Question 7
Determine all natural numbers $n \geq 2$ that have a representation of the form
$$
n = k^{2} + d^{2}
$$
where $k$ is the smallest divisor of $n$ greater than 1 and $d$ is an arbitrary divisor of $n$.
$$
n = k^{2} + d^{2}
$$
where $k$ is the smallest divisor of $n$ greater than 1 and $d$ is an arbitrary divisor of $n$.