User blog comment:Primussupremus/Alphabet notation+example./@comment-24920136-20170305170458/@comment-30754445-20170305231729

Nearly all of Primussepremus/Swoop's numbers looked like that...

And the Marmalade thing is pointless anyway, since chain arrow notation is way stronger than what he did he here. Z(Marmalade)=Marmalade to any reasonable kind of accuracy.

At any rate, you dont really need to count the 1's to know that [the nth step] ~ 10↑↑n give or take a few 10's in the power tower. Assuming there are between 10,000 and 1,000,000 ones there, a reasonable approximation would be [the nth step] ~ 10↑↑(n+2), so Z=10↑↑28 (or "F28" in Letter Notation, which I'm not using here for obvious reasons)