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A124487
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Numbers k such that 2*k-1, 4*k-1, 6*k-1 and 8*k-1 are primes.
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2
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3, 45, 705, 945, 5295, 5775, 5955, 6450, 8580, 9945, 11175, 12120, 13095, 18000, 18525, 18690, 19710, 22440, 22785, 24960, 30390, 33780, 34335, 37665, 41790, 44460, 52185, 54180, 56175, 57300, 63570, 66990, 67515, 67725, 73335, 74700
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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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Select[Range[80000], And @@ PrimeQ /@ ({2, 4, 6, 8}*# - 1) &] (* Ray Chandler, Nov 21 2006 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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