If we do not exclude unity and the number itself when summing up divisors, the 'abundant' numbers, whose divisors' sum is greater than themselves (for example, the number 18 referred to in the review) ...
https://doi.org/10.4169/amer.math.monthly.119.05.373 • https://www.jstor.org/stable/10.4169/amer.math.monthly.119.05.373 Copy URL Abstract We consider positive ...
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