OFFSET
1,1
COMMENTS
If negative n are also admitted, the sequence changes to 11, 17, 47, 59, 109, 127, 197, 311,... [From R. J. Mathar, May 02 2010]
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Table[13*n^2+3*n+1, {n, 0, 300}], PrimeQ] (* Vincenzo Librandi, Jul 26 2012 *)
PROG
(Magma) [ a: n in [0..250] | IsPrime(a) where a is 13*n^2+3*n+1 ]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Apr 26 2010
STATUS
approved