Penintastaculated-tethracross is equal to E100#^^###50 using Extended Cascading-E Notation.[1] The term was coined by Sbiis Saibian.


Notation Approximation
BEAF (using Array of operation) X↑↑X3 & 50 (debatable)
Fast-growing hierarchy \(f_{\eta_0[50]}(100)\)
Hardy hierarchy \(H_{\eta_0[50]}(101)\)


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