

A051857


Numbers n such that (n!)^2n!+1 is prime.


0




OFFSET

1,1


COMMENTS

a(1)a(9) are verified primes using BLS option in pfgw.  Robert Price, Aug 24 2014
a(10) > 15000.  Robert Price, Aug 24 2014


LINKS

Table of n, a(n) for n=1..9.
C. K. Caldwell, The Prime Pages
C. Nash, Prime Form [?Broken link]
M. Oakes, Re: Gaussian primorial and factorial primes, Primeform, Dec 21 2010
Mike Oakes, Andrew Walker, David Broadhurst, Gaussian primorial and factorial primes, digest of 7 messages in primeform Yahoo group, Dec 20  Dec 21, 2010.


PROG

(PARI) isok(n) = isprime((n!)^2n!+1); \\ Michel Marcus, Aug 26 2013


CROSSREFS

Cf. A002981, A002982, A046029, A051856.
Sequence in context: A202263 A153014 A100891 * A050654 A336447 A215157
Adjacent sequences: A051854 A051855 A051856 * A051858 A051859 A051860


KEYWORD

nonn,hard,more


AUTHOR

Andrew Walker (ajw01(AT)uow.edu.au), Dec 13 1999


EXTENSIONS

a(7)a(9) from Robert Price, Aug 24 2014


STATUS

approved



