Given a positive integer $m$. Let
$$A_l = (4l+1)(4l+2)...(4(5^m+1)l)$$
for any positive integer $l$. Prove that there exist infinite number of positive integer $l$ which
$$5^{5^ml}\mid A_l\text{ and } 5^{5^ml+1}\nmid A_l$$
and find the minimum value of $l$ satisfying the above condition.
1. **Understanding the Problem:**
   We need to prove that there exist infinite positive integers \( l \) such that \( 5^{5^m l} \mid A_l \) and \( 5^{5^m l + 1} \nmid A_l \), where \( A_l = (4l+1)(4l+2)\cdots(4(5^m+1)l) \). Additionally, we need to find the minimum value of \( l \) satisfying this condition.

2. **Using \( v_p \) Notation:**
   The \( v_p \) notation represents the highest power of a prime \( p \) dividing a number. For factorials, we use the formula:
   \[
   v_p(n!) = \frac{n - s_p(n)}{p-1}
   \]
   where \( s_p(n) \) is the sum of the digits of \( n \) in base \( p \).

3. **Applying the Formula:**
   We apply this to \( A_l \):
   \[
   v_5(A_l) = \frac{4 \cdot 5^m \cdot l + 4l - s_5(4 \cdot 5^m \cdot l + 4l) - 4l + s_5(4l)}{4}
   \]
   Simplifying, we get:
   \[
   v_5(A_l) = 4 \cdot 5^m \cdot l - \frac{s_5(4 \cdot 5^m \cdot l + 4l) - s_5(4l)}{4}
   \]

4. **Condition for \( l \):**
   We need \( s_5(4 \cdot 5^m \cdot l + 4l) = s_5(4l) \). This implies that the sum of the digits in base 5 of \( 4 \cdot 5^m \cdot l + 4l \) should be equal to the sum of the digits of \( 4l \).

5. **Choosing \( l \):**
   Let \( l = \frac{5^k - 1}{4} \) where \( k \geq m+1 \). Then:
   \[
   s_5(4l) = s_5(5^k - 1) = 4k
   \]
   Now, consider:
   \[
   s_5(4 \cdot 5^m \cdot l + 4l) = s_5(5^{m+k} - 5^m + 5^k - 1)
   \]
   Since \( 5^{m+k} \) and \( 5^k \) are powers of 5, their digit sums are 1. Thus:
   \[
   s_5(5^{m+k} - 5^m + 5^k - 1) = s_5(5^{m+k} + (5^k - 5^m - 1)) = 1 + 4k - 1 = 4k
   \]
   This proves the first part.

6. **Finding the Minimum \( l \):**
   We need to show that \( l = \frac{5^{m+1} - 1}{4} \) is the smallest number satisfying the condition. We count the number of digits in \( 4l \) in base 5. Since we need \( s_5(4 \cdot 5^m \cdot l + 4l) = s_5(4l) \), we need at least \( m+1 \) digits. Thus, \( 4l = \sum_{i=0}^m c_i 5^i \) where \( c_i \in \{0,1,2,3,4\} \) and \( c_m \neq 0 \).

7. **Ensuring \( c_m = 4 \):**
   If \( c_m \neq 4 \), then \( s_5(4 \cdot 5^m \cdot l + 4l) > s_5(4l) \). Therefore, \( c_m = 4 \) and \( c_i = 4 \) for all \( i = 0, 1, 2, \ldots, m \). This means:
   \[
   4l = 5^{m+1} - 1 \implies l = \frac{5^{m+1} - 1}{4}
   \]

The final answer is \( \boxed{ l = \frac{5^{m+1} - 1}{4} } \)