A173904 Numbers n such that 7*n+-1 are prime.

6, 60, 66, 126, 150, 156, 186, 204, 246, 276, 306, 324, 330, 384, 390, 480, 504, 546, 594, 606, 684, 774, 786, 840, 870, 876, 900, 936, 966, 1044, 1050, 1080, 1176, 1260, 1266, 1320, 1326, 1434, 1476, 1494, 1500, 1530, 1596, 1650, 1674, 1710, 1914, 1956

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Mathematica

Select[Range[2000], PrimeQ[7 # + 1]&& PrimeQ[7 # - 1]&] (* Vincenzo Librandi, Apr 05 2013 *)

Prog

(Magma) [n: n in [1..2000] | IsPrime(7*n+1) and IsPrime(7*n-1)]

Crossrefs

Sequence in context: A229097 A217399 A098185 * A308413 A204093 A136927

Adjacent sequences: A173901 A173902 A173903 * A173905 A173906 A173907

Keyword

nonn,easy

Author

Vincenzo Librandi, Mar 08 2010

Status

approved