Triangular graphs are proper lucky and lucky
T. V. Sateesh Kumar, S. Meenakshi · AIP conference proceedings · 2022
The labelling is lucky when the sum over adjacent nodes have different labeling. The proper labeling says that adjacent nodes have different labeling. We proved a proper lucky and lucky for specific type of snake graphs like triangular, double triangular, alternate triangular and double alternate triangular snake graph, also derived a proper lucky and lucky number.