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A273950
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Prime factors of generalized Fermat numbers of the form 12^(2^m) + 1 with m >= 0.
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11
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5, 13, 17, 29, 89, 97, 233, 257, 769, 36097, 40961, 65537, 81281, 153953, 163841, 260753, 1724417, 4550657, 5767169, 8253953, 11304961, 13631489, 21495809, 69619841, 77651969, 147849217, 158334977, 159522817, 1711276033, 6528575489, 27286044673, 52613349377
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OFFSET
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1,1
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COMMENTS
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Primes p such that the multiplicative order of 12 (mod p) is a power of 2.
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REFERENCES
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Hans Riesel, Common prime factors of the numbers A_n=a^(2^n)+1, BIT 9 (1969), pp. 264-269.
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LINKS
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MATHEMATICA
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Select[Prime@Range[2, 10^5], IntegerQ@Log[2, MultiplicativeOrder[12, #]] &]
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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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