#include <bits/stdc++.h>
using namespace std;
inline int read()//读入优化
{
    int x = 0, f = 1;
    char ch = getchar();
    while (!isdigit(ch))
    {
        f = ch != '-';
        ch = getchar();
    }
    while (isdigit(ch))
    {
        x = (x << 1) + (x << 3) + (ch ^ 48);
        ch = getchar();
    }
    return f ? x : -x;
}
inline void write(int x)//输出优化
{
    if (x >= 10)
        write(x / 10);
    putchar(x % 10 + 48);
}
const int N = 1e7 + 100;
int T, x, ls;
int f[N], nx[N];
bool check(int x)//判断是否含有数字7
{
    while (x)
    {
        if (x % 10 == 7)
            return 1;
        x /= 10;
    }
    return 0;
}
void init()//预处理部分
{
    for (int i = 1; i <= N - 10; i++)
    {
        if (f[i])//如果被标记过，就跳过
            continue;
        if (check(i))//如果含有数字7，标记其倍数
        {
            for (int j = i; j <= N - 10; j += i)
                f[j] = 1;
            continue;
        }
        nx[ls] = i;//记录i
        ls = i;//更新ls
    }
}
int main()
{
    init();//先预处理
    T = read();
    while (T--)
    {
        x = read();
        if (f[x])//被标记了输出-1，否则输出nx
            puts("-1");
        else
            write(nx[x]), putchar('\n');
    }
    return 0;
}