A055490 Factorial primes: primes of the form n! - 1.

5, 23, 719, 5039, 479001599, 87178291199, 265252859812191058636308479999999, 263130836933693530167218012159999999, 8683317618811886495518194401279999999

Offset

1,1

Comments

For further information see A002982, which is the main entry.

Also primes of the form 1*1! + 2*2! + ... + n*n!. - Jonathan Vos Post, Jul 21 2006

Prime numbers that are the difference of two factorial numbers. - Juri-Stepan Gerasimov, Nov 08 2010

Links

T. D. Noe, Table of n, a(n) for n=1..12

Formula

p = n!-1 for some n given in A002982.

Mathematica

Select[Range[40]!-1, PrimeQ] (* Harvey P. Dale, Aug 16 2012 *)

Crossrefs

Cf. A000142, A000203, A002982.

Sequence in context: A172036 A003487 A361402 * A261935 A299360 A002811

Adjacent sequences: A055487 A055488 A055489 * A055491 A055492 A055493

Keyword

nonn

Author

Labos Elemer, Jun 28 2000

Extensions

Edited by Jon E. Schoenfield, Jan 09 2015

Status

approved