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Old 2020-09-26, 12:11   #8
Dr Sardonicus
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Feb 2017

22·5·7·31 Posts

FWIW, the odd quadratic residues (mod 2^n) are represented by the numbers congruent to 1 (mod 8) in [1, 2^n). This would appear to allow a counting of all quadratic residues similar to that for sums of four squares.
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