Given the arithmetic sequence an = 3 + 2n, what is the domain for n?

The domain for n in the arithmetic sequence an = 3 + 2n is all real numbers. This is because there are no restrictions on the values that n can take in arithmetic sequences. You can substitute any real number for n, and the sequence will produce a valid term. The sequence generates numbers that increase by 2 for each successive term, starting from 3 when n = 0. Thus, n can take any real value: positive, negative, or zero.