Find the one 10-digit number which uses all 10 digits and has the following characteristics: The leftmost digit is divisible by 1, the leftmost two digits make a number divisible by 2, leftmost three digits form a number divisible by 3, etc. until the entire 10 digit number is divisible by 10.
A B C D E F G H I J
yadda yadda yadda
Because of divisibility rules, J must be 0 due to math being math.
Such is the same for 5, which means that E is 5.
This goes on for quite a bit and frankly it's very time consuming for me to type, and for you to read.
The answer to this annoying question is 3816547290