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A085148 Numbers n such that n!!!!!+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 (list; graph; refs; listen; history; text; internal format)
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).

LINKS

Robert Price, Table of n, a(n) for n = 1..64

Ken Davis, Status of Search for Multifactorial Primes.

Ken Davis, Results for n!5+1.

CROSSREFS

Cf. A085157 (quintuple factorials), A085149.

Sequence in context: A285593 A248898 A207188 * A252169 A187842 A059566

Adjacent sequences:  A085145 A085146 A085147 * A085149 A085150 A085151

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

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Last modified August 20 11:39 EDT 2017. Contains 290835 sequences.