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A039687
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Primes of the form 3*2^k + 1.
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20
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7, 13, 97, 193, 769, 12289, 786433, 3221225473, 206158430209, 6597069766657, 221360928884514619393, 2353913150770005286438421033702874906038383291674012942337
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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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FORMULA
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MATHEMATICA
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Select[Table[6 2^n+1, {n, 0, 250}], PrimeQ] (* Harvey P. Dale, Dec 17 2010 *)
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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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STATUS
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approved
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