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In this note, we find all the solutions of the Diophantine equation x 2 + 2a · 3b · 11c = y n, in nonnegative integers a, b, c, x, y, n ≥ 3 with x and y coprime.

In this paper, all the solutions of the Diophantine equations x2 + 5a?pb = yn (for p = 29,41) are given for nonnegative integers a,b,x,y,n ? 3 with x and y coprime.

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Apart from its applications in Chemistry, Biology, Physics, Social Sciences, Anthropology, etc., there are close relations between graph theory and other areas of Mathematics. Fibonacci numbers are of utmost interest due to their relation with the golden ratio and also due to many applications in different areas from Biology, Architecture, Anatomy to Finance. In this paper, we define Fibonacci graphs as graphs having degree sequence consisting of n consecutive Fibonacci numbers and use the invariant Ω to obtain some more information on these graphs. We give the necessary and sufficient conditions for the realizability of a set D of n successive Fibonacci numbers for every n and also list all possible realizations called Fibonacci graphs for 1≤n≤4.