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D(66) = 1, 2, 3, 6, 11, 22, 33, 66 = 144
D(70) = 1, 2, 5, 7, 10, 14, 35, 70 = 144
D(81) = 1, 3, 9, 27, 81 = 144
D(94) = 1, 2, 47, 94 = suma = 144
la propiedad en comun es que todos tienen 36 ava.
otra propiedad comun es que todos tiene al 1 y al 2 como divisor.