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A056802
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Numbers n such that 2*9^n + 1 is prime.
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1
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0, 1, 2, 3, 8, 15, 27, 30, 66, 90, 160, 348, 391, 411, 626, 727, 2740, 3921, 6048, 6891, 8860, 21978, 32411, 41390, 52553, 82948, 95907, 264840, 537363, 543056, 587616, 638931, 673271, 1561518
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OFFSET
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1,3
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LINKS
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MATHEMATICA
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Do[ If[ PrimeQ[ 2*9^n + 1], Print[ n ]], {n, 0, 1000}]
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PROG
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CROSSREFS
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Cf. A003306 (n such that 2*3^n + 1 is prime).
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KEYWORD
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nonn,hard,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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