3 ms·

These shapes in the spiral are explored and explained a bit in the classic Tesla spiral hoax too. https://www.conquermaths.com/news/post/index/395/The-Mystery-

• Synaesthesia 5y ago
  Another fascinating video on the prime "arms" in the Ulam spiral. https://www.youtube.com/watch?v=EK32jo7i5LQ https://www.youtube.com/watch?v=EK32jo7i5LQ