MATHWORLD: "Erdos offered a prize for a proof of the proposition that 'If the sum of reciprocals of a set of integers diverges, then that set contains arbitrarily long arithmetic progressions.' This conjecture is still open (unsolved), even for(adsbygoogle = window.adsbygoogle || []).push({}); 3-term arithmetic progressions. "

What's an n-term arithmetic progression?

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# Arithmetic Progression

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