#include <bits/stdc++.h>
using namespace std;
int n, m, maxAi;
int a[1123456];
int cnt[1123456];
int p[1123456];
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    cin >> n >> m;
    for (int i = 1; i <= n; i++)
    {
        cin >> a[i];
        if (a[i] <= m)
        {
            cnt[a[i]]++;
            maxAi = max(maxAi, a[i]);
        }
    }
    for (int i = 1; i <= maxAi; i++)
    {
        if (cnt[i] == 0)
            continue;
        for (int j = i; j <= m; j += i)
            p[j] += cnt[i];
    }
    int l = 1;
    for (int i = 2; i <= m; i++)
        if (p[i] > p[l])
            l = i;
    cout << l << " " << p[l] << "\n";
    for (int i = 1; i <= n; i++)
        if (l % a[i] == 0)
            cout << i << " ";
    return 0;
}