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squarefree numbers

A square-free integer is not divisible by the square of any prime number.

The first few squarefree numbers are: 2, 3, 5, 6, 7, 10, 11, 13, 14, 15, 17, …

607,926 of the first one million positive integers are squarefree.

Learn more about squarefree numbers on wikipedia.

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