Find a ground term with the same values as the term $1$;$3$;$9$;$27$ but that has at most two

operators and one set of parenthesis.

Term $1$;$3$;$9$;$27$ has $3$ operators. Term $1.{\mathrm{.}3}^{**}5$ has two operators but its values are not correct

Introduce you answer without blank spaces.