OFFSET
1,1
FORMULA
Equals -4/e + 2 + 3*cosh(1) - 2*sinh(1).
Equals 2*2F3(1,3; 1/2,2,2; 1/4). - R. J. Mathar, Aug 02 2024
EXAMPLE
2.8073217524723591352868580804341...
MATHEMATICA
s = Sum[(k + 2)/((k + 1) (2 k)!), {k, 0, Infinity}]
d = N[s, 100]
First[RealDigits[d]]
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Apr 28 2024
STATUS
approved