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Fibonacci Fractions (Posted on 2005-03-09) Difficulty: 3 of 5
What is the sum of 0.1+ 0.01+ 0.002+ 0.0003+ 0.00005+ 0.000008+ ..., where each term is the n-th Fibonacci number, shifted n places to the right (that is, divided by 10^n)?

See The Solution Submitted by e.g.    
Rating: 3.0000 (2 votes)

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re: What I found | Comment 13 of 17 |
(In reply to What I found by Hugo)

Given this sequence sums to 10/89ths.  9*10/89=  1+ 1/89 <-- a power of ten off plus 1.  99*10/89 = 990/89 or 11 and 11/89ths.  The decimal portion of which is 10/89 +  1/89th.  What I assume is confusing people is why the two numbers look so alike.  Answer is that it is the fibonacci sequence.  0 1 1 2 3 5
                                              +   0 1 1 2 3

                                             = 0 1 2 3 5 8

The method it builds is part of the genious behind the sequience.

-Douglas

  Posted by Douglas on 2005-03-31 08:00:52

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