Posted by Sue on Monday, February 4, 2008 at 1:58pm.
Compare to the list of them here:
http://www.math-worksheets.info/Composite_numbers.html
The list goes as far as 100. Beyond that, 103 is prime and 105 has more than two prime factors (5,21,3,35,7, and 15), so they are not composite.
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