amicable number
plural of hyperlattice
(slang, neologism) An aggressively strong handshake.
(number theory) One of a pair of numbers having the property that the sum of the divisors of each, excluding itself, is equal to the other number.
Abbreviation of regards.
その数学者は、220と284が典型的な対を成すことを示して、友愛数の概念を説明した。
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