AIMS Mathematics 2025, 10(2): 4355-4373
Published: 15 February 2025
Let be a graph and let be a distribution of pebbles on . A pebbling move on the graph consists of removing two pebbles from one vertex and then placing one pebble at an adjacent vertex. Given a positive integer , if we can move pebbles to any target vertex in only from the vertices in the set by pebbling moves, where is the distance between and , then such a graph pebbling played on is said to be distance -restricted. For each target vertex , we use to denote the maximum number of pebbles that can be moved to only from the vertices in the set . If for each , then we say that is -solvable. The optimal -pebbling number of , denoted by , is the minimum number of pebbles needed so that there is a -solvable distribution of . In this article, we study distance -restricted pebbling in cycles and show that for any -cycle with , for . It follows that if , then for and . Consequently, for , the problem of determining the exact value of for all can be reduced to the problem of determining the exact value of for . We also consider with . When , we have , since the diameter of is one. The exact value of is known. When , we determine the exact value of for .