Integers $a_1, a_2, \dots a_n$ are different at $\text{mod n}$. If $a_1, a_2-a_1, a_3-a_2, \dots a_n-a_{n-1}$ are also different at $\text{mod n}$, we call the ordered $n$-tuple $(a_1, a_2, \dots a_n)$ [i]lucky[/i]. For which positive integers $n$, one can find a lucky $n$-tuple?
1. **Case \( n = 1 \):**
   - For \( n = 1 \), we can take \( a_1 = 0 \). 
   - Since there is only one element, the condition is trivially satisfied.

2. **Case \( n \) is even:**
   - Let \( n = 2k \) for some integer \( k \).
   - Define the sequence as follows:
     \[
     a_{2i} = n - i \quad \text{and} \quad a_{2i-1} = i - 1 \quad \text{for} \quad i = 1, 2, \ldots, k
     \]
   - This construction ensures that \( a_1, a_2, \ldots, a_n \) are distinct modulo \( n \).
   - We need to check that \( a_1, a_2 - a_1, a_3 - a_2, \ldots, a_n - a_{n-1} \) are also distinct modulo \( n \).

3. **Verification for even \( n \):**
   - Consider the sequence \( a_1, a_2, \ldots, a_n \):
     \[
     a_1 = 0, \quad a_2 = n - 1, \quad a_3 = 1, \quad a_4 = n - 2, \quad \ldots, \quad a_{2k-1} = k - 1, \quad a_{2k} = k
     \]
   - The differences are:
     \[
     a_2 - a_1 = n - 1, \quad a_3 - a_2 = 1 - (n - 1) = 2 - n, \quad a_4 - a_3 = (n - 2) - 1 = n - 3, \quad \ldots
     \]
   - These differences are distinct modulo \( n \) because they cover all residues \( 1, 2, \ldots, n-1 \).

4. **Case \( n \) is odd and greater than 1:**
   - Suppose \( n \) is odd and greater than 1.
   - We need to show that it is impossible to find a lucky \( n \)-tuple.
   - Since \( a_1, a_2 - a_1, a_3 - a_2, \ldots, a_n - a_{n-1} \) are distinct modulo \( n \), they must cover all residues \( 0, 1, \ldots, n-1 \).
   - Since \( a_i \not\equiv a_j \pmod{n} \) for \( i \neq j \), \( a_2 - a_1, a_3 - a_2, \ldots, a_n - a_{n-1} \not\equiv 0 \pmod{n} \).
   - Therefore, \( a_1 \equiv 0 \pmod{n} \).
   - Summing the differences:
     \[
     a_1 + (a_2 - a_1) + (a_3 - a_2) + \ldots + (a_n - a_{n-1}) \equiv 0 + 1 + 2 + \ldots + (n-1) \equiv \frac{(n-1)n}{2} \equiv 0 \pmod{n}
     \]
   - Hence, \( a_n \equiv 0 \pmod{n} \).
   - We have \( a_1 \equiv a_n \equiv 0 \pmod{n} \), which contradicts the distinctness of \( a_i \) modulo \( n \).

Conclusion:
- For \( n = 1 \) or \( n \) is even, a lucky \( n \)-tuple exists.
- For odd \( n > 1 \), a lucky \( n \)-tuple does not exist.

The final answer is \( \boxed{ n = 1 } \) or \( n \) is even.