University of MaraghehSahand Communications in Mathematical Analysis2322-580701220141201On a sequence related to the coprime integers313711274ENMehdiHassaniDepartment of Mathematics, University of Zanjan University Blvd., 45371-38791, Zanjan.Journal Article20130220The asymptotic behaviour of the sequence with general term $P_n=(varphi(1)+varphi(2)+cdots+varphi(n))/(1+2+cdots+n)$, is studied which appears in the studying of coprime integers, and an explicit bound for the difference $P_n-6/pi^2$ is found.http://scma.maragheh.ac.ir/article_11274_868c353aa19d64f70c97af5928061b30.pdf