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Deutero-quartigoldgahlah is equal to E100#^####*#^####*#100 using Cascading-E notation[1]. The term was coined by YouTuber Douglas Shamlin Jr.

Approximations[]

Notation Approximation
BEAF \(\{100,100 (4)(4) 100\}\)
Bird's array notation \(\{100,100 [5] 1 [5] 100\}\)
Fast-growing hierarchy \(f_{\omega^{\omega^42+1}}(100)\)
Hardy hierarchy \(H_{\omega^{\omega^{\omega^42+1}}}(100)\)

Sources[]