A number of the form n↑...↑_︸_n n, where Knuth up-arrow notation has been used. The first few Ackermann numbers are 1↑1 = 1, 2↑↑2 = 4, and 3↑↑↑3 = 3^(3^(·^(·^(·^3)))) _︸_7625597484987.
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