OFFSET
0,1
EXAMPLE
0.2674437781383544278798037561159253725...
PROG
(PARI) exp(sumpos(n=1, log(cos(Pi/(2*n+1))))) \\ Michel Marcus, Aug 29 2023
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
R. J. Mathar, Aug 29 2023
STATUS
approved