A google doc about the methodology
From the packpng site FAQ:
Q: What is this about?
This is about finding the seed of the mysterious "pack.png" image that Minecraft uses. All of this started with a YouTube video made by SalC1.
Q: What is pack.png?
The image Minecraft used for the default texture pack in the texture pack selection screen, and also for greyed out if a server doesn't have a icon.
Q: How many seeds are there?
2^48*0.82 seeds.
230,809,480,902,738
230.8 Trillion
🆒