OFFSET
1,1
COMMENTS
EXAMPLE
41 = |0!! - 2!! + 4!! - 6!!| is prime.
MATHEMATICA
Select[Table[Abs@ Sum[(-1)^k*(2 k)!!, {k, 0, n}], {n, 0, 60}], PrimeQ] (* Michael De Vlieger, Jul 19 2017 *)
CROSSREFS
KEYWORD
nonn,fini,full
AUTHOR
XU Pingya, Jul 19 2017
STATUS
approved