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, 2016

Number theory Difficulty 3.0 AMC 10/12 Prove it United Kingdom

This year, 2016, can be written as the sum of two positive integers pp and qq where 2p=5q2p = 5q (as 2016=1440+5762016 = 1440 + 576). How many years between 2000 and 3000 inclusive have this property?

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