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Not sure about "completes" because the sequence continues.

The next number is 20 and you can verify that by fitting the following cubic equation:

u(n) = 5*(-n3 + 36n2 - 257n + 558)/12 for n = 1, 2, 3, 4, ...

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12y ago
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Q: What completes 140 75 35 17.5?
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