Abstract
A harmonious coloring of a simple graph is the proper vertex coloring such that each pair of colors appears together on at most one edge. The harmonious chromatic number of G, denoted by χh (G), is the least number of colors in a harmonious coloring of G. The paper gives the structural properties and the estimates of harmonious chromatic number of central graphs of Triangular snake graph C [Tn], Double triangular snake graph C [D (Tn)] and Diamond snake graph C [Dn].
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