Erdős Problem #448 — Dyadic Divisor Blocks and Divisor Density

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Define τ+(n)\tau^+(n) to be the number of integers kk such that nn has a divisor in [2k,2k+1)[2^k,2^{k+1}); equivalently, τ+(n)\tau^+(n) is the cardinality of the image of the divisors of nn under d↦⌊log⁡2d⌋d\mapsto \lfloor\log_2 d\rfloor. Let τ(n)\tau(n) be the number of divisors of nn. Is it true that, for every real ϵ>0\epsilon>0, the set

{n∈N:τ+(n)<ϵ τ(n)}\{n\in\mathbb N: \tau^+(n)<\epsilon\,\tau(n)\}

has natural density 11?

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