$1+2+3+4+5+6=6+7+8$.
What is the smallest number $k$ greater than $6$ for which:
$1 + 2 +...+ k = k + (k+1) +...+ n$, with $n$ an integer greater than $k$ ?
1. We start with the given equation:
   \[
   1 + 2 + 3 + \cdots + k = k + (k+1) + (k+2) + \cdots + n
   \]
   We need to find the smallest number \( k \) greater than 6 for which this equation holds, with \( n \) being an integer greater than \( k \).

2. First, we use the formula for the sum of the first \( k \) natural numbers:
   \[
   \sum_{i=1}^k i = \frac{k(k+1)}{2}
   \]
   Similarly, the sum of the numbers from \( k+1 \) to \( n \) is:
   \[
   \sum_{i=k+1}^n i = \sum_{i=1}^n i - \sum_{i=1}^k i = \frac{n(n+1)}{2} - \frac{k(k+1)}{2}
   \]

3. Setting these two sums equal gives:
   \[
   \frac{k(k+1)}{2} = \frac{n(n+1)}{2} - \frac{k(k+1)}{2}
   \]
   Simplifying, we get:
   \[
   k(k+1) = n(n+1) - k(k+1)
   \]
   \[
   2k(k+1) = n(n+1)
   \]
   \[
   n(n+1) = 2k(k+1)
   \]

4. To solve for \( n \) in terms of \( k \), we rearrange the equation:
   \[
   n^2 + n = 2k^2 + 2k
   \]
   \[
   n^2 + n - 2k^2 - 2k = 0
   \]
   This is a quadratic equation in \( n \). Solving for \( n \) using the quadratic formula \( n = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \), where \( a = 1 \), \( b = 1 \), and \( c = -2k^2 - 2k \):
   \[
   n = \frac{-1 \pm \sqrt{1 + 8k^2 + 8k}}{2}
   \]
   \[
   n = \frac{-1 \pm \sqrt{1 + 8k(k+1)}}{2}
   \]

5. For \( n \) to be an integer, the discriminant \( 1 + 8k(k+1) \) must be a perfect square. Let:
   \[
   1 + 8k(k+1) = m^2
   \]
   for some integer \( m \). Rearranging, we get:
   \[
   m^2 - 1 = 8k(k+1)
   \]
   \[
   (m-1)(m+1) = 8k(k+1)
   \]

6. We need to find the smallest \( k > 6 \) such that \( 1 + 8k(k+1) \) is a perfect square. We test values of \( k \) starting from 7:
   - For \( k = 7 \):
     \[
     1 + 8 \cdot 7 \cdot 8 = 1 + 448 = 449
     \]
     449 is not a perfect square.
   - For \( k = 8 \):
     \[
     1 + 8 \cdot 8 \cdot 9 = 1 + 576 = 577
     \]
     577 is not a perfect square.
   - For \( k = 9 \):
     \[
     1 + 8 \cdot 9 \cdot 10 = 1 + 720 = 721
     \]
     721 is a perfect square (\( 721 = 27^2 \)).

7. Therefore, the smallest \( k \) greater than 6 for which the equation holds is \( k = 9 \).

The final answer is \( \boxed{9} \).