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@article{EUG_1996__46_a5, author = {Florian Luca}, title = {On the {Sum-of-Divisors} {Function} of the {Numbers} of {Fermat} and {Ferentinou-Nicolacopoulou}}, journal = {E\ensuremath{\upsilon}\ensuremath{\kappa}\ensuremath{\lambda}\ensuremath{\varepsilon}\ensuremath{\acute\iota}\ensuremath{\delta}\ensuremath{\eta}\ensuremath{\varsigma} \ensuremath{\Gamma} }, pages = {11-21}, publisher = {mathdoc}, volume = {46}, year = {1996}, language = {gr}, url = {http://geodesic.mathdoc.fr/item/EUG_1996__46_a5/} }
Florian Luca. On the Sum-of-Divisors Function of the Numbers of Fermat and Ferentinou-Nicolacopoulou. Ευκλείδης Γ , Tome 46 (1996), p. 11-21. http://geodesic.mathdoc.fr/item/EUG_1996__46_a5/