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bn:03098917n
Noun Concept
Categories: Integer sequences, Divisor function, Unsolved problems in number theory
EN
friendly number  friendly numbers  friendly pair  Kinship  Solitary number
EN
In number theory, friendly numbers are two or more natural numbers with a common abundancy index, the ratio between the sum of divisors of a number and the number itself. Wikipedia
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Sources
EN
In number theory, friendly numbers are two or more natural numbers with a common abundancy index, the ratio between the sum of divisors of a number and the number itself. Wikipedia
In mathematics, shares a property concerning its divisors Wikidata
OPPOSITE OF
solitary number
Wikipedia
EN
friendly number
Wikidata
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friendly number
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EN
friendly numbers, friendly pair, Kinship (number theory), Solitary number

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