0
Anonymous
13
Use the quadratic: Un = 2n2 - 6n + 5 for n = 1, 2, 3, ...
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The next number is -21
36
21
31. The pattern is likely xn = xn-1 + n + 6.
This is the series of square numbers, (16= 4*4). The next number is 5*5=25.