A259359 Numbers n such that n!!-8 is prime.

5, 7, 9, 19, 41, 43, 83, 89, 91, 143, 299, 307, 341, 381, 585, 995, 1019, 1027, 2043, 4301, 6275, 11157, 11621, 12315, 17505, 24771, 30535, 38635

Offset

1,1

Comments

Corresponding primes are 7, 97, 937, 654729067, 13113070457687988603440617, ... .

a(29) > 50000.

Links

Table of n, a(n) for n=1..28.

Joe McLean, Interesting Sources of Probable Primes

Mathematica

Select[Range[5, 1000], PrimeQ[#!!-8]&]

Crossrefs

Cf. A006882, A007749, A094144, A123910, A258616.

Sequence in context: A124822 A072180 A162848 * A024571 A186406 A370138

Adjacent sequences: A259356 A259357 A259358 * A259360 A259361 A259362

Keyword

hard,more,nonn

Author

Robert Price, Jun 24 2015

Status

approved