OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Prime[Range[2500]], MemberQ[{21}, Mod[#, 55]] &] (* Vincenzo Librandi, Aug 31 2012 *)
PROG
(Magma) [p: p in PrimesUpTo(16000) | p mod 55 eq 21]; // Vincenzo Librandi, Aug 31 2012
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Jul 11 2008
STATUS
approved