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 A242212 #16 May 10 2014 13:27:58 %S A242212 4,5,7,11,19,37,71,151,379,1051,3307,11483,44453 %N A242212 a(1) = 4. a(n) = A222209(a(n-1)). %C A242212 Question: what is the smallest composite number > 4 in this sequence? %Y A242212 Cf. A222208, A222209. %K A242212 more,nonn %O A242212 1,1 %A A242212 _J. Lowell_, May 07 2014 %E A242212 a(13) from _Alois P. Heinz_, May 07 2014