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Definition of Sociable numbers
1. Noun. (number theory) 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. ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of Sociable Numbers
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