Definition:Perfect Number/Also known as
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Perfect Number: Also known as
The even perfect numbers are also known as the Euclid numbers.
However, on $\mathsf{Pr} \infty \mathsf{fWiki}$ we already have a definition for Euclid number, as one more than a primorial.
As the only known perfect numbers are all even anyway, the distinction is rarely considered worthy of a separate definition.
Sources
- 1989: Ephraim J. Borowski and Jonathan M. Borwein: Dictionary of Mathematics ... (previous) ... (next): Euclid numbers