Fibonacci Reverse Calculation? Hi All!
I was reading Dr Knotts entries about Binets formula on his fibonacci page http://www.maths.surrey.ac.uk/hosted-sites/R.Knott/Fibonacci/fibFormula.html I entered the formula into an Excel spreadsheet to see how this would work ; Binet Formula Fib(n) = (1.6180339^n – (–0.6180339..)^n) / 2.236067977.. Its fascinating to see how I can enter any number for (n) and see the correct fibonacci number returned! I have a question though, I am a newbie computer programmer using VB and Python and my math skills are average at best but I am very interest and curious about math and especially fibonacci numbers! Say I wanted to reverse and change the process. I have a very large fibonacci number and I want to know what the fibonacci number is at a specified position BEFORE it, how would I compute this, what would the formula be? So for example I have the 301 st fibo number of ; 359579325206583560961765665172189099052367214309267232255589801 And I want to be able to find what the fibonacci value would be (n) numbers BEFORE this... so I might want to know what the fibo value would be 50 numbers before or the 251st fibo number. How would I do that? -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/779b27c9-8381-4f7e-8316-410fc5c2f988%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
