[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)
Hagen
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