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A307843
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Divisors of Fermat numbers.
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2
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1, 3, 5, 17, 257, 641, 65537, 114689, 274177, 319489, 974849, 2424833, 6700417, 13631489, 26017793, 45592577, 63766529, 167772161, 825753601, 1214251009, 4294967297, 6487031809, 70525124609, 190274191361, 311453532161, 646730219521, 2710954639361
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OFFSET
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1,2
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COMMENTS
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Has both A000215 and A023394 as subsequences. Outside these are 1 and the composite proper divisors of Fermat numbers, namely 311453532161, 2983954661377, 7313319444481, ...
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LINKS
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EXAMPLE
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311453532161 is included because it divides 2^(2^11) + 1. It is not included in A023394 because it is composite.
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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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