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 A113579 #6 Feb 07 2014 17:55:02 %S A113579 13,137,13711,137119,137119111,13711911133,1371191113399, %T A113579 1371191113399717,1371191113399717151,1371191113399717151383, %U A113579 1371191113399717151383969,13711911133997171513839693003,137119111339971715138396930033663,137119111339971715138396930033663141 %N A113579 Primes arising in A113578 as concatenation of terms. %Y A113579 Cf. A113577, A113578. %K A113579 base,nonn %O A113579 1,1 %A A113579 _Amarnath Murthy_, Nov 06 2005 %E A113579 Corrected and extended by _Michel Marcus_, Feb 07 2014