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A217351
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Numbers k such that 6^k + 7 is prime.
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3
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1, 2, 3, 4, 6, 21, 24, 27, 30, 54, 70, 126, 369, 435, 612, 787, 1275, 2155, 2436, 5734, 6016, 16107, 25786
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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Select[Range[10000], PrimeQ[6^# + 7] &]
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PROG
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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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EXTENSIONS
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STATUS
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approved
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