OFFSET
1,2
COMMENTS
From Avik Roy (avik_3.1416(AT)yahoo.co.in), Feb 02 2009: (Start)
Only numbers of the form 6m+-2 can be included in this sequence.
All terms are evidently even and thus it can be concluded that 13n+3 can't be a prime if n itself is a prime greater than 2. (End)
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
MATHEMATICA
f[n_]:=13*n+3; lst={}; Do[p=f[n]; If[PrimeQ[p], AppendTo[lst, n]], {n, 0, 6!}]; lst (* Vladimir Joseph Stephan Orlovsky, Jul 01 2009 *)
Select[Range[0, 800], PrimeQ[13 # + 3] &] (* Vincenzo Librandi, Oct 15 2012 *)
PROG
(Magma) [n: n in [0..400] | IsPrime(13*n + 3)]; // Vincenzo Librandi, Oct 15 2012
(PARI) is(n)=isprime(13*n+3) \\ Charles R Greathouse IV, Aug 02 2018
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Jan 29 2009
EXTENSIONS
More terms from Vladimir Joseph Stephan Orlovsky, Jul 01 2009
STATUS
approved