Message boards : Science : base R281 (2k)
- n=100-300k, 2k left (38, 314) - runtime 5min35s-52min (AVX@3.8Ghz) 112*281^133589-1 found by CharityEngine2 272*281^162232-1 found by vaughan 112*281^218429-1 found by CharityEngine2 (TOP5000)