09 Jul 2010 @ 11:57 AM 
0
1
1 5
7
11
13 13 21 23
27 35 37 37 ? 51 53 57 65 65

What is the missing number (if there is one) ?

Can you justify why?

EDIT: If you just gave up and want to peek at the answer check here . Puzzle was solved in Yahoo Answers! But the explanation to get to the result is missing.

Posted By: Eusebiu Blindu
Last Edit: 13 Jul 2010 @ 09:33 PM

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