The tethexo is equal to s(4,4,6) in strong array notation. The term was coined by wiki user Hyp cos. It can be represented in up-arrow notation as \(4\uparrow\uparrow\uparrow\uparrow\uparrow\uparrow4\) (4 octated to 4). This number is also equal to s(4,2,7) and s(4,6,1,2).