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 A200704 #9 Feb 07 2025 16:44:07
%S A200704 2,8,1,1,1,6,1,8,8,4,1,7,6,3,9,7,5,2,5,8,6,3,9,7,0,1,0,6,2,4,2,1,0,3,
%T A200704 6,1,5,1,8,0,0,5,4,6,2,2,9,0,8,2,6,0,6,0,1,6,4,9,2,0,8,7,8,2,1,5,5,7,
%U A200704 5,7,3,1,5,4,7,9,8,6,7,3,0,7,8,9,8,5,9,3,8,7,6,1,1,1,7,4,5,8,1
%N A200704 Decimal expansion of least x>0 satisfying 1-9*x^2=tan(x).
%C A200704 See A200614 for a guide to related sequences. The Mathematica program includes a graph.
%H A200704 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A200704 0.28111618841763975258639701062421036151800...
%t A200704 a = -9; c = 1;
%t A200704 f[x_] := a*x^2 + c; g[x_] := Tan[x]
%t A200704 Plot[{f[x], g[x]}, {x, -.1, Pi/2}, {AxesOrigin -> {0, 0}}]
%t A200704 r = x /. FindRoot[f[x] == g[x], {x, .2, .3}, WorkingPrecision -> 110]
%t A200704 RealDigits[r] (* A200704 *)
%Y A200704 Cf. A200338.
%K A200704 nonn,cons
%O A200704 0,1
%A A200704 _Clark Kimberling_, Nov 21 2011