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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.
十六夜
noun
Short for 十六夜の月 (izayoi no tsuki): the moon just past the full moon, the start of the waning moon
十六夜
noun
the sixteenth night of the month under the lunar calendar, just after the full moon
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