IMO Shortlist 1981 problem 7


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2. travnja 2012.
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The function f(x,y) satisfies: f(0,y)=y+1, f(x+1,0) = f(x,1), f(x+1,y+1)=f(x,f(x+1,y)) for all non-negative integers x,y. Find f(4,1981).
Izvor: Međunarodna matematička olimpijada, shortlist 1981