Do the following numbers mean anything to anyone. A clue would be helpful. 4747, 784, 224, 16

16:56 Sun 24th Jan 2010
 
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They are from the GB Quiz 188.
The question is:- What number ends this sequence: 4747 784 224 16 ? 23
Sorry. The 23 is not supposed to be there. That's the number of the next question.
Question is:- What number ends this sequence: 4747 784 224 16 ?
:-) I did wonder about the bounce.

It looks to be a power sequence of some sort, but I can't spot it for the moment. Certainly they are either squares or almost squares which might be some sort of clue.
4 x 7 x 4 x 7 = 784 7 x 8 x 4 = 224 2 x 2 x 4 = 16 1 x 6 = 6

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