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77040.

It goes like,

107 * 2 = 214

214 * 3 = 642

642 * 4 = 2568,

and so on.

x * a(+1) = (a new)x

Except that the word "completes" would suggest that there are no more terms. Not true!

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13y ago
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Q: What number best completes this sequence 107 214 642 2568 12840?
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