@article{10_4153_CMB_1958_002_9,
     author = {Erd\"os, Paul},
     title = {On an {Elementary} {Problem} in {Number} {Theory}},
     journal = {Canadian mathematical bulletin},
     pages = {5--8},
     year = {1958},
     volume = {1},
     number = {1},
     doi = {10.4153/CMB-1958-002-9},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1958-002-9/}
}