Posted by Nikki on Saturday, November 10, 2007 at 10:59pm.
http://en.wikipedia.org/wiki/Prime_number
So ... which of these can be divided evenly only by itself and 1?
??
Which one(s) are evenly divisible by prime numbers less than the sqrt of the number. The square root of the largest is 20.32. Since they are all odd, 2 is not a divisor, Therefore, division by 3, 7, 11, 13, and 19 are the only tests.
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