JEE Math Practice Question

Let $a_{1}, a_{2}, a_{3}, \ldots$ be a sequence of positive integers in arithmetic progression with common difference 2. Also, let $b_{1}, b_{2}, b_{3}, \ldots$ be a sequence of positive integers in geometric progression with common ratio 2. If $a_{1}=b_{1}=c$, then what is the number of all possible values of $c$, for which the equality \[ 2\left(a_{1}+a_{2}+\cdots+a_{n}\right)=b_{1}+b_{2}+\cdots+b_{n} \] holds for some positive integer $n$?