Hi
user=> (def primes
> (cons 2
> (filter
> (fn isprime[n]
>
> (every?
> #(pos? (mod n %))
> (take-while #(<=(* % %)n) primes)))
> (iterate inc 3))))
> user=> (take 50 primes)
> (2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
> 101 103 107 109 113 127 131 137 139 149 151 157 163 167 173 179 181 191 193
> 197 199 211 223 227 229)
>
Is it really necessary to call 'take-while' ? The version without it
(def primes
(cons 2
(filter
(fn isprime? [n]
(every? #(pos? (mod n %)) primes))
(iterate inc 3))))
works for me as well. Is it safe to use this version or is using
'take-while' for some reason necessary ?
maclo
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