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A273945
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Odd prime factors of generalized Fermat numbers of the form 3^(2^m) + 1 with m >= 0.
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8
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5, 17, 41, 193, 257, 12289, 59393, 65537, 275201, 786433, 790529, 8972801, 13631489, 21523361, 134382593, 155189249, 448524289, 524455937, 847036417, 3221225473, 12348030977, 22320686081, 77309411329, 206158430209, 4638564679681, 6597069766657, 12079910333441
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OFFSET
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1,1
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COMMENTS
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Odd primes p such that the multiplicative order of 3 (mod p) is a power of 2.
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LINKS
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MATHEMATICA
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Select[Prime@Range[2, 10^5], IntegerQ@Log[2, MultiplicativeOrder[3, #]] &]
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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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