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 A198868 #8 Feb 07 2025 16:44:05
%S A198868 6,3,0,3,9,8,6,6,3,9,9,3,5,9,9,3,8,6,4,4,0,7,0,4,8,6,1,7,7,7,0,4,4,9,
%T A198868 9,2,6,7,8,5,0,2,5,1,7,0,1,8,1,0,1,7,6,8,6,5,4,9,2,6,9,1,3,0,8,5,9,5,
%U A198868 7,8,9,5,0,6,9,5,6,0,2,9,7,5,2,9,0,5,7,4,3,9,9,3,8,4,7,4,9,5,6
%N A198868 Decimal expansion of x>0 satisfying 3*x^2+cos(x)=2.
%C A198868 See A198755 for a guide to related sequences. The Mathematica program includes a graph.
%H A198868 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A198868 0.63039866399359938644070486177704499...
%t A198868 a = 3; b = 1; c = 2;
%t A198868 f[x_] := a*x^2 + b*Cos[x]; g[x_] := c
%t A198868 Plot[{f[x], g[x]}, {x, -2, 2}, {AxesOrigin -> {0, 0}}]
%t A198868 r = x /. FindRoot[f[x] == g[x], {x, .6, .7}, WorkingPrecision -> 110]
%t A198868 RealDigits[r] (* A198868 *)
%Y A198868 Cf. A198755.
%K A198868 nonn,cons
%O A198868 0,1
%A A198868 _Clark Kimberling_, Oct 31 2011