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 A198931 #8 Feb 07 2025 17:51:47
%S A198931 1,2,4,3,9,3,7,2,8,5,3,9,7,2,3,6,5,5,2,7,3,1,0,1,5,8,7,7,5,2,0,5,7,2,
%T A198931 2,0,1,5,4,5,8,8,8,2,7,1,2,2,5,1,0,8,3,3,3,5,6,6,5,6,5,3,1,9,9,4,7,9,
%U A198931 7,5,1,7,2,1,9,0,1,6,1,7,1,3,5,2,5,3,5,1,5,1,8,7,1,6,7,1,4,9,6
%N A198931 Decimal expansion of x>0 satisfying 3*x^2-2*cos(x)=4.
%C A198931 See A198755 for a guide to related sequences. The Mathematica program includes a graph.
%H A198931 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A198931 1.243937285397236552731015877520572201545888...
%t A198931 a = 3; b = -2; c = 4;
%t A198931 f[x_] := a*x^2 + b*Cos[x]; g[x_] := c
%t A198931 Plot[{f[x], g[x]}, {x, -2, 2}, {AxesOrigin -> {0, 0}}]
%t A198931 r = x /. FindRoot[f[x] == g[x], {x, 1.2, 1.3}, WorkingPrecision -> 110]
%t A198931 RealDigits[r] (* A198931 *)
%Y A198931 Cf. A198755.
%K A198931 nonn,cons
%O A198931 1,2
%A A198931 _Clark Kimberling_, Oct 31 2011