The power graph P(G)=(V, E) of a finite group G={g1, g2 · gp} is the undirected graph with vertex set V=G and the edge set . Let 0 = λ1 ≤ λ2 ≤ ··· ≤ λp be the eigen values of the Laplacian matrix of P(G). Then its energy is defined by . This paper investigate various energies of P(Zpn), P(Q8) and P(D8).
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