A081710 n! + n# + 1 is prime, where n# is the primorial function.

1, 2, 3, 4, 5, 6, 8, 17, 18, 24, 95, 96, 142, 1022, 1120, 1580, 6942, 19255, 19401

Offset: 1

Author

Mike Oakes, Apr 04 2003

Keywords

• nonn
• more
• hard

Comments

Some of the larger entries may only correspond to probable primes.

Examples

			a(2)=2 because 2!+2#+1=5 is prime
		

Links

• Mike Oakes, Primo-factorials.
• Mike Oakes, Primo-factorials, message 12028 in primenumbers Yahoo group, Apr 3, 2003. [Cached copy]
• Joe McLean, Interesting Sources of Probable Primes

Crossrefs

Cf. A081711, A081712, A081713.

Extensions

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 03 2008