The grideutertethracross is equal to E100(#^^##)^##100 using Extended Cascading-E Notation.[1] The term was coined by Sbiis Saibian.


The name of this number is based on the number "tethracross" and the number "gridgahlah".

Approximations in other notations

Notation Approximation
BEAF \(\{100,100(X \uparrow\uparrow\uparrow X*X^2) 2\}\)[2]
Bird's array notation ???
Fast-growing hierarchy \(f_{\zeta_0^{\omega^2}}(100)\)
Hardy hierarchy \(H_{\zeta_0^{\zeta_0^{\omega^2}}}(100)\)
Slow-growing hierarchy \(g_{\vartheta(\zeta_{\Omega 2}^{\Omega\omega})}(100)\)


  1. Saibian, Sbiis. 4.3.7 Extended Cascading-E Numbers Part IOne to Infinity. Retrieved 2017-01-02.
  2. Using particular notation \(\{a,b (A) 2\} = A\ \&\ a\) with prime b.
Community content is available under CC-BY-SA unless otherwise noted.