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
KEYWORD
nonn
AUTHOR
Robert Price, Jul 19 2017
STATUS
approved