If we count up from one, adding one each time, we progress through the first nine digits to the first double-digit number, which is ten. Ten is simply a one and a zero, or one and nothing. This starts the repeating cycle of the nine numbers over again. Eleven is one and one, or two. Twelve is one and two, or three.
Thirteen reduces to four.
Fourteen reduces to five, and so on. The cycle repeats in the order of one through nine to infinity. The sequence never changes, no matter how large or small the number, no matter how many digits the number has. This process is called base reduction , and will be one of the most important tools we will use. Some may already know of this process from the occult practice of numerology.