A187636 Primes of the form n^n-n!-n-1 (for n>=3).

17, 227, 2999, 16736887, 8915621446643, 302868879571439, 12089258196146290931146476752102265654388730403884105727999999959, 500702078263459319162123109657034815575847666330026847982736254730143917152403407

Offset

1,1

Comments

The 9th term of the sequence is 121 digits long and the 10th term has 146 digits.

Links

Table of n, a(n) for n=1..8.

Example

For n=3, p:=27-6-3-1=17 is prime.

Mathematica

Do[p=n^n-n!-n-1; If[PrimeQ[p], Print[p]], {n, 200}]
Select[Table[n^n-n!-n-1, {n, 3, 90}], PrimeQ] (* Harvey P. Dale, Apr 06 2018 *)

Crossrefs

Sequence in context: A087608 A078946 A164600 * A152588 A152589 A163853

Adjacent sequences: A187633 A187634 A187635 * A187637 A187638 A187639

Keyword

nonn

Author

Marco Ripà, Mar 12 2011

Status

approved