Rational And Its Sum

Number Theory Level 2

Clearly, $1 + \dfrac{1}{1} = 2$ .

Does there exist another positive rational number $r$ , such that the sum of the number and its reciprocal is an integer?

$r + \dfrac{1}{r} \in \mathbb{N}, r \neq 1, r \in \mathbb{Q}^+$