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 A198983 #9 Feb 07 2025 17:58:21
%S A198983 7,5,3,4,3,4,9,3,9,2,5,8,6,6,6,2,5,2,6,7,6,9,5,1,9,9,5,8,3,1,5,6,3,3,
%T A198983 0,0,4,9,9,5,8,8,7,4,9,7,1,2,5,9,0,8,3,5,1,2,8,2,4,8,1,9,9,0,3,5,7,3,
%U A198983 3,5,3,5,3,3,9,7,4,7,2,4,9,5,5,8,0,7,3,5,8,2,5,3,2,1,5,9,3,5,4
%N A198983 Decimal expansion of x>0 satisfying 4*x^2+cos(x)=3.
%C A198983 See A198755 for a guide to related sequences. The Mathematica program includes a graph.
%H A198983 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A198983 0.753434939258666252676951995831563300...
%t A198983 a = 4; b = 1; c = 3;
%t A198983 f[x_] := a*x^2 + b*Cos[x]; g[x_] := c
%t A198983 Plot[{f[x], g[x]}, {x, -2, 2}, {AxesOrigin -> {0, 0}}]
%t A198983 r = x /. FindRoot[f[x] == g[x], {x, .75, .76}, WorkingPrecision -> 110]
%t A198983 RealDigits[r] (* A198983 *)
%Y A198983 Cf. A198755.
%K A198983 nonn,cons
%O A198983 0,1
%A A198983 _Clark Kimberling_, Nov 01 2011