English

A note on balancing binomial coefficients

Number Theory 2015-10-06 v2

Abstract

In 2014, T. Komatsu and L. Szalay studied the balancing binomial coefficients. In this paper, we focus on the following Diophantine equation (15)+(25)+...+(x15)=(x+15)+...+(y5)\binom{1}{5}+\binom{2}{5}+...+\binom{x-1}{5}=\binom{x+1}{5}+...+\binom{y}{5} where y>x>5y>x>5 are integer unknowns. We prove that the only integral solution is (x,y)=(14,15)(x,y)=(14,15). Our method is mainly based on the linear form in elliptic logarithms.

Keywords

Cite

@article{arxiv.1412.6736,
  title  = {A note on balancing binomial coefficients},
  author = {Shane Chern},
  journal= {arXiv preprint arXiv:1412.6736},
  year   = {2015}
}

Comments

Several minor corrections. Final version published in Proc. Japan Acad. Ser. A Math. Sci

R2 v1 2026-06-22T07:39:38.152Z