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 A198880 #10 Feb 07 2025 17:44:38
%S A198880 1,2,2,7,0,1,7,2,0,7,3,5,2,9,2,2,0,8,9,7,2,2,1,9,9,7,0,8,1,9,5,4,2,6,
%T A198880 9,3,5,0,5,9,4,3,6,1,8,6,6,4,7,8,5,9,0,8,7,7,5,9,0,6,7,3,2,8,0,3,4,6,
%U A198880 9,4,7,4,0,9,0,7,4,1,8,7,9,6,7,6,4,3,2,1,5,2,1,1,7,2,0,6,3,2,7
%N A198880 Decimal expansion of x>0 satisfying 2*x^2-3*cos(x)=2.
%C A198880 See A198755 for a guide to related sequences. The Mathematica program includes a graph.
%H A198880 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A198880 1.227017207352922089722199708195426935059...
%t A198880 a = 2; b = -3; c = 2;
%t A198880 f[x_] := a*x^2 + b*Cos[x]; g[x_] := c
%t A198880 Plot[{f[x], g[x]}, {x, -2, 2}, {AxesOrigin -> {0, 0}}]
%t A198880 r = x /. FindRoot[f[x] == g[x], {x, 1.2, 1.3}, WorkingPrecision -> 110]
%t A198880 RealDigits[r] (* A198880 *)
%Y A198880 Cf. A198755.
%K A198880 nonn,cons
%O A198880 1,2
%A A198880 _Clark Kimberling_, Oct 31 2011