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Question Number 90470 by Asif Hypothesis last updated on 23/Apr/20

$$Foranypositiveintegern,\tau \left(n\right)isthenumberofitsfactors$$$$Prove,$$$$\sum _{i=1}^n\tau \left(i\right)=\sum _{i=1}^n\lfloor n/i\rfloor$$

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