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A090669
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Numbers n such that 7^n - 2 is a prime.
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25
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1, 2, 4, 7, 8, 12, 15, 28, 31, 84, 98, 128, 238, 302, 859, 1508, 1586, 2091, 2796, 2888, 3924, 4815, 5636, 6596, 7090, 20176, 22176, 56386, 84050, 115515, 245608, 259710, 274120
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OFFSET
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1,2
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LINKS
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EXAMPLE
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7^12 - 2 = 13841287199 a prime number.
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MATHEMATICA
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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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Herman H. Rosenfeld (herm3(AT)pacbell.net), Dec 16 2003
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EXTENSIONS
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STATUS
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approved
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