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A290047
Primes in A290046.
0
2, 45181, 6290021506693847759, 25266964023001914822246560759, 10384129888710330539039375199241
OFFSET
1,1
COMMENTS
For n < 26, A290046(n) are primes when n = {1, 4, 11, 15, 16}.
For n >= 26, 41|A290046(n). Therefore there are only 5 terms in this sequence.
EXAMPLE
45181 = |0!! - 3!! + 6!! - 9!! + 12!!| is prime.
MATHEMATICA
Select[#, PrimeQ] &@ Table[Abs@ Sum[(-1)^k*(3 k)!!, {k, 0, n}], {n, 0, 30}] (* Michael De Vlieger, Jul 19 2017 *)
CROSSREFS
KEYWORD
easy,nonn,fini,full
AUTHOR
XU Pingya, Jul 19 2017
STATUS
approved