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.
Nov 23, 2014 - As the numbers get really big, each number is about 1.6 times the previous number. The sky's the limit: 10 dates: 1/1, 1/2, 1/12, 1/23, 2/3, 3/5, 5/8, 11/2, 11/23, and 12/3. By the way, in the year 2058 we'll get to have the awesome date 11/23/58!
Nov 23, 2017 - Mathematicians are celebrating November 23 because the date matches an important sequence of numbers. That's right: Happy Fibonacci Day everyone. Starting with the numbers zero and one, the sequence develops by adding the previous two numbers together to make the next in line.