A two-dimensional visualisation of the Hamming distance. The color of each pixel indicates the Hamming distance between the binary representations of its x and y coordinates, modulo 16, in the 16-color system.
Regular numbers are numbers that evenly divide powers of 60. Equivalently, they are the numbers whose only prime divisors are 2, 3, and 5. As an example, 602 = 3600 = 48 × 75, so as divisors of a powe
AO 6456, a table of reciprocals of regular numbers from Seleucid Uruk, copied from an unknown earlier source