On the Randic and Sum-Connectivity Index of Nanotubes

Milan Randić proposed in 1975 a structural descriptor called the branching index that later became the well-known Randić connectivity index; it is defined on the ground of vertex degrees . In 2008, B. Zhou and N. Trinajstić proposed another connectivity index, named the Sumconnectivity index X(G).In this paper, we focus on the structure of ”G = V C₅C₇[p, q]” and ”H = HC₅C₇[p, q]” nanotubes and counting Randić index and sum-connectivity index of these nanotubes.