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- noun Plural form of
amicable number .
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sionnach commented on the word amicable numbers
Any pair of integers a,b such that the factors of b add up to a and the factors of a add up to b.
220,284 represents such a pair, since the proper divisors of 220 are 1, 2, 4, 5, 10, 11, 20, 22, 44, 55 and 110, of which the sum is 284; and the proper divisors of 284 are 1, 2, 4, 71, and 142, of which the sum is 220.
Mathematical Aphrodisiac
November 17, 2007