It's all personal habits. Some people think that 13 antenna is the lifeline, and 13 is a number of Fibonacci series, and it is also a time-important digital window. The number 13 includes two or three trading days, usually in the short and medium term, so many people don't know if it can answer your doubts. Others use the magic average of 18.24 days for different reasons.

Fibonacci series refers to such a series: 0, 1, 1, 2, 3, 5, 8, 13, 2 1 ... This series starts from the third term, and each term is equal to the sum of the first two terms. The general formula is: (1/√ 5) * {[(1+√ 5)/2] n-[(1-√ 5)/2] n} (also called "ratio formula"), and irrational numbers are used to represent rational numbers. ) √5 means the root number 5.

It is very interesting that such a series of completely natural numbers are actually represented by irrational numbers.

For example, when the number of items in a series increases, the ratio of the previous item to the latter item is close to the golden section point of 0.6 180339887. ...

There is another attribute. Starting from the second item, the square of each odd item is less than the product of the first two items (please verify and determine by yourself) 1, and the square of each even item is greater than the product of the first two items (please verify and determine by yourself) 1. 》》》