*Department of Mathematics, Shrimati Indira Gandhi College, Tiruchirapalli
**Department of Mathematics, National College, Tiruchirapalli
***Department of Mathematics, Cauvery College for Women, Tiruchirapalli
Online published on 12 November, 2013.
We obtain the ranks of m-gonal numbers such that the difference between any two m-gonal numbers is unity. The recurrence relations satisfied by the ranks of each m-gonal numbers are also presented.