[seqfan] Re: A151659

Hagen von EItzen math at von-eitzen.de
Mon Jun 22 18:12:25 CEST 2009

franktaw at netscape.net schrieb:
> First of all, the definition says UnitarySigma, not sigma.  See 
> http://mathworld.wolfram.com/UnitaryDivisor.html for more information.  
> It is not hard to show that OddPart(UnitarySigma(n)) < n for any odd n 
Sorry, my bad.
("Unitary sigma" had turned out to be a very bad Google search term and 
that had made me think that sigma^1 were meant)


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