OFFSET
1,1
COMMENTS
For numbers k for which (9+k!)/9 is prime see A137390.
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..9
FORMULA
MATHEMATICA
a = {}; Do[If[PrimeQ[(n! + 9)/9], AppendTo[a, [(n! + 9)/9]], {n, 1, 150}]; a
Select[Range[100]!/9+1, PrimeQ] (* Harvey P. Dale, Aug 17 2017 *)
PROG
(PARI) for(n=6, 1e4, if(ispseudoprime(t=n!/9+1), print1(t", "))) \\ Charles R Greathouse IV, Jul 15 2011
CROSSREFS
KEYWORD
nonn
AUTHOR
Artur Jasinski, Apr 07 2008
STATUS
approved