Determine all positive integers $n$ such that for every positive devisor $ d $ of $n$, $d+1$ is devisor of $n+1$.
1. **Assume \( d < n \) is a divisor of \( n \).** 
   - Given \( d \mid n \), we can write \( n = kd \) for some integer \( k \).
   - We need to show that \( d + 1 \mid n + 1 \).

2. **Express \( n + 1 \) in terms of \( d \) and \( k \):**
   - Since \( n = kd \), we have \( n + 1 = kd + 1 \).

3. **Check the divisibility condition:**
   - We need \( d + 1 \mid kd + 1 \).
   - This implies \( kd + 1 \equiv 0 \pmod{d + 1} \).

4. **Simplify the congruence:**
   - Rewrite the congruence as \( kd \equiv -1 \pmod{d + 1} \).
   - This means there exists an integer \( m \) such that \( kd = m(d + 1) - 1 \).

5. **Analyze the implications:**
   - Rearrange to get \( kd = md + m - 1 \).
   - Simplify to \( kd - md = m - 1 \).
   - Factor out \( d \) to get \( d(k - m) = m - 1 \).

6. **Consider the smallest prime divisor \( p \) of \( n \):**
   - Let \( p \) be the smallest prime divisor of \( n \).
   - Choose \( d = \frac{n}{p} \), then \( d \mid n \) and \( d + 1 \mid n + 1 \).

7. **Substitute \( d = \frac{n}{p} \) into the inequality:**
   - From the inequality \( \frac{n - d}{d(d + 1)} \geq 1 \), we get \( n > d^2 \).
   - Substituting \( d = \frac{n}{p} \), we get \( n > \left(\frac{n}{p}\right)^2 \).

8. **Simplify the inequality:**
   - This simplifies to \( n > \frac{n^2}{p^2} \).
   - Rearrange to get \( p^2 > n \).

9. **Conclude that \( n = p \):**
   - Since \( p \) is the smallest prime divisor of \( n \), and \( p^2 > n \), the only possibility is \( n = p \).
   - Therefore, \( n \) must be a prime number.

10. **Verify the condition for odd primes:**
    - If \( n = p \) where \( p \) is an odd prime, then the divisors of \( n \) are \( 1 \) and \( p \).
    - For \( d = 1 \), \( d + 1 = 2 \) and \( 2 \mid p + 1 \) since \( p \) is odd.
    - For \( d = p \), \( d + 1 = p + 1 \) and \( p + 1 \mid p + 1 \).

11. **Conclude that the only solutions are odd primes:**
    - The condition \( d + 1 \mid n + 1 \) holds for all divisors \( d \) of \( n \) if and only if \( n \) is an odd prime.

\(\blacksquare\)

The final answer is \( \boxed{ n } \) is an odd prime.