OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
FORMULA
a(n) ~ 2n log n. - Charles R Greathouse IV, Aug 07 2012
MATHEMATICA
Select[Prime[Range[300]], MemberQ[{2, 3, 4}, Mod[#, 7]]&] (* Vincenzo Librandi, Aug 07 2012 *)
PROG
(Magma) [ p: p in PrimesUpTo(600) | p mod 7 in {2, 3, 4} ]; // Vincenzo Librandi, Aug 07 2012
(PARI) select(n->n%7>1 && n%7<5, primes(60)) \\ Charles R Greathouse IV, Aug 07 2012
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved