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Wikipedia definition
1. Amicable numbersAmicable numbers are two different numbers so related that the sum of the proper divisors of each is equal to the other number. (A proper divisor of a number is a positive integer divisor other than the number itself. For example, the proper divisors of 6 are 1, 2, and 3. ) A pair of amicable numbers constitutes an aliquot sequence of period 2.
Read “Amicable numbers” on English Wikipedia
Read “友愛数” on Japanese Wikipedia
Read “Amicable numbers” on DBpedia

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