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 A198881 #12 Feb 07 2025 17:45:02
%S A198881 1,3,5,1,4,4,2,8,9,2,9,4,2,0,7,9,0,4,9,6,9,5,5,5,4,7,8,0,3,6,6,3,0,4,
%T A198881 9,3,9,3,8,3,1,2,2,1,3,0,4,4,0,7,7,3,5,6,5,6,4,7,3,3,3,3,7,1,0,7,8,7,
%U A198881 7,5,6,4,7,4,0,7,7,8,2,4,5,5,0,3,3,3,5,1,8,6,3,6,9,3,6,7,6,7,1,5,7
%N A198881 Decimal expansion of x>0 satisfying 2*x^2-3*cos(x)=3.
%C A198881 See A198755 for a guide to related sequences. The Mathematica program includes a graph.
%H A198881 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A198881 1.351442892942079049695554780366304939383122...
%t A198881 a = 2; b = -3; c = 3;
%t A198881 f[x_] := a*x^2 + b*Cos[x]; g[x_] := c
%t A198881 Plot[{f[x], g[x]}, {x, -2, 2}, {AxesOrigin -> {0, 0}}]
%t A198881 r = x /. FindRoot[f[x] == g[x], {x, 1.35, 1.36}, WorkingPrecision -> 110]
%t A198881 RealDigits[r] (* A198881 *)
%Y A198881 Cf. A198755.
%K A198881 nonn,cons
%O A198881 1,2
%A A198881 _Clark Kimberling_, Oct 31 2011