Are there infinitely many odd integers n for which n - 2^u, 1 ≤ 2^u ≤ n is never squarefree? In fact is there any such an integer?

Erdős Problem #11 — Odd $n$ with $n-2^u$ never squarefree

Erdős

Are there infinitely many odd integers $n$ for which $n - 2^u$ , $1 \le 2^u \le n$ is never squarefree? In fact is there any such an integer?

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3 weeks ago

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