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.
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.
Saturday, January 14, 2017
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