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

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

Offset: 1

Author

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

Keywords

• nonn

Links

• C. K. Caldwell, The Prime Pages
• C. Nash, Prime Form [?Broken link]

Crossrefs

Cf. A002981, A002982, A046029.

Programs

Magma

[n: n in [1..300] | IsPrime(Factorial(n)^4+1)]; // Vincenzo Librandi, Aug 15 2013

Mathematica

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

PARI

isok(n) = isprime(n!^4 + 1); \\ Michel Marcus, Aug 15 2013

Extensions

a(9) from Robert Price, Jul 24 2014

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