Icosalogue

The icosalogue is equal to E1#20, using Hyper-E notation.Sbiis Saibian's Ultimate Large Numbers List The term was coined by Sbiis Saibian. In up-arrow notation it can be written \(10 \uparrow\uparrow 20\).
This number is also called existron.
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=== Etymology ===
The name of this number is based on Greek prefix "icosa-", another term for 20 and the word "logarithm".
=== Approximations in other notations ===
Notation 	Approximation
Up-arrow notation 	\(10 \uparrow\uparrow 20\) (exact)
Chained arrow notation 	\(10 \rightarrow 20 \rightarrow 2\) (exact)
BEAF 	\(\{10,20,2\}\) (exact)
Hyperfactorial array notation	\(22!1\)
Fast-growing hierarchy 	\(f_3(19)\)
Hardy hierarchy 	\(H_{(\omega^2) 19}(28)\)
Slow-growing hierarchy 	\(g_{\epsilon_0}(20)\)
=== Sources ===
=== See also ===
Icosalogue
Icosalogue
Category:Hyper-E numbers
Category:3 entry linear
Category:Tetration level
Category:Greek-based name
Category:-logue
Category:Doogol Regiment