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N3

Part of 2015 Costa Rica - Final Round

Problems(1)

ab-1 | a^2 + 1 OLCOMA Costa Rica 2015 SL N3 day2

Source:

9/30/2021
Find all the pairs a,b∈Na,b \in N such that ab−1∣a2+1ab-1 |a^2 + 1.
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