Turkish Journal of Mathematics, vol.46, no.Special Issue 2, pp.1845-1863, 2022 (SCI-Expanded)
The main objective of this paper is to calculate the forgotten topological index of the zero-divisor graph of Zn. Let p, q and r be distinct prime numbers. We calculate the forgotten topological index of the ring Γ(Zn) where n = pα, pq, p2q, p2q2, pqr. Also, we study the forgotten topological index of the product of rings of integers modulo n. We construct a polynomial algorithm to compute the forgotten topological index of Γ(Zn).