Find all positive integers $n$ for which there are distinct integer numbers $a_1, a_2, ... , a_n$ such that
$$\frac{1}{a_1}+\frac{2}{a_2}+...+\frac{n}{a_n}=\frac{a_1 + a_2 + ... + a_n}{2}$$
To find all positive integers \( n \) for which there are distinct integer numbers \( a_1, a_2, \ldots, a_n \) such that 
\[
\frac{1}{a_1} + \frac{2}{a_2} + \cdots + \frac{n}{a_n} = \frac{a_1 + a_2 + \cdots + a_n}{2},
\]
we will analyze the problem step by step.

1. **Initial Inequality Analysis:**
   We start by considering the harmonic sum and the given equation:
   \[
   (n+1)H_n - n = \frac{1}{n} + \frac{2}{n-1} + \cdots + \frac{n}{1} \geq \frac{1}{a_1} + \frac{2}{a_2} + \cdots + \frac{n}{a_n} = \frac{a_1 + a_2 + \cdots + a_n}{2} \geq \frac{n(n+1)}{4}.
   \]
   This implies:
   \[
   (n+1)H_n - n \geq \frac{n(n+1)}{4}.
   \]
   Solving this inequality for \( n \), we find that \( n \leq 6 \).

2. **Case Analysis for \( n = 6 \):**
   For \( n = 6 \), we check if there exists a solution:
   \[
   \frac{1}{6} + \frac{2}{4} + \frac{3}{2} + \frac{4}{3} + \frac{5}{5} + \frac{6}{1} = \frac{21}{2} = \frac{6 + 4 + 2 + 3 + 5 + 1}{2}.
   \]
   This is a valid solution.

3. **Case Analysis for \( n = 5 \):**
   For \( n = 5 \), we check if there exists a solution:
   \[
   \frac{1}{3} + \frac{2}{4} + \frac{3}{2} + \frac{4}{6} + \frac{5}{1} = 8 = \frac{3 + 4 + 2 + 6 + 1}{2}.
   \]
   This is a valid solution.

4. **Case Analysis for \( n = 4 \):**
   For \( n = 4 \), we analyze the possible sets of \( \{a_1, a_2, a_3, a_4\} \):
   \[
   a_1 + a_2 + a_3 + a_4 \leq 10H_4 - 8 < 13.
   \]
   The possible sets are \( \{1, 2, 3, 4\}, \{1, 2, 3, 5\}, \{1, 2, 4, 5\}, \{1, 2, 3, 6\} \). We check each set:
   - If \( 5 \) is used, the denominator of the sum is divisible by \( 5 \), which is impossible.
   - If \( \{1, 2, 3, 6\} \), we must have \( \{a_1, a_4\} = \{3, 6\} \), but this leads to a contradiction:
     \[
     \frac{11}{2} \geq \frac{1}{6} + \frac{2}{2} + \frac{3}{1} + \frac{4}{3} = 6.
     \]
   - For \( \{1, 2, 3, 4\} \), we check all possible permutations and find no valid solutions.

5. **Case Analysis for \( n = 3 \):**
   For \( n = 3 \), we check if there exists a solution:
   \[
   \frac{1}{1} + \frac{2}{2} + \frac{3}{3} = \frac{1 + 2 + 3}{2}.
   \]
   This is a valid solution.

6. **Case Analysis for \( n = 2 \):**
   For \( n = 2 \), we solve the equation:
   \[
   2a_2 + 4a_1 = a_1a_2(a_1 + a_2).
   \]
   For \( a_1a_2 \leq 2 \), the LHS is bigger, and for \( a_1a_2 \geq 4 \), the LHS is smaller. Thus, \( a_1a_2 = 3 \) and \( a_1 = a_2 \), which is impossible.

7. **Case Analysis for \( n = 1 \):**
   For \( n = 1 \), we solve the equation:
   \[
   2 = a_1^2.
   \]
   There are no integer solutions.

The final answer is \( \boxed{ n = 3, 5, 6 } \).