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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

Master concepts by solving fun, challenging problems.

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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