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A173904 Numbers n such that 7*n+-1 are prime. 1
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified August 4 19:37 EDT 2020. Contains 336202 sequences. (Running on oeis4.)