#harmonic_divisor_number
Harmonic divisor number
Positive integer whose divisors have a harmonic mean that is an integer
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 are1, 6, 28, 140, 270, 496, 672, 1638, 2970, 6200, 8128, 8190.
Fri 12th
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