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anuj | 12:56 Fri 30th Jun 2006 | Quizzes & Puzzles
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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 ...
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45

sequence is 2 sequences as follows:

a a b a a b a

where sequence a is

3x5 3x7 3x9 3x11 3x13 .....

sequence b is

5x5 5x7 ...

so, the next in each sequence is 45
45 49 51
The sequence seems to consist of all the composite (ie non-prime) odd numbers.

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