A365256 Decimal expansion of Product_{n>=1} cos(Pi/(2*n+1)).

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

Offset

0,1

Links

Table of n, a(n) for n=0..89.

Formula

this * A365255 = A085365.

Example

0.2674437781383544278798037561159253725...

Prog

(PARI) exp(sumpos(n=1, log(cos(Pi/(2*n+1))))) \\ Michel Marcus, Aug 29 2023

Crossrefs

Cf. A085365, A365255.

Sequence in context: A065488 A016591 A021793 * A377969 A327558 A265180

Adjacent sequences: A365253 A365254 A365255 * A365257 A365258 A365259

Keyword

nonn,cons

Author

R. J. Mathar, Aug 29 2023

Status

approved