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A290045 Primes in A290044. 0
7, 41, 176075177, 49127973630377 (list; graph; refs; listen; history; text; internal format)
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.
LINKS
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
Sequence in context: A144747 A176090 A183064 * A188066 A225327 A102532
KEYWORD
nonn,fini,full
AUTHOR
XU Pingya, Jul 19 2017
STATUS
approved

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Last modified June 14 07:34 EDT 2024. Contains 373393 sequences. (Running on oeis4.)