A perfect number is a positive integer that is equal to the sum of its proper positive divisors.
A perfect number is a positive integer that is equal to the sum of its proper positive divisors.
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Kindda-Perfect number: Is there a sequence of numbers which are equal to the sum of its proper divisors excluding itself as well as 1?Perfect numbers and perfect powers
Density of perfect numbers
Is there a similar formula like Ramanunjan's Eisenstein series identity for $\sum_{k=1}^{n-1}k^2 \sigma(k)\sigma(n-k)$?
Is there a similar formula like Ramanunjan's Eisenstein series identity for $\sum_{k=1}^{n-1}k^2 \sigma(k)\sigma(n-k)$?
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