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 A198823 #8 Feb 07 2025 16:44:05
%S A198823 1,6,7,2,4,4,1,3,0,4,8,7,3,5,2,9,5,1,3,4,3,2,9,6,0,4,5,2,0,8,9,4,0,1,
%T A198823 9,9,7,3,8,0,1,2,6,6,8,0,9,7,1,9,8,0,0,3,5,5,4,9,6,6,6,6,6,8,4,4,7,5,
%U A198823 4,7,0,2,4,8,4,3,7,1,3,1,3,4,3,3,9,0,1,4,0,8,7,2,2,7,5,5,4,2,2
%N A198823 Decimal expansion of x>0 satisfying x^2-2*cos(x)=3.
%C A198823 See A198755 for a guide to related sequences. The Mathematica program includes a graph.
%H A198823 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A198823 1.672441304873529513432960452089401997380126680...
%t A198823 a = 1; b = -2; c = 3;
%t A198823 f[x_] := a*x^2 + b*Cos[x]; g[x_] := c
%t A198823 Plot[{f[x], g[x]}, {x, -3, 3}, {AxesOrigin -> {0, 0}}]
%t A198823 r = x /. FindRoot[f[x] == g[x], {x, 1.6, 1.7}, WorkingPrecision -> 110]
%t A198823 RealDigits[r] (* A198823 *)
%Y A198823 Cf. A198755.
%K A198823 nonn,cons
%O A198823 1,2
%A A198823 _Clark Kimberling_, Oct 30 2011