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 A102153 #6 Mar 30 2012 18:40:22 %S A102153 2,7,13,27283111,2758358381,20271711015483107, %T A102153 15021910462548628626464091829722269 %N A102153 Iccanobirt primes (3 of 15): Prime numbers in A102113. %C A102153 Next term is too large to include. %F A102153 a(n) = A102113(A102133(n)). %Y A102153 Cf. A000040, A102113, A102151-A102165. %K A102153 nonn,base %O A102153 1,1 %A A102153 _Jonathan Vos Post_ and _Ray Chandler_, Dec 31 2004