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Is there a way to represent Knuth's up-arrow notation in Wolfram|Alpha?

Posted 10 years ago
POSTED BY: James Counterman

Wolfram|Alpha understands some Mathematica syntax, for example the last 6 digits of 2 ?? 10 can be computed by

Nest[Mod[2^#, 10^6] &, 1, 10]

W|A link, see also Power Tower at Mathworld.

POSTED BY: Ilian Gachevski
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