A123980 - OEIS

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A123980

Numbers k for which 8*k+1, 8*k+5 and 8*k+7 are primes.

12, 24, 57, 162, 234, 249, 267, 297, 432, 519, 564, 717, 969, 984, 1167, 1179, 1389, 1734, 2007, 2364, 2427, 2544, 2664, 2769, 2784, 3582, 3627, 3819, 3897, 4089, 4287, 5244, 5307, 5337, 5472, 5577, 5667, 5727, 5967, 6084, 6102, 6399, 6522, 6822, 6987

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

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

MATHEMATICA

Select[Range[7000], And @@ PrimeQ /@ ({1, 5, 7} + 8#) &] (* Ray Chandler, Nov 05 2006 *)

CROSSREFS

Cf. A005122, A005123, A005124, A105133.

Sequence in context: A090776 A247944 A346865 * A097704 A289132 A348716

Adjacent sequences: A123977 A123978 A123979 * A123981 A123982 A123983

KEYWORD

nonn

AUTHOR

Artur Jasinski, Oct 30 2006

EXTENSIONS

Extended by Ray Chandler, Nov 05 2006

STATUS

approved