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

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

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn

Comments

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

Crossrefs

Cf. A049433 (corresponding k), A090704.

Programs

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 *)