bn:03771494n
Noun Concept
Categories: Arithmetic dynamics, Divisor function, Integer sequences
EN
untouchable number
EN
An untouchable number is a positive integer that cannot be expressed as the sum of all the proper divisors of any positive integer. Wikipedia
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EN
An untouchable number is a positive integer that cannot be expressed as the sum of all the proper divisors of any positive integer. Wikipedia
Positive integer unexpressable as the sum of all proper divisors of any other integer Wikidata
A positive integer that cannot be expressed as the sum of all the proper divisors of any positive integer (including the untouchable number itself). Wiktionary
Wikipedia
Wikidata
Wiktionary