activity
20222026
most citedSolutions to some sign change problems on the functions involving sums of divisors

1 citations · 1 across the 4 of their papers we have counts for

collaborators

5 papers

math.NT2026

An improved upper bound on the Ruzsa number

Yuchen Ding, Yu-Chen Sun, Lilu Zhao

Let be the least positive integer such that there exists a set with for which the number of ordered solutions of wi…

math.NT2026

An improved lower bound for odd integers not of the form

Yuchen Ding, Yu-Chen Sun, Lilu Zhao

Let be sufficiently large and \[ N(x)=\big|\bigl\{n\le x:n\ \text{is odd and }n\ne p+2^a+2^b \textrm{ with } p \text{ a prime and } a,b\in \mathbb{N}\bigr\}\big|. \] Motivated…

math.NT2025

Problems 66 and 67 on sums of residue classes and primes of András Sárközy's collection of unsolved problems

Yuchen Ding, Christian Elsholtz, Yu-Chen Sun

In this note, we discuss two problems of Sárközy (2001). In particular, we prove an optimal result on sumsets of sparse subset of primes.

math.NT2024★ 1 cited

Solutions to some sign change problems on the functions involving sums of divisors

Yuchen Ding, Hao Pan, Yu--Chen Sun

In this note, we solve some sign change problems on the functions involving sums of divisors posed by Pongsriiam recently.

math.NT2022

A note on additive complements of the squares

Yuchen Ding, Yu-Chen Sun, Li-Yuan Wang +1

Let be the set of squares and be an additive complement of so that $\mathcal…