Three theorems of Nagell of 1923 concerning integer values of certain sums of fractions are extended.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-ba61-3-1, author = {A. Schinzel}, title = {Extensions of Three Theorems of Nagell}, journal = {Bulletin of the Polish Academy of Sciences. Mathematics}, volume = {61}, year = {2013}, pages = {195-200}, zbl = {06273828}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-ba61-3-1} }
A. Schinzel. Extensions of Three Theorems of Nagell. Bulletin of the Polish Academy of Sciences. Mathematics, Tome 61 (2013) pp. 195-200. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-ba61-3-1/