I find it really inspiring how long you've been working on this k. I started sieving for Proth k=1281979 some months back, now I'm at around 250T as well, but only for n < 4.1M. So 2 cores produce a factor aprroximately every 2000 s between them. Primality testing will be done using Proth20 on an older GTX7xx GPU, which takes 3.5 h for a = 4M so I'll continue sieving for a while.
If I will do this with the same dilligence as you, I'll still be at this k it in 2035... :)
Last fiddled with by bur on 20201216 at 09:09
