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Composite numbers having three factors are the squares of all prime numbers. Examples are 4 (1 2 4), 9 (1 3 9), 25 (1 5 25), 49 (1 7 49), 121 (1 11 121), 169 (1 13 169), 289 (1 17 289), 361 (1 19 361), etc.

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16y ago

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