Public Sums() As Variant
Public Function Getsum(ByVal byt As Byte) As String

Sums() = Array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, _
                16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, _
                29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, _
                42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, _
                55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, _
                68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, _
                81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, _
                94, 95, 96, 97, 98, 99, 100)

Dim i As Integer, Sum As Long, strBuf As String

For i = 0 To byt
Sum = Sum + Sums(i)
Next i

For i = 0 To byt
strBuf = strBuf & Sums(i) & "+"
Next i

Debug.Print Mid(strBuf, 1, Len(strBuf) - 1) & " = " & Sum
Getsum = Mid(strBuf, 1, Len(strBuf) - 1) & " = " & Sum

End Function