Let $a_0,a_1,a_2,\dots$ be a sequence of nonnegative integers such that $a_2=5$, $a_{2014}=2015$, and $a_n=a_{a_{n-1}}$ for all positive integers $n$. Find all possible values of $a_{2015}$.
1. Given the sequence \(a_0, a_1, a_2, \ldots\) of nonnegative integers such that \(a_2 = 5\), \(a_{2014} = 2015\), and \(a_n = a_{a_{n-1}}\) for all positive integers \(n\), we need to find all possible values of \(a_{2015}\).

2. Start by analyzing the recurrence relation \(a_n = a_{a_{n-1}}\). For \(n = 3\), we have:
   \[
   a_3 = a_{a_2} = a_5
   \]
   Similarly, for \(n = 4\):
   \[
   a_4 = a_{a_3} = a_{a_5}
   \]
   Since \(a_3 = a_5\), it follows that \(a_4 = a_6\).

3. By induction, we can show that for \(n \geq 3\), \(a_n = a_{n+2}\). Assume \(a_k = a_{k+2}\) for all \(3 \leq k < n\). Then:
   \[
   a_n = a_{a_{n-1}} = a_{a_{n-3}} = a_{n-2}
   \]
   Thus, \(a_n = a_{n+2}\).

4. From the above, we have:
   \[
   a_3 = a_5 = a_7 = \ldots = a_{2013} = a_{2015} = \ldots
   \]
   and
   \[
   a_4 = a_6 = a_8 = \ldots = a_{2012} = a_{2014} = 2015
   \]

5. We need to find \(a_{2015}\). Since \(a_{2014} = 2015\), we have:
   \[
   a_{2015} = a_{a_{2014}} = a_{2015}
   \]
   This implies that \(a_{2015}\) must be consistent with the values of \(a_n\) for \(n \geq 3\).

6. Consider the possible values for \(a_{2015}\):
   - If \(a_{2015} = 2015\), then the sequence is consistent as shown above.
   - If \(a_{2015}\) is an even number greater than or equal to 4, say \(a_{2015} = 2k\) where \(k \geq 2\), then:
     \[
     a_{2015} = 2k
     \]
     This is consistent with the recurrence relation since \(a_{2k} = 2015\) for even \(k \geq 2\).

7. Check the remaining cases:
   - If \(a_{2015} = 0\), then \(a_4 = a_{a_3} = a_0\), so \(a_0 = 2015\). But then \(a_1 = a_{a_0} = a_{2015} = 0\), leading to \(a_2 = a_{a_1} = a_0 = 2015\), which contradicts \(a_2 = 5\).
   - If \(a_{2015} = 1\), then \(a_4 = a_{a_3} = a_1\), so \(a_1 = 2015\). But then \(a_2 = a_{a_1} = a_{2015} = 1\), which contradicts \(a_2 = 5\).
   - If \(a_{2015} = 2\), then \(a_4 = a_{a_3} = a_2 = 5\), which contradicts \(a_4 = 2015\).

8. Therefore, the only possible values for \(a_{2015}\) are 2015 and all even integers greater than or equal to 4.

The final answer is \(\boxed{2015, \text{ all even integers} \ge 4}\)