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MathNet 2021 — Part 11 Question 12

Math Olympiad Vault · MathNet 2021 — Part 11

Question 12

Call a positive integer $x$ to be remote from squares and cubes if each integer $k$ satisfies both $|x - k^2| \gt 10^6$ and $|x - k^3| \gt 10^6$. Prove that there exist infinitely many positive integers $n$ such that $2^n$ is remote from squares and cubes.