2005 Canadian MO Problems/Problem 5
Problem
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.
Solution
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Partial Solution:
Consider . Let .
According to Newton’s Sum:
. So clearly if then . This proves (b).
See also
2005 Canadian MO (Problems) | ||
Preceded by Problem 4 |
1 • 2 • 3 • 4 • 5 | Followed by Last Question |