På svenska, tack! 

IMO 1997: Problem 5

 Find all pairs (a,b) of positive integers such that  a(b^2) = ba
 
 
 Find all pairs (a,b) of positive integers such that  ab = ba
 


© Copyright Bengt Månsson 1997, bengtmn@algonet.se.  Last updated November 18, 1997.