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

2, 3, 5, 1608

Offset: 1

Author

Farideh Firoozbakht, Jan 06 2004

Keywords

• nonn

Comments

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

Crossrefs

Cf. A084914, A084852.

Programs

Mathematica

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

PARI

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