sociable number

英語（米国） (en-US) 英語（イギリス） (en-GB)

名詞

(number theory) Any of a sequence of numbers having the property that the sum of the divisors of each, excluding itself, is equal to the next number in the sequence; in the case of the last number of the sequence, the sum of the divisors, excluding that number, is equal to the first number of the sequence.

日本語の意味

数論において、ある数列内の各数について、その数自身を除く約数の和が次の数と一致し、数列の最後の数においては、その和が最初の数と一致するという性質を持つ数のこと。

英語の意味

(number theory) Any of a sequence of numbers having the property that the sum of the divisors of each, excluding itself, is equal to the next number in the sequence; in the case of the last number of the sequence, the sum of the divisors, excluding that number, is equal to the first number of the sequence.

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The mathematician explained how a sociable number fits into a cycle of integers where each term's proper divisors sum to the next.

数学者は、各項の真の約数（その数自身を除く）の和が次の項に等しくなるような数列に属する数が、そのような循環にどのように組み込まれるかを説明した。

詳細

意味（1）

(number theory) Any of a sequence of numbers having the property that the sum of the divisors of each, excluding itself, is equal to the next number in the sequence; in the case of the last number of the sequence, the sum of the divisors, excluding that number, is equal to the first number of the sequence.

The numbers in the sequence <1264460, 1547860, 1727636, 1305184> are sociable numbers.

詳細

sociable numbers （ plural ）