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Erdős problem 884

For a natural number n, let 1=d1<<dτ(n)=n1 = d_1 < \dotsc < d_{\tau(n)} = n denote the divisors of n in increasing order. Does it hold that 1i<jτ(n)1djdi1+1i<τ(n)1di+1di\sum_{1 \le i < j \le \tau(n)} \frac{1}{d_j - d_i} \ll 1 + \sum_{1 \le i < \tau(n)} \frac{1}{d_{i + 1} - d_i} for nn \to \infty`, i.e. \sum_{1 \le i < j \le \tau(n)} \frac{1}{d_j - d_i} \in O \left( 1 + \sum_{1 \le i < \tau(n)} \frac{1}{d_{i + 1} - d_i}) \right)?
Retained from Formal Conjectures · not edited here
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Accepted in Vela Mathematics Program

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