Heptastaculated-tethrathoth is equal to E100#^^##7 using Extended Cascading-E Notation.[1] The term was coined by Sbiis Saibian.

Approximations in other notations

Notation Approximation
BEAF X^^^8 & 100
Bird's array notation {100,7[1\1\2]2}
Fast-growing hierarchy \(f_{\zeta_0[7]}(100)\)
Hardy hierarchy \(H_{\zeta_0[7]}(101)\)
Slow-growing hierarchy ???


  1. Saibian, Sbiis. 4.3.7 Extended Cascading-E Numbers Part IOne to Infinity. Retrieved 2017-01-02.
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