User blog comment:Maxywaxy/Do any functions reach this growth rate?/@comment-35470197-20181207044256

1. \(f_{\Gamma_0+1}(n)\)

2. Does a "known growth rate" means a "known precise description (in usual mathematics) of a recursive ordinal with a fixed system of fundamental sequences approximatingly corresponding to the function through FGH"? If so, then it would be functions associated to C-notation or standard OCFs with large cardinals. Otherwise, it would be uncomputable numbers such as Rayo's number and its variants, depending on the meaning of "known".

3. I guess that almost all strong functions in googology are expressed as unary functions because of the strength of FGH. Therefore the answer is the same as that in 2.

4. It would be uncomputable numbers such as Rayo's number and its variants, depending on the meaning of "known" and "understood".