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 A198836 #8 Feb 07 2025 16:44:05
%S A198836 6,3,8,9,2,0,6,5,7,6,0,4,5,9,4,5,3,8,9,0,8,2,5,7,4,6,2,6,4,4,2,5,9,6,
%T A198836 7,6,3,0,1,0,5,8,0,6,6,0,6,3,6,8,8,9,0,7,7,5,8,0,5,9,9,7,0,7,7,5,5,8,
%U A198836 6,4,2,4,9,9,7,3,0,0,3,0,7,6,4,7,7,5,5,4,3,0,0,7,7,1,2,0,5,2,6
%N A198836 Decimal expansion of x>0 satisfying x^2-3*cos(x)=-2.
%C A198836 See A198755 for a guide to related sequences. The Mathematica program includes a graph.
%H A198836 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A198836 0.63892065760459453890825746264425967630...
%t A198836 a = 1; b = -3; c = -2;
%t A198836 f[x_] := a*x^2 + b*Cos[x]; g[x_] := c
%t A198836 Plot[{f[x], g[x]}, {x, -3, 3}, {AxesOrigin -> {0, 0}}]
%t A198836 r = x /. FindRoot[f[x] == g[x], {x, .63, .64}, WorkingPrecision -> 110]
%t A198836 RealDigits[r] (* A198836 *)
%Y A198836 Cf. A198755.
%K A198836 nonn,cons
%O A198836 0,1
%A A198836 _Clark Kimberling_, Oct 30 2011