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They are members of the set of numbers of the form 21*k where k is a positive integer which is less than 143.

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6y ago
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8y ago

3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60, 63, 66, 69, 72, 75, 78, 81, 84, 87, 90, 93, 96, 99.

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10y ago

3, 6, 9, 12, 15, 18, 21

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9y ago

They are: 3 6 9 12 15 18 21 24 27 and 30

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Q: What are the multiples of 21 up to 3000?
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