Harmonic divisor number
- 欧尔调和数（定义欧尔调和数为正整数n，其所有因数的调和平均为整数。欧尔调和数最早出现在奥斯丁·欧尔1948年的论文中）
Harmonic divisor number
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abstract:
In mathematics, a harmonic divisor number, or Ore number (named after Øystein Ore who defined it in 1948), is a positive integer whose divisors have a harmonic mean that is an integer. The first few harmonic divisor numbers are
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