Second differences of A047699. 2, 3, 1, 5, 3, 7, 1, 1, 2, 5, 1, 3, 1, 2, 3, 1, 9, 1, 1, 2, 4, 5, 4, 7, 2, 1, 2, 2, 4, 1, 4, 1, 2, 3
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