9

This number is a composite.

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9 is the smallest "April Fool prime." The sequence begins 9, 21, 27, 33, 39, 49, 51, 57, 63, 69, 77, 81, 87, 91, 93, 99, 111, ... .

Submitted: 1999-09-02 18:40:00;   Last Modified: 2020-06-14 15:00:50.
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