求大佬看最后一个点RE

#include<iostream>
#include<cstdio>
#include<cstring>
const int maxn=10000000+10;
using namespace std;
int p[maxn],pri[maxn],prinum=0;
int main(){
    int n,m,a,sum=1;
    scanf("%d",&n);
    for(int i=1;i<=n;i++)sum*=10;
    for(int i=2;i<=sum;i++){
        if(p[i]==0)pri[++prinum]=i;
        for(int j=1;j<=prinum&&i*pri[j]<=sum;j++){
            p[i*pri[j]]=1;
            if(i%pri[j]==0)break;    
        }
    } 
    p[1]=1;p[0]=1;
    for(int i=sum/10;i<=sum-1;i++){
        int x=i,ans=0,y=n;
        while(y--){
            if(p[x])break;
            if(!p[x])x/=10;    
            if(y==0)cout<<i<<endl;
        }
}
    return 0;
}