Bad Ugly Numbers (Codeforces 1326A)
Tags: Others, number theory

You are given a integer $$$n$$$ ($$$n > 0$$$). Find any integer $$$s$$$ which satisfies these conditions, or report that there are no such numbers:In the decimal representation of $$$s$$$:   $$$s > 0$$$,  $$$s$$$ consists of $$$n$$$ digits,  no digit in $$$s$$$ equals $$$0$$$,  $$$s$$$ is not divisible by any of it's digits. 

Input: The input consists of multiple test cases. The first line of the input contains a single integer $$$t$$$ ($$$1 \leq t \leq 400$$$), the number of test cases. The next $$$t$$$ lines each describe a test case.Each test case contains one positive integer $$$n$$$ ($$$1 \leq n \leq 10^5$$$).It is guaranteed that the sum of $$$n$$$ for all test cases does not exceed $$$10^5$$$.

Output: For each test case, print an integer $$$s$$$ which satisfies the conditions described above, or "-1" (without quotes), if no such number exists. If there are multiple possible solutions for $$$s$$$, print any solution.

Note: In the first test case, there are no possible solutions for $$$s$$$ consisting of one digit, because any such solution is divisible by itself.For the second test case, the possible solutions are: $$$23$$$, $$$27$$$, $$$29$$$, $$$34$$$, $$$37$$$, $$$38$$$, $$$43$$$, $$$46$$$, $$$47$$$, $$$49$$$, $$$53$$$, $$$54$$$, $$$56$$$, $$$57$$$, $$$58$$$, $$$59$$$, $$$67$$$, $$$68$$$, $$$69$$$, $$$73$$$, $$$74$$$, $$$76$$$, $$$78$$$, $$$79$$$, $$$83$$$, $$$86$$$, $$$87$$$, $$$89$$$, $$$94$$$, $$$97$$$, and $$$98$$$.For the third test case, one possible solution is $$$239$$$ because $$$239$$$ is not divisible by $$$2$$$, $$$3$$$ or $$$9$$$ and has three digits (none of which equals zero).

Sample Inputs:
4
1
2
3
4

Sample Outputs:
-1
57
239
6789

Solution (Python):
for i in range(int(input())):
    n = int(input())
    if n == 1:
        print(-1)
    else:
        s = '7' * n
        print('2' + s[1:])

Solution (Python):
t = int(input().strip())
for i in range(t):
    n = int(input().strip())
    if n == 1:
        print(-1)
    else:
        print('2' + '3' * (n - 1))

Solution (Python):
for g in [*open(0)][1:]:
    g = int(g) - 1
    print(('9' * g + '4', -1)[g == 0])