A197493 Decimal expansion of least x > 0 having cos(x) = cos(Pi*x/2)^2.

1, 3, 2, 6, 9, 8, 0, 0, 9, 2, 1, 1, 3, 2, 7, 4, 6, 4, 1, 5, 7, 9, 6, 7, 2, 3, 3, 3, 8, 3, 0, 3, 8, 0, 4, 2, 6, 6, 4, 3, 0, 0, 6, 5, 5, 9, 2, 9, 1, 7, 3, 6, 1, 2, 0, 1, 8, 7, 8, 5, 5, 7, 7, 6, 3, 4, 2, 1, 8, 6, 5, 6, 9, 5, 8, 4, 3, 8, 9, 3, 8, 4, 7, 3, 2, 9, 4, 3, 5, 3, 6, 8, 0, 5, 2, 7, 7, 9, 0

Offset

1,2

Comments

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.

Links

Table of n, a(n) for n=1..99.

Example

x=1.32698009211327464157967233383038042664300...

Mathematica

b = 1; c = Pi/2; f[x_] := Cos[x]
t = x /. FindRoot[f[b*x] == f[c*x]^2, {x, 1.32, 1.33},
   WorkingPrecision -> 110]
RealDigits[t] (* A197493 *)
Plot[{f[b*x], f[c*x]^2}, {x, 0, 2}]

Crossrefs

Cf. A197476.

Sequence in context: A210754 A210738 A210601 * A300070 A171632 A245609

Adjacent sequences: A197490 A197491 A197492 * A197494 A197495 A197496

Keyword

nonn,cons

Author

Clark Kimberling, Oct 15 2011

Status

approved