=SIERREUR(INDEX(A$2:A$71;EQUIV(GRANDE.VALEUR(SI(EQUIV(A$2:A$71;A$2:A$71;0)=LIGNE(INDIRECT("1:"&LIGNES(A$2:A$71)));NB.SI(A$2:A$71;A$2:A$71));LIGNES($2:2));SI(EQUIV(A$2:A$71;A$2:A$71;0)=LIGNE(INDIRECT("1:"&LIGNES(A$2:A$71)));NB.SI(A$2:A$71;A$2:A$71));0));"")