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 A123980 Numbers k for which 8*k+1, 8*k+5 and 8*k+7 are primes. 1
 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: A080495 A090776 A247944 * A097704 A289132 A098585 Adjacent sequences:  A123977 A123978 A123979 * A123981 A123982 A123983 KEYWORD nonn,changed AUTHOR Artur Jasinski, Oct 30 2006 EXTENSIONS Extended by Ray Chandler, Nov 05 2006 STATUS approved

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Last modified April 3 14:34 EDT 2020. Contains 333197 sequences. (Running on oeis4.)