For multiplication tables this is also true provided selected entries are multiplied instead of being added up. As a particular case, in multiplication tables determinants of any 2x2 square are 0. In addition tables, determinants of any 2x2 square equal -1. Determinants of order 3 or higher are all 0. The sum of 4 entries in any such square is a square number .
Multiplication tables conceal cubes and tetrahedral numbers .
As we see, number systems with different bases have many features in common. Some features are, of course, unique. Base 3 has been used in some early computers. In base 3, numbers are represented with digits 0,1, and 2. Number systems serve the purpose of representing numbers in different ways.