Dan Abramov claims Lean-checked proof for Conway's 50-year-old numbers puzzle

Dan Abramov says he believes he has proved John Conway's 50-year-old refinement conjecture about omnific integers, a special number class. The proof was checked in Lean, software that verifies math step by step. He posted the claim Sept. 18, 2026 on his personal blog overreacted.io in 'How I Vibed a Proof of Conway's Conjecture.' It concerns how those numbers factor.