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Nov 9, 2017 at 1:08 comment added fedja OK, I will post it later today then :-).
Nov 8, 2017 at 22:12 comment added user44143 @fedja, I’d be happy to see the path that you find obvious!
Nov 8, 2017 at 22:07 comment added fedja That's way too long: as I said, we have an obvious bound $C\sqrt a$ for large $a$ and your estimate is linear in $a$.
Nov 8, 2017 at 21:49 history answered user44143 CC BY-SA 3.0