# 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**.

## Sources

- 1986: David Wells:
*Curious and Interesting Numbers*... (previous) ... (next): $3$ - 1992: George F. Simmons:
*Calculus Gems*... (previous) ... (next): Chapter $\text {A}.2$: Pythagoras (ca. $580$ – $500$ B.C.) - 1997: David Wells:
*Curious and Interesting Numbers*(2nd ed.) ... (previous) ... (next): $3$