On the Integers Relatively Prime to n and a Number-Theoretic Function Considered by Jacobsthal.
Mathematica Scandinavica, Tome 10 (1962), pp. 163-170.

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     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},
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     url = {http://geodesic.mathdoc.fr/item/MS2_1962__10_165799/}
}
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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/