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 A200639 #10 Feb 07 2025 16:44:07
%S A200639 1,4,2,9,7,7,9,1,8,9,1,9,0,6,0,7,6,4,8,7,2,8,6,6,8,9,1,7,2,2,2,1,3,4,
%T A200639 2,4,9,2,0,7,9,5,2,2,5,8,4,8,0,0,0,2,9,9,9,7,5,0,4,0,7,7,4,9,5,6,6,3,
%U A200639 0,1,2,5,2,3,2,0,5,0,3,9,5,7,4,5,4,6,1,0,8,7,0,4,2,6,3,2,6,5,5,6
%N A200639 Decimal expansion of least x>0 satisfying x^2+5=tan(x).
%C A200639 See A200614 for a guide to related sequences. The Mathematica program includes a graph.
%H A200639 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A200639 1.42977918919060764872866891722213424920795225848000...
%t A200639 a = 1; c = -5;
%t A200639 f[x_] := a*x^2 - c; g[x_] := Tan[x]
%t A200639 Plot[{f[x], g[x]}, {x, -.1, Pi/2}, {AxesOrigin -> {0, 0}}]
%t A200639 r = x /. FindRoot[f[x] == g[x], {x, 1.41, 1.42}, WorkingPrecision -> 110]
%t A200639 RealDigits[r] (* A200639 *)
%Y A200639 Cf. A200338.
%K A200639 nonn,cons
%O A200639 1,2
%A A200639 _Clark Kimberling_, Nov 20 2011