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May 13, 2017 at 23:17 vote accept T. Amdeberhan
May 13, 2017 at 23:14 comment added Gjergji Zaimi @T.Amdeberhan I fixed the typo, and added a lemma to explain (1) and (2).
May 13, 2017 at 23:12 history edited Gjergji Zaimi CC BY-SA 3.0
added 1062 characters in body
May 13, 2017 at 20:47 comment added T. Amdeberhan This is very cool. A few questions. Can you prove: (1) $\sigma(4n+1)$ is odd iff $4n+1$ is a perfect square, (2) the numbers $2y_i+1$ are exactly the numbers $n$ for which $\sigma(4n+1)\equiv 2\pmod{4}$? Also edit this: $2n+1=(2k-1)(2r+1)$.
May 13, 2017 at 14:32 history edited Gjergji Zaimi CC BY-SA 3.0
Fixed a typo
May 13, 2017 at 7:34 comment added Gjergji Zaimi Cute question, by the way. I would have never guessed that $Y(q)$ has such a simple infinite product expansion mod 2, had I not been looking for it.
May 13, 2017 at 7:25 history answered Gjergji Zaimi CC BY-SA 3.0