*print-radix*

added
1.2

ns
clojure.pprint

type
var

Print a radix specifier in front of integers and rationals. If *print-base* is 2, 8, 
or 16, then the radix specifier used is #b, #o, or #x, respectively. Otherwise the 
radix specifier is in the form #XXr where XX is the decimal value of *print-base*