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A126421
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Numbers n for which n^3-n-1 is prime.
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20
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2, 3, 4, 8, 9, 11, 14, 15, 16, 18, 21, 23, 24, 29, 31, 35, 36, 38, 41, 45, 48, 55, 58, 59, 60, 64, 69, 70, 71, 76, 81, 86, 98, 104, 108, 111, 113, 115, 119, 123, 126, 128, 130, 136, 140, 150, 151, 155, 163, 168, 174, 176, 183, 184, 185, 186, 188, 189, 191, 203, 206
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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a = {}; Do[If[PrimeQ[x^3 - x - 1], AppendTo[a, x]], {x, 1, 1000}]; a
Select[Range[300], PrimeQ[#^3-#-1]&] (* Harvey P. Dale, Jul 22 2013 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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