Centicutethracross 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 \(\{100,100(X \uparrow\uparrow\uparrow X*X^X) 2\}\)[2] (weak bound)

{100,100(X↑↑X^2*X^X)2} (strong bound)

Bird's array notation ???
Fast-growing hierarchy (using Veblen's fundamental sequences) \(f_{\zeta_0^{\omega^{\omega}}}(100)\)
Hardy hierarchy \(H_{\zeta_0^{\zeta_0^{\omega^{\omega}}}}(100)\)
Slow-growing hierarchy ???


  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.
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