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The next number in the sequence can be determined in infinitely many ways. One possible answer is the quartic polynomial,

Un = (5n4 - 60n3 + 246n2 - 403n + 248)/2 for n = 1 , 2, 3, ...

U6, the next term is 103.

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11y ago
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Q: Which is the next number in the series 18 13 19 6 4?
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