Bi-Fyn is a number equal to 20(76) using Revised Pehan Notation.[1] The term was coined by Licorneuhh.

It is also equal to 176(76) = 17576(76)


Notation Approximation
BEAF \(\{76,76,77,2\}\)
Chained arrow notation \(76\rightarrow 76\rightarrow 76\rightarrow 78\)
Strong array notation s(76,77,78,2)
Hyperfactorial array notation 76![78]
Fast-growing hierarchy \(f_{\omega+77}(76)\)
Hardy hierarchy \(H_{\omega^{\omega+77}}(76)\)
Slow-growing hierarchy (using this system of fundamental sequences) \(g_{\varphi(1,76,0)}(77)\)


  1. Fyn Group | Licorneuhh's numbers site (retrieved at UTC 10:55 09/01/2021)
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