There is a logical pattern to the following series of numbers. What are the next three numbers in the series?

15 21 25 27 33 35 39 ...

Looking at the numbers, they all appear to share two properties: they are all odd, and none are prime. The numbers that are skipped (17, 19, 23, 29, 31, and 37) are all primes. By following this logic, the next three would be 45, 49, and 51.

Posted by Ender on 2003-02-10 09:19:23