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Numbers having 12 factors

Number Theory Level 3

Five positive integers less than 100 have exactly 12 factors (inclusive of 1 and itself).

What is the sum of these five numbers?

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Excel in math and science

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It's hard to learn from lectures and videos

Learn more effectively through short, interactive explorations.

Used and loved by over 6 million people

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including olympiad champions, researchers, and professionals.

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by Paul Fournier

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