import java.io.*;
import java.util.ArrayList;
import java.util.StringTokenizer;

public class LcmSubsequenceJava implements Runnable {

    void solve() throws IOException {
        int n = readInt();
        int m = readInt();
        int max = (int) 1e6;

        int[] input = readIntArray(n);
        int[] count = new int[max + 1];
        for (int x : input) {
            if (x <= m) {
                count[x]++;
            }
        }

        int[] answer = new int[m + 1];
        for (int i = 1; i <= max; i++) {
            for (int j = i; j <= m; j += i) {
                answer[j] += count[i];
            }
        }
        int maxAnswer = 0;
        int lcm = 1;
        for (int i = 1; i <= m; i++) {
            if (answer[i] > maxAnswer) {
                maxAnswer = answer[i];
                lcm = i;
            }
        }
        ArrayList<Integer> result = new ArrayList<>();
        for (int i = 0; i < n; i++) {
            if (lcm % input[i] == 0) result.add(i + 1);
        }
        out.println(lcm + " " + result.size());
        for (int x : result) out.print(x + " ");
        out.println();
    }

    /*IO*/

    private BufferedReader in;
    private PrintWriter out;
    private StringTokenizer tok = new StringTokenizer("");

    void init() throws FileNotFoundException {
        in = new BufferedReader(new InputStreamReader(System.in));
        out = new PrintWriter(System.out);
    }

    String readString() throws IOException {
        while (!tok.hasMoreTokens()) {
            try {
                tok = new StringTokenizer(in.readLine());
            } catch (Exception e) {
                return null;
            }
        }
        return tok.nextToken();
    }

    int readInt() throws IOException {
        return Integer.parseInt(readString());
    }

    int[] readIntArray(int size) throws IOException {
        int[] res = new int[size];
        for (int i = 0; i < size; i++) {
            res[i] = readInt();
        }
        return res;
    }

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

    public void run() {
        try {
            init();
            solve();
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
            System.exit(-1);
        }
    }

}