An interpretation of the stream

Give an interpretation of the stream computed by the following procedure:

(define (expand num den radix)
   (quotient (* num radix) den)
   (expand (remainder (* num radix) den) den radix)))

( quotient is a primitive that returns the integer quotient of two integers.) What are the successive elements produced by (expand 1 7 10) ? What is produced by (expand 3 8 10) ?

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