OFFSET
1,3
COMMENTS
n!8 = A114800(n).
See also links in A156165.
For odd k, n!k +-2 is even for all n > k and thus cannot be prime.
a(60) > 50000. - Robert Price, Aug 19 2012
LINKS
C. Caldwell and H. Dubner (Eds): The top ten prime numbers: from the unpublished collections of R. Ondrejka (May 2001), Table 21 F, p. 75.
Ken Davis, Status of Search for Multifactorial Primes.
MATHEMATICA
Select[Range[0, 9999], PrimeQ[Product[# - 8i, {i, 0, Floor[(# - 2)/8]}] + 2] &] (* Indranil Ghosh, Mar 13 2017 *)
PROG
(PARI) for(n=0, 9999, isprime(prod(i=0, (n-2)\8, n-8*i)+2)& print1(n", "))
CROSSREFS
KEYWORD
nonn,hard
AUTHOR
M. F. Hasler, Jan 17 2012
EXTENSIONS
a(39)-a(59) from Robert Price, Aug 19 2012
STATUS
approved