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On the sum Σ d |2 n −1d −1 |
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| Authors: | P Erdös |
| Institution: | (1) Technion-Israel Institute of Technology, Haifa |
| Abstract: | Letσ(n) be the sum of divisors ofn. In this paper we proveσ(2 n − 1)<c(2 n − 1) log logn. To the memory of my friend, colleague and collaborator, Eri Jabotinsky |
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