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2001 IMO Shortlist Problems/N3

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Problem

Let a_1 = 11^{11}, \, a_2 = 12^{12}, \, a_3 = 13^{13}, and a_n = |a_{n - 1} - a_{n - 2}| + |a_{n - 2} - a_{n - 3}|, n \geq 4. Determine a_{14^{14}}.

Solution

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Resources

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