#include <stdio.h>
int prime[1000010]={1, 1, };
void Prime() {
for(int i=2; i<=1000; i++) {
if(prime[i]==0) {
for(int j=i*i; j<=1000000; j+=i) prime[j]=1;
}
}
}
int main() {
Prime();
int cnt=0;
for(int i=2; i<=1000000; i++) {
if(!prime[i]) {
printf("%6d ", i); cnt++;
if(cnt%15==0) puts("");
}
}
}
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