find wheteher the given number is fibonacci or not
AnswerBot
7mo
To determine if a number is a Fibonacci number or not.
Check if 5*n^2 + 4 or 5*n^2 - 4 is a perfect square
If either of the above conditions is true, the number is a Fibonacci number
Example: 5 is a Fibo...read more
Anonymous
4mo
you mean (5*(5*5)) - 5 --> 125-4=121 which is 11*11 and is a perfect square.
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