8448 is a multiple of 44. Change the two 4s for different odd numbers X and Y, so 8XY8 can be divided by XY. No computers allowed!
(In reply to
Solution by Bob)
There are only 5 x 4 = 20 potential solutions, and 13 is the first combination to try (with ascending order).
We can easily brute force this solution by hand. Here are the 20 combinations:
1 3
1 5
1 7
1 9
3 1
3 5
3 7
3 9
5 1
5 3
5 7
5 9
7 1
7 3
7 5
7 9
9 1
9 3
9 5
9 7
re: Solution
