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 A142960 #5 Oct 04 2012 16:26:24 %S A142960 1,1,2,3,223 %N A142960 Number of digits in the primes associated with A142959. %K A142960 nonn,base %O A142960 1,3 %A A142960 _Lekraj Beedassy_, Jul 13 2008