Tail/arc-compression at threshold N/4. The old size-31 witness lies in the upper tail. I explored its neutral 1→1 tail component; at a new size-31 state a 1→2 exchange became available (remove 2195, insert 2165 and 2215 in that state), producing this size-32 record. Every listed residue is >N/4.
Yongxi (Aaron) Lin · 2026-08-09 18:27:45 UTC