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 A201286 #10 Jan 30 2025 15:47:08
%S A201286 1,4,1,4,9,7,7,4,1,6,9,1,6,5,7,0,5,7,1,7,4,7,2,0,9,3,9,5,9,6,4,4,1,5,
%T A201286 4,3,0,4,1,0,8,6,7,7,3,7,8,8,2,8,6,9,3,0,1,6,2,1,6,3,2,7,8,3,6,8,8,2,
%U A201286 1,9,8,9,4,1,4,6,8,3,0,8,5,5,6,8,0,8,4,6,1,8,0,8,3,4,0,3,1,6,8
%N A201286 Decimal expansion of x satisfying x^2 + 7 = cot(x) and 0 < x < Pi.
%C A201286 See A201280 for a guide to related sequences. The Mathematica program includes a graph.
%H A201286 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A201286 0.141497741691657057174720939596441543041...
%t A201286 a = 1; c = 7;
%t A201286 f[x_] := a*x^2 + c; g[x_] := Cot[x]
%t A201286 Plot[{f[x], g[x]}, {x, 0, Pi/2}, {AxesOrigin -> {0, 0}}]
%t A201286 r = x /. FindRoot[f[x] == g[x], {x, .1, .2}, WorkingPrecision -> 110]
%t A201286 RealDigits[r] (* A201286 *)
%Y A201286 Cf. A201280.
%K A201286 nonn,cons
%O A201286 0,2
%A A201286 _Clark Kimberling_, Nov 29 2011