Sunday, November 23, 2025

Fibonacci Day


 

November 23 is celebrated as Fibonacci Day because when the date is written in the mm/dd format (11/23), the digits in the date form a Fibonacci sequence: 1,1,2,3. A Fibonacci sequence is a series of numbers where a number is the sum of the two numbers before it. For example: 1, 1, 2, 3...is a Fibonacci sequence. Here, 2 is the sum of the two numbers before it (1+1). Similarly, 3 is the sum of the two numbers before it (1+2).

It is an annual holiday that honours one of the most influential mathematicians of the Middle Ages - Leonardo Bonacci.

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