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Published online by Cambridge University Press: 18 September 2023
Let $S=\{s_{1}, s_{2}, \ldots \}$ be an unbounded sequence of positive integers with
$s_{n+1}/s_{n}$ approaching
$\alpha $ as
$n\rightarrow \infty $ and let
$\beta>\max (\alpha , 2)$. We show that for all sufficiently large positive integers l, if
$A\subset [0, l]$ with
$l\in A$,
$\gcd A=1$ and
$|A|\geq (2-{k}/{\lambda \beta })l/(\lambda +1)$, where
$\lambda =\lceil {k}/{\beta }\rceil $, then
$kA\cap S\neq \emptyset $ for
$2<\beta \leq 3$ and
$k\geq {2\beta }/{(\beta -2)}$ or for
$\beta>3$ and
$k\geq 3$.
This work was supported by the National Natural Science Foundation of China (Grant Nos. 11071033, 12371003) and the Top Talents Project of Anhui Department of Education (Grant No. gxbjZD05).