A290047 Primes in A290046.

2, 45181, 6290021506693847759, 25266964023001914822246560759, 10384129888710330539039375199241

Offset: 1

Author

XU Pingya, Jul 19 2017

Keywords

• easy
• nonn
• fini
• full

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.

Examples

			45181 = |0!! - 3!! + 6!! - 9!! + 12!!| is prime.
		

Crossrefs

Cf. A006882, A071828, A290046.

Programs

Mathematica

Select[#, PrimeQ] &@ Table[Abs@ Sum[(-1)^k*(3 k)!!, {k, 0, n}], {n, 0, 30}] (* Michael De Vlieger, Jul 19 2017 *)