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There are many possible answers.
The simplest polynomial solution is
Un = (20n3 - 90n2 + 160n - 75)/3 for n = 1 , 2, 3, ... and accordingly, the next few terms are 325, 655, 1165, etc.
An alternative is a geometric sequence of the form
Vn = 5*3n-1 where n = 1, 2, 3, ...
so the next few terms will be 405, 1215, 3645, etc.
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