Write a program or function to check if a number that is inputted is a Fibonacci number. A Fibonacci number is a number contained in the Fibonacci sequence.
The Fibonacci Sequence is defined as:
F(n) = F(n - 1) + F(n - 2)
With the seeds being
F(0) = 0 and
F(1) = 1.
A non-negative integer between 0 and 1,000,000,000 that may or may not be a Fibonacci number.
A truthy/falsy value indicating whether or not the input is a Fibonacci number.
0-->truthy 1-->truthy 2-->truthy 12-->falsy
This is code-golf, lowest byte count wins.