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when toggle format what by license comment
Dec 18, 2016 at 15:34 comment added Geoff Robinson I think you mean that it fails when $n =2$ for $p \equiv 1$ (mod $4$) .
Dec 18, 2016 at 13:15 vote accept Adam P. Goucher
Dec 18, 2016 at 13:10 history answered Will Sawin CC BY-SA 3.0