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 A081777 #5 Mar 30 2012 18:39:16 %S A081777 1,8,1,8,9,8,1,8,8,1,8,8,1,7,1,8,8,1,8,9,8,1,8,8,1,7,1,8,9,8,1,8,8,1, %T A081777 7,1,8,8,1,8,8,1,8,9,8,1,8,8,1,7,1,8,9,8,1,8,8,1,8,8,1,7,1,8,8,1,8,9, %U A081777 8,1,7,1,8,8,1,8,9,8,1,8,8,1,7,1,8,8,1,8,8,1,8,9,8,1,8,8,1,7,1,8,9,8,1,8,8 %N A081777 Continued fraction for sum(k>=0,1/9^(2^k-1)). %C A081777 Contains only elements 1<=a(n)<=9 ( but 2,3,4,5 and 6 never occur) %Y A081777 Cf. A004200. %K A081777 cofr,nonn %O A081777 1,2 %A A081777 _Benoit Cloitre_, Apr 10 2003