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6 relations: Harmonic divisor number, List of numbers, List of perfect numbers, Perfect number, 127 (number), 8000 (number).
Harmonic divisor number
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.
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List of numbers
This is a list of articles about numbers (not about numerals).
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List of perfect numbers
The following is a list of the known perfect numbers, and the exponents p that can be used to generate them (using the expression 2p−1× (2p − 1)) whenever 2p − 1 is a Mersenne prime.
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Perfect number
In number theory, a perfect number is a positive integer that is equal to the sum of its proper positive divisors, that is, the sum of its positive divisors excluding the number itself (also known as its aliquot sum).
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127 (number)
127 (one hundred twenty-seven) is the natural number following 126 and preceding 128.
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8000 (number)
8000 (eight thousand) is the natural number following 7999 and preceding 8001.
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