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I think you mean some common multiples. Since 17 is prime, there are no common factors of 17 and 21. Now the first common multiple will be 21x17. You can use more 21s or more 17s to find additional multiples. Here is one 17x21x21 Here is another 17x17x21

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15y ago
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Q: What are some multiples of 21 and 17?
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