TY  - JOUR
AU  - P. Erdös
TI  - On the Integers Relatively Prime to n and a Number-Theoretic Function Considered by Jacobsthal.
JO  - Mathematica Scandinavica
PY  - 1962
SP  - 163
EP  - 170
VL  - 10
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MS2_1962__10_165799/
ID  - MS2_1962__10_165799
ER  -