@article{GDZPPN002081687, title = {Note on the diophantine equation 1 + x + x2 + ... + xn = ym.}, journal = {Elemente der Mathematik}, volume = {42}, year = {1987}, pages = {76-76}, zbl = {0703.11016}, url = {http://dml.mathdoc.fr/item/GDZPPN002081687} }
Rotkiewicz, A. Note on the diophantine equation 1 + x + x2 + ... + xn = ym.. Elemente der Mathematik, Tome 42 (1987) p. 76. http://gdmltest.u-ga.fr/item/GDZPPN002081687/