User Jan-Christoph Schlage-Puchta

3 votes

Is $\liminf \frac{\sigma_{k}(({2}^{m-1})({2^m-1}))}{\phi_{k}(({2}^{m-1})({2^m-1}))}$ finite for every $k$?

answered Dec 31, 2015 at 10:04

3 votes

Asymptotics of a recursion

answered Dec 31, 2015 at 14:59

3 votes

Does there exist another form of the derivative for polynomials?

answered Jun 16, 2019 at 15:54

2 votes

Accepted

A good upper-bound for the cardinal of an interval of finite groups

answered Jun 4, 2016 at 6:38

2 votes

least integer for a related factorial

answered Jun 7, 2016 at 18:48

2 votes

Accepted

Exponential sum estimates similar to the one for $\sum_p (\log p) e(p \alpha)$, but for different sequences

answered Dec 24, 2015 at 12:08

2 votes

Accepted

Bombieri-Vinogradov in short intervals

answered Dec 22, 2014 at 9:33

2 votes

Function with zeros plus/minus the primes

answered Sep 6, 2013 at 18:26

2 votes

Sums Of Independent Random Variables: Pathological Behaviour

answered Apr 25, 2014 at 8:49

2 votes

Generalization on Coupon Collector's Problem

answered Nov 29, 2013 at 13:18

2 votes

What is the probability two random maps on n symbols commute?

answered Sep 25, 2013 at 9:38

2 votes

Divisor sums over values of binary forms of primes

answered Aug 12, 2014 at 11:44

2 votes

Accepted

quotient of planar groups

answered Oct 1, 2014 at 15:38

2 votes

Accepted

Arithmetic progressions in finitely generated groups

answered Apr 9, 2017 at 12:51

2 votes

Accepted

Is there some estimate numbers of the tuples come from Mobius function?

answered Nov 24, 2017 at 20:54

2 votes

Accepted

Density of integers with a large rough divisor

answered Aug 9, 2018 at 12:36

2 votes

Accepted

Relate solutions to a polynomial system in complex numbers to solutions in a finite field

answered Dec 20, 2018 at 11:56

2 votes

Old books you would like to have reprinted with high-quality typesetting

answered Dec 23, 2018 at 16:44

2 votes

Modern Algebraic Geometry and Analytic Number Theory

answered Feb 26, 2019 at 15:59

2 votes

Accepted

The maximum difference between the number of elements in the two sets of equal length of consecutive numbers that divisible by some prime numbers

answered Jun 12, 2019 at 10:43

2 votes

How much space between these smooth numbers?

answered Nov 21, 2016 at 22:05

2 votes

Examples of Sets with Positive Upper Density

answered Jul 24, 2016 at 11:23

2 votes

A sieve with two parameters

answered Dec 17, 2016 at 10:11

2 votes

Accepted

are endomorphisms "small" compared to the full transformations?

answered Jan 4, 2017 at 17:40

1 vote

Is it possible to show that :for $n \geq 1:\sigma(n!-1) $ never be prime and why $\sigma(n!-1)\bmod 10 $ at most is $0$?

answered Nov 26, 2016 at 22:15

1 vote

Estimating $\sum_{p_1\cdots p_k\leq n} \frac{1}{p_1\cdots p_k}$ for various $k$

answered Dec 3, 2016 at 18:32

1 vote

A question about numbers

answered Feb 3, 2017 at 9:32

1 vote

Lebesgue measure of the set $\frac{1+x}{1+y}$ with $x,y$ in a fat Cantor

answered Jan 17, 2017 at 19:46

1 vote

Reference book for primality testing

answered Aug 10, 2016 at 12:39

1 vote

Minimal number of different values in the sequence $(\mu(d_i)\varphi(d_i))_{i=\overline{{1,\tau(m)}}}$

answered Jul 2, 2016 at 12:03

Stack Exchange Network

144 Answers

Is $\liminf \frac{\sigma_{k}(({2}^{m-1})({2^m-1}))}{\phi_{k}(({2}^{m-1})({2^m-1}))}$ finite for every $k$?

Asymptotics of a recursion

Does there exist another form of the derivative for polynomials?

A good upper-bound for the cardinal of an interval of finite groups

least integer for a related factorial

Exponential sum estimates similar to the one for $\sum_p (\log p) e(p \alpha)$, but for different sequences

Bombieri-Vinogradov in short intervals

Function with zeros plus/minus the primes

Sums Of Independent Random Variables: Pathological Behaviour

Generalization on Coupon Collector's Problem

What is the probability two random maps on n symbols commute?

Divisor sums over values of binary forms of primes

quotient of planar groups

Arithmetic progressions in finitely generated groups

Is there some estimate numbers of the tuples come from Mobius function?

Density of integers with a large rough divisor

Relate solutions to a polynomial system in complex numbers to solutions in a finite field

Old books you would like to have reprinted with high-quality typesetting

Modern Algebraic Geometry and Analytic Number Theory

The maximum difference between the number of elements in the two sets of equal length of consecutive numbers that divisible by some prime numbers

How much space between these smooth numbers?

Examples of Sets with Positive Upper Density

A sieve with two parameters

are endomorphisms "small" compared to the full transformations?

Is it possible to show that :for $n \geq 1:\sigma(n!-1) $ never be prime and why $\sigma(n!-1)\bmod 10 $ at most is $0$?

Estimating $\sum_{p_1\cdots p_k\leq n} \frac{1}{p_1\cdots p_k}$ for various $k$

A question about numbers

Lebesgue measure of the set $\frac{1+x}{1+y}$ with $x,y$ in a fat Cantor

Reference book for primality testing

Minimal number of different values in the sequence $(\mu(d_i)\varphi(d_i))_{i=\overline{{1,\tau(m)}}}$