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The recursive H function from Godel, Escher, Bach.
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| (defn h | |
| "The recursive H function from Godel, Escher, Bach: takes | |
| in an integer n and returns H(n) = n - H(H(H(n-1))), with H(0) = 0." | |
| [n] | |
| (if (= n 0) | |
| 0 | |
| (- n (h (h (h (- n 1))))))) |
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