123456789987654321123456789987654321 % 13 = 6
0 + 1 % 13 = 1
10 + 2 % 13 = 12
120 + 3 % 13 = 6
60 + 4 % 13 = 12
120 + 5 % 13 = 8
80 + 6 % 13 = 8
80 + 7 % 13 = 9
90 + 8 % 13 = 7
70 + 9 % 13 = 1
10 + 9 % 13 = 6
60 + 8 % 13 = 3
30 + 7 % 13 = 11
110 + 6 % 13 = 12
120 + 5 % 13 = 8
80 + 4 % 13 = 6
60 + 3 % 13 = 11
110 + 2 % 13 = 8
80 + 1 % 13 = 3
30 + 1 % 13 = 5
50 + 2 % 13 = 0
0 + 3 % 13 = 3
30 + 4 % 13 = 8
80 + 5 % 13 = 7
70 + 6 % 13 = 11
10 + 7 % 13 = 0
0 + 8 % 13 = 8
80 + 9 % 13 = 11
110 + 9 % 13 = 2
20 + 8 % 13 = 2
20 + 7 % 13 = 1
10 + 6 % 13 = 3
30 + 5 % 13 = 9
90 + 4 % 13 = 3
30 + 3 % 13 = 7
70 + 2 % 13 = 7
70 + 1 % 13 = 6
6