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The forgotten topological index or F-index of a graph is defined as the sumof cubes of the degree of all the vertices of the graph. In this paper we studythe F-index of four operations related to the lexicographic product on graphswhich were introduced by Sarala et al. [D. Sarala, H. Deng, S.K. Ayyaswamya andS. Balachandrana, The Zagreb indices of graphs based on four new operationsrelated to the lexicographic product, \textit{Applied Mathematics andComputation}, 309 (2017) 156--169.].

F-index of graphs based on four operations related to the lexicographic product