SUMSETS CONTAINING A TERM OF A SEQUENCE.

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 and $k\geq {2\beta }/{(\beta -2)}$ or for $\beta>3$ and $k\geq 3$. [ABSTRACT FROM AUTHOR]