ATON is a hopefully evolving classification theory. It aspires to unify knowledge around numbers and prefers naive methods. Some of the older posts are wrong but I'll keep them for the sake of continuity.
Ulam spiral on triangle on hexagonal grid transformed by 12 symmetries and added. Black is no primes, white is 8 primes. Note the many stars embedded in the hexagon.
Ulam spiral on triangle on hexagonal grid transformed through 12 symmetries and added, and a color scheme chosen to represent the number of primes. White is 9 primes, yellow 8, purple 7...
Ulam spiral on a triangle on hexagonal grid is transformed through 6 symmetries and added. Black is no primes, white is 5 primes. When the remaining 6 symmetries are added, the curl should disappear.
Saturday, January 14, 2017
Ulam spiral on triangle. I think this is the largest one on the net, with 7503 primes. It is interesting that the spiral brings out the symmetries of triangle, as it does in the square case.
