A085150 Numbers k such that k!!!!!! + 1 is prime.

0, 1, 2, 4, 6, 8, 10, 12, 16, 18, 20, 22, 28, 40, 42, 44, 52, 66, 68, 78, 80, 92, 100, 102, 106, 210, 214, 232, 534, 676, 772, 822, 964, 1020, 1184, 1498, 2304, 2348, 7738, 9488, 11250, 12760, 12798, 25336, 27728, 35242, 41730, 46576, 55458, 73908, 94412, 99088

Offset: 1

Author

Hugo Pfoertner, Jun 23 2003

Keywords

• hard
• nonn

Comments

The search for multifactorial primes started by Ray Ballinger is now continued by a team of volunteers on the website of Ken Davis (see link).

Links

• Ken Davis, Status of Search for Multifactorial Primes.
• Ken Davis, Results for n!6+1.

Crossrefs

Cf. A085158 (sextuple factorials), A051592.

Extensions

More terms from Hugo Pfoertner, Aug 17 2004

Corrected and extended by Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 03 2008