OFFSET
0,1
FORMULA
Equals (23 - 3*sqrt(5))/22.
Equals Sum_{k>=0} cos(7 k*Pi/5)/2^k.
Minimal polynomial: 11 - 23 x + 11 x^2.
EXAMPLE
0.74053618488639231412602177244573...
MATHEMATICA
{b, m, h} = {2, 5, 3}; s = Sum[Cos[ h k Pi/m]/b^k, {k, 0, Infinity}]
d = N[s, 100]
First[RealDigits[d], 100]
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Jul 20 2024
STATUS
approved