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It is: nth term = 7n-9
The nth term is 5n-3 and so the next term will be 22
The nth term is 2n2. (One way to find that is to notice at all the numbers are even, then divide them by 2. The sequence becomes 1, 4, 9, 16, 25, which are the square numbers in order.)
The nth term is 7n-5 and so the 6th term will be 37
2(n-1)