45. Observe the sequence of numbers arranged according to a certain rule: $1, \frac{1}{2}, \frac{1}{3}, \frac{2}{3}, \frac{1}{4}, \frac{2}{4}, \frac{3}{4}, \frac{1}{5}, \frac{2}{5}, \frac{3}{5}, \frac{4}{5} \ldots \ldots$ The numerator of the 2017th number is $\qquad$ , and the denominator is $\qquad$ .
Reference answer: 63, 64