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A290045
Primes in A290044.
0
7, 41, 176075177, 49127973630377
OFFSET
1,1
COMMENTS
For n < 20, A290044(n) are prime when n = {2, 3, 9, 13}.
For n >= 20, 19|A290044(n). Therefore there are only 4 terms in this sequence.
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