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 A198424 #8 Apr 23 2025 12:17:04
%S A198424 1,2,3,5,7,8,3,5,6,0,7,5,7,9,3,0,7,2,4,4,4,5,2,1,2,0,8,7,1,0,2,1,6,7,
%T A198424 4,7,7,2,9,5,5,4,8,5,0,7,7,5,8,3,8,0,7,8,1,4,0,0,7,5,1,8,7,2,5,9,5,9,
%U A198424 5,1,7,1,0,9,0,0,2,5,4,3,5,9,1,8,9,6,5,5,3,8,8,9,9,2,1,8,7,9,0
%N A198424 Decimal expansion of x>0 having x^2+2x=sin(x).
%C A198424 See A198414 for a guide to related sequences. The Mathematica program includes a graph.
%H A198424 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A198424 -1.2357835607579307244452120871021674772...
%t A198424 a = 1; b = 2; c = 1;
%t A198424 f[x_] := a*x^2 + b*x; g[x_] := c*Sin[x]
%t A198424 Plot[{f[x], g[x]}, {x, -2, 1}]
%t A198424 r = x /. FindRoot[f[x] == g[x], {x, -1.3, -1.2}, WorkingPrecision -> 110]
%t A198424 RealDigits[r] (* A198424 *)
%Y A198424 Cf. A198414.
%K A198424 nonn,cons
%O A198424 1,2
%A A198424 _Clark Kimberling_, Oct 25 2011