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11 August, 15:53

The number 9 has exactly three factors:

1, 3 and 9. Find the next number after 9 that has exactly three factors.

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  1. 11 August, 16:17
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    Numbers with 3 divider are squares of primes.

    2^2 = 4. Div: 1, 2, 4;

    3^3 = 9. Div: 1, 3, 9;

    4^4 = 16. Div: 1, 4, 16;

    5^5 = 25. Div: 1, 5, 25;

    e. t. c.
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