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 A134883 #9 Jun 12 2025 10:18:17
%S A134883 7,3,9,9,4,7,9,4,3,4,9,5,4,6,5,5,1,2,2,5,6,0,2,5,5,3,0,7,3,4,9,9,4,7,
%T A134883 8,2,0,5,6,1,1,0,6,6,5,7,4,2,2,4,3,9,6,2,8,7,4,5,4,5,6,5,1,9,9,9,8,0,
%U A134883 4,3,0,8,5,4,0,8,4,8,8,1,0,2,8,9,7,3,9,5,3,1,1,2,0,7,1,2,1,5,6,8,2,0,5,9
%N A134883 Decimal expansion of Sum_{n>=1} 1/(n^n+1).
%C A134883 Constant formed from sum of reversed Sierpinski numbers of first kind A014566.
%e A134883 0.7399479434954655122560255307349947820561106657422439628745456519998...
%t A134883 RealDigits[N[Sum[1/(n^n + 1), {n, 1, 150}], 100]][[1]] (* first zero removed *)
%Y A134883 Cf. A014566, A073009, A100085, A134877, A134878, A134879, A134880, A134881, A134882.
%K A134883 nonn,cons
%O A134883 0,1
%A A134883 _Artur Jasinski_, Nov 15 2007