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 A111478 #3 Dec 05 2013 19:57:05 %S A111478 11,111919,111919191919,11191919191937373737, %T A111478 111919191919373737372121212121, %U A111478 111919191919373737372121212121717171717171,111919191919373737372121212121717171717171101101101101101101101 %N A111478 Primes pertaining to A111477. %e A111478 111919191919 = one copy of 11, two copies of 19, three copies of 19. %Y A111478 Cf. A111471, A111472, A111473, A111474, A111475, A111477. %K A111478 base,nonn %O A111478 1,1 %A A111478 _Amarnath Murthy_, Aug 05 2005 %E A111478 More terms from Tracy Poff (tracy.poff(AT)gmail.com), Dec 31 2005