Is 89 a Fibonacci Number?

89 is a Fibonacci Number if it is in the Fibonacci Sequence.

The Fibonacci Sequence starts with 1, 1, followed by the sum of the last two numbers in the sequence.

When we look at the Fibonacci Sequence, we see that the two Fibonacci Numbers before 89 are 34 and 55.

Since the sum of the last two numbers in the Sequence equals 89, we know that 89 is a Fibonacci Number.

Based on the information above, you can also calculate and conclude that the Fibonacci Number following 89 in the Fibonacci Sequence is 144, because 89 + 55 = 144.

Fibonacci Numbers
Look up another number to see if it is a Fibonacci Number.

Is 90 a Fibonacci Number?
Now you know if 89 is a Fibonacci Number or not. Go here to see if the next number on our list is a Fibonacci Number.