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A057912
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Numbers k such that 3*2^k - 5 is prime.
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1
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2, 3, 4, 7, 9, 10, 13, 15, 25, 31, 34, 48, 52, 64, 109, 145, 162, 204, 207, 231, 271, 348, 444, 553, 559, 1504, 1708, 3048, 3970, 4423, 4668, 5737, 5877, 6130, 8584, 10663, 12517, 16591, 18450, 19362, 22291, 34468, 36637, 52212, 59040, 130279, 236511, 392260, 496411, 536868, 565024, 662703, 908005
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OFFSET
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1,1
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COMMENTS
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LINKS
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MATHEMATICA
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Do[ If[ PrimeQ[ 3*2^n - 5 ], Print[ n ] ], {n, 1, 3000} ]
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PROG
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CROSSREFS
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Cf. A048488 (3*2^k - 5, but with different offset).
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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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