Find all positive integers $n$ that have distinct positive divisors $d_1, d_2, \dots, d_k$, where $k>1$, that are in arithmetic progression and $$n=d_1+d_2+\cdots+d_k.$$ Note that $d_1, d_2, \dots, d_k$ do not have to be all the divisors of $n$.
1. Let \( d_1 = m \) and \( d_2 - d_1 = a \). Then the divisors in arithmetic progression are \( d_1, d_2, \ldots, d_k \) where \( d_i = m + (i-1)a \) for \( i = 1, 2, \ldots, k \).

2. The sum of these divisors is:
   \[
   n = d_1 + d_2 + \cdots + d_k = m + (m + a) + (m + 2a) + \cdots + (m + (k-1)a)
   \]
   This can be simplified using the formula for the sum of an arithmetic series:
   \[
   n = k \cdot m + a \cdot \frac{k(k-1)}{2}
   \]

3. Since \( d_k \mid n \), we have:
   \[
   m + (k-1)a \mid k \cdot m + a \cdot \frac{k(k-1)}{2}
   \]

4. Let \( \gcd(m, a) = d \). Then \( m = dm_1 \) and \( a = da_1 \) with \( \gcd(m_1, a_1) = 1 \). Substituting these into the divisibility condition, we get:
   \[
   m_1 + (k-1)a_1 \mid m_1k + a_1 \cdot \frac{k(k-1)}{2}
   \]

5. Similarly, since \( d_{k-1} \mid n \), we have:
   \[
   m_1 + (k-2)a_1 \mid m_1k + a_1 \cdot \frac{k(k-1)}{2}
   \]

6. Using the Euclidean algorithm, we find:
   \[
   \gcd(m_1 + (k-1)a_1, m_1 + (k-2)a_1) = \gcd(a_1, m_1 + (k-2)a_1) = \gcd(m_1, a_1) = 1
   \]

7. Therefore, from the above, we obtain:
   \[
   (m_1 + (k-1)a_1) \cdot (m_1 + (k-2)a_1) \mid m_1k + a_1 \cdot \frac{k(k-1)}{2}
   \]

8. Expanding and simplifying, we get:
   \[
   m_1^2 + m_1a_1(2k-3) + a_1^2(k-1)(k-2) \mid m_1k + a_1 \cdot \frac{k(k-1)}{2}
   \]

9. From this, we deduce that \( 2 \le k \le 3 \).

**Case 1:** If \( k = 2 \):
   \[
   m_1^2 + m_1a_1 \mid 2m_1 + a_1
   \]
   Since \( \gcd(m_1, a_1) = 1 \) and \( m_1 \mid 2m_1 + a_1 \), we get \( m_1 = 1 \). This implies:
   \[
   a_1 + 1 \mid 2 + a_1
   \]
   which is a contradiction.

**Case 2:** If \( k = 3 \):
   \[
   m_1^2 + 3m_1a_1 + 2a_1^2 \mid 3m_1 + 3a_1
   \]
   From here, we get \( a_1 = 1 \). Therefore:
   \[
   m_1^2 + 2m_1 + 2 \mid 3m_1 + 3
   \]
   This implies \( m_1 = 1 \). Hence, \( m = a \) and \( k = 3 \).

10. Therefore, the divisors are \( d_1 = m, d_2 = 2m, d_3 = 3m \) and:
    \[
    n = d_1 + d_2 + d_3 = 6m
    \]

Thus, the solution is \( n = 6m \) for all \( m \in \mathbb{Z}^+ \).

The final answer is \( \boxed{ n = 6m } \) for all \( m \in \mathbb{Z}^+ \).