Lluosrifau 3: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, Nid ydynt yn lusorifau o 3: 5, 8, 10, 13, 19, 22, 23, 26, 29, 31, 37, 40,

Pa rifau sy'n luosrifau o 3?

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