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A111974
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Primes of the form 2*3^k + 1.
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8
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3, 7, 19, 163, 487, 1459, 39367, 86093443, 258280327, 411782264189299, 116299474006080119380780339, 3140085798164163223281069127, 84782316550432407028588866403, 20602102921755074907947094535687
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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Select[2*3^Range[100]+1, PrimeQ]
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CROSSREFS
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Cf. A003306 (k such that 2*3^k + 1 is prime), A003307 (k such that 2*3^k - 1 is prime).
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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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