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 A201531 #10 Jan 30 2025 15:44:00
%S A201531 1,4,2,9,1,8,2,7,3,2,5,9,7,0,1,8,3,6,7,8,2,0,2,8,8,4,2,1,5,7,3,7,9,3,
%T A201531 6,7,4,4,7,8,9,8,1,0,4,4,9,0,6,9,1,5,7,0,5,8,8,2,4,0,5,5,3,2,6,6,7,4,
%U A201531 1,7,8,6,3,0,7,4,4,3,1,6,8,3,5,3,2,4,0,7,4,8,1,0,3,5,6,5,8,0,4
%N A201531 Decimal expansion of x satisfying 2*x^2 + 3 = sec(x) and 0 < x < Pi.
%C A201531 See A201397 for a guide to related sequences. The Mathematica program includes a graph.
%H A201531 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A201531 1.42918273259701836782028842157379367447...
%t A201531 a = 2; c = 3;
%t A201531 f[x_] := a*x^2 + c; g[x_] := Sec[x]
%t A201531 Plot[{f[x], g[x]}, {x, 0, Pi/2}, {AxesOrigin -> {0, 0}}]
%t A201531 r = x /. FindRoot[f[x] == g[x], {x, 1.4, 1.5}, WorkingPrecision -> 110]
%t A201531 RealDigits[r] (* A201531 *)
%Y A201531 Cf. A201397.
%K A201531 nonn,cons
%O A201531 1,2
%A A201531 _Clark Kimberling_, Dec 02 2011