Determine all positive integers $k$ for which there exist positive integers $r$ and $s$ that satisfy the equation $$(k^2-6k+11)^{r-1}=(2k-7)^{s}.$$
To determine all positive integers \( k \) for which there exist positive integers \( r \) and \( s \) that satisfy the equation 
\[
(k^2 - 6k + 11)^{r-1} = (2k - 7)^s,
\]
we will analyze different cases for \( k \).

1. **Case \( k = 1 \):**
   \[
   (1^2 - 6 \cdot 1 + 11)^{r-1} = (2 \cdot 1 - 7)^s \implies 6^{r-1} = (-5)^s.
   \]
   Since \( 6^{r-1} \) is always positive and \( (-5)^s \) is negative for odd \( s \), there is no solution for \( k = 1 \).

2. **Case \( k = 2 \):**
   \[
   (2^2 - 6 \cdot 2 + 11)^{r-1} = (2 \cdot 2 - 7)^s \implies 3^{r-1} = (-3)^s.
   \]
   This equation is satisfied when \( r-1 = 2 \) and \( s = 2 \), i.e., \( r = 3 \) and \( s = 2 \). Therefore, \( k = 2 \) is a solution.

3. **Case \( r = 1 \):**
   \[
   (k^2 - 6k + 11)^0 = (2k - 7)^s \implies 1 = (2k - 7)^s.
   \]
   This implies \( 2k - 7 = 1 \) or \( 2k - 7 = -1 \):
   \[
   2k - 7 = 1 \implies 2k = 8 \implies k = 4,
   \]
   \[
   2k - 7 = -1 \implies 2k = 6 \implies k = 3.
   \]
   Therefore, \( k = 3 \) and \( k = 4 \) are solutions.

4. **Case \( r \geq 2 \) and \( k \geq 5 \):**
   \[
   (k^2 - 6k + 11)^{r-1} = (2k - 7)^s.
   \]
   Since \( 2k - 7 \geq 3 \), there exists an odd prime divisor \( p \) of \( 2k - 7 \). Thus, \( p \mid k^2 - 6k + 11 \). Given \( 2k \equiv 7 \pmod{p} \), we have:
   \[
   0 \equiv 4(k^2 - 6k + 11) = (2k)^2 - 12 \cdot (2k) + 44 \equiv 7^2 - 12 \cdot 7 + 44 = 49 - 84 + 44 = 9 \pmod{p}.
   \]
   This implies \( p \mid 9 \), so \( p = 3 \). Therefore, there exist positive integers \( u \) and \( v \) such that:
   \[
   (k - 3)^2 + 2 = 3^u,
   \]
   \[
   2k - 7 = 3^v.
   \]
   Substituting \( 2k = 3^v + 7 \) into the first equation:
   \[
   (3^v + 7 - 6)^2 + 2 = 3^u \implies (3^v + 1)^2 + 2 = 3^u.
   \]
   Simplifying:
   \[
   3^{2v} + 2 \cdot 3^v + 9 = 4 \cdot 3^u,
   \]
   \[
   3^{2v-2} + 2 \cdot 3^{v-2} + 1 = 4 \cdot 3^{u-2}.
   \]
   Since \( k \geq 5 \), we have:
   \[
   3^u = (k - 3)^2 + 2 \geq 6 \implies u \geq 2.
   \]
   Also, \( v \geq 2 \). If \( u, v \geq 3 \), then \( 3 \mid 1 \), which is a contradiction. Thus, \( u = 2 \) or \( v = 2 \).

   - If \( u = 2 \):
     \[
     (3^v + 1)^2 = 28 \implies \text{no solution}.
     \]
   - If \( v = 2 \):
     \[
     2k - 7 = 9 \implies k = 8.
     \]
     Substituting \( k = 8 \):
     \[
     (8 - 3)^2 + 2 = 25 + 2 = 27 = 3^3 \implies u = 3.
     \]
     Thus, \( k = 8 \) is a solution.

Conclusion:
The positive integer \( k \) is strong if and only if \( k \in \{2, 3, 4, 8\} \).

The final answer is \( \boxed{ k \in \{2, 3, 4, 8\} } \).