On perfect powers that are sums of cubes of a three term arithmetic progression

Abstract

Using only elementary arguments, Cassels and Uchiyama (independently) determined all squares that are sums of three consecutive cubes. Zhongfeng Zhang extended this result and determined all perfect powers that are sums of three consecutive cubes. Recently, the equation $(x-r{)}^k+x^k+(x+r{)}^k$ has been studied for $k=4$ by Zhongfeng Zhang and for $k=2$ by Koutsianas. In this paper, we complement the work of Cassels, Koutsianas and Zhang by considering the case when $k=3$ and showing that the equation $(x-r{)}^3+x^3+(x+r{)}^3=y^n$ with $n\ge 5$ a prime and $0<r\le 10^6$ only has trivial solutions $(x,y,n)$ which satisfy $xy=0$.

11 pages

References in corpus (2)

• On the Diophantine equation $(x+1{)}^k+(x+2{)}^k+...+(2x{)}^k=y^n$
• Perfect powers that are sums of consecutive squares

Cited by in corpus (1)

• On perfect powers that are sums of cubes of a five term arithmetic progression