User blog comment:Swooped me in one hit/slackitack number/@comment-29310326-20170214075425/@comment-30754445-20170214140438

"Or in chained arrow, it is exactly 3→3→(3→3→3)→2, right?"

It's a very very good approximation, but it isn't exact.

If we set g1 = 3→3→1→2 = 3→3 = 27, it would be exact.

And username's BEAF approximation.is - again - a slightly different number. There we'll need to set g1 = {3,1,1,2} = 3.

Of-course, when we're going 3↑↑↑3 levels deep, the difference between 3 and 27 and 3↑↑↑↑3 is completely negligible. Indeed:

3→3→(3→3→3)→2 < g(3↑↑↑3) < 3→3→((3→3→3) + 1)→2

and:

{3,{3,3,3}+1,1,2} < g(3↑↑↑3) < {3,{3,3,3}+2,1,2}