OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Prime[Range[200]], PrimeQ[7 #^2 + 7 # - 1]&] (* Vincenzo Librandi, Apr 16 2013 *)
PROG
(Magma) [p: p in PrimesUpTo(1050) | IsPrime(7*p^2+7*p-1)]; // Vincenzo Librandi, Apr 16 2013
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Jan 26 2010
STATUS
approved