A051855 Numbers k such that (k!)^4+1 is prime.

0, 1, 2, 3, 4, 13, 112, 328, 11123

Offset

1,3

Links

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

Chris K. Caldwell, The PrimePages.

Chris Nash, Prime Form.

Mathematica

Select[Range[0, 350], PrimeQ[(#!)^4 + 1]&] (* Vincenzo Librandi, Aug 15 2013 *)

Prog

(PARI) isok(n) = isprime(n!^4 + 1); \\ Michel Marcus, Aug 15 2013
(Magma) [n: n in [1..300] | IsPrime(Factorial(n)^4+1)]; // Vincenzo Librandi, Aug 15 2013

Crossrefs

Cf. A002981, A002982, A046029.

Sequence in context: A295755 A089142 A123215 * A058070 A151413 A031241

Adjacent sequences: A051852 A051853 A051854 * A051856 A051857 A051858

Keyword

nonn,hard,more

Author

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

Extensions

a(9) from Robert Price, Jul 24 2014

a(1)=0 inserted by Robert Price, Sep 01 2014

Status

approved