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Doevigintation refers to the 22nd hyperoperation. It is equal to $$a \uparrow^{20} b$$, using Knuth's up-arrow notation. [1]

Doevigintation can be written in array notation as $$\{a,b,20\}$$, in chained arrow notation as $$a \rightarrow b \rightarrow 20$$ and in Hyper-E notation as E(a)1#1#1#1...1#1#1#b (19 ones).

Doevigintational growth rate is equivalent to $$f_{21}(b)$$ in the fast-growing hierarchy.

### Sources Edit

1. Hyper Operators by Aarex Tiaokhiao