Monday, 13 August 2012

Varaint of a 10 digit number

Consider a 10-digit number A written as a_1a_2...a_10. A contains each of the digits from 0 to 9 exactly once. The number a_1 is divisible by one. The number a_1a_2 is divisible by two. The number a_1a_2a_3 is divisible by three, and so on...What is A?