User blog comment:Superman37891/Explain Rayo please/@comment-30754445-20170622112528/@comment-31607182-20170622132942

Very helpful explanation, thanks for that!

Small correction: Rayo(10) = 1, since it's defined as "the smallest number greater than all numbers nameable in n letters"

And I also have a question: Are there functions that can not be defined in FOST? So will there ever be an faster growing function that's based on a completely different idea than "take n letters to define the biggest number in language X" ?