This sequence was discovered by the Italian mathematician Leonardo Fibonacci in the13rd century. A series of numbers in a sequence are usually called magic numbers and odd numbers.

The specific sequence is: 1, 1, 2, 3, 5, 8, 13, 2 1, 34, 55, 89, 144, 233, ...

Formula of series: A0 = a1=1; An=An- 1+An-2 (n=2，3，4，…)

Expressed in language, that is, starting from the third number of the series, each number is equal to the sum of the first two adjacent numbers.

There are many numerical phenomena related to Fibonacci sequence: two consecutive Fibonacci numbers have no common divisor; The sum of any number in the sequence 10 can be divisible by 1 1; ..... I won't go into details here.

No matter from macroscopic space to microscopic molecular atoms, from time to space, from nature to human society, politics, economy, military and so on, people can find traces of Fibonacci odd numbers. Fibonacci graphics frequently appear in the analysis of futures market and stock market. For example, in wave theory, a bull market can be represented by the rising wave of 1, or by five lower-level wavelets, and can be further subdivided into 2 1 or 89 wavelets; A bear market can be represented by the falling wave of 1, or by three lower-level wavelets, and can be further subdivided into 13 or 55 wavelets; A complete bull-bear market cycle can be represented by two waves, or eight waves at a lower level, and can be further subdivided into 34 or 144 wavelets. These numbers are Fibonacci series. When people talk about the callback and extension of the market, they often use numbers such as 0.6 18, 0.328, 0.236 and 1.6 18, 2.382 and 4.236. These figures can show the ratio of average to Fibonacci odd number, which is called Fibonacci blank. For example, the ratio of two adjacent Fibonacci odd numbers tends to be 0.6 18 or 1.6 18, and the ratio of two adjacent Fibonacci odd numbers tends to be 0.382 or 2.618 every other time. The ratio of two adjacent Fibonacci odd numbers tends to 0.236 or 4.236.