sociable number

== English == === Noun === sociable number (plural sociable numbers) (number theory) Any of a sequence of numbers having the property that the sum of the divisors of each, excluding itself, is equal to the next number in the sequence; in the case of the last number of the sequence, the sum of the divisors, excluding that number, is equal to the first number of the sequence. ==== Translations ==== === See also === abundant number amicable numbers deficient number perfect number