class Demo_16 {
public static void main(String[] args) {
for(int i = 2;i<1000;i++){
for(int j = 2;j<=(int)Math.sqrt(i);j++){
if(i%j ==0){
break;
}else if(j==(int)Math.sqrt(i)){
System.out.println(i);
}
}
}
}
}
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