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@ksaj @phoe
So there are only these special cases:
(format t "~b" #b10) = (format t "~2r" #b10)
(format t "~o" #o10) = (format t "~8r" #o10)
(format t "~x" #x10) = (format t "~16r" #x10)
If you want base 3, as we often do, we're stuck with just
(format t "~3r" 3)