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 A198873 #10 Feb 07 2025 16:44:05
%S A198873 1,2,8,1,6,3,0,3,8,6,1,5,9,9,6,2,1,1,0,4,2,9,9,0,6,6,7,9,6,2,0,0,1,9,
%T A198873 4,3,1,6,4,9,7,2,1,0,9,0,8,3,6,3,6,6,0,0,0,3,9,9,8,1,0,6,3,6,5,4,9,7,
%U A198873 4,9,4,3,3,8,4,3,5,8,0,8,9,7,3,4,3,4,0,6,8,2,8,6,1,1,4,6,0,0,4
%N A198873 Decimal expansion of x>0 satisfying 2*x^2-cos(x)=3.
%C A198873 See A198755 for a guide to related sequences. The Mathematica program includes a graph.
%H A198873 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A198873 1.28163038615996211042990667962001943164972109...
%t A198873 a = 2; b = -1; c = 3;
%t A198873 f[x_] := a*x^2 + b*Cos[x]; g[x_] := c
%t A198873 Plot[{f[x], g[x]}, {x, -2, 2}, {AxesOrigin -> {0, 0}}]
%t A198873 r = x /. FindRoot[f[x] == g[x], {x, 1.2, 1.3}, WorkingPrecision -> 110]
%t A198873 RealDigits[r] (* A198873 *)
%Y A198873 Cf. A198755.
%K A198873 nonn,cons
%O A198873 1,2
%A A198873 _Clark Kimberling_, Oct 31 2011