Rest assured that the moderators are well aware of this user and his sockpuppets. 

I have now placed this question under <a href="http://meta.stackexchange.com/questions/52764/what-is-a-protected-question">protection</a> so that these entities cannot post further nonsense. The usual basins of attraction for this particular user involve RH, the Goldbach conjecture, the abc conjecture, and sometimes primality testing, and I have occasionally placed other questions which have these terms under protection as well. 

<b>Added 12/22/14:</b> May I *please* request that all discussion with this user (in comments below his nonsense posts) cease altogether? I cannot help but think that such comments only encourage him to post further. The most recent instance is someone who is gently pointing out the problems in his post in mathematical terms, but I am certain this will only reinforce a belief in him that it is worth his while to persist, since there are apparently some out there willing to engage with him seriously, despite the persecution visited on him by the evil mods. 

Please, just flag for deletion. Not only are the mods tracking these posts, some of the SE Community Managers are too, and spending quite some effort doing this and trying various things. This is a quite unusually determined individual. I think it would help us if no one engaged with him at all, ever.