[R] binary representation of an integer?

[Mai Zhou]

Is there a function or other ways in R that can find the 
binary representation of an integer?
(or list all those representations for integers 0:63, for example)
OR do I have to built such a table?

i.e.   something like  binary(3)= 11
                       binary(4)= 100  etc.

Thanks.

Mai Zhou
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