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 A198999 #10 Feb 07 2025 19:45:46
%S A198999 1,1,4,4,5,8,2,7,1,5,8,1,0,2,6,2,2,5,8,7,5,2,4,8,4,7,8,6,5,5,3,2,6,9,
%T A198999 1,6,3,1,7,5,0,6,3,0,6,4,9,6,1,6,0,6,2,2,9,9,0,1,9,0,9,7,6,1,1,7,9,6,
%U A198999 5,6,1,5,7,5,0,6,9,0,2,6,3,5,6,9,8,9,4,2,2,2,8,7,0,5,2,7,2,5,4
%N A198999 Decimal expansion of x>0 satisfying 4*x^2-3*cos(x)=4.
%C A198999 See A198755 for a guide to related sequences. The Mathematica program includes a graph.
%H A198999 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A198999 1.14458271581026225875248478655326916317506306496160...
%t A198999 a = 4; b = -3; c = 4;
%t A198999 f[x_] := a*x^2 + b*Cos[x]; g[x_] := c
%t A198999 Plot[{f[x], g[x]}, {x, -2, 2}, {AxesOrigin -> {0, 0}}]
%t A198999 r = x /. FindRoot[f[x] == g[x], {x, 1.4, 1.5}, WorkingPrecision -> 110]
%t A198999 RealDigits[r] (* A198999 *)
%Y A198999 Cf. A198755.
%K A198999 nonn,cons
%O A198999 1,3
%A A198999 _Clark Kimberling_, Nov 01 2011