1998 IMO Problems/Problem 6
Consider all functions f from the set N of all positive integers into itself sat- isfying f (t 2 f (s)) = s(f (t)) 2 for all s and t in N . Determine the least possible value of f (1998).
Consider all functions f from the set N of all positive integers into itself sat- isfying f (t 2 f (s)) = s(f (t)) 2 for all s and t in N . Determine the least possible value of f (1998).
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