User blog comment:Milesman34/Value of this number? (Googolpentrupleplexian)/@comment-30754445-20170625054411

Due to the weird way that large numbers work, you could actually replace the first number in each row with a "10" and it won't change the numbers by much.

Bottom line, you can approximate Googolpentruplexian (stage 5) as:

10↑↑↑↑↑10↑↑↑↑10↑↑↑10↑↑googolplexian.

Which is between 10↑↑↑↑↑↑2 (10→2→6) and 10↑↑↑↑↑↑3 (10→3→6).

(In my letter notation it will be between J5 = 10→10→5 and J6 = 10→10→6. It's somewhere around J5.11, I believe)