OFFSET
1,1
LINKS
Robert Price, Table of n, a(n) for n = 1..7
Joe McLean, Interesting Sources of Probable Primes
OpenPFGW Project, Primality Tester
FORMULA
a = (A082671(n)!-2)/2.
EXAMPLE
6! / 2 - 1 = 359, which is prime, so 359 is in the sequence.
7! / 2 - 1 = 2519 = 11 * 229, so 2519 is not in the sequence.
MATHEMATICA
Select[Table[k! / 2 - 1, {k, 2, 100}], PrimeQ[#]&]
CROSSREFS
KEYWORD
nonn
AUTHOR
Robert Price, Jul 19 2017
STATUS
approved