There are several differing definitions of the sun graph. ISGCI defines a (complete) n-sun graph as a graph on 2n nodes (sometimes also known as a trampoline graph; Brandstädt et al. 1987, p. 112) consisting of a central complete graph K_n with an outer ring of n vertices, each of which is joined to both endpoints of the closest outer edge of the central core. Wallis and Anitha and Lekshmi use the term "n-sun" graph to instead refer to the graph on 2n vertices obtained by attaching n pendant edges to a cycle graph C_n. These graphs are referred to as "sunlet graphs" by ISGCI. The 3-sunlet graph C_3 ⊙K_1 is also known as the net graph. The sun graphs are pancyclic and uniquely Hamiltonian.
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