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 A181438 #4 May 01 2013 21:13:46
%S A181438 7,8,0,2,2,6,3,2,4,9,4,7,5,9,9,4,3,7,6,3,7,4,2,7,9,5,3,7,1,8,9,4,7,1,
%T A181438 8,8,6,0,2,3,0,0,8,8,8,4,5,8,1,7,1,8,1,8,8,6,8,2,5,4,7,6,0,0,3,9,6,1,
%U A181438 0,8,9,1,0,3,2,5,7,0,4,0,9,2,9,7,6,2,0,2,3,6,4,7,1,3,9,6,4,0,5,3,3,6,3,4,5
%N A181438 Let x_0, x_1, ... be the real zeros of Sum_{m>=1} mu(m)*x^(m-1); sequence gives decimal expansion of -x_1.
%e A181438 -0.780226324947...
%Y A181438 Cf. A008683, A181439.
%K A181438 cons,nonn
%O A181438 0,1
%A A181438 _Mats Granvik_, Oct 23 2010
%E A181438 Partially edited by _N. J. A. Sloane_, Oct 23 2010.
%E A181438 More digits from _R. J. Mathar_, Oct 26 2010