OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..4000
MATHEMATICA
Select[Prime[Range[2000]], PrimeQ[4# + 9]&] (* Vincenzo Librandi, Feb 02 2014 *)
PROG
(Magma) [n: n in [0..1000] | IsPrime(n) and IsPrime(4*n+9)]; // Vincenzo Librandi, Nov 19 2010
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved