OFFSET
1,3
COMMENTS
This constant is transcendental.
FORMULA
Equals cosh(1/2).
Equals Product_{k>=0} 1 + 1/((2*k+1)*Pi)^2. - Amiram Eldar, Jul 16 2020
EXAMPLE
1/(2^0*0!) + 1/(2^2*2!) + 1/(2^4*4!) + ... = 1.1276259652063807852...
MATHEMATICA
RealDigits[Cosh[1/2], 10, 110] [[1]]
PROG
(PARI) cosh(1/2) \\ Michel Marcus, Apr 25 2020
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Ilya Gutkovskiy, Apr 24 2020
STATUS
approved