Exponential unitary divisors

László Tóth, Nicuşor Minculete

We say that $d$ is an exponential unitary divisor of $n=p_1^{a_1}...p_r^{a_r}>1$ if $d=p_1^{b_1}...p_r^{b_r}$, where $b_i$ is a unitary divisor of $a_i$, i.e., $b_i\mid a_i$ and…