Issou is a number equal to 1[0,1]0(76) using Revised Pehan Notation.[1] The term was coined by Licorneuhh.

It is also equal to 7676[76]76(76).


Notation Approximation
BEAF \(\{76,76,76,76,76,76\}\)
Hyper-E notation \(\textrm E76\#\#\#\#\#76\)
Hyperfactorial array notation 76![1,1,4]
Fast-growing hierarchy \(f_{\omega^4}(76)\)
Hardy hierarchy \(H_{\omega^{\omega^4}}(76)\)
Slow-growing hierarchy (using this system of fundamental sequences) \(g_{\varphi(\omega,\omega,\omega,\omega,0)}(76)\)


  1. Issou Group | Licorneuhh's numbers site (retrieved at UTC 19:06 15/01/2021)
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