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In number theory, a weird number is a natural number that is abundant but not semiperfect. In other words, the sum of the proper divisors (divisors including 1 but not itself) of the number is greater than the number, but no subset of those divisors sums to the number itself.
Standards, Properties & Examples
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weird numbers number primitive divisors sum greater many prime proper also abundant subset infinitely exist sums 70 semiperfect example 16
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Weird number | is a | natural number that is abundant but not semiperfect | 0.90 | text |
| Weird number | related to Examples | The | 0.60 | section |
| Weird number | related to Examples | Its | 0.60 | section |
| Weird number | related to External links | Mathematics | 0.60 | section |
| Weird number | related to External links | Weisstein | 0.60 | section |
| Weird number | related to External links | Eric | 0.60 | section |
| Weird number | related to External links | Weird | 0.60 | section |
| Weird number | related to External links | MathWorld | 0.60 | section |
| Weird number | related to Primitive weird numbers | This | 0.60 | section |
| Weird number | related to Primitive weird numbers | A002975 | 0.60 | section |
| Weird number | related to Primitive weird numbers | OEIS | 0.60 | section |
| Weird number | related to Primitive weird numbers | Among | 0.60 | section |
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