Bonjour,
une solution possible par macro :
Sub MaMacro()
Dim T1, T2, TT, i As Long, j As Integer, DL As Long, Année As Integer
With Worksheets("Feuil1")
DL = .Range("B" & Rows.Count).End(xlUp).Row
T1 = .Range("B1:B" & DL)
T2 = .Range("C1:C" & DL)
ReDim TT(1 To DL)
For i = 1 To DL
TT(i) = T1(i, 1)
For j = T1(i, 1) + 1 To T2(i, 1)
TT(i) = TT(i) & ";" & j
Next
Next
.Range("E1").Resize(DL, 1) = Application.Transpose(TT)
End With
End Sub
A+