Yes it is. It goes 1 1 2 3 5 8 13 21 34 55 89
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Leonardo Fibonacci discovered the number sequence which is named after him.
The Fibonacci sequence adds the 2 previous terms to find the next one. For instance: 1, 1, 2, 3, 5, 8, 13, 21, 34, 55... etc.
The 9th number in the Fibonacci Sequence is 34, and the 10th number in the Fibonacci sequence is 89.