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Harmonic divisor number
? TBD
Positive integer whose divisors have a harmonic mean that is an integer
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Perfect number
Number equal to the sum of its proper divisors
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In mathematics, a harmonic divisor number or Ore number is a positive integer whose divisors have a harmonic mean that is an integer. The first few harmonic divisor numbers are

Instance of
type of integer
Mathematical concept
Subclass of
Positive integer
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