A051855 - OEIS

A051855

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

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

LINKS

C. K. Caldwell, The Prime Pages

C. Nash, Prime Form [?Broken link]

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

KEYWORD

nonn

AUTHOR

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

EXTENSIONS

a(9) from Robert Price, Jul 24 2014

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

STATUS

approved