@article{JIS_2014__17_1_a7,
     author = {Ikeda, Soichi and Matsuoka, Kaneaki},
     title = {On the lcm-sum function},
     journal = {Journal of integer sequences},
     publisher = {mathdoc},
     volume = {17},
     number = {1},
     year = {2014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2014__17_1_a7/}
}