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Prime numbers, diophantine equations, diophantine approximations, analytic or algebraic number theory, arithmetic geometry, Galois theory, transcendental number theory, continued fractions

13 votes
Accepted

Small $|2^x 3^y - 5^z 7^t|$ and generalization

Baker's theorem implies that $$ |\log (A/B)| = |\sum e_i \log p_i - \sum f_j \log q_j| > \max (e_i, f_j)^{-C} $$ where $C$ depends only on $\{p_i\}, \{q_j\}$. Since $A \leq \left( \prod p_i \right) …
Itai Bar-Natan's user avatar
11 votes
1 answer
491 views

$p$-adic sums of $p$ terms

My question is inspired by this riddle: Let $p \geq 5$ be prime, and let $$ 1 + \frac 1 2 + \frac 1 3 + \dots + \frac 1 {p-1} = \frac a b $$ where $a/b$ is the fraction expressed in lowest terms. Sh …
Itai Bar-Natan's user avatar
4 votes
Accepted

Determining if a number is k-rough without factoring

First of all, I don't think you should dismiss searching for a prime factor as a method for determining whether a number is $k$-rough. The Elliptic Curve Method (ECM) is a prime factorization algorith …
Itai Bar-Natan's user avatar
2 votes

Density of the Klarner-Rado Sequence

I have performed a heuristic calculation of the density of the Klarner-Rado sequence. My calculation suggests that the Klarner's conjecture is false. Instead, I expect the number of terms in the Klarn …
Itai Bar-Natan's user avatar