The colors of 16 through 98 are unrelated to any of your 0 to 15 color values, as the values of 0 to 15 are meant to be changed while 16 to 98 are static.
You say that 1 is black, but for a lot of people 1 is a dark gray, or 0 may be black. Some people change all 0 to 15 colors to white and black... so duplicates are only what you make of them.
You can change these colors by right-clicking on the color pallet in the Alt-K 'Colors' window.
