How to implement Erathostenes' sieve in O(sqrt(N)) thanks in advance.
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Where did you see, that it's possible? I now, that Erathostenes' sieve works in O(nloglog(n)). O(log(log(n))) was my mistake :D. (Sorry for my poor english :( )
may be O(n loglog n) ?
O(sqrt(n)), then O(log(log(n)))... Perfect!
It can be implemented in O(n) time, but not in O(sqrt(N)), it's fairy tale.