Definition:Unitary Divisor

Definition

Let $n \in \Z$ be an integer.

Let $d \in \Z$ be such that:

$d$ is a divisor of $n$

$d$ and $\dfrac n d$ are coprime.

Then $d$ is a unitary divisor of $n$.

Sources

• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $87,360$