The rotational band built on the i13/2 proton [660,1/2] Nilsson state in 173Re is proven to be identical to that in 171 Ta. The close similarity of the two bands in 171 Ta and 17aRe suggests that the 17aRe nucleus with the odd proton based on the i13/2 [660,1/2] Nilsson state may be triaxially superdeformed.