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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.

5 votes
Accepted

$L^1$ norm for a product of cosines

Since I was asked to in the comments, let me record here some very simple observations. They boil down to the following inequality: for all $k \ge N$ we have $$I_{k - N} \min_{x\in \mathbb{R}} h_N(x) …
Aleksei Kulikov's user avatar
23 votes

Is the sum of the reciprocals of the products of pairs of coprime positive integers and thei...

I have no idea if it is known, but here is the proof: First of all, we can remove the coprimality condition by factoring out the gcd and just prove that $S=\sum_{a, b = 1}^\infty \frac{1}{ab(a+b)} = 2 …
Aleksei Kulikov's user avatar
7 votes

Probability of large gcd

To get a bound which is worse than the one of GH from MO asymptotically, but which doesn't require any case checking, we can do the following: if $\gcd(t, N) = k$, then $\frac{N}{k} = d$ which is an i …
Aleksei Kulikov's user avatar
7 votes
Accepted

A question about Schwartz-type functions used in analytic number theory

The answer to your question is yes, and it is a pretty well-understood topic. First of all $X$ is more or less irrelevant for the bounds in 4) so let us take $X = Y$, say, for convenience. Second, w …
Aleksei Kulikov's user avatar
4 votes
Accepted

Is the abscissa of convergence of $s\mapsto\sum_{n>0}(ng_{n}/2)^{-s}$ known?

Well, the abscissa of convergence is $1$, though I see no way to deduce anything about it from the Polignac conjecture. $\sigma_P \le 1$ is obvious from $|\zeta_P(s)| \le \zeta(\Re s)$, while for $\si …
Aleksei Kulikov's user avatar
4 votes
Accepted

A truncated divisor sum

I will prove below that your bound $\frac{\exp\left(C\frac{\log N}{\log \log N}\right)}{A^3}$ (which follows from $\sum_{d\mid N, d > A} \frac{1}{d^3} \le \frac{d(N)}{A^3}$) is optimal at least in the …
Aleksei Kulikov's user avatar