#include<cstdio>
using namespace std;
int n,m,q[100001],w[100001],wz,e[100001],ans=0;
inline int read(){
	int s=0;
	char ch=getchar();
	while(ch<'0'||ch>'9')ch=getchar();
	while(ch>='0'&&ch<='9')s=s*10+ch-'0',ch=getchar();
	return s;
}
int main(){
	n=read();
	m=read();
	for(int i=1;i<=n;i++){
		e[i]=read();
		if(e[i]<=m)q[e[i]]++;
	}
	for(int i=1;i<=m;i++){
		if(!q[i])continue;
		for(int j=i;j<=m;j+=i)w[j]+=q[i];
	}
	for(int i=1;i<=m;i++){
		if(ans<w[i])ans=w[i],wz=i;
	}
	if(ans==0){
		printf("1 0\n");
		return 0;
	}
	printf("%d %d\n",wz,ans);
	for(int i=1;i<=n;i++){
		if(wz%e[i]==0)printf("%d ",i);
	}
	return 0;
}