Assalamu Alaikum Good Logic,
I agree with Truth Seeker--Wanderer is confused enough as it is, and he/she doesn't need to be confused further by your alleged mathematical miracle. I think it's in everyone's best interests to leave the "19 code" out of this and instead focus on the Hafs and Warsh transmissions. This is just a kind request
To Wanderer: As Brother Joseph stated in this article, the Quran says that it was revealed and written down with "witnesses" and "honorable scribes." The need for witnesses seems to suggest that the transmission of the Quran which the majority follow, is the right one.
So according to the Quran itself, the Hafs transmission has been pretty much perfectly preserved. All Hafs transmissions are consistent with themselves (there are no differences between copies of the Hafs Quran). So this is the one which, according to the Quran, is preserved and guarded from corruption.
The Warsh version isn't corrupted either--it's just a slightly different reading.
As to your question about
why the Hafs Quran is the correct one: The Quran seems to suggest that Hafs is correct, since it's the majority transmission. So if the Quran is to be believed, then the Hafs version is free from errors and is the same one as the recitation revealed to the Prophet. We believe in the Hafs transmission since the Quranic evidence indicates it to be the more accurate one.
I hope this wasn't too confusing