Given a positive integer $m$, let $d(m)$ be the number of positive divisors of $m$. Determine all positive integers $n$ such that $d(n) +d(n+ 1) = 5$.
1. We need to find all positive integers \( n \) such that \( d(n) + d(n+1) = 5 \), where \( d(m) \) denotes the number of positive divisors of \( m \).

2. First, note that \( d(n) \geq 2 \) for any positive integer \( n \) because \( n \) has at least two divisors: 1 and \( n \) itself.

3. Since \( d(n) + d(n+1) = 5 \), the possible pairs \((d(n), d(n+1))\) are \((2, 3)\) and \((3, 2)\) because these are the only pairs of positive integers that sum to 5 and are greater than or equal to 2.

4. If \( d(n) = 2 \), then \( n \) must be a prime number because only prime numbers have exactly two divisors (1 and the number itself).

5. If \( d(n+1) = 3 \), then \( n+1 \) must be the square of a prime number because a number with exactly three divisors must be of the form \( p^2 \), where \( p \) is a prime. This is because the divisors of \( p^2 \) are \( 1, p, \) and \( p^2 \).

6. Conversely, if \( d(n) = 3 \), then \( n \) must be the square of a prime number, and if \( d(n+1) = 2 \), then \( n+1 \) must be a prime number.

7. Let's consider the case where \( n \) is a prime number and \( n+1 = p^2 \) for some prime \( p \):
   - If \( n \) is prime, then \( n = p^2 - 1 \).
   - We need to find \( p \) such that \( p^2 - 1 \) is prime.
   - For \( p = 2 \), \( p^2 - 1 = 4 - 1 = 3 \), which is prime. Thus, \( n = 3 \).

8. Now, let's consider the case where \( n = p^2 \) for some prime \( p \) and \( n+1 \) is prime:
   - If \( n = p^2 \), then \( n+1 = p^2 + 1 \).
   - We need to find \( p \) such that \( p^2 + 1 \) is prime.
   - For \( p = 2 \), \( p^2 + 1 = 4 + 1 = 5 \), which is prime. Thus, \( n = 4 \).

9. Therefore, the possible values of \( n \) are \( 3 \) and \( 4 \).

The final answer is \( \boxed{3, 4} \).