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The Fibonacci series is an ordered list of numbers (the Fibonacci numbers) that begins with a 0, then a 1, then the next one, and so on. The Fibonacci series follows the principle that every integer is indeed the summation of the two numbers before it.

Beginning with the third, every integer follows the specified pattern. The seventh integer, for instance, is followed by the numbers 3 and 5, that sum up to 8.

The series may theoretically go on indefinitely, with every new integer utilizing the same algorithm. Certain references portray the Fibonacci sequence beginning with a one rather than a zero, however, this is exceptional.

Fibonacci sequence calculation

The Fibonacci series is theoretically calculable. Every integer in the series is treated as a term, symbolized by the symbol Fn. The n indicates the number’s place in the series, which begins at zero. The sixth term, for instance, is known as F5, whereas the 7th term is known as F6.

The Fibonacci series could be established utilizing this numbering usage of three main formulas:

  • F0 = 0 (this is applied only to the first number)
  • F1 = 1 (this is applied only to the second number)
  • Fn = Fn-1 + Fn-2 (and this can be applied to all the other numbers)

The very first two formulas simply state that the very first term is equal to 0 and the second-position term is equal to 1. The third formula is a looping expression, meaning that every integer in the series is determined by the integers before it. To determine the fifth integer (F4), for instance, the values F2 and F3 must first be specified. Those two components, in return, necessitate the interpretation of the numbers before them. All through the series, the integers continue to accumulate upon one another.

The Fibonacci integer for the tenth term (F9), for instance, can be found using the formula given:

  • F9 = F9-1 + F9-2 = F8 + F7 = 21 + 13 = 34

The difficulty with a recursive formula would be that to determine a particular integer in the series, one must at first understand the preceding Fibonacci integer. You would not be able to determine the value of the integer of the 100th term without first understanding the values of the 98th and 99th terms, that means you need to know all the terms preceding them. Alternative formulas, such as Binet’s formula, a closed-form formula for calculating the Fibonacci sequence of integers, can be utilized. Some other method is to put the reasoning of the recursive expression into software applications like Python, PHP, or Java and let the processors handle the rest.

The Fibonacci sequence has a long history

Leonardo Pisano (commonly known as Fibonacci), an Italian scholar who existed from 1170 to 1250, is indeed the originator of the Fibonacci series. The series, according to Fibonacci, is a solution to the given question:

“Have you ever wondered just how many rabbit pairs can be made annually, starting with a single pair, assuming every pairing carries a fresh pair each month, which will become successful from the 2nd month on?”

Well, the consequence would not differ and hence would reflect following the Fibonacci series.



Fibonacci integers could also be utilized to construct a spiral, and scientists and physicists seem to be interested in them since they are commonly found in numerous natural things and processes. The Fibonacci series can be seen in the branch structures of plants and their leaves, as well as the dispersion of seed in a raspberry. Henceforth, it is essential to have a good and clear understanding of the Fibonacci series.

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