recentf-open-most-recent-file
recentf-open-most-recent-file is an interactive compiled Lisp function in `recentf.el
'.
(recentf-open-most-recent-file &optional N)
Open the Nth most recent file.
Optional argument N must be a valid digit number. It defaults to 1.
1 opens the most recent file, 2 the second most recent one, etc..
0 opens the tenth most recent file.