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A085146 Numbers n such that n!!!!+1 is prime. 11
0, 1, 2, 4, 6, 18, 38, 56, 94, 118, 148, 286, 1358, 1480, 1514, 2680, 2846, 4078, 4288, 5612, 5680, 6440, 6586, 14614, 30972, 31690, 54406 (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

Table of n, a(n) for n=1..27.

Ken Davis, Status of Search for Multifactorial Primes.

Ken Davis, Results for n!4+1.

CROSSREFS

Cf. A007662 (quadruple factorials), A085147.

Sequence in context: A052930 A098853 A023149 * A066894 A233919 A111115

Adjacent sequences:  A085143 A085144 A085145 * A085147 A085148 A085149

KEYWORD

hard,nonn

AUTHOR

Hugo Pfoertner, Jun 25 2003

EXTENSIONS

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

STATUS

approved

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Last modified June 19 15:42 EDT 2021. Contains 345142 sequences. (Running on oeis4.)