User blog comment:DontDrinkH20/"Interesting numbers" and the 3 Classes of Googolisms/@comment-27513631-20180813194237/@comment-36540075-20180813195701

Actually, after further consideration, the complexity of \(a = S(S(0)) + S(S(0))\) is the smallest \(n\) such that \(\ulcorner S(S(0)) + S(S(0))\urcorner\in T_n\), which happens to be 5, not 3.