Find all positive integers $n, n>1$ for wich holds : 
If $a_1, a_2 ,\dots ,a_k$ are all numbers less than $n$ and relatively prime to $n$ , and holds $a_1<a_2<\dots <a_k $, then none of sums $a_i+a_{i+1}$ for $i=1,2,3,\dots k-1 $ are divisible by $3$.
1. **Initial Considerations**: We need to find all positive integers \( n \) such that for all numbers \( a_1, a_2, \dots, a_k \) less than \( n \) and relatively prime to \( n \), with \( a_1 < a_2 < \dots < a_k \), none of the sums \( a_i + a_{i+1} \) for \( i = 1, 2, \dots, k-1 \) are divisible by 3.

2. **Case \( n = 2 \)**: Clearly, \( n = 2 \) is a solution because the only number less than 2 and relatively prime to 2 is 1. There are no pairs \( (a_i, a_{i+1}) \) to consider, so the condition is trivially satisfied.

3. **Case \( n \geq 3 \)**: For \( n \geq 3 \), the number of integers less than \( n \) and relatively prime to \( n \) is given by Euler's totient function \( \phi(n) \). For \( n \geq 3 \), \( \phi(n) \) is even.

4. **Odd \( n \)**: If \( n \) were odd, then \( a_2 = 2 \) (since 2 is relatively prime to any odd number). This would imply \( a_1 + a_2 = 1 + 2 = 3 \), which is divisible by 3. This is a contradiction. Hence, \( n \) must be even.

5. **Even \( n \)**: For any \( x \) coprime to \( n \), \( n - x \) is also coprime to \( n \). Therefore, both \( x \) and \( n - x \) are in the set \( \{a_i\} \). Since \( \phi(n) \) is even, we can pair the elements such that \( a_i + a_{k+1-i} = n \). 

6. **Divisibility by 3**: If \( n \) is divisible by 3, then \( n = 3m \) for some integer \( m \). This would imply that \( a_i + a_{i+1} \) could be \( 3m \), which is divisible by 3. Hence, \( n \) cannot be divisible by 3.

7. **Modulo 3 Analysis**: We need \( n \equiv 1 \pmod{3} \) or \( n \equiv 2 \pmod{3} \). If \( n \equiv 2 \pmod{3} \), then \( a_k + a_{k-1} = (n-1) + (n-3) \equiv 0 \pmod{3} \), which is a contradiction. Therefore, \( n \equiv 1 \pmod{3} \).

8. **Checking Small Values**: We check small values of \( n \) that satisfy \( n \equiv 1 \pmod{3} \) and are even:
   - \( n = 4 \): The numbers less than 4 and relatively prime to 4 are 1 and 3. The sum \( 1 + 3 = 4 \) is not divisible by 3.
   - \( n = 10 \): The numbers less than 10 and relatively prime to 10 are 1, 3, 7, and 9. The sums are \( 1 + 3 = 4 \), \( 3 + 7 = 10 \), and \( 7 + 9 = 16 \), none of which are divisible by 3.

9. **Conclusion**: The permissible values of \( n \) are \( n = 2, 4, 10 \).

The final answer is \(\boxed{n = 2, 4, 10}\)