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 A198234 #8 Feb 07 2025 16:44:05
%S A198234 1,2,8,8,3,8,9,2,3,7,3,2,2,8,2,6,9,2,0,4,4,6,9,5,3,7,6,1,9,8,4,1,5,2,
%T A198234 6,3,6,5,4,6,9,2,7,5,3,7,0,8,5,4,5,5,9,2,9,1,2,6,9,9,7,2,0,6,3,6,3,3,
%U A198234 2,7,2,4,5,6,6,2,9,8,9,2,8,5,0,3,6,9,9,0,3,4,9,0,3,7,6,8,8,6,0
%N A198234 Decimal expansion of least x having 3*x^2+3x=4*cos(x).
%C A198234 See A197737 for a guide to related sequences. The Mathematica program includes a graph.
%e A198234 least x: -1.28838923732282692044695376198415263654...
%e A198234 greatest x: 0.646435567527722588379133828108743889...
%t A198234 a = 3; b = 3; c = 4;
%t A198234 f[x_] := a*x^2 + b*x; g[x_] := c*Cos[x]
%t A198234 Plot[{f[x], g[x]}, {x, -2, 1}]
%t A198234 r1 = x /. FindRoot[f[x] == g[x], {x, -1.3, -1.2}, WorkingPrecision -> 110]
%t A198234 RealDigits[r1](* A198234 *)
%t A198234 r2 = x /. FindRoot[f[x] == g[x], {x, .64, .65}, WorkingPrecision -> 110]
%t A198234 RealDigits[r2](* A198235 *)
%Y A198234 Cf. A197737.
%K A198234 nonn,cons
%O A198234 1,2
%A A198234 _Clark Kimberling_, Oct 23 2011