The 13th number in the Fibonacci sequence is 233.
To understand how we arrive at this number, let’s take a quick look at the Fibonacci sequence itself. The sequence starts with 0 and 1, and each subsequent number is the sum of the two preceding ones. Here are the first several numbers in the sequence:
- 0
- 1
- 1 (0 + 1)
- 2 (1 + 1)
- 3 (1 + 2)
- 5 (2 + 3)
- 8 (3 + 5)
- 13 (5 + 8)
- 21 (8 + 13)
- 34 (13 + 21)
- 55 (21 + 34)
- 89 (34 + 55)
- 144 (55 + 89)
- 233 (89 + 144)
As you can see, by continuing to add the two preceding numbers in the sequence, we eventually find that the 13th number is 233.