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 A181439 #4 May 01 2013 21:13:46
%S A181439 5,8,0,2,9,4,6,2,3,8,0,7,3,2,6,7,2,3,0,6,4,7,7,6,2,3,7,2,2,6,7,8,0,4,
%T A181439 3,6,6,4,9,4,6,4,9,4,1,5,0,1,2,9,2,6,1,5,1,3,7,3,3,1,9,6,0,0,7,5,9,3,
%U A181439 4,2,6,3,6,2,4,9,8,6,3,4,4,3,0,9,3,2,1,0,4,5,0,2,7,3,4,1,1,1,5,5,9,8,1,6,6
%N A181439 Let x_0, x_1, ... be the real zeros of Sum_{m>=1} mu(m)*x^(m-1); sequence gives decimal expansion of x_0.
%e A181439 0.58029462380732...
%Y A181439 Cf. A008683, A181438.
%K A181439 cons,nonn
%O A181439 0,1
%A A181439 _Mats Granvik_, Oct 23 2010
%E A181439 Partially edited by _N. J. A. Sloane_, Oct 23 2010.
%E A181439 More digits from _R. J. Mathar_, Oct 26 2010