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Interesting 3

Number Theory Level 2

What is interesting about the number 3?

Every integer is interesting

3 is the only integer whose spelling has more letters than its numerical value 3 is the only prime that is one less than a multiple of 4 3 is the only prime that is one less than a perfect square 3 is the only multiple of 3 that is 1 more than a prime

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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 Calvin Lin

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