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A259045 Numbers n such that n!! - 2^6 is prime. 1
7, 9, 11, 17, 21, 27, 29, 39, 43, 45, 67, 145, 173, 613, 833, 1449, 1703, 1719, 2673, 19661, 36095, 37837, 37845 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(24) > 50000.

LINKS

Table of n, a(n) for n=1..23.

C. K. Caldwell, The Prime Glossary, multifactorial prime

Joe McLean, Interesting Sources of Probable Primes

MATHEMATICA

Select[Range[0, 50000], #!! - 64 > 0 && PrimeQ[#!! - 64] &]

Select[Range[4, 6000], PrimeQ[#!! - 64] &] (* Vincenzo Librandi, Jun 18 2015 *)

CROSSREFS

Cf. A007749, A094144, A123910, A257864 (other forms of n!!-2^k)

Cf. A080778, A076185, A076186, A076188, A076189, A076190, A076193, A076194, A076195, A076196, A076197 (other forms of n!!+2^k)

Sequence in context: A107226 A252663 A317633 * A029611 A053357 A029634

Adjacent sequences:  A259042 A259043 A259044 * A259046 A259047 A259048

KEYWORD

nonn,hard,more

AUTHOR

Robert Price, Jun 17 2015

STATUS

approved

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Last modified April 5 11:18 EDT 2020. Contains 333239 sequences. (Running on oeis4.)