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Search: id:A067387
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| A067387 |
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Prime factors of terms of A001317 in order of their first appearance. |
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+0
2
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| 3, 5, 17, 257, 65537, 641, 6700417, 274177, 67280421310721, 59649589127497217, 5704689200685129054721, 1238926361552897, 93461639715357977769163558199606896584051237541638188580280321
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OFFSET
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1,1
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COMMENT
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It is conjectured that among prime factors of A001317 only prime factors of Fermat numbers appear. A001317(-1+2^n) is product of all odd prime-factors emerged as prime-factors of previous terms while at A001317(2^n) new factors arise.
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LINKS
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Link to a section of The World of Mathematics.
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EXAMPLE
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A001317(127) = 3.5.17.257.65537.641.6700417.274177.6728042130721, A001317(128) = 59649589127497217.5704689200685129054721. See also A050922. Compare with A053576, where 2 and A000215 appear as prime factors.
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CROSSREFS
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Presumably the conjecture is that this is a duplicate of A050922. - njas, Dec 21 2005
Cf. A001317, A000215, A001316, A003401, A045544, A053576, A050922.
Adjacent sequences: A067384 A067385 A067386 this_sequence A067388 A067389 A067390
Sequence in context: A125045 A130728 A050922 this_sequence A070592 A000215 A123599
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Jan 21 2002
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EXTENSIONS
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Corrected by njas, Dec 21 2005
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