OFFSET
1,2
FORMULA
Equals -2 + 3*cos(1) + 2*sin(1).
EXAMPLE
1.3038488872202121655078144655895278104420573...
MATHEMATICA
s = Sum[(-1)^k (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