Divisor Sum of 3

Example of Divisor Sum of Prime Number

 * $\map {\sigma_1} 3 = 4$

where ${\sigma_1}$ denotes the divisor sum.

Proof
From Divisor Sum of Prime Number:
 * $\map {\sigma_1} p = p + 1$

where $p$ is a prime number.

We have that $3$ is a prime number.

Hence:
 * $\map {\sigma_1} 3 = 3 + 1 = 4$

[[Category:3]]