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edited Jan 4, 2023 at 9:11

make the question comprehensible

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edited Jan 24, 2012 at 11:41

Can anyone give an estimate (Upperupper bound or Lower Boundlower bound) for

$\sum_{\substack{d|P_r \\ \frac{\sqrt P_r}{2}< d <\sqrt P_r }} 1 $

when the number of divisors $d\mid P_r$ such that $\frac{\sqrt{P_r}}{2}< d < \sqrt{P_r}$, where $P_r$ is the product of firstthe $r$ smallest primes?

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asked Jan 24, 2012 at 1:37

Estimate about primes

Can anyone give an estimate(Upper bound or Lower Bound) for

$\sum_{\substack{d|P_r \\ \frac{\sqrt P_r}{2}< d <\sqrt P_r }} 1 $

when $P_r$ is product of first primes?

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