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There are infinitely many rules that can generate the above sequence and it is always possible to find one which will give any number of your choice as the next.

One possible rule is

Un = (7n4 - 78n3 + 305n2 - 450n + 240)/12 for n = 1, 2, 3, ... and that gives the next number as 62.

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10y ago
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Anonymous

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3y ago

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Q: What number comes next in the following sequence 2 4 8 10 20?
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