The Fibonacci series

is formed by starting with 0 and 1 and then adding the latest two numbers to get the next one:
 
  0 1 --the series starts like this.
  0+1=1 so the series is now 
  0 1 1
    1+1=2 so the series continues...
  0 1 1 2 and the next term is
      1+2=3 so we now have
  0 1 1 2 3  and it continues as follows ...
0,1,1,2,3,5,8,...

On these pages, the first Fibonacci number is 1, as is the second, the third being 2, the fourth 3 and so on. We will often include Fib(0)=0 too:

n:012345678910111213141516...
Fib(n):01123581321345589144233377610987..More..

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updated November 2003