sociable number

短语

词形变化

sociable numbers 复数 sociable numbers

释义与例句

n.
  1. 1.

    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.

    数学