More silly Vim tips! In order to make your search case-insensitive use the \c modifier. In order to have vim display line numbers use :set nu. And speaking of the :set options, you can use :set nu! (with a trailing question-mark) to toggle the option between on and off, :set nu? to query its status, and :set nonu (with a leading "no") to set it off.

Happy vimming!