Fibonacci number is N, iff 5N^2 - 4 OR 5N^2+4 is a perfect square.
Triangular number are of n(n+1) / 2
eg. 1,3,6,10,15....
Square number : N^2
Cube: N^3
Triangular number are of n(n+1) / 2
eg. 1,3,6,10,15....
Square number : N^2
Cube: N^3
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