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D(12) = 1, 2, 3, 4, 6, 12
D(18) = 1, 2, 3, 6, 9, 18
D(28) = 1. 2, 4, 7, 14, 28
D(33) = 1, 3, 11, 33
D(40) = 1, 2, 3, 4, 5, 6, 8, 10, 20, 40.
D(9)= 1, 3, 9