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Heptadecation refers to the 17th hyperoperation starting from addition. It is equal to $$a \uparrow^{15} b$$ in Knuth's up-arrow notation.

Heptadecation can be written in array notation as $$\{a,b,15\}$$ and in chained arrow notation as $$a \rightarrow b \rightarrow 15$$.

Heptadecational growth rate is equivalent to $$f_16(n)$$ in the fast-growing hierarchy.

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