# How do you write an equation for the nth term of the geometric sequence #4, 8, 16, ...#?

##### 1 Answer

...but see below

#### Explanation:

It seems that currently the most common usage is that the initial value of a sequence is considered the "first" value.

That is for the given geometric sequence: 4, 8, 16, ...

Each term **after** the first increases the immediately prior term by a factor of

Less common these days (but the version I learned long ago) was to call the initial value of the sequence, the

That is for the given sequence: 4, 8, 16, ...

and the equation for the