OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
EXAMPLE
For n=2, 2*n+19 = 23 is prime, so 2 is in the sequence.
MATHEMATICA
Select[Prime[Range[2000]], PrimeQ[2 # + 19] &] (* Vincenzo Librandi, Oct 20 2012 *)
PROG
(Magma) [p: p in PrimesUpTo(1500) | IsPrime(2*p+19)];
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Dec 19 2008
EXTENSIONS
Edited, corrected and extended by Klaus Brockhaus, Dec 22 2008
STATUS
approved