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Publicado en línea: 09 feb 2016
Páginas: 265 - 277
Recibido: 09 feb 2015
DOI: https://doi.org/10.1515/ausm-2015-0018
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© 2016
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Upper bounds for σ(n) are provided in terms of other arithmetic functions as ϕ(n), d(n), ψ(n), P(n), etc. Comparision of older results are given, too.