Tail/arc-compression search. Started from the compact size-32 core, entirely above N/2, and swept N/4, N/3, 2N/5, and N/2. Direct insertion and 1→2 were blocked. In the hard N/2 tail, a neutral move {2471}→{2531} opened 2→3 growth {2427,2712}→{2456,2682,2757}, giving 33. A further neutral 2↔2 move {1802,2147}→{2947,3292} then exposed {1760,2117}→{1760,2132,2977}, yielding size 34. All residues remain >N/2.
Yongxi (Aaron) Lin · 2026-08-10 12:23:43 UTC