It's adding the previous number to the current number, then continuing the pattern.
1 + 1 = 2
1 + 2 = 3
2 + 3 = 5
3 + 5 = 8
5 + 8 = 13
And so forth.
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-- Start with 0, 1 . -- Each term is then the sum of the two terms before it.
The 20th Fibonacci number in the sequence is 6,765.
The Fibonacci sequence requires two numbers as "seeds".
42
No, the Fibonacci sequence never ends. It just keeps on going!