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 A197412 #12 Apr 10 2021 13:18:47
%S A197412 3,2,8,1,3,7,2,2,9,5,3,1,1,0,4,9,8,9,9,4,2,4,7,9,8,3,5,4,8,3,9,6,1,9,
%T A197412 2,2,0,2,2,6,2,0,6,6,2,9,3,8,6,2,2,6,7,8,2,6,3,8,5,7,0,6,9,2,5,6,4,6,
%U A197412 8,4,3,8,5,9,1,0,5,5,0,5,4,3,1,2,1,6,5,0,7,0,0,5,7,5,8,2,0,4,2
%N A197412 Decimal expansion of least x > 0 having sin(Pi*x/4) = sin(x/4)^2.
%C A197412 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 A197412 x=3.281372295311049899424798354839619220...
%t A197412 b = Pi/4; c = 1/4; f[x_] := Sin[x]
%t A197412 t = x /. FindRoot[f[b*x] == f[c*x]^2, {x, 3.2, 3.5}, WorkingPrecision -> 200]
%t A197412 RealDigits[t] (* A197412 *)
%t A197412 Plot[{f[b*x], f[c*x]^2}, {x, 0, 2*Pi}]
%Y A197412 Cf. A197133.
%K A197412 nonn,cons
%O A197412 1,1
%A A197412 _Clark Kimberling_, Oct 14 2011