The next layer has 1, then the next has 2, then 3, then 5, then 8, then 13, and so on! As an example, the innermost layer of an artichoke has 1 bract (a specialized leaf-the part of the artichoke you eat). The sequence is found throughout the natural world. Introduced to the Western world by a medieval Italian mathematician named (you guessed it) Fibonacci in 1202, the number sequence appeared in Indian mathematics as early as 200 BC. Mathematicians’ fascination with the Fibonacci sequence goes way back. Can you figure out the next four terms in the Fibonacci sequence after 13? … which means that after the first two terms, each term in the Fibonacci sequence is found by adding the two previous terms together.
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