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 A198813 #8 Feb 07 2025 16:44:05
%S A198813 2,5,4,6,3,9,0,7,7,5,8,0,2,8,8,8,7,7,6,8,5,6,1,7,2,7,0,9,3,9,3,6,1,2,
%T A198813 8,9,5,0,3,7,3,3,5,1,2,3,1,9,1,4,5,9,0,3,8,1,8,4,1,2,9,9,7,9,3,4,1,7,
%U A198813 9,8,3,1,9,5,8,4,9,9,6,8,7,3,0,0,1,2,8,1,7,6,7,8,9,1,7,1,8,1,9
%N A198813 Decimal expansion of x>0 satisfying x^2+3*cos(x)=4.
%C A198813 See A198755 for a guide to related sequences. The Mathematica program includes a graph.
%H A198813 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A198813 x=2.5463907758028887768561727093936128950373...
%t A198813 a = 1; b = 3; c = 4;
%t A198813 f[x_] := a*x^2 + b*Cos[x]; g[x_] := c
%t A198813 Plot[{f[x], g[x]}, {x, -3, 3}, {AxesOrigin -> {0, 0}}]
%t A198813 r = x /. FindRoot[f[x] == g[x], {x, 2.5, 2.6}, WorkingPrecision -> 110]
%t A198813 RealDigits[r] (* A198813 *)
%Y A198813 Cf. A198755.
%K A198813 nonn,cons
%O A198813 1,1
%A A198813 _Clark Kimberling_, Oct 30 2011