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Trigintation refers to the 30th hyperoperation starting from addition. It is equal to the binary function $$\uparrow^{28}$$, using Knuth's up-arrow notation.[1]

"a trigintated to b" can be written in array notation as $$\{a,b,28\}$$, in chained arrow notation as $$a \rightarrow b \rightarrow 28$$ and in Hyper-E notation as E[a]1#1#1#1...1#1#1#b (27 ones).

Trigintational growth rate is approximately equivalent to $$f_{29}(n)$$ in the fast-growing hierarchy.