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 A178005 #5 Mar 31 2012 10:26:16 %S A178005 7,97,977,7877,97777,787777,7877777,77767777,787777777,8777777777, %T A178005 79777777777,777777779777,7877777777777,77777779777777, %U A178005 778777777777777,8777777777777777,77797777777777777,797777777777777777 %N A178005 Largest n-digit prime with the most digits equal to 7. %C A178005 Select first for the most 7's, then take the largest. %Y A178005 Cf. A037067, A105977 %K A178005 nonn,base %O A178005 1,1 %A A178005 _Lekraj Beedassy_, May 17 2010