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Anonymous
How about 10 whose factors are 1 2 5 and 10
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6: 1, 2, 3, 6
8: 1, 2, 4, 8
10: 1, 2, 5, 10
14: 1, 2, 7, 14
15: 1, 3, 5, 15
They are 6, 8, 10, 14 and 15.