Abstract
A sequence of natural numbersA=a 1,a 2, ... is constructed such that noa i −a j is a square and there are >x 0,73 a i 's belowx.
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References
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Ruzsa, I.Z. Difference sets without squares. Period Math Hung 15, 205–209 (1984). https://doi.org/10.1007/BF02454169
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DOI: https://doi.org/10.1007/BF02454169