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Heptation or septation refers to the 7th hyperoperation. It is equal to $$a \uparrow\uparrow\uparrow\uparrow\uparrow b$$ in Knuth's up-arrow notation.[1][2]

Heptation can be written in array notation as $$\{a,b,5\}$$, in chained arrow notation as $$a \rightarrow b \rightarrow 5$$ and in Hyper-E notation as E(a)1#1#1#1#b.

Heptational growth rate is equivalent to $$f_6(n)$$ in the fast-growing hierarchy.

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