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bn:03771494n
Noun Concept
Categories: Integer sequences, Divisor function, Arithmetic dynamics
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
Definitions
Relations
Sources
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
IS A
natural number
HAS INSTANCE
65,536
836
276
1972
1962
+27 relations
Wikipedia
EN
untouchable number
Wikidata
EN
untouchable number
Wiktionary
EN
untouchable number

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