In number theory, an Erdős–Nicolas number is a number that is not perfect, but that equals one of the partial sums of its divisors. That is, a number n is an Erdős–Nicolas number when there exists another number m such that ∑ d ∣ n , d ≤ m d = n .
In number theory, an Erdős–Nicolas number is a number that is not perfect, but that equals one of the partial sums of its divisors. That is, a number n is an Erdős–Nicolas number when there exists another number m such that ∑ d ∣ n , d ≤ m d = n .
Source: Wikipedia "Erdős–Nicolas number" · CC BY-SA 4.0
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