The chainol is equal to s(3,2,2,1,2) in strong array notation.[1] In chained arrow notation, it is equal to a chain of trientri+2 threes.


The name of this number is based on the word "chain", meaning the top of chained arrow notation.


Notation Approximation
BEAF \(\{3,3,3,\{3,3,3\}\}\)
Hyper-E notation \(E2\#\#\#(E(3)1\#1\#3)\)
Hyperfactorial array notation \((4!2)![1,1,2]\)
Fast-growing hierarchy \(f_{\omega^2}(f_4(2))\)
Hardy hierarchy \(H_{\omega^{\omega^2}+\omega^4}(2)\)
Slow-growing hierarchy \(g_{\varphi(\zeta_0,0,0)}(3)\)


  1. Numbers from linear array notation | Steps Toward Infinity!

See alsoEdit

Hyp cos' linear strong array notation numbers | exAN numbers
3-entry series
Tribo group: tribo · tetbo · pentbo · hexabo
Trientri group: trientri · tettro · pentro · hextro
Trientet group: triteto · trientet · penteto · hexteto
Trienpent group: tripeno · tetpeno · trienpent · hexpeno
Trienhex group: trihexo · tethexo · penhexo · trienhex

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