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 A200390 #6 Feb 07 2025 16:44:07
%S A200390 1,4,8,8,5,8,4,1,5,4,5,8,6,8,7,1,3,8,9,6,6,6,1,6,4,5,2,9,2,8,9,8,6,4,
%T A200390 0,5,2,2,8,8,2,8,9,7,0,2,0,0,9,2,0,5,3,6,2,6,6,5,7,5,7,1,7,5,6,0,5,4,
%U A200390 2,8,6,0,1,0,2,2,3,9,3,0,6,2,6,1,9,1,7,0,8,8,2,2,4,5,6,2,8,2,1
%N A200390 Decimal expansion of least x>0 satisfying 3*x^2+x+4=tan(x).
%C A200390 See A200338 for a guide to related sequences. The Mathematica program includes a graph.
%e A200390 x=1.48858415458687138966616452928986405228828970200...
%t A200390 a = 3; b = 1; c = 4;
%t A200390 f[x_] := a*x^2 + b*x + c; g[x_] := Tan[x]
%t A200390 Plot[{f[x], g[x]}, {x, -.1, Pi/2}, {AxesOrigin -> {0, 0}}]
%t A200390 r = x /. FindRoot[f[x] == g[x], {x, 1.4, 1.5}, WorkingPrecision -> 110]
%t A200390 RealDigits[r] (* A200390 *)
%Y A200390 Cf. A200338.
%K A200390 nonn,cons
%O A200390 1,2
%A A200390 _Clark Kimberling_, Nov 17 2011