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D(325) = 1, 5, 13, 25, 65, 325
D(90) = 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
D(4) = 1, 2, 4
D(12) = 1, 2, 3, 4, 6, 12