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Search: id:A137825
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| A137825 |
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Highest abundancy among numbers with exactly n factors (counting with multiplicity). |
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+0
2
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| 2, 6, 30, 60, 420, 4620, 13860, 180180, 360360, 6126120, 116396280
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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The Prime Glossary, Abundant Numbers.
Eric Weisstein's World of Mathematics, Abundancy.
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EXAMPLE
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a(4)=60 since it has four factors (2, 2, 3, 5) and its abundancy is 2.8; greater than any other number with four factors, i.e: 16 (1.93), 24 (2.5), 36 (2.52) and 210 (2.74).
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CROSSREFS
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Cf. A005101, A017665, A017666, A137286.
Sequence in context: A090801 A166062 A127517 this_sequence A008341 A117849 A088857
Adjacent sequences: A137822 A137823 A137824 this_sequence A137826 A137827 A137828
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KEYWORD
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easy,more,nonn
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AUTHOR
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Sergio Pimentel (ferdiego(AT)suddenlink.net), Feb 11 2008
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