For each integer $k\ge2$, the decimal expansions of the numbers $1024,1024^2,\dots,1024^k$ are concatenated, in that order, to obtain a number $X_k$.  (For example, $X_2 = 10241048576$.)  If \[ \frac{X_n}{1024^n} \] is an odd integer, find the smallest possible value of $n$, where $n\ge2$ is an integer.

[i]Proposed by Evan Chen[/i]
1. **Define the problem and notation:**
   We need to find the smallest integer \( n \geq 2 \) such that \(\frac{X_n}{1024^n}\) is an odd integer. Here, \( X_n \) is the concatenation of the decimal expansions of \( 1024, 1024^2, \ldots, 1024^n \).

2. **Understanding the problem:**
   We need to find the smallest \( n \) such that \( \frac{X_n}{1024^n} \) is an odd integer. This implies that \( X_n \) must be divisible by \( 1024^n \) but not by \( 2 \times 1024^n \).

3. **Calculate the number of digits in \( 1024^k \):**
   Since \( 1024 \approx 10^3 \), the number of digits in \( 1024^k \) is approximately \( 3k + 1 \).

4. **Calculate \( X_2 \):**
   \[
   X_2 = 1024 \cdot 10^{7} + 1024^2
   \]
   \[
   1024 = 2^{10}
   \]
   \[
   1024^2 = (2^{10})^2 = 2^{20}
   \]
   \[
   X_2 = 2^{10} \cdot 10^7 + 2^{20}
   \]
   \[
   X_2 = 2^{10} \cdot 10^7 + 2^{20} = 2^{10} \cdot (10^7 + 2^{10})
   \]
   Since \( 10^7 + 2^{10} \) is odd, \( v_2(X_2) = 10 \).

5. **Calculate \( X_3 \):**
   \[
   X_3 = 1024 \cdot 10^{17} + 1024^2 \cdot 10^{10} + 1024^3
   \]
   \[
   1024^3 = (2^{10})^3 = 2^{30}
   \]
   \[
   X_3 = 2^{10} \cdot 10^{17} + 2^{20} \cdot 10^{10} + 2^{30}
   \]
   \[
   X_3 = 2^{10} \cdot (10^{17} + 2^{10} \cdot 10^{10} + 2^{20})
   \]
   Since \( 10^{17} + 2^{10} \cdot 10^{10} + 2^{20} \) is odd, \( v_2(X_3) = 10 \).

6. **Calculate \( X_4 \):**
   \[
   X_4 = 1024 \cdot 10^{30} + 1024^2 \cdot 10^{23} + 1024^3 \cdot 10^{13} + 1024^4
   \]
   \[
   1024^4 = (2^{10})^4 = 2^{40}
   \]
   \[
   X_4 = 2^{10} \cdot 10^{30} + 2^{20} \cdot 10^{23} + 2^{30} \cdot 10^{13} + 2^{40}
   \]
   \[
   X_4 = 2^{10} \cdot (10^{30} + 2^{10} \cdot 10^{23} + 2^{20} \cdot 10^{13} + 2^{30})
   \]
   Since \( 10^{30} + 2^{10} \cdot 10^{23} + 2^{20} \cdot 10^{13} + 2^{30} \) is even, \( v_2(X_4) > 10 \).

7. **Calculate \( X_5 \):**
   \[
   X_5 = 1024 \cdot 10^{46} + 1024^2 \cdot 10^{39} + 1024^3 \cdot 10^{29} + 1024^4 \cdot 10^{16} + 1024^5
   \]
   \[
   1024^5 = (2^{10})^5 = 2^{50}
   \]
   \[
   X_5 = 2^{10} \cdot 10^{46} + 2^{20} \cdot 10^{39} + 2^{30} \cdot 10^{29} + 2^{40} \cdot 10^{16} + 2^{50}
   \]
   \[
   X_5 = 2^{10} \cdot (10^{46} + 2^{10} \cdot 10^{39} + 2^{20} \cdot 10^{29} + 2^{30} \cdot 10^{16} + 2^{40})
   \]
   Since \( 10^{46} + 2^{10} \cdot 10^{39} + 2^{20} \cdot 10^{29} + 2^{30} \cdot 10^{16} + 2^{40} \) is odd, \( v_2(X_5) = 10 \).

8. **Conclusion:**
   The smallest \( n \) such that \( \frac{X_n}{1024^n} \) is an odd integer is \( n = 5 \).

The final answer is \( \boxed{5} \)