In number theory, a weird number is a natural number that is abundant but not semiperfect. This means the sum of its proper divisors, the divisors less than the number itself, is greater than the number, yet no subset of those divisors adds up to the number exactly. Weird numbers sit between abundant numbers, whose divisors merely exceed the number, and semiperfect numbers, whose divisors can be combined to reach the number exactly.
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1. Weird Number (Wikipedia)
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In number theory, a weird number is a natural number that is abundant but not semiperfect.
In Branch: Number Theory, Lead sentence
In number theory, a weird number is a natural number that is abundant but not semiperfect.
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