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Any number that is not a multiple of 2 or 3.

The first few are: 5, 7, 11, 13, 17, 19, 23, 25, 29, 31, 35, 37, 41, 43, 47, 49, 53, 55

Also, it may be of interest to note that adding or subtracting 1 also yields such a number. (In this case, 287 and 289).

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14y ago

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