A124041 Numbers k such that 2*k+1, 4*k+1 and 8*k+1 are primes.

9, 39, 165, 219, 249, 309, 414, 534, 639, 765, 1044, 1065, 1089, 1155, 1395, 1509, 1530, 1554, 1590, 1884, 2079, 2115, 2130, 2310, 2319, 2430, 2475, 2709, 2874, 3060, 3105, 3354, 3420, 3684, 3705, 3780, 3819, 4104, 4314, 4554, 4599, 4659, 4869, 5160

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

Mathematica

Select[3*Range[2000], And @@ PrimeQ /@ ({2, 4, 8}*# + 1) &] (* Ray Chandler, Dec 06 2006 *)

Crossrefs

Cf. A005097, A123998, A124412-A124417.

Sequence in context: A294845 A124851 A317019 * A264085 A126396 A246065

Adjacent sequences: A124038 A124039 A124040 * A124042 A124043 A124044

Keyword

nonn

Author

Artur Jasinski, Nov 02 2006

Status

approved