Find all positive integers $n$ for which the equation $$(x^2 + y^2)^n = (xy)^{2016}$$ has positive integer solutions.
To find all positive integers \( n \) for which the equation 
\[ (x^2 + y^2)^n = (xy)^{2016} \]
has positive integer solutions, we proceed as follows:

1. **Prime Divisibility Analysis:**
   Let \( p \) be an odd prime. We note that \( p \mid x \iff p \mid y \). Let \( k = \min(\nu_p(x), \nu_p(y)) > 0 \). Then, we have:
   \[
   2nk = \nu_p((x^2 + y^2)^n) = \nu_p((xy)^{2016}) = 2016 (\nu_p(x) + \nu_p(y)) \geq 2016 \times 2k
   \]
   This simplifies to:
   \[
   2nk \geq 4032k \implies n \geq 2016
   \]

2. **Contradiction for \( n \geq 2016 \):**
   Consider the inequality:
   \[
   (xy)^{2016} = (x^2 + y^2)^n \geq (2xy)^n > (xy)^n
   \]
   This implies:
   \[
   (xy)^{2016} > (xy)^n \implies 2016 > n
   \]
   This is a contradiction since we previously found \( n \geq 2016 \). Therefore, no odd primes divide both \( x \) and \( y \).

3. **Power of 2 Analysis:**
   If \( \nu_2(x) \neq \nu_2(y) \), we get a contradiction in a similar fashion. Thus, let \( x = y = 2^m \). Substituting into the equation, we get:
   \[
   (2^{2m+1})^n = (2^{2m})^{2016}
   \]
   Simplifying, we obtain:
   \[
   2n(2m+1) = 2m \times 2016 \implies n(2m+1) = 2m \times 2016
   \]

4. **Divisibility Condition:**
   This gives us:
   \[
   2m + 1 \mid 2016
   \]
   The prime factorization of 2016 is:
   \[
   2016 = 2^5 \times 3^2 \times 7
   \]
   The divisors of 2016 are:
   \[
   \{1, 3, 7, 9, 21, 63\}
   \]
   Therefore:
   \[
   2m + 1 \in \{1, 3, 7, 9, 21, 63\}
   \]
   Solving for \( m \), we get:
   \[
   m \in \{1, 3, 4, 10, 31\}
   \]

5. **Possible Values of \( n \):**
   For each \( m \), we calculate \( n \):
   \[
   n = \frac{2m \times 2016}{2m + 1}
   \]
   Substituting the values of \( m \):
   \[
   \begin{align*}
   m = 1 & \implies n = \frac{2 \times 1 \times 2016}{2 \times 1 + 1} = \frac{4032}{3} = 1344 \\
   m = 3 & \implies n = \frac{2 \times 3 \times 2016}{2 \times 3 + 1} = \frac{12096}{7} = 1728 \\
   m = 4 & \implies n = \frac{2 \times 4 \times 2016}{2 \times 4 + 1} = \frac{16128}{9} = 1792 \\
   m = 10 & \implies n = \frac{2 \times 10 \times 2016}{2 \times 10 + 1} = \frac{40320}{21} = 1920 \\
   m = 31 & \implies n = \frac{2 \times 31 \times 2016}{2 \times 31 + 1} = \frac{124992}{63} = 1984
   \end{align*}
   \]

The final answer is \( \boxed{ n \in \{1344, 1728, 1792, 1920, 1984\} } \).