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 A198496 #9 Apr 23 2025 12:33:59
%S A198496 5,2,2,4,3,6,6,0,9,3,9,9,3,5,1,4,3,9,8,1,5,3,5,6,9,0,7,8,8,9,5,7,8,2,
%T A198496 9,5,6,9,9,0,5,9,3,8,8,1,2,9,6,9,2,5,8,2,6,5,6,8,2,2,8,3,1,2,2,6,7,5,
%U A198496 9,9,7,2,1,7,4,6,6,5,4,4,8,9,2,9,0,6,1,4,1,7,1,8,6,6,4,9,5,7,0
%N A198496 Decimal expansion of x<0 having 2x^2+2x=sin(x).
%C A198496 See A198414 for a guide to related sequences. The Mathematica program includes a graph.
%H A198496 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A198496 -0.52243660939935143981535690788957829569905...
%t A198496 a = 2; b = 2; c = 1;
%t A198496 f[x_] := a*x^2 + b*x; g[x_] := c*Sin[x]
%t A198496 Plot[{f[x], g[x]}, {x, -1, 1}]
%t A198496 r = x /. FindRoot[f[x] == g[x], {x, -.53, -.52}, WorkingPrecision -> 110]
%t A198496 RealDigits[r] (* A198496 *)
%Y A198496 Cf. A198414.
%K A198496 nonn,cons
%O A198496 0,1
%A A198496 _Clark Kimberling_, Oct 25 2011