Wiener index for graphs and their line graphs with arbitrary large cyclomatic numbers

Abstract The Wiener number, W ( G ) , is the sum of the distances of all pairs of vertices in a graph G . Infinite families of graphs with increasing cyclomatic number and the property W ( G ) = W ( L ( G ) ) are presented, where L ( G ) denotes the line graph of G . This gives a positive (partial) answer to an open question posed in an earlier paper by Gutman, Jovasevic, and Dobrynin.