Definition:Ore Number

Definition
Let $n \in \Z_{>0}$ be a positive integer.

$n$ is an Ore number the harmonic mean of its divisors is an integer.

Also known as
An Ore number can also be seen referred to as a harmonic number, but that term is used on to denote a summation of reciprocals.

Other sources use the more unwieldy term harmonic divisor number.

Still others use the term Ore harmonic number or Ore's harmonic number.