OFFSET
0,1
FORMULA
Equals -2 + 3 cosh(1) - 2 sinh(1).
Equals 1F2(2; 3/2,3; 1/4)/4. - R. J. Mathar, Aug 02 2024
EXAMPLE
0.278839517158128421668953161079983417493...
MATHEMATICA
s = Sum[k/((k + 1) (2 k)!), {k, 0, Infinity}]
d = N[s, 100]
First[RealDigits[d]]
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, May 01 2024
STATUS
approved