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@article{MS2_1962__10_165799, author = {P. Erd\"os}, title = {On the {Integers} {Relatively} {Prime} to n and a {Number-Theoretic} {Function} {Considered} by {Jacobsthal.}}, journal = {Mathematica Scandinavica}, pages = {163--170}, publisher = {mathdoc}, volume = {10}, year = {1962}, zbl = {0202.33002}, url = {http://geodesic.mathdoc.fr/item/MS2_1962__10_165799/} }
P. Erdös. On the Integers Relatively Prime to n and a Number-Theoretic Function Considered by Jacobsthal.. Mathematica Scandinavica, Tome 10 (1962), pp. 163-170. http://geodesic.mathdoc.fr/item/MS2_1962__10_165799/