A wobbly number is a positive integer whose $digits$ in base $10$ are alternatively non-zero and zero the units digit being non-zero. Determine all positive integers which do not divide any wobbly number.
1. **Base Case:**
   - For \( k = 1 \), we take \( w_1 = 4 \). Clearly, \( 4^1 = 4 \) divides \( w_1 \), but \( 2 \cdot 4^1 = 8 \) does not divide \( w_1 \).

2. **Inductive Step:**
   - Assume for some \( k \), there exists a wobbly number \( w_k \) with \( 2k-1 \) digits such that \( 4^k \) divides \( w_k \), but \( 2 \cdot 4^k \) does not.
   - We need to construct \( w_{k+1} \) such that \( 4^{k+1} \) divides \( w_{k+1} \), but \( 2 \cdot 4^{k+1} \) does not.
   - Let \( w_{k+1} = m_k \cdot 100^k + w_k \) where \( m_k \in \{1, 2, \ldots, 9\} \).
   - We want \( 4^{k+1} \mid w_{k+1} \) but \( 2 \cdot 4^{k+1} \nmid w_{k+1} \).
   - Since \( w_k = 4^k w'_k \) for some odd \( w'_k \), we have:
     \[
     w_{k+1} = m_k \cdot 100^k + w_k = m_k \cdot 4^k \cdot 25^k + 4^k w'_k
     \]
   - We need:
     \[
     4^{k+1} \mid m_k \cdot 4^k \cdot 25^k + 4^k w'_k \implies 4 \mid m_k \cdot 25^k + w'_k \mod 8
     \]
   - This simplifies to:
     \[
     4 \equiv m_k \cdot 25^k + w'_k \mod 8
     \]
   - Since \( w'_k \) is odd, \( w'_k \mod 8 \) is an odd number. We can always find \( m_k \) such that \( m_k \cdot 25^k + w'_k \equiv 4 \mod 8 \).

3. **Existence of Wobbly Multiples:**
   - Let \( s \) be a wobbly number with \( 2j-1 \) digits.
   - Consider \( s_k = \sum_{m=0}^{k-1} 100^{j \cdot m} s \). This is still a wobbly number.
   - We have:
     \[
     s_k = s \cdot \frac{100^{kj} - 1}{100^j - 1}
     \]
   - To find a multiple of \( s \) that is also a multiple of \( n \), take \( k = \varphi((100^j - 1) \cdot n) \) where \( \varphi \) is Euler's totient function.
   - This ensures:
     \[
     100^{kj} \equiv 1 \mod ((100^j - 1) \cdot n)
     \]
   - Thus, \( s_k \) is a wobbly number and a multiple of \( sn \).

4. **Conclusion:**
   - For any integer \( n \) coprime to \( 2 \) and \( 5 \), there exists a wobbly number that is a multiple of \( n \).
   - No wobbly number can be a multiple of \( 25 \) because all multiples of \( 25 \) end in \( 00, 25, 50, 75 \), which are not allowed for wobbly numbers.
   - Similarly, no wobbly number can be a multiple of \( 10 \).

The final answer is \( \boxed{ n } \) such that \( n \) is not divisible by \( 10 \) or \( 25 \).