We show that such integers $m_{1}, \ldots, m_{15}$ do not exist. Suppose that the equation is satisfied by some integers $m_{1}, \ldots, m_{15}$. Then the argument of the complex number $z_{1}=1+16 i$ coincides with the argument of the complex number $$z_{2}=(1+i)^{m_{1}}(1+2 i)^{m_{2}}(1+3 i)^{m_{3}} \cdots \cdots(1+15 i)^{m_{15}}$$ Therefore the ratio $R=z_{2} / z_{1}$ is real (and not zero). As $\operatorname{Re} z_{1}=1$ and $\operatorname{Re} z_{2}$ is an integer, $R$ is a nonzero integer. By considering the squares of the absolute values of $z_{1}$ and $z_{2}$, we get $$\left(1+16^{2}\right) R^{2}=\prod_{k=1}^{15}\left(1+k^{2}\right)^{m_{k}}$$ Notice that $p=1+16^{2}=257$ is a prime (the fourth Fermat prime), which yields an easy contradiction through $p$-adic valuations: all prime factors in the right hand side are strictly below $p$ (as $k<16$ implies $1+k^{2}<p$ ). On the other hand, in the left hand side the prime $p$ occurs with an odd exponent.