Definition:Odd Integer/Historical Note

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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 Plato 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.