Résumé
Comptes Rendus de l Académie des Sciences - Series I - Mathematics 342 (2006) 533-538 Let$p$be a prime number and let$n$be a non-zero natural number. We compute the descending Loewy series of the algebra$R\_n/pR\_n$ , where$R\_n$denotes the ring of virtual ordinary characters of the symmetric group$S\_n$ .