

A094144


Numbers n such that n!!  2 is prime.


16



5, 7, 15, 17, 19, 51, 73, 89, 131, 153, 245, 333, 441, 463, 825, 1771, 2027, 9157, 10875, 20515
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OFFSET

1,1


COMMENTS

a(21) > 50000.  Robert Price, Apr 14 2015


LINKS

Table of n, a(n) for n=1..20.
C. K. Caldwell, The Prime Glossary, multifactorial prime
C. Caldwell and H. Dubner (Eds): The top ten prime numbers: from the unpublished collections of R. Ondrejka (May 2001), Table 21 F, p. 75
Ken Davis, Status of Search for Multifactorial Primes.
Joe McLean, Interesting Sources of Probable Primes


MATHEMATICA

Select[Range[0, 50000], PrimeQ[#!!  2] &] (* Robert Price, Apr 14 2014 *)


CROSSREFS

Cf. A076185.
Sequence in context: A030755 A170827 A081965 * A031069 A050851 A058918
Adjacent sequences: A094141 A094142 A094143 * A094145 A094146 A094147


KEYWORD

nonn,changed


AUTHOR

Lekraj Beedassy, May 04 2004


EXTENSIONS

Corrected by Robert G. Wilson v, May 05 2004
More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 03 2008


STATUS

approved



