Posted by **Sue** on Monday, February 4, 2008 at 1:58pm.

Wich if the given numbers are composite?15,19,23,31,49,55,59,87,91,97,103,105

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**drwls**, Monday, February 4, 2008 at 2:10pm
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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