MEMO 2008 ekipno problem 8


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28. travnja 2012.
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Prove: If the sum of all positive divisors of n \in \mathbb{Z}^{+} is a power of two, then the number/amount of the divisors is a power of two.
Izvor: Srednjoeuropska matematička olimpijada 2008, ekipno natjecanje, problem 8