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 A197586 #7 Dec 05 2018 17:37:48
%S A197586 3,2,2,6,4,7,7,6,3,7,7,3,4,2,4,5,9,2,6,8,1,3,8,9,6,3,4,5,6,9,9,0,8,0,
%T A197586 9,6,5,6,1,4,9,7,0,7,3,3,5,5,0,9,3,5,7,2,3,5,6,8,7,3,3,1,4,7,4,6,2,0,
%U A197586 8,2,0,4,1,8,1,6,7,0,3,1,6,7,3,1,3,9,0,3,7,4,6,7,0,1,3,1,1,5,4
%N A197586 Decimal expansion of least x>0 having cos(3*Pi*x) = (cos x)^2.
%C A197586 The Mathematica program includes a graph. See A197476 for a guide for the least x>0 satisfying cos(b*x)=(cos(c*x))^2 for selected b and c.
%e A197586 x=0.3226477637734245926813896345699080965614970733550...
%t A197586 b = 3*Pi; c = 1; f[x_] := Sin[x]
%t A197586 t = x /. FindRoot[f[b*x] == f[c*x]^2, {x, .32, .33}, WorkingPrecision -> 200]
%t A197586 RealDigits[t] (* A197586 *)
%t A197586 Plot[{f[b*x], f[c*x]^2}, {x, 0, Pi}]
%Y A197586 Cf. A197133.
%K A197586 nonn,cons
%O A197586 0,1
%A A197586 _Clark Kimberling_, Oct 16 2011