Answer
$$p > 1$$
Work Step by Step
$$\eqalign{
& \int_1^\infty {{x^{ - p}}dx} = \frac{1}{{p - 1}}{\text{ if }}p > 1 \cr
& {\text{The integral converges if }}p > 1 \cr
& {\text{The integral diverges if }}p \leqslant 1 \cr} $$
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