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A253773
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Numbers k such that 4^k + 15 is prime.
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2
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1, 2, 3, 4, 5, 6, 8, 11, 13, 15, 16, 20, 21, 23, 36, 38, 90, 99, 155, 164, 171, 254, 255, 273, 404, 1386, 1941, 1970, 2420, 3759, 5559, 5776, 6369, 6429, 22061, 32330, 81780, 90248, 162933, 240920, 504584
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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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EXAMPLE
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For k = 15, 4^15 + 15 = 1073741839 is prime.
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MATHEMATICA
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Select[Range[10000], PrimeQ[4^# + 15] &]
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PROG
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(Magma) [n: n in [0..1300] | IsPrime(4^n+15)];
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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