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 A197387 #16 Apr 10 2021 11:31:55
%S A197387 2,1,5,3,2,1,5,0,6,6,6,8,2,6,9,8,3,3,5,4,3,3,9,0,1,2,2,7,8,4,4,6,1,3,
%T A197387 4,8,4,2,9,2,6,1,6,3,2,0,4,9,1,8,4,6,4,1,3,8,6,0,7,7,3,3,0,9,6,6,2,0,
%U A197387 5,4,0,3,7,4,3,9,6,7,3,8,3,8,0,6,4,6,8,2,1,6,8,7,7,8,3,0,9,4
%N A197387 Decimal expansion of least x > 0 having sin(Pi*x/3) = sin(x/2)^2.
%C A197387 The Mathematica program includes a graph. See A197133 for a guide to least x > 0 satisfying sin(b*x) = sin(c*x)^2 for selected b and c.
%e A197387 x=2.15321506668269833543390122784461348429261632049...
%t A197387 b = Pi/3; c = 1/2; f[x_] := Sin[x]
%t A197387 t = x /. FindRoot[f[b*x] == f[c*x]^2, {x, 2, 2.5}, WorkingPrecision -> 200]
%t A197387 RealDigits[t] (* A197387 *)
%t A197387 Plot[{f[b*x], f[c*x]^2}, {x, 0, 3}]
%Y A197387 Cf. A197133.
%K A197387 nonn,cons
%O A197387 1,1
%A A197387 _Clark Kimberling_, Oct 14 2011
%E A197387 Incorrect term a(99) removed by _Andrew Howroyd_, Jan 17 2018