@article{JIS_2007__10_1_a7,
     author = {De Koninck, Jean-Marie and Luca, Florian},
     title = {Partial sums of powers of prime factors},
     journal = {Journal of integer sequences},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2007__10_1_a7/}
}