efficient algorithm to test whether a given number is part of the fibonnaci sequence

Posted by blueberryfields on Stack Overflow See other posts from Stack Overflow or by blueberryfields
Published on 2010-05-12T18:43:37Z Indexed on 2010/05/12 20:14 UTC
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algorithm

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fibonacci

Given the number X, is it a fibonnaci number?

Any source code or mathematical formula would be ok.

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