Problem 43684. 0, 2, 0, -2, 0, 2, 0, -2, ...

f(x) = 0, 2, 0, -2, 0, 2, 0, -2, ..., for x = 1, 2, 3, 4, 5, 6, 7, 8, ...

Solution Comments

Problem Recent Solvers81

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