User blog comment:PokémonDude3333/What it would look like if I defined a number/@comment-44079442-20191109205108

A(1) is (3↑↑7625597484987)↑↑(3↑↑7625597484987), which is approximately equal to 3↑↑(7625597484986 + 3↑↑7625597484987) which, with numbers of this size, is not much larger than 3↑↑↑4 (even though you'd have to add another 7.6 trillion 3s to the tower). Multiplying by 3↑↑↑3 isn't even close to adding another 3↑↑↑3 at the bottom of the power tower, and so B(1) is barely larger than A(1).

Also, if I'm not mistaken, the last two digits of AAA(1000) are ...83.