Definition:Odd Integer/Historical Note

Historical Note on Odd Integer
The concept of classifying numbers as odd or even appears to have originated with the Pythagoreans.

It was their belief that odd numbers (except $1$) are male, and even numbers are female.

A commentator on used the term scalene number for an odd number, in correspondence with the concept of a scalene triangle. In a similar way an even number was described as isosceles.