1,1

The next term is too large to include.

2^2-2!+1=4-2+1=3, 4^4-4!+1=256-24+1=233,..

The next term, a(5), has 527 digits and derives from n=224. - Harvey P. Dale, Jun 03 2014

Table of n, a(n) for n=1..4.

f[n_]:=n^n-n!+1; lst={}; Do[p=f[n]; If[PrimeQ[p], AppendTo[lst, p]], {n, 2*5!}]; lst

Select[Table[n^n-n!+1, {n, 30}], PrimeQ] (* Harvey P. Dale, Jun 03 2014 *)

Sequence in context: A159807 A065580 A072320 * A252585 A339751 A053970

Adjacent sequences: A162600 A162601 A162602 * A162604 A162605 A162606

nonn

Vladimir Joseph Stephan Orlovsky, Jul 07 2009

approved