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Centation refers to the 100th hyperoperation starting from addition. It is equal to the binary function $$\uparrow^{98}$$, using Knuth's up-arrow notation. [1] "a centated to b" is also $$\{a,b,98\}$$ in BEAF, $$\textrm E[a]\underbrace{1\#1\#1...1\#1\#1}_{97}\#b$$ in Hyper-E notation and $$a \rightarrow b \rightarrow 98$$ in chained arrow notation.

Centational growth rate is approximately equivalent to $$f_{99}(n)$$ in the fast-growing hierarchy.