For an integer $n$ with $b$ digits, let a [i]subdivisor[/i] of $n$ be a positive number which divides a number obtained by removing the $r$ leftmost digits and the $l$ rightmost digits of $n$ for nonnegative integers $r,l$ with $r+l<b$  (For example, the subdivisors of $143$ are $1$, $2$, $3$, $4$, $7$, $11$, $13$, $14$, $43$, and $143$). For an integer $d$, let $A_d$ be the set of numbers that don't have $d$ as a subdivisor. Find all $d$, such that $A_d$ is finite.
1. **Understanding the Problem:**
   We need to find all integers \( d \) such that the set \( A_d \) (the set of numbers that don't have \( d \) as a subdivisor) is finite. A subdivisor of a number \( n \) is any positive number that divides a number obtained by removing some digits from the left and/or right of \( n \).

2. **Analyzing the Conditions:**
   - If \( d \) is divisible by 2, then any number composed entirely of odd digits will not have \( d \) as a subdivisor. Since there are infinitely many such numbers, \( A_d \) would be infinite.
   - If \( d \) is divisible by 5, then any number composed entirely of digits other than 0 or 5 will not have \( d \) as a subdivisor. Again, there are infinitely many such numbers, so \( A_d \) would be infinite.

3. **Considering \( d \) with \((d, 10) = 1\):**
   - We need to show that for sufficiently large \( N \), any number with \( N \) or more digits will have \( d \) as a subdivisor.
   - Let \( d \) be such that \((d, 10) = 1\). This means \( d \) is coprime with 10, i.e., \( d \) is not divisible by 2 or 5.

4. **Using the Pigeonhole Principle:**
   - Consider a number with \( k \geq N \) digits. Let \( a_1, a_2, \ldots, a_d \) be any sequence of \( d \) consecutive digits within this number.
   - Form the numbers \( a_d, \overline{a_{d-1}a_d}, \ldots, \overline{a_1a_2\ldots a_d} \). These are the numbers formed by taking the last digit, the last two digits, and so on, up to the last \( d \) digits of the sequence.
   - If any of these numbers is divisible by \( d \), then \( d \) is a subdivisor of the original number.

5. **Applying the Pigeonhole Principle:**
   - If none of these numbers is divisible by \( d \), then by the Pigeonhole Principle, at least two of these numbers must have the same remainder when divided by \( d \).
   - Let these two numbers be \( \overline{a_1a_2\ldots a_i} \) and \( \overline{a_1a_2\ldots a_j} \) with \( i < j \). Their difference, \( \overline{a_1a_2\ldots a_j} - \overline{a_1a_2\ldots a_i} \), is a number of the form \( \overline{a_{i+1}a_{i+2}\ldots a_j000\ldots0} \) (with \( j-i \) zeros at the end).
   - This difference is divisible by \( d \).

6. **Conclusion:**
   - Since \((d, 10) = 1\), \( d \) does not divide any power of 10. Therefore, \( d \) must divide \( \overline{a_{i+1}a_{i+2}\ldots a_j} \).
   - Hence, \( d \) is a subdivisor of the original number.

Thus, for any \( d \) such that \((d, 10) = 1\), the set \( A_d \) is finite.

The final answer is \( \boxed{ d } \) such that \((d, 10) = 1\).