Write an expression for the apparent nth term (an) of the sequence. (Assume that n begins with

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Write an expression for the apparent nth term (an) of the sequence. (Assume that n begins with 1.)
1. 3, 7, 11, 15, 19, . . .
2. 0, 3, 8, 15, 24, . . .
3. 3, 10, 29, 66, 127, . . .
4. 91, 82, 73, 64, 55, . .
.
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