GH from MO's user avatar
GH from MO's user avatar
GH from MO's user avatar
GH from MO
  • Member for 13 years, 3 months
  • Last seen this week
21 votes
Accepted

two's and three's survive in gcd of Lagrange

21 votes
Accepted

Are the 'semi' trivial zeros of $\zeta(s) \pm \zeta(1-s)$ all on the critical line?

21 votes
Accepted

Probability that $n$ is coprime to both $m$ and $m+1$

21 votes
Accepted

How does Yitang Zhang use Cauchy's inequality and Theorem 2 to obtain the error term coming from the $S_2$ sum

21 votes

Why could Mertens not prove the prime number theorem?

21 votes

Is there a set of positive integers of density 1 which contains no infinite arithmetic progression?

21 votes
Accepted

Prove that this expression is greater than 1/2

21 votes
Accepted

Is the diophantine equation $3x^2+1=py^2$ always solvable for each prime $p\equiv 13\pmod{24}$?

20 votes
Accepted

Riemann sum formula for definite integral using prime numbers

20 votes

Only odd primes?

20 votes

What is the simplest proof that the density of primes goes to zero?

20 votes

Is equation $xy(x+y)=7z^2+1$ solvable in integers?

20 votes
Accepted

Which quaternary quadratic form represents $n$ the greatest number of times?

20 votes
Accepted

A diophantine equation in $\mathbb{N}$

20 votes

Finding integer points on elliptic curves via divisibility conditions like $(a+b)^2 \mid (2b^3+6ab^2-1)$

20 votes
Accepted

Green-Tao theorem for 1-central numbers

19 votes

Ideas in the elementary proof of the prime number theorem (Selberg / Erdős)

19 votes
Accepted

Density of fake zeros of Zeta

18 votes
Accepted

Completeness of the sequence $\left \{ \frac{1}{x+1},\frac{1}{x+2},\frac{1}{x+3}, \dots \right \}$ in $L^2[0,1]$

18 votes

How many cubes are the sum of three positive cubes?

18 votes
Accepted

An inequality involving square roots and sums

18 votes

Does $x_0=1/3$ lead to periodicity in the logistic map $x_{k+1}=4x_k(1-x_k)$?

18 votes
Accepted

Is $1 = \sum_{n=1}^{\infty} \frac{\pi(p_n^2)-n+2}{p_n^3-p_n}$ , where $\pi$ denotes the prime counting function and $p_n$ denotes the $n$-th prime?

18 votes
Accepted

An explicit value for a bound proof

18 votes
Accepted

Does the equation $x^2+x=a$ have an integer solution?

18 votes

Many representations as a sum of three squares

18 votes

Is the set $ AA+A $ always at least as large as $ A+A $?

18 votes

Growth of $r_{2}(n)$

18 votes
Accepted

Is $\{ p \alpha \}$ for prime $p$ dense in $[0,1]$?

18 votes

Does Zhang's theorem generalize to $3$ or more primes in an interval of fixed length?

1 2
3
4 5
34