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15 September, 23:19

Find all 2-digit natural numbers that have exactly three factors.

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  1. 16 September, 02:29
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    16, 25, 36, 49, 64, 81 are all the 2 digit numbers that have exactly three factors.

    Why?

    For any number x, 1 and x are its factors obviously. So if the number is not a perfect square it will have more than or equal to 2+2 factors. Hence only the numbers mentioned were counted.
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