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A085148
Numbers k such that k!!!!! + 1 is prime.
14
0, 1, 2, 4, 6, 9, 11, 13, 15, 17, 23, 26, 31, 32, 35, 36, 49, 52, 89, 92, 106, 120, 141, 149, 173, 201, 280, 289, 353, 455, 483, 499, 543, 811, 866, 1010, 1126, 1557, 2358, 2411, 2435, 2485, 2491, 2772, 2851, 2937, 2996, 3642, 3777, 4123, 4642, 5566, 6416, 9202, 9382
OFFSET
1,3
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).
CROSSREFS
Cf. A085157 (quintuple factorials), A085149.
Sequence in context: A351631 A248898 A207188 * A252169 A187842 A330000
KEYWORD
hard,nonn
AUTHOR
Hugo Pfoertner, Jun 23 2003
EXTENSIONS
More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 03 2008
a(56)-a(64), with a(62)-(64) from the Ken Davis link, added to b-file by Robert Price, Sep 23 2012
STATUS
approved