Find a 10 digit number abcdefghij such that each digit is different,
and so that the number ab is divisible by 2, abc is divisible by 3,
abcd is divisible by 4, abcde is divisible by 5,
abcdef is divisible by 6, abcdefg is divisible by 7,
abcdefgh is divisible by 8, abcdefghi is divisible by 9,
and abcdefghij is divisible by 10.