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Any number can be the next number. It is easy to find a rule based on a polynomial of order 4 such that the first four numbers are as listed in the question followed by the chosen next number. There are also non-polynomial solutions. Short of reading the mind of the person who posed the question, there is no way of determining which of the infinitely many solutions is the "correct" one.

The simplest solution, based on a polynomial of order 3, is

T(n) = (-19n^3 + 143n^2 - 331n + 246)/3 where n = 1, 2, 3, ...

and accordingly, the next number is 53.

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10y ago
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Q: What is the next number in the sequence 13 2 12 6?
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