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A046052
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Number of prime factors of Fermat number F(n).
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2
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1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 4, 5
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history;
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OFFSET
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0,6
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COMMENTS
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F(12) has 6 known factors with C1133 remaining. [Updated by Walter Nissen, Apr 02 2010]
F(13) has 4 known factors with C2391 remaining.
F(14) has one known factor with C4880 remaining. [Updated by Matt C. Anderson, Feb 14 2010]
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LINKS
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Table of n, a(n) for n=0..11.
W. Keller, Prime factors k.2^n + 1 of Fermat numbers F_m
W. Keller, Summary of factoring status for Fermat numbersF(n)
PSI (The algorithm company), Fermat factor status [Broken link?]
Eric Weisstein's World of Mathematics, Fermat Number
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CROSSREFS
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Cf. A000215.
Sequence in context: A029081 A168656 A005862 * A202276 A029115 A029101
Adjacent sequences: A046049 A046050 A046051 * A046053 A046054 A046055
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KEYWORD
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nonn,hard
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AUTHOR
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Eric W. Weisstein
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EXTENSIONS
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Name corrected by Arkadiusz Wesolowski, Oct 31 2011
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STATUS
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approved
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