There are a number of different commands you can use for switching to a
buffer by its number. For example, if you want to switch to the buffer
7, you can do
:e #7. However, there is a quicker way
than typing out either of those commands.
You may already be familiar with
CTRL-^ for switching to the alternate
file which is generally the previous buffer. If you precede that command
with a number, you will switch to the buffer with that number instead of the
From normal mode
will switch to buffer
:h Ctrl-^ for more details.