import java.util.TreeSet;
public class ThreesAndFivesSets {
private static final int LIMIT = 10_000_000; // = 10^7
public static void main(String[] args) {
final TreeSet<Integer> integers = new TreeSet<>();
for (int i = 3; i <= LIMIT; i+= 3) {
integers.add(i);
}
for (int i = 5; i <= LIMIT; i+= 5) {
integers.add(i);
}
System.out.println(integers);
}
}
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