12 2021 03:31:22 %S A102156 2,7,13,499,943819,8512981, %T A102156 75957608989028496534122437859061890223391739 %N A102156 Iccanobirt primes (6 of 15): Prime numbers in A102116. %C A102156 Next term is too large to include. %F A102156 a(n) = A102116(A102136(n)). %Y A102156 Cf. A000040, A102116, A102151-A102165. %K A102156 nonn,base,less %O A102156 1,1 %A A102156 _Jonathan Vos Post_ and _Ray Chandler_, Dec 31 2004 %E A102156 Offset changed to 1 by _Jinyuan Wang_, Aug 12 2021