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That's an infinite list. Numbers with three factors are the squares of prime numbers.

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12y ago

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3, 6, 9, 12, 15 and just keep adding three until you get to infinity.

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12y ago
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All prime squares have just three factors. Example: 9, 25

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12y ago
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Squares of prime numbers

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11y ago
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Q: What are all the numbers that have three factors?
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