import static java.lang.Math.*;
import static java.util.Arrays.*;
import java.util.*;

public class B {
    Scanner sc = new Scanner(System.in);

    int N = 10000001;

    void run() {
        int caseN = sc.nextInt();
        int[] num = new int[N];
        for (int i = 2; i < N; i++) if (num[i] == 0) {
            num[i]++;
            for (int j = i * 2; j < N; j += i) {
                num[j]++;
            }
        }
        for (int caseID = 0; caseID < caseN; caseID++) {
            int a = sc.nextInt(), b = sc.nextInt(), n = sc.nextInt();
            int res = 0;
            for (int i = a; i <= b; i++) if (num[i] == n) res++;
            System.out.println(res);
        }
    }

    void debug(Object...os) {
        System.err.println(deepToString(os));
    }

    public static void main(String[] args) {
        new B().run();
    }
}