A049985 Primes of form n! - (n-1)! - 1.

3, 17, 599, 35279, 322559, 439084799, 293999475161295508340735999999

Offset

1,1

Comments

The next term has 116 digits. - Harvey P. Dale, Feb 17 2015

Links

Table of n, a(n) for n=1..7.

Mathematica

f[n_]:=n!-n; lst={}; Do[If[PrimeQ[f[n+1]-f[n]], AppendTo[lst, f[n+1]-f[n]]], {n, 0, 5!}]; lst (* Vladimir Joseph Stephan Orlovsky, Jun 27 2009 *)
Select[#[[2]]-#[[1]]-1&/@Partition[Range[100]!, 2, 1], PrimeQ] (* Harvey P. Dale, Feb 17 2015 *)

Crossrefs

For more terms see A049433.

Sequence in context: A001601 A061119 A094133 * A126579 A309060 A270816

Adjacent sequences: A049982 A049983 A049984 * A049986 A049987 A049988

Keyword

nonn

Author

N. J. A. Sloane

Status

approved