A divisibility sequence is a sequence of numbers where each term is a factor of the next term. In other words, the ratio of any two consecutive terms in the sequence is a whole number.
The Fibonacci sequence is a sequence of numbers where each term is the sum of the two previous terms, starting with 0 and 1. The sequence is as follows: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, ...
To show that the Fibonacci sequence is a divisibility sequence, we must prove that the ratio of any two consecutive terms is a whole number. This can be done through mathematical induction, where we assume the ratio is a whole number for the first two terms and then show that it holds for any subsequent terms.
A clear example of the divisibility property in the Fibonacci sequence is the ratio of 8 and 5. 8 is the 6th term in the sequence and 5 is the 5th term. The ratio of these two terms is 8/5 = 1.6, which is a whole number (since the Fibonacci sequence only consists of integers).
Showing that the Fibonacci sequence is a divisibility sequence is important in understanding the properties and patterns of this well-known sequence. It also has applications in various fields such as mathematics, computer science, and biology. Additionally, it helps us to better understand the concept of divisibility and its role in number theory.