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The law of a string of numbers 1 12358 in da Vinci's code.
This is Fibonacci series, also called golden section series. Take the sum of the first two numbers as the third number and arrange them in turn to form a series.

For example, the above sequence: 1+ 1+2, 1+2=3, 2+3=5, 3+5=8. . . . .

It was first put forward by Italian mathematician Fibonacci in the book "The Book of Algorithms" 1 On Rabbit Reproduction.

Mathematically, Fibonacci series is defined recursively as follows: F0= 1, F 1= 1, fn = f (n-1)+f (n-2) (n >; =2,n∈N*)

/view/8 16.htm This is the encyclopedic link of Fibonacci sequence, which is introduced in detail.