Strange Planet by Nathan W. Pyle

That would be the case for any base system. Do you know what a base system is? It's basically how many values before you go to the next place. So base 2, or binary, is 0 and 1. Counting goes 0, 1, 10, 11, 100, ... Base 16 is generally 0-F. Counting goes 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 1A, 1B, 1C, 1D, 1E, 1F, 20,...