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 A200645 #8 Feb 07 2025 16:44:07
%S A200645 1,5,2,2,9,2,5,8,1,4,4,6,9,9,6,5,5,3,7,6,7,3,6,6,4,3,8,7,6,6,5,1,9,9,
%T A200645 6,6,1,6,6,2,7,3,7,1,7,8,3,3,6,5,2,6,2,1,9,4,7,2,9,4,8,1,1,4,6,5,6,1,
%U A200645 4,2,5,9,5,1,2,3,6,9,4,1,8,7,8,9,0,3,2,4,3,4,6,7,3,6,3,4,5,1,5
%N A200645 Decimal expansion of least x>0 satisfying 9*x^2=tan(x).
%C A200645 See A200614 for a guide to related sequences. The Mathematica program includes a graph.
%H A200645 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A200645 1.5229258144699655376736643876651996616627371...
%t A200645 a = 9; c = 0;
%t A200645 f[x_] := a*x^2 - c; g[x_] := Tan[x]
%t A200645 Plot[{f[x], g[x]}, {x, -.1, Pi/2}, {AxesOrigin -> {0, 0}}]
%t A200645 r = x /. FindRoot[f[x] == g[x], {x, 1.52, 1.53}, WorkingPrecision -> 110]
%t A200645 RealDigits[r] (* A200645 *)
%Y A200645 Cf. A200338.
%K A200645 nonn,cons
%O A200645 1,2
%A A200645 _Clark Kimberling_, Nov 20 2011