A290117 Primes of the form k! / 4 - 1.

5, 29, 179, 1259, 10079, 907199, 326918591999, 1600593426431999, 6463004184721244159999

Offset

1,1

Links

Robert Price, Table of n, a(n) for n = 1..9

Joe McLean, Interesting Sources of Probable Primes

OpenPFGW Project, Primality Tester

Formula

a(n) = (A139199(n)!-4)/4.

Mathematica

Select[Table[i! / 4 - 1, {i, 4, 100}], PrimeQ[#]&]

Crossrefs

Cf. A139174, A139199.

Sequence in context: A163073 A190802 A139174 * A153296 A194723 A190917

Adjacent sequences: A290114 A290115 A290116 * A290118 A290119 A290120

Keyword

nonn

Author

Robert Price, Jul 19 2017

Status

approved