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

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$x,y,z\in\Z$,where$\lfloor\cdot\rfloor$ denotes the floor function. Moreover, in 2015, Sun conjectured that every natural number $n$ can be written as $\lfloor x^2\mathrm{/}a\rfloor +\lfloor y^2\mathrm{/}b\rfloor +\lfloor z^2\mathrm{/}c\rfloor$ with $x,y,z\in \mathbb{Z}$, where $a,b,c$ are integers and $(a,b,c)\neq (1,1,1),(2,2,2)$. 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 $n$.