Lluosrifau 3: 3, 6, 9, 15, 18, 21, 27, 30, 33, Llusorifau 4: 4, 8, 16, 20, 28, 32, 40, 44, 46, Lluosrifau 3 a 4: 12, 24, 36,

Pa rifau sy'n luosrifau o 3, llusorifau o 4 neu'n luosrifau o 3 a 4?

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