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30, 32, 33, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50

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βˆ™ 7y ago
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βˆ™ 14y ago

The perfect squares:

4: 1, 2 and 4

9: 1, 3 and 9

16: 1, 2, 4, 8 and 16

25: 1, 5 and 25

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βˆ™ 8y ago

31, 37, 41, 43 and 47 have exactly 2 factors.

The others have more than 2.

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βˆ™ 12y ago

2, 3, 5, 7, 11, 13, 17, 19, 23 and 29

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βˆ™ 9y ago

The even numbers. 2, 4, 6 and so on.

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βˆ™ 12y ago

The primes: 2,3,5,7,11,13,17 and 19.

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βˆ™ 11y ago

31, 37, 41, 43, 47

Pick three.

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βˆ™ 12y ago

22

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Q: What is a number between 20 and 30 that has 2prime factors?
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