2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/62212An algorithm for computing /pi(N) is presented.It is shown that using a symmetry of natural numbers we can easily compute /pi(N).This method relies on the fact that counting the number of odd composites not exceeding N suffices to calculate /pi(N).7 pages,Slightly corrected versionGeneral Mathematicstext