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

Author

Robert Price, Jun 24 2015

Keywords

• hard
• more
• nonn

Comments

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

a(29) > 50000.

Links

• Joe McLean, Interesting Sources of Probable Primes

Crossrefs

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

Programs

Mathematica

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