Definition:Odd Integer/Odd-Times Odd/Definition 2
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Definition
Let $n \in \Z$ be an integer.
$n$ is odd-times odd if and only if there exist odd numbers $x, y > 1$ such that $n = x y$.
Euclid's Definition
In the words of Euclid:
- An odd-times odd number is that which is measured by an odd number according to an odd number.
(The Elements: Book $\text{VII}$: Definition $10$)