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 A127550 #5 Nov 21 2013 12:49:02
%S A127550 3,1,9,4,5,1,3,2,4,2,7,3,6,1,9,3,3,1,2,8,9,0,9,8,1,0,5,3,4,5,0,5,5,1,
%T A127550 7,8,4,3,8,3,9,7,4,3,9,3,1,9,7,1,1,8,1,9,3,8,2,6,7,1,9,6,9,3,3,5,4,6,
%U A127550 9,1,2,2,5,3,6,4,2,7,6,2,6,7,5,9,5,7,8,7,6,9,8,6,5,6,1,4,7,3,3,4
%N A127550 Decimal expansion of the number 3.19451324273619331289098105345... having continued fraction expansion 3, 5, 7, 11, 13, 17, 19, ... (successive odd primes).
%t A127550 a = {}; Do[AppendTo[a, Prime[n]], {n, 2, 100}]; RealDigits[N[FromContinuedFraction[a], 100]][[1]]
%t A127550 RealDigits[FromContinuedFraction[Prime[Range[2,40]]],10,120][[1]] (* _Harvey P. Dale_, Mar 25 2012 *)
%Y A127550 Cf. A064442, A127549, A127551, A127552, A127553, A127555.
%K A127550 cons,nonn
%O A127550 1,1
%A A127550 _Artur Jasinski_, Jan 18 2007