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On the blending of real/complex analysis with number theory. The study involves distribution of prime numbers and other problems and helps giving asymptotic estimates to these.

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0 answers
84 views

Cardinality of a subset of smooth numbers

Recall: An $n$-smooth number is an integer whose prime factors are all less than or equal to $n$. Let $k$ and $N$ two integers with $0\leq k\leq N$. Let's put $H= \{n\in[0,N]\ s.t.\ n\ is\ k-smooth\} …
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  • 43
0 votes
0 answers
135 views

An estimate of a sum

I'm looking for an estimate of this sum $\sum_{n\leq x} \frac{\mu^2(n)}{\varphi(n)}$ where $\mu$ is the Möbius function and $\varphi$ the Euler's totient function. Thanks a lot.
khattab's user avatar
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4 votes
1 answer
277 views

Rough numbers in short interval

A positive integer $n$ is called $k$-rough if all of the prime factors of $n$ strictly exceed $k$. For $k$ fixed and $n$ large, what's the shortest interval $[n,n+t]$ that contains a $k$-rough number …
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