A089678 Numbers n such that n^n + n! + n^2 + 1 is prime.

2, 3, 5, 1608

Offset

1,1

Comments

The prime corresponding to a(4) is a 5156-digit prime.

Links

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

Mathematica

v={}; Do[If[PrimeQ[n^n + n! + n*n + n/n], v=Append[v, n]; Print[v]], {n, 3250}]

Prog

(PARI) is(n)=ispseudoprime(n^n+n!+n^2+1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Cf. A084914, A084852.

Sequence in context: A046474 A056146 A115835 * A072712 A046476 A263429

Adjacent sequences: A089675 A089676 A089677 * A089679 A089680 A089681

Keyword

nonn

Author

Farideh Firoozbakht, Jan 06 2004

Status

approved