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 A201298 #10 Jan 30 2025 15:50:39
%S A201298 1,9,0,9,8,0,9,6,4,4,9,8,4,1,3,5,5,6,1,3,7,0,6,4,8,7,2,6,5,6,3,0,8,8,
%T A201298 0,2,5,4,6,4,7,7,1,4,0,3,0,1,0,8,4,6,0,5,2,4,9,2,9,5,2,8,7,8,8,0,3,5,
%U A201298 4,7,8,8,3,4,6,2,2,9,8,3,7,2,6,4,0,6,8,5,4,8,4,0,2,1,5,6,5,3,0
%N A201298 Decimal expansion of x satisfying x^2 - 4 = cot(x) and 0 < x < Pi.
%C A201298 See A201280 for a guide to related sequences. The Mathematica program includes a graph.
%H A201298 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A201298 1.90980964498413556137064872656308802546477...
%t A201298 a = 1; c = -4;
%t A201298 f[x_] := a*x^2 + c; g[x_] := Cot[x]
%t A201298 Plot[{f[x], g[x]}, {x, 0, Pi}, {AxesOrigin -> {0, 0}}]
%t A201298 r = x /. FindRoot[f[x] == g[x], {x, 1.9, 1.91}, WorkingPrecision -> 110]
%t A201298 RealDigits[r] (* A201298 *)
%Y A201298 Cf. A201280.
%K A201298 nonn,cons
%O A201298 1,2
%A A201298 _Clark Kimberling_, Nov 29 2011