2^^^...2 is 4 for any number of up-arrows. 3^^^3 is the first, simplest Knuth number (a three, three up-arrows, and a three) to give stupendously large values, far outstripping 2^^^4 or 4^^^2.
Ah ha, upon wiki’ing, I was bungling how up-arrow notation worked. Thank you!
2^^^...2 is 4 for any number of up-arrows. 3^^^3 is the first, simplest Knuth number (a three, three up-arrows, and a three) to give stupendously large values, far outstripping 2^^^4 or 4^^^2.
Ah ha, upon wiki’ing, I was bungling how up-arrow notation worked. Thank you!