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OpenStudy (anonymous):
How do I check if a Number is Fibonacci or not?
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OpenStudy (anonymous):
http://en.wikipedia.org/wiki/Fibonacci_number#Recognizing_Fibonacci_numbers Well there's this...
OpenStudy (anonymous):
The standard way (other than generating up to \(N\)) is to check if \((5\times N^2 + 4)\) or \((5\times N^2- 4)\) is a perfect square.
OpenStudy (anonymous):
Errm... Sorry, FoolForMath. How do I prove it?
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