这是代码

#include<bits/stdc++.h>
using namespace std;
int judge(int i){
    int a[10],l=1,q=i;
    while(q/10){
        a[l]=q%10;
        q/=10;
        l++;
    }
    a[l]=q;
    int n;
    if(l%2==0) n=l/2;
    else n=(l-1)/2;
    int t=1;
    for(int j=1;j<=n;++j){
        if(a[j]!=a[l-j+1]){
            t=0;
            break; 
        }
    }
    if(t){
        int p=0;
        for(int j=2;j<=sqrt(i);++j){
            if(i%j==0) p++;
        }
        if(!p) return 1;
    }
    return 0;
}
int main(){
    int a,b;
    cin>>a>>b;
    for(int i=a;i<=b;++i){
        if(i%6==0){
            if(judge(i-1)) cout<<i-1<<endl;
            if(judge(i+1)) cout<<i+1<<endl;
        }
    }
}