Tetration level

This category contains numbers that can be expressed or approximated using \(a \uparrow\uparrow b\) with reasonably small values of a and b, but beyond Class 5. Higher ELEMENTARY and the first NONELEMENTARY expressions reside there.

The lower bound of this category is \(10^{10^{10^{10^{10^6}}}}\), and the upper bound is \(10 \uparrow\uparrow\uparrow 3 = 10 \uparrow\uparrow 10 \uparrow\uparrow 10\).