作者Zyca (swun mitru valy)
标题[转录]◇ IMO 竞赛第六题
时间Wed Jan 5 20:25:35 2000
Consider all functions f from the set N of all positive integers into
itself satisfying
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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