Arithmetic functions

What the problems look like

A few statements from this skill. Answers, hints and worked solutions live in the practice session.

1. Warm-up

   Let $n=22$, the product of the distinct primes $2$ and $11$. Compute $\sigma(n)$, the sum of all positive divisors of $n$.

2. Warm-up

   Let $n=14$, the product of the distinct primes $2$ and $7$. Compute $\sigma(n)$, the sum of all positive divisors of $n$.

3. Warm-up

   Let $n=10$, the product of the distinct primes $2$ and $5$. Compute $\sigma(n)$, the sum of all positive divisors of $n$.

Problems shown under their original terms: Generated (template, solver-computed).