On the almost universality of $\lfloor x^2/a\rfloor +\lfloor y^2/b\rfloor +\lfloor z^2/c\rfloor$

Abstract

In 2013, Farhi conjectured that for each $m\ge 3$, every natural number $n$ can be represented as $\lfloor x^2/m\rfloor +\lfloor y^2/m\rfloor +\lfloor z^2/m\rfloor$ with $x,y,z\in \mathbb{Z}$, where $\lfloor \cdot \rfloor$ denotes the floor function. Moreover, in 2015, Sun conjectured that every natural number $n$ can be written as $\lfloor x^2/a\rfloor +\lfloor y^2/b\rfloor +\lfloor z^2/c\rfloor$ with $x,y,z\in \mathbb{Z}$, where $a,b,c$ are integers and $(a,b,c)\ne (1,1,1),(2,2,2)$. In this paper, with the help of congruence theta functions, we prove that for each $m\ge 3$, Farhi's conjecture is true for every sufficiently large integer $n$. And for $a,b,c\ge 5$ with $a,b,c$ are pairwisely co-prime, we also confirm Sun's conjecture for every sufficiently large integer $n$.

arXiv comment20 pages. arXiv admin note: text overlap with arXiv:1806.02105