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 A199373 #8 Feb 07 2025 16:44:05
%S A199373 5,8,8,5,9,1,4,1,0,8,1,7,1,5,4,5,0,6,4,3,1,7,7,3,6,2,3,7,1,2,7,8,6,7,
%T A199373 0,5,4,4,1,7,7,2,9,6,6,5,6,1,2,7,9,9,0,6,4,8,0,6,0,5,9,6,1,9,5,6,4,5,
%U A199373 9,4,8,1,3,4,2,1,9,5,0,8,3,2,0,1,2,6,3,1,4,5,2,9,6,9,4,7,6,5,9
%N A199373 Decimal expansion of x>0 satisfying x^2+2*x*sin(x)=1.
%C A199373 See A199370 for a guide to related sequences. The Mathematica program includes a graph.
%H A199373 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A199373 0.58859141081715450643177362371278670544...
%t A199373 a = 1; b = 2; c = 1;
%t A199373 f[x_] := a*x^2 + b*x*Sin[x]; g[x_] := c
%t A199373 Plot[{f[x], g[x]}, {x, -1, Pi}, {AxesOrigin -> {0, 0}}]
%t A199373 r = x /. FindRoot[f[x] == g[x], {x, .58, .59}, WorkingPrecision -> 110]
%t A199373 RealDigits[r] (* A199373 *)
%Y A199373 Cf. A199370.
%K A199373 nonn,cons
%O A199373 0,1
%A A199373 _Clark Kimberling_, Nov 05 2011