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(define (prime? n)
(null? (filter (lambda (x) (= (remainder n x) 0))
(range 2 (- n 1)))))
(define (range from to)
(if (> from to)
'()
(cons from (range (+ from 1) to))))
(define (filter predicate data)
(cond ((null? data) '())
((predicate (car data))
(cons (car data) (filter predicate (cdr data))))
(else (filter predicate (cdr data)))))
;; try (filter prime? (range 2 100))
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