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 A198886 #8 Feb 07 2025 17:46:12
%S A198886 1,3,7,4,6,7,5,3,4,3,9,3,4,6,8,1,8,9,9,6,3,0,1,5,6,6,5,7,3,2,3,7,5,8,
%T A198886 5,8,9,1,5,5,0,5,4,3,6,6,9,3,5,9,5,8,9,7,6,7,6,9,1,5,6,7,5,5,3,0,0,8,
%U A198886 7,2,4,4,1,6,2,5,1,9,5,0,2,1,1,8,2,2,1,4,1,0,3,3,4,2,1,6,8,5,6
%N A198886 Decimal expansion of x>0 satisfying 2*x^2-4*cos(x)=3.
%C A198886 See A198755 for a guide to related sequences. The Mathematica program includes a graph.
%H A198886 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A198886 1.374675343934681899630156657323758589155...
%t A198886 a = 2; b = -4; c = 3;
%t A198886 f[x_] := a*x^2 + b*Cos[x]; g[x_] := c
%t A198886 Plot[{f[x], g[x]}, {x, -2, 2}, {AxesOrigin -> {0, 0}}]
%t A198886 r = x /. FindRoot[f[x] == g[x], {x, 1.37, 1.38}, WorkingPrecision -> 110]
%t A198886 RealDigits[r] (* A198886 *)
%Y A198886 Cf. A198755.
%K A198886 nonn,cons
%O A198886 1,2
%A A198886 _Clark Kimberling_, Oct 31 2011