Distribution of Primes #7: The Divisor-Sum Function, sigma(n)
Автор: CrystalMath
Загружено: 2019-01-26
Просмотров: 7901
In this video, we introduce the divisor-sum function, sigma(n), which sums the divisors of n. In the next video we'll use (and eventually prove) a formula that expresses sigma(n) in terms of the prime factors of n.
This function is also sometimes denoted sigma_1(n), with the divisor counting function sigma_0(n).
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