MathOverflow
Ofir Gorodetsky's user avatar
Ofir Gorodetsky's user avatar
Ofir Gorodetsky's user avatar
Ofir Gorodetsky
  • Member for 11 years, 2 months
  • Last seen this week
Profile Activity

125 Answers

Score Activity Newest
8 votes
Accepted

Density of primes $p$ where $p-1$ has a prime factor exceeding $p^{2/3}$

3 votes
Accepted

Selberg sieve for counting monic irreducible $P \in \mathbb{F}_q[t]$ such that $P + K$ is also irreducible

1 vote

Expressions for binomial residue sum $\sum_{k=0}^n {n \choose k} x^k \left( \frac{k}{q} \right)$

5 votes
Accepted

Large sieve type inequality

7 votes

Bounding the $n$-th derivatives of $\frac{1-\cos(x)}{x^2}$

9 votes
Accepted

A simple way to bound the density of sums of two odd squares

44 votes
Accepted

What is the simplest proof that the density of coprime pairs does not go to zero?

14 votes
Accepted

For any integer $n>6$, does there always exist a prime $p>n+1$ such that $p\mid 2^n-1$?

5 votes

How many solutions are there to $n_1^2-n_2^2-n_3^2+n_4^2=k$?

12 votes
Accepted

Fermat cubic hypersurfaces over finite fields

11 votes
Accepted

Zero-free regions of $\zeta(s)$ equivalent to prime number theorems with error bound

19 votes
Accepted

On the error term of the Riemann explicit formula

8 votes
Accepted

Does there exist a comprehensive compilation of Erdos's open problems?

3 votes

On 12 cfracs: for Catalan's $K$, Gieseking's $\kappa$, and $\pi^2$, $\pi^3$, plus three for $\zeta(3)$ using Zagier's "six sporadic sequences"

12 votes
Accepted

Asymptotic behavior of a "strange" arithmetic function

10 votes
Accepted

Average value of the prime omega function $\Omega$ on predecessors of prime powers

16 votes
Accepted

Mertens-like theorem

25 votes
Accepted

A generalisation of theorem of Landau on sum of two squares?

7 votes
Accepted

Sumset-distinct numbers

5 votes
Accepted

Vanishing of a product of cyclotomic polynomials in characteristic 2

5 votes
Accepted

Positivity of partial Dirichlet series for a quadratic character?

6 votes

Convergence of series related to partial fraction expansion of cotangent function

22 votes
Accepted

Places where one can post open problems

1 vote

Weak Siegel–Walfisz property

45 votes
Accepted

Are there any Fibonacci numbers that are sandwiched between twin primes?

5 votes
Accepted

Results using a certain kind of identity

6 votes

Reference request for the explicit formula for $\sum_{n\leq x} \Lambda(n)n^{-s}$

8 votes

Proving Mertens' theorem using the prime number theorem

8 votes
Accepted

Where odious numbers meet arithmetic progressions

10 votes
Accepted

Sum of a Poisson point process

1
2 3 4 5