1975 IMO Problems/Problem 2

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Problem

Let $a_1, a_2, a_3, \cdots$ be an infinite increasing sequence of positive integers. Prove that for every $p \geq 1$ there are infinitely many $a_m$ which can be written in the form\[a_m = xa_p + ya_q\]with $x, y$ positive integers and $q > p$.

Solution