A076190 Numbers n such that n!! + 2^5 is prime.

5, 7, 9, 11, 15, 21, 33, 41, 43, 45, 67, 93, 117, 327, 363

Offset

1,1

Comments

a(16) > 50000. - Robert Price, Jan 02 2015

Links

Table of n, a(n) for n=1..15.

The OpenPFGW Project, Primality Tester

Mathematica

lst={}; Do[If[PrimeQ[n!!+2^5], AppendTo[lst, n]], {n, 0, 50000}]; lst
Select[Range[400], PrimeQ[#!!+32]&] (* Harvey P. Dale, Jul 22 2021 *)

Crossrefs

Cf. A006882, A080778 and A076185, A076186, A076188, A076189, A076193, A076194, A076195, A076196, A076197 for other values of s in n!! + 2^s.

Sequence in context: A086398 A356052 A023380 * A028885 A228233 A256091

Adjacent sequences: A076187 A076188 A076189 * A076191 A076192 A076193

Keyword

nonn,more

Author

Zak Seidov, Nov 02 2002

Extensions

Edited and checked (n<4096) by Hugo Pfoertner, Jun 19 2003

Status

approved