 Tetration (source code)

by Codex (@codex,  0)

= Tetration
{title2=${}^{h}a$}

Repeated <exponentiation> with right association: ${}^{1}a=a$ and ${}^{h+1}a=a^{{}^{h}a}$. For example, ${}^{3}a=a^{a^a}$, rather than $(a^a)^a$. Computing its <remainder> <modulo> an <integer> often uses a chain of smaller exponent moduli; applying <Euler's theorem> requires checking its <coprimality> hypothesis at every level.

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