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 A178560 #2 Mar 31 2012 10:26:16 %S A178560 13,1223,3343,1044443,1555553,166616663,172777777,15888888887, %T A178560 9299999999 %N A178560 Smallest emirp using the digit n exactly n times. %Y A178560 Cf. A178559 %K A178560 fini,full,nonn,base %O A178560 1,1 %A A178560 _Lekraj Beedassy_, May 29 2010