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A241079
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If n is a perfect square, a(n) = 0. If n is not a perfect square, a(n) is the number of final digits necessary to rule out n as a perfect square, or -1 if cannot be ruled out as a perfect square using any group of final digits.
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0
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0, 1, 1, 0, 2, 2, 1, 1, 0, 2, 2, 1, 1, 2, 2, 0, 1, 1, 2, 2, 3, 1, 1, 4, 0, 2, 1, 1, 3, 2, 2, 1, 1, 2, 2, 0, 1, 1, 2, 2, -1, 1, 1, 4, 2, 2, 1, 1, 0, 2, 2, 1, 1, 2, 2, 4, 1, 1, 2, 2, 3, 1, 1, 0, 2, 2, 1, 1, 3, 2, 2, 1, 1, 2, 2, 4, 1, 1, 2, 2, 0, 1, 1, 5, 2, 2, 1
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