perfect number
simple past tense and past participle of middle-click
An area in the county of Caithness, Scotland. / (historical) An agricultural fair formerly held in this area on St. George's Day.
Having or relating to melanaemia.
(number theory) A number that is the sum of all of its divisors except itself.
すべての完全数は自分自身を除く約数の和に等しく、28はその最小の例の一つです。
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