Lluosrifau o 7: 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, Nid ydynt yn luosrifau o 7: 9, 13, 16, 23, 24, 27, 34, 41, 47, 59, 64, 74,

Pa rifau sy'n luosrifau o 7?

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