2005 Canadian MO Problems/Problem 5
Let's say that an ordered triple of positive integers is -powerful if , , and is divisible by . For example, is 5-powerful.
- Determine all ordered triples (if any) which are -powerful for all .
- Determine all ordered triples (if any) which are 2004-powerful and 2005-powerful, but not 2007-powerful.
This problem needs a solution. If you have a solution for it, please help us out by.
Consider . Let .
According to Newton’s Sum:
. So clearly if then . This proves (b).
|2005 Canadian MO (Problems)|
|1 • 2 • 3 • 4 • 5||Followed by|