practical number
plural of court of record
(zoology) Any bird which has the toes bordered by membranes.
A surname from German.
(mathematics) Any positive integer having the property that all smaller integers can be represented as sums of distinct divisors of it
セミナーで彼女は、12が実用数であることを示し、より小さいすべての整数がその互いに異なる約数の和として表せることを説明した。
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