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 A111472 #4 Dec 05 2013 19:57:05 %S A111472 199,199777,1997773333,19977733332929292929, %T A111472 19977733332929292929191919191919, %U A111472 1997773333292929292919191919191921212121212121,1997773333292929292919191919191921212121212121121121121121121121121121,1997773333292929292919191919191921212121212121121121121121121121121121777777777 %N A111472 Primes pertaining to A111471. %Y A111472 Cf. A111471. %K A111472 base,nonn %O A111472 1,1 %A A111472 _Amarnath Murthy_, Aug 05 2005 %E A111472 More terms from _Donovan Johnson_, Feb 26 2008