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友愛数
noun
(number theory) amicable numbers, two different numbers related in such a way that the sum of the proper divisors of each is equal to the other number.
完全数
noun
(number theory) perfect number, a positive integer that is equal to the sum of its positive divisors, excluding the number itself
不足数
noun
(number theory) deficient number, a number for which the sum of proper divisors is less than that number
過剰数
noun
(number theory) abundant number, a number that is smaller than the sum of its proper divisors
アボガドロ数
noun
(chemistry, physics) Avogadro's number (number of atoms present in 0.012 kilograms of isotopically pure Carbon-12)
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