123 ;; decimal all Emacs
#b101 ;; binary Emacs 21 up, XEmacs 21
#o77 ;; octal Emacs 21 up, XEmacs 21
#xFF ;; hex Emacs 21 up, XEmacs 21
#3r210 ;; any radix 2-36 Emacs 21 up (but not XEmacs 21.4)