The dustaculated-tethrathoth (also called tethri-centatetratediterator) is equal to E100#^^#>#^^#100 using Extended Cascading-E Notation.[1] The term was coined by Sbiis Saibian.

Approximations in other notations

Notation Approximation
BEAF X^^X^^X & 100 (weak bound)

X^^(2X) & 100 (strong bound)

Bird's array notation ???
Fast-growing hierarchy \(f_{\varepsilon_{\varepsilon_0}}(100)\)
Hardy hierarchy \(H_{\varepsilon_{\varepsilon_0}}(101)\)
Slow-growing hierarchy ???


  1. Saibian, Sbiis. 4.3.7 Extended Cascading-E Numbers Part IOne to Infinity. Retrieved 2017-01-11.