Which expression describes the nth term of the sequence of odd numbers that are greater than or equal to 3

The odd numbers can be given by:

2n - 1 Assuming n is starting at 1.

3 is the second odd number

2 (2) - 1 = 4 - 1 = 3

If we wish to start at at 3 then we only need to add 1 to the n:

2 (n+1) - 1 = 2n + 1.

And hence our expression.