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Search: id:A141643
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| A141643 |
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Numbers n such that sigma(n)/n = 5/2. |
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+0
6
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OFFSET
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1,1
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LINKS
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Walter Nissen, Abundancy : Some Resources
Walter Nissen, Home Page (listed in lieu of email address)
G. P. Michon, Multiperfect and hemiperfect numbers
Walter Nissen, Abundancy : Some Resources
Walter Nissen, Primitive Friendly Pairs with friends < 2^34 with denom < 20000
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CROSSREFS
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Cf. A055153, A141645, A159271, A160678.
Sequence in context: A013820 A075406 A075404 this_sequence A013910 A007458 A072244
Adjacent sequences: A141640 A141641 A141642 this_sequence A141644 A141645 A141646
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KEYWORD
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nonn,more,bref
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AUTHOR
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Yasutoshi Kohmoto (zbi74583(AT)boat.zero.ad.jp), May 10 2008
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EXTENSIONS
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Definition rewritten by M. F. Hasler, May 10 2008
First three terms confirmed by Ray Chandler (rayjchandler(AT)sbcglobal.net), Sep 18 2008.
There are no other terms though 2^34. - Walter Nissen Apr 17 2009
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