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A217349
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Numbers k such that 4^k + 7 is prime.
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3
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1, 2, 3, 4, 5, 8, 9, 10, 14, 15, 19, 22, 39, 44, 49, 63, 80, 87, 102, 107, 294, 305, 399, 463, 595, 599, 903, 944, 1324, 1727, 1755, 1932, 1935, 4485, 6165, 6665, 9438, 11169, 19859, 27503, 55392, 86235, 98217, 117855, 123640, 134204, 139660, 150437, 157634, 186475, 236129, 283248, 390142, 410178
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OFFSET
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1,2
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COMMENTS
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LINKS
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FORMULA
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EXAMPLE
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For k = 14, 4^14 + 7 = 268435463 is prime.
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MATHEMATICA
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Select[Range[0, 5000], PrimeQ[4^# + 7] &]
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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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EXTENSIONS
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STATUS
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approved
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