Erdős Problem #1100 — If 1=d1<⋯<dτ(n)=n1=d_1<\cdots<d_{\tau(n)}=n are the divisors of nn, then let τ⊥(n)\tau_\perp(n) count the number of ii for which (di,di+1)=1(d_i,d_{i+1})=1.

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If 1=d1<⋯<dτ(n)=n1=d_1<\cdots<d_{\tau(n)}=n are the divisors of nn, then let τ⊥(n)\tau_\perp(n) count the number of ii for which (di,di+1)=1(d_i,d_{i+1})=1. Is it true that τ⊥(n)/ω(n)→∞\tau_\perp(n)/\omega(n)\to \infty for almost all nn? Is it true that τ⊥(n)<exp⁡((log⁡n)o(1))\tau_\perp(n)< \exp((\log n)^{o(1)}) for all nn? Let g(k)=max⁡ω(n)=kτ⊥(n),g(k) = \max_{\omega(n)=k}\tau_\perp(n), where ω(n)\omega(n) counts the number of distinct prime divisors of nn, and nn is restricted to squarefree integers. Determine the growth of g(k)g(k).

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