simplify (2^3)^5
$$\\(2^3)^5=8^5$$
$${{\mathtt{8}}}^{{\mathtt{5}}} = {\mathtt{32\,768}}$$
2^3^5
$${{\left({{\mathtt{2}}}^{{\mathtt{3}}}\right)}}^{{\mathtt{5}}} = {\mathtt{32\,768}}$$