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Squarefree Numbers

Problem 193

Published on Saturday, 10th May 2008, 01:00 pm; Solved by 1772

A positive integer n is called squarefree, if no square of a prime divides n, thus 1, 2, 3, 5, 6, 7, 10, 11 are squarefree, but not 4, 8, 9, 12.

How many squarefree numbers are there below 250?