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Feb 28, 2017 at 21:09 vote accept Pavel Kozlov
Feb 28, 2017 at 14:20 comment added Jeremy Rouse Here's one more link. The paper by Shigeaki Tsuyumine here is about writing numbers as sums of three squares where congruences conditions are put on those squares. The main results of that paper imply that for sufficiently large $m$, there is a representation of $5m+6$ as $(5a+1)^2 + (5b+1)^2 + (5c+2)^2$.
Feb 28, 2017 at 5:53 comment added Pavel Kozlov Jeremy, big thanks for your useful links! As for my example, completing the square does not work, because we have equation $5m+6=(5a+1)^2+(5b+1)^2+(5c+2)^2$, and elementary means do not clarify situation in that case, in contrary to, for example, the representation as sum of three triangular numbers.
Feb 28, 2017 at 1:35 history answered Jeremy Rouse CC BY-SA 3.0