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 A200689 #8 Feb 07 2025 16:44:07
%S A200689 1,2,8,1,3,6,9,9,1,6,6,2,1,1,5,5,8,6,8,0,9,8,5,7,6,9,0,4,5,3,4,8,9,4,
%T A200689 9,8,9,6,2,9,2,2,9,3,1,0,2,9,1,2,0,6,0,3,0,1,7,2,7,7,1,0,8,9,2,9,2,0,
%U A200689 3,2,2,9,6,1,0,7,0,5,1,3,1,9,8,6,7,5,5,1,1,3,0,5,0,3,4,4,7,0,3
%N A200689 Decimal expansion of least x>0 satisfying 5-x^2=tan(x).
%C A200689 See A200614 for a guide to related sequences. The Mathematica program includes a graph.
%H A200689 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A200689 1.2813699166211558680985769045348949896292293...
%t A200689 a = -1; c = 5;
%t A200689 f[x_] := a*x^2 + c; g[x_] := Tan[x]
%t A200689 Plot[{f[x], g[x]}, {x, -.1, Pi/2}, {AxesOrigin -> {0, 0}}]
%t A200689 r = x /. FindRoot[f[x] == g[x], {x, 1.2, 1.3}, WorkingPrecision -> 110]
%t A200689 RealDigits[r] (* A200689 *)
%Y A200689 Cf. A200338.
%K A200689 nonn,cons
%O A200689 1,2
%A A200689 _Clark Kimberling_, Nov 21 2011