Original Research Article

Article volume = 2023 and issue = 1

Pages: 90–95

Article publication Date: July 30, 2023

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A Note on the Harmonic and Gutman Index of Coprime Graph of the Group of Integers Modulo Prime Power

John Rafael M. Antalan

Department of Mathematics and Physics, College of Science, Central Luzon State University (3120), Science City of Munoz, Nueva Ecija, Philippines.


In a recent paper by M.N. Husni and his colleagues, they were able to determine the harmonic and Gutman index of the coprime graph of the group of integers modulo prime power. In this research note, we give a short proof of their results using some well-known results on the harmonic and Gutman index of a graph. Moreover, we give a general version of their result using a well-known result on group isomorphism in group theory.


Harmonic index, Gutman Index, Coprime Graph, Group of integers modulo n.

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Cite this article as:
  • John Rafael M. Antalan, A Note on the Harmonic and Gutman Index of Coprime Graph of the Group of Integers Modulo Prime Power, Communications in Combinatorics, Cryptography & Computer Science, 2023(1), PP.90–95, 2023
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