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 A198986 #8 Feb 07 2025 19:47:00
%S A198986 6,2,6,4,1,9,2,4,4,3,8,2,3,3,8,2,3,8,2,8,4,6,0,4,5,1,5,4,3,9,7,2,5,1,
%T A198986 1,8,6,0,0,3,3,3,2,8,8,8,3,2,6,8,4,1,3,0,5,5,6,8,1,9,0,2,6,2,2,5,1,8,
%U A198986 5,6,9,6,6,0,6,7,4,4,0,1,2,8,9,1,8,1,0,1,0,8,0,7,3,1,7,9,4,4,9
%N A198986 Decimal expansion of x>0 satisfying 4*x^2+3*cos(x)=4.
%C A198986 See A198755 for a guide to related sequences. The Mathematica program includes a graph.
%H A198986 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A198986 0.626419244382338238284604515439725118600333...
%t A198986 a = 4; b = 3; c = 4;
%t A198986 f[x_] := a*x^2 + b*Cos[x]; g[x_] := c
%t A198986 Plot[{f[x], g[x]}, {x, -2, 2}, {AxesOrigin -> {0, 0}}]
%t A198986 r = x /. FindRoot[f[x] == g[x], {x, .62, .63}, WorkingPrecision -> 110]
%t A198986 RealDigits[r] (* A198986 *)
%Y A198986 Cf. A198755.
%K A198986 nonn,cons
%O A198986 0,1
%A A198986 _Clark Kimberling_, Nov 01 2011