OFFSET
1,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Range[400], PrimeQ[9# - 4] &] (* Vincenzo Librandi, Sep 26 2012 *)
PROG
(Magma) [n: n in [1..300] | IsPrime(9*n-4)]; // Vincenzo Librandi, Nov 19 2010
(PARI) is(n)=isprime(9*n-4) \\ Charles R Greathouse IV, Jun 06 2017
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved