OFFSET
1,1
FORMULA
Equals (1/e + 4*sinh(1))/2.
Equals 2* 1F2(3;3/2,2;1/4) . - R. J. Mathar, Aug 02 2024
EXAMPLE
2.53434210787332407456252558627193206403434152818407...
MATHEMATICA
s = Sum[(k + 2)/(2 k + 1)!, {k, 0, Infinity}]
d = N[s, 100]
First[RealDigits[d]]
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, May 12 2024
STATUS
approved