Decuple-terrible tethrathoth is equal to E100#^^#>#11 in Extended Cascading-E Notation.[1] The term was coined by Sbiis Saibian.


The name of this number is based on the prefix "decuple" and the number "terrible tethrathoth".

Approximations in other notations

Notation Approximation
BEAF \(\{100,100 ((X \uparrow)^{X} 11) 2\}\)[2]
Bird's array notation \(\{100,100 [1 \backslash 3] 2\}\)
X-Sequence Hyper-Exponential Notation \(100\{X\uparrow\uparrow X\text{>} X\}11\)
Fast-growing hierarchy \(f_{\varepsilon_{10}}(100)\)
Hardy hierarchy \(H_{\varepsilon_{10}}(101)\)
Slow-growing hierarchy \(g_{\vartheta(\varepsilon_{\Omega 11 + 1})}(100)\)


  1. Sbiis Saibian, 4.3.7 Extended Cascading-E Numbers Part I
  2. Using particular notation \(\{a,b (A) 2\} = A\ \&\ a\) with prime b.

See also

Community content is available under CC-BY-SA unless otherwise noted.