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Search: id:A081979
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| A081979 |
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Smallest Fibonacci number with 2n divisors, or 0 if no such number exists. |
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+0
3
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OFFSET
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1,1
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COMMENT
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Further known entries are a(12)=A000045(91); a(16)=A000045(44); a(24)=A000045(50); a(32)=A000045(30); a(36)=A000045(24); a(48)=A000045(56); a(64)=A000045(54); a(80)=A000045(36); a(96)=A000045(182); a(128)=A000045(128) ; a(168)=A000045(48); a(192)=A000045(110); a(256)=A000045(80),..., a(688128)=A000045(240) from the Kelly factorizations. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 05 2007
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LINKS
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B. Kelly, Fibonacci Factorizations.
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EXAMPLE
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a(2)=8 because 8 is the smallest Fibonacci number with 4 divisors (1,2,4,8).
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CROSSREFS
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Cf. A081978.
Adjacent sequences: A081976 A081977 A081978 this_sequence A081980 A081981 A081982
Sequence in context: A058437 A046967 A007753 this_sequence A012672 A024340 A012667
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KEYWORD
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more,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 03 2003
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EXTENSIONS
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Corrected by Emeric Deutsch (deutsch(AT)duke.poly.edu), Apr 19 2005
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