Type in a whole number value for i (which can be negative for Fibonacci or Lucas) in the From i= box.
If you want to find all the values in a certain range, type a value in the To i= box also.
Leave this blank if you just want a single value of a series.
Select the precision of the computation: Exact or Approximate.
(Ignored for Rabbit(i) and Initial digits.)
the calculator will find Fibonacci(i), Lucas(i) for i into the thousands.
This may take up to a minute or more depending on your computer.
Also, if i is too large, the browser may quit unexpectedly! Sorry - I cannot
predict or prevent this! 'i' values up to i=2000 should be OK and Fib(2000) has more than 400 digits.
Immediate result. The length of the answer decreases as i gets larger,
but the index i itself may have up to
Select an action:
outputs the Fib or Lucas series for i in the range.
Benford's Law relates to the distribution of the initial digits of
Fibonacci and Lucas numbers. (The precision buttons are irrelevant.)
Generates a correct, random expression involving two nth-roots
whose sum is 1, as mentioned on The Lucas numbers page.
clears all values and the output area.
and Internet Explorer 4 or Netscape Navigator 4 or Communicator 4 or later versions.