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A139407
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Numbers k such that 8k+3 and 8k+7 are primes.
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1
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2, 5, 8, 20, 38, 47, 62, 80, 92, 107, 110, 113, 185, 197, 233, 260, 275, 293, 317, 332, 335, 338, 377, 395, 398, 488, 500, 653, 668, 722, 740, 755, 818, 863, 905, 950, 962, 965, 1052, 1055, 1067, 1097, 1100, 1193, 1202, 1217, 1223, 1235, 1262, 1280, 1283
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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MATHEMATICA
| a = {}; Do[If[PrimeQ[8 n + 3] && PrimeQ[8 n + 7], AppendTo[a, n]], {n, 1, 1000}]; a
Select[Range[1500], And@@PrimeQ[8 # +{3, 7}]&] (* From Harvey P. Dale, Mar 24 2011 *)
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CROSSREFS
| Cf. A001109, A125821, A125822, A139402, A139404, A139405, A139406.
Sequence in context: A127281 A054774 A104721 * A107384 A205596 A092446
Adjacent sequences: A139404 A139405 A139406 * A139408 A139409 A139410
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KEYWORD
| nonn
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AUTHOR
| Artur Jasinski (grafix(AT)csl.pl), Apr 19 2008
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