 The positive integers are grouped as follows: $1, 2+3, 4+5+6, 7+8+9+10,\dots$. Find the value of the $n$-th sum.
1. The positive integers are grouped as follows: \(1\), \(2+3\), \(4+5+6\), \(7+8+9+10\), \(\dots\). We need to find the value of the \(n\)-th sum.
2. Let \(S(k)\) denote the sum of the first \(k\) positive integers. By the formula for the sum of the first \(k\) positive integers, we have:
   \[
   S(k) = \frac{k(k+1)}{2}
   \]
3. The \(n\)-th group contains \(n\) terms. The number of terms in the first \(n-1\) groups is:
   \[
   1 + 2 + 3 + \cdots + (n-1) = \frac{(n-1)n}{2}
   \]
4. Therefore, the \(n\)-th group starts at:
   \[
   \frac{(n-1)n}{2} + 1
   \]
   and ends at:
   \[
   \frac{(n-1)n}{2} + n
   \]
5. The sum of the integers in the \(n\)-th group is:
   \[
   S\left(\frac{n(n+1)}{2}\right) - S\left(\frac{n(n-1)}{2}\right)
   \]
6. Using the formula for \(S(k)\), we have:
   \[
   S\left(\frac{n(n+1)}{2}\right) = \frac{\left(\frac{n(n+1)}{2}\right)\left(\frac{n(n+1)}{2} + 1\right)}{2}
   \]
   and
   \[
   S\left(\frac{n(n-1)}{2}\right) = \frac{\left(\frac{n(n-1)}{2}\right)\left(\frac{n(n-1)}{2} + 1\right)}{2}
   \]
7. Substituting these into the expression for the \(n\)-th sum, we get:
   \[
   a_n = \frac{\left(\frac{n(n+1)}{2}\right)\left(\frac{n(n+1)}{2} + 1\right)}{2} - \frac{\left(\frac{n(n-1)}{2}\right)\left(\frac{n(n-1)}{2} + 1\right)}{2}
   \]
8. Simplifying the expressions inside the sums, we have:
   \[
   a_n = \frac{\frac{n(n+1)}{2} \left(\frac{n(n+1)}{2} + 1\right)}{2} - \frac{\frac{n(n-1)}{2} \left(\frac{n(n-1)}{2} + 1\right)}{2}
   \]
9. Expanding and simplifying further:
   \[
   a_n = \frac{n^4}{8} + \frac{n^3}{4} + \frac{3n^2}{8} + \frac{n}{4} - \left(\frac{n^4}{8} - \frac{n^3}{4} + \frac{3n^2}{8} - \frac{n}{4}\right)
   \]
10. Combining like terms, we get:
    \[
    a_n = \frac{n^3}{2} + \frac{n}{2}
    \]

The final answer is \(\boxed{a_n = \frac{n^3}{2} + \frac{n}{2}}\).