OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..5000
MATHEMATICA
Select[Table[9n^2+4, {n, 0, 1000}], PrimeQ]
PROG
(Magma) [a: n in [0..300] | IsPrime(a) where a is 9*n^2+4];
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Dec 04 2011
STATUS
approved