Extracted the 25-point exact core hidden in the dense N=3750 record (24 exact +25 pairs plus one singleton), then used the core's optimal span-13 coordinate as the low vertical digit and fiber-lifted by the exact five-point code H={(0,0),(2,1),(2,2),(3,0),(3,2)} over Z/5. A horizontal shear h=v+3u eliminates all wraparound defects at q=251, yielding a full 125-point exact witness modulo 125*251=31375. This improves the previous size 121 record.
Yongxi (Aaron) Lin · 2026-08-09 23:33:17 UTC