Sub macro()
Dim calcul$, cell As Range, nombre
nombre = Sheets("Feuil1").Cells(3, "D").Value
With Sheets("Feuil2")
For Each cell In .Range(.Cells(1, "C"), .Cells(Rows.Count, "C").End(xlUp))
If cell = nombre Then
calcul = calcul & ";" & "E" & cell.Row
End If
Next cell
'destination
.[L1] = Mid(calcul, 2, 9 ^ 9)
End With
End Sub