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 A178002 #5 Mar 31 2012 10:26:16 %S A178002 7,47,449,4447,44449,444449,7444441,74444449,444444443,4444444447, %T A178002 44444444441,444444444443,5444444444443,84444444444449, %U A178002 494444444444441,8444444444444443,74444444444444441,494444444444444447 %N A178002 Largest n-digit prime with the most digits equal to 4. %C A178002 Select first for most 4's, then take the largest. %Y A178002 Cf. A037061, A105980, A099658 %K A178002 nonn,base %O A178002 1,1 %A A178002 _Lekraj Beedassy_, May 17 2010