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An integer is called square-free if it has no squares as factors other than 1. In other words, a square-free integer has no repeated prime factors in its prime factorization.

The square-free integers up to 100 are 1, 2, 3, 5, 6, 7, 8, X, E, 11, 12, 13, 15, 17, 19, 1X, 1E, 22, 25, 26, 27, 29, 2X, 2E, 31, 32, 33, 35, 36, 37, 3X, 3E, 43, 45, 47, 49, 4X, 4E, 51, 52, 55, 56, 57, 59, 5X, 5E, 61, 62, 65, 66, 67, 6X, 6E, 71, 72, 73, 75, 77, 79, 7X, 7E, 81, 85, 86, 87, 89, 8X, 8E, 91, 92, 93, 95, 96, 97, 9X, 9E, X2, X3, X7, X9, XX, XE, E1, E2, E5, E6, E7, E9, EX, EE.