Erick Wong

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182 Answers

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11
Two $NP$-complete languages whose union is in $P$?
10
Prove or disprove $\lim\limits_{n \to \infty} (p_{n+1} - p_{n})/\sqrt{p_n} = 0$
9
Travelling salesman and NP Hard
9
Irreducibility of $x^5 -x -1$ by reduction mod 5
8
Does the series $ \sum\limits_{n=1}^{\infty} \frac{1}{n^{1 + |\sin(n)|}} $ converge or diverge?
8
How many primes $p$ are there such that $2p^{3} + 206$ is a perfect square?
7
Which is the better approximation to $e$?
7
Prove that if $n$ is a perfect number, $kn$ is not
7
Values taken by Euler's phi function
7
Find the value of $\frac{1}{d_1}+\frac{1}{d_2}+\dots+\frac{1}{d_k}$.
7
Determining the number $N$
7
Counting zero-digits between 1 and 1 million
7
Criterion for convergence of the sequence of powers of a linear operator to $0$
7
A complex map with “bounded” derivative is injective
6
Number Theory and combinatorial
6
Is $M(x)=O(x^σ)$ possible with $σ≤1$ even if the Riemann hypothesis is false?
6
How to prove that $p-1$ is squarefree infinitely often?
6
On the gaps between consecutive primes
5
Check the continuity and differentiability of $f(x)= \sin^{-1}(\cos x)$ at $x=0$
5
Does this matrix have strictly positive eigenvalues?
5
Sum of squares of sum of squares function $r_2(n)$
5
GCD to LCM of multiple numbers
5
Apparent patterns in ratios of consecutive primes
5
Are $4ab\pm 1 $ and $(4a^2\pm 1)^2$ coprime?
5
Converse of the Erdős Conjecture on Arithmetic Progressions
5
Uniform convergence of sum from entire infinite product
5
If $A+A^T$ is negative definite, the eigenvalues of $A$ have negative real parts?
5
Blocks in sequences from {1,…,k}
5
Count the number of n-bit strings with an even number of zeros.
5
For what $(n,k)$ there exists a polynomial $p(x) \in F_2[x]$ s.t. $\deg(p)=k$ and $p$ divides $x^n-1$?
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