A081713 n! - n# - 1 is prime, where n# is the primorial function.

4, 5, 20, 92, 106, 266, 308, 343, 583, 597, 903, 1021, 1239, 1314, 2458, 6160, 9627, 10649

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(1)=4 because 4!-4#-1=17 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. A081710, A081711, A081712.

Extensions

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