Lluosrifau 4: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, Nid ydynt yn luosrifau o 4: 2, 6, 10, 14, 18, 22, 26, 30, 34, 38, 42, 46,

Pa rifau sy'n luosrifau o 4?

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