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A323042
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Numbers k such that 395*2^k+1 is prime.
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0
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5, 11, 23, 41, 221, 485, 839, 3029, 6479, 15455, 16715, 38399, 38525, 38645, 167501, 185571, 505679, 649445, 764369, 797849, 1106091, 1309751, 1447971, 1480715, 1538975
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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[1000], PrimeQ[395*2^# + 1] &] (* Robert Price, Jan 03 2019 *)
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CROSSREFS
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KEYWORD
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nonn,more,hard
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AUTHOR
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STATUS
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approved
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