(By Jakob Lesage): "Are any numerals for multiples of 20 expressed using a base-20 system (e.g. 40 = 2x20; 60 = 3x20; 80 = 4x20; 120 = 6x20, etc.)? Or are numerals in between these multiples of 20 formed as 20+1, 20+2, .., 20+11, .., 20+19; 40+1, 40+2, .., 40+11, .., 40+19, etc.? Note that a source should mention numerals higher than 29 to be able to trigger a 1 for this feature."