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 A134731 #5 Jan 10 2013 07:08:29 %S A134731 3,7,3,1,1,2,7,8,1,9,1,1,3,1,0,7,1,5,2,4,2,8,7,2,1,4,7,4,8,3,6,4,7,2, %T A134731 3,0,5,8,4,3,0,0,9,2,1,3,6,9,3,9,5,1,6,1,8,9,7,0,0,1,9,6,4,2,6,9,0,1, %U A134731 3,7,4,4,9,5,6,2,1,1,1 %N A134731 Successive digits of Mersenne primes A000668(n). %C A134731 See A169684, A169681, A169685 for the digits of M(11)..M(13) separately. - _M. F. Hasler_, Jan 09 2013 %e A134731 Concatenate 3, 7, 31, 127, 8191, ... %Y A134731 Cf. A007376, A033308, A000668. %K A134731 easy,nonn,base %O A134731 1,1 %A A134731 _Omar E. Pol_, Nov 10 2007