Divisor Sum of 323
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Example of Divisor Sum of Non-Square Semiprime
- $\map {\sigma_1} {323} = 360$
where $\sigma_1$ denotes the divisor sum function.
Proof
We have that:
- $323 = 17 \times 19$
and so by definition is a semiprime whose prime factors are distinct.
Hence:
\(\ds \map {\sigma_1} {323}\) | \(=\) | \(\ds \paren {17 + 1} \paren {19 + 1}\) | Divisor Sum of Non-Square Semiprime | |||||||||||
\(\ds \) | \(=\) | \(\ds 18 \times 20\) | ||||||||||||
\(\ds \) | \(=\) | \(\ds \paren {2 \times 3^2} \times \paren {2^2 \times 5}\) | ||||||||||||
\(\ds \) | \(=\) | \(\ds 2^3 \times 3^2 \times 5\) | ||||||||||||
\(\ds \) | \(=\) | \(\ds 360\) |
$\blacksquare$