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Source: Sent to me by Sudeep Kamath via  http://puzzletweeter.com/2013/06/21/884/ Problem:  Find a nine digit number abcdefghi that uses all the digits 1,2,3,...9 exactly once and satisfies: a is divisible by 1 ab (2 digit number with digits a and b) is divisible by 2 abc (3 digit number with digits a, b and c) is divisible by 3 ....... ....... abcdefghi is divisible by 9. Update (29/06/2013): Solution: Posted by JDGM, Anti, Meghana Kolan, Shwetabh Sameer and Unknown in comments! A more detailed solution provided by me in comments!