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de 73 son: 1, 7, y 3.
de 49 son: 1, 7, y 49.
de 136 son : 1, 2, 4, 8, 17, 34, 68, y 136.
de 728 son : 1, 2, 4, 7, 8, 13, 14, 26, 28, 52, 56,91, 104, 182, 364, y 728.