OFFSET
1,1
FORMULA
Equals Product_{k>=1} (1 + 1/(2*k - 1)^2).
Equals Product_{k>=0} (1 + 1/A016754(k)).
EXAMPLE
2.50917847865805678200999564326940594821202435...
MATHEMATICA
RealDigits[Cosh[Pi/2], 10, 120][[1]]
PROG
(PARI) cosh(Pi/2) \\ Michel Marcus, Jun 20 2019
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Ilya Gutkovskiy, Jun 19 2019
STATUS
approved