2006 Cyprus MO/Lyceum/Problem 5
Problem
If both integers are bigger than 1 and satisfy , then the minimum value of is
A.
B.
C.
D.
E.
Solution
Since is greater than and therefore not equal to zero, we can divide both sides of the equation by to obtain , or Since is an integer, we must have is an integer. So, we can start testing out seventh powers of integers. doesn't work, since and are defined to be greater than . The next smallest thing we try is . This gives , so . Thus, our sum is .
See also
2006 Cyprus MO, Lyceum (Problems) | ||
Preceded by Problem 4 |
Followed by Problem 6 | |
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