OFFSET
2,3
COMMENTS
This constant is transcendental.
FORMULA
Equals Sum_{k>=0} Pi^(2*k)/(2*k)!.
Equals Product_{k>=0} (1 + 4/(2*k+1)^2).
Equals Product_{k>=1} (k^2 + 4)/(k^2 + 1). - Amiram Eldar, Aug 09 2020
EXAMPLE
(e^Pi + e^(-Pi))/2 = 11.5919532755215206277517520525601...
MATHEMATICA
RealDigits[Cosh[Pi], 10, 110] [[1]]
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Ilya Gutkovskiy, Apr 26 2020
STATUS
approved