English Dictionary

amicable number

名詞

(number theory) One of a pair of numbers having the property that the sum of the divisors of each, excluding itself, is equal to the other number.

日本語の意味

互いに真の約数（自分自身を除く）の和が相手の数となる、2つの数の組。

The mathematician illustrated the concept of an amicable number by showing that 220 and 284 form a classic pair.

その数学者は、220と284が典型的な対を成すことを示して、友愛数の概念を説明した。

意味（1）

(number theory) One of a pair of numbers having the property that the sum of the divisors of each, excluding itself, is equal to the other number.

The factors of 220, excluding 220 itself, are 1, 2, 4, 5, 10, 11, 20, 22, 44, 55 and 110 and sum to 284; the factors of 284, excluding 284 itself, are 1, 2, 4, 71, and 142, and sum to 220; hence 220 and 284 are amicable numbers.

amicable numbers （ plural ）