A note on balancing binomial coefficients

preprint2015arXivOpen access

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)+...+(x−15)=(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.

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