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January 30, 2015

January 30, 2015

Posted by **Nikki** on Saturday, November 10, 2007 at 10:59pm.

407

409

411

413

- Math ? -
**Writeacher**, Saturday, November 10, 2007 at 11:03pmhttp://en.wikipedia.org/wiki/Prime_number

So ... which of these can be**divided**__evenly only by itself and 1____?__

??

- Math ? -
**tchrwill**, Sunday, November 11, 2007 at 8:42amWhich 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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