There are $\tfrac{n(n+1)}{2}$ distinct sums of two distinct numbers, if there are $n$ numbers.
For which $n \ (n \geq 3)$ do there exist $n$ distinct integers, such that those sums are $\tfrac{n(n-1)}{2}$ consecutive numbers?
1. **Understanding the problem**: We need to find for which \( n \) (where \( n \geq 3 \)) there exist \( n \) distinct integers such that the sums of all pairs of these integers form \( \binom{n}{2} \) consecutive numbers. 

2. **Initial cases**: 
   - For \( n = 3 \), consider the integers \( 1, 2, 3 \). The sums are \( 1+2=3 \), \( 1+3=4 \), and \( 2+3=5 \). These sums are \( \binom{3}{2} = 3 \) consecutive numbers: \( 3, 4, 5 \).
   - For \( n = 4 \), consider the integers \( 1, 2, 3, 5 \). The sums are \( 1+2=3 \), \( 1+3=4 \), \( 1+5=6 \), \( 2+3=5 \), \( 2+5=7 \), and \( 3+5=8 \). These sums are \( \binom{4}{2} = 6 \) consecutive numbers: \( 3, 4, 5, 6, 7, 8 \).

3. **General case for \( n > 5 \)**:
   - Let \( a_1, a_2, \ldots, a_n \) be \( n \) distinct integers.
   - Suppose the sums are \( t+1, t+2, \ldots, t+\binom{n}{2} \).
   - The smallest sum is \( a_1 + a_2 = t+1 \) and the largest sum is \( a_{n-1} + a_n = t + \binom{n}{2} \).
   - We also have \( a_1 + a_3 = t+2 \) and \( a_{n-2} + a_n = t + \binom{n}{2} - 1 \).

4. **Analyzing the sums**:
   - From \( a_1 + a_2 = t+1 \) and \( a_1 + a_3 = t+2 \), we get \( a_3 = a_2 + 1 \).
   - From \( a_{n-2} + a_n = t + \binom{n}{2} - 1 \) and \( a_{n-1} + a_n = t + \binom{n}{2} \), we get \( a_{n-1} = a_{n-2} + 1 \).
   - Therefore, \( a_3 + a_{n-2} = a_2 + a_{n-1} \).

5. **Contradiction for \( n > 5 \)**:
   - Since \( a_3 = a_2 + 1 \) and \( a_{n-1} = a_{n-2} + 1 \), we have \( a_3 + a_{n-2} = (a_2 + 1) + a_{n-2} = a_2 + (a_{n-2} + 1) = a_2 + a_{n-1} \).
   - This implies \( a_3 = a_2 + 1 \) and \( a_{n-1} = a_{n-2} + 1 \) are not distinct, which is a contradiction since all \( a_i \) are distinct.

6. **Case for \( n = 5 \)**:
   - Let \( a_3 = x \), \( a_2 = x-1 \), \( a_4 = x+1 \), and \( a_1 \) and \( a_5 \) be chosen such that the sums \( 2x-1, 2x, 2x+1 \) are within the range \( t+1, t+2, \ldots, t+10 \).
   - This requires checking specific values to ensure all sums are consecutive, which can be done through case analysis.

The final answer is \( \boxed{ n = 3 } \) and \( n = 4 \). For \( n > 5 \), it is not possible.