@article{JIS_2007__10_1_a5,
     author = {Grundman, H.G. and Teeple, E.A.},
     title = {Sequences of generalized happy numbers with small bases},
     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_a5/}
}