OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Prime[Range[250]], Mod[#, 30]==19||Mod[#, 30]==11&] (* Harvey P. Dale, Dec. 28, 2010 *)
Select[Prime[Range[210]], MemberQ[{11, 19}, Mod[#, 30]]&] (* Vincenzo Librandi, Aug 15 2012 *)
PROG
(Magma) [p: p in PrimesUpTo(3000)|p mod 30 in {11, 19}]; // Vincenzo Librandi, Dec 18 2010
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Juri-Stepan Gerasimov, Jul 28 2008
EXTENSIONS
Corrected by Charles R Greathouse IV, Mar 25 2010
STATUS
approved