Dim Prime As Single Dim Flag As Integer

Sub GetFactors()

Dim Count As Integer
Dim NumToFactor As Single 'Integer limits to < 32768
Dim Factor As Single
Dim y As Single
Dim IntCheck As Single

Primes - distribution - up to 3 x 17 primorial, by Endlessoblivion on Wikimedia Commons

Count = 0
Do
NumToFactor = _
Application.InputBox(Prompt:="Type integer", Type:=1)
'Force entry of integers greater than 0.
IntCheck = NumToFactor - Int(NumToFactor)
If NumToFactor = 0 Then
Exit Sub
'Cancel is 0 -- allow Cancel.
ElseIf NumToFactor < 1 Then
MsgBox "Please enter an integer greater than zero."
ElseIf IntCheck > 0 Then
MsgBox "Please enter an integer -- no decimals."
End If
'Loop until entry of integer greater than 0.
Loop While NumToFactor 0
For y = 1 To NumToFactor
'Put message in status bar indicating the integer being checked.
Application.StatusBar = "Checking " & y
Factor = NumToFactor Mod y
'Determine if the result of division with Mod is without _
remainder and thus a "factor".
If Factor = 0 Then
'Enter the factor into a column starting with the active cell.
ActiveCell.Offset(Count, 0).Value = y
'Increase the amount to offset for next value.
Count = Count + 1
End If
Next
'Restore Status Bar.
Application.StatusBar = "Ready"
End Sub

Sub GetPrime()
Dim Count As Integer
Dim BegNum As Single 'Integer limits to < 32768
Dim EndNum As Single
Dim Prime As Single
Dim flag As Integer
Dim IntCheck As Single
Count = 0

Do
BegNum = _
Application.InputBox(Prompt:="Type beginning number.", Type:=1)
'Force entry of integers greater than 0.
IntCheck = BegNum - Int(BegNum)
If BegNum = 0 Then
Exit Sub
'Cancel is 0 -- allow Cancel.
ElseIf BegNum < 1 Then
MsgBox "Please enter an integer greater than zero."
ElseIf IntCheck > 0 Then
MsgBox "Please enter an integer -- no decimals."
End If
'Loop until entry of integer greater than 0.
Loop While BegNum 0

Do
EndNum = _
Application.InputBox(Prompt:="Type ending number.", Type:=1)
'Force entry of integers greater than 0.
IntCheck = EndNum - Int(EndNum)
If EndNum = 0 Then
Exit Sub
'Cancel is 0 -- allow Cancel.
ElseIf EndNum < BegNum Then
MsgBox "Please enter an integer larger than " & BegNum
ElseIf EndNum < 1 Then
MsgBox "Please enter an integer greater than zero."
ElseIf IntCheck > 0 Then
MsgBox "Please enter an integer -- no decimals."
End If
'Loop until entry of integer greater than 0.
Loop While EndNum < BegNum Or EndNum 0

For y = BegNum To EndNum
flag = 0
z = 1
Do Until flag = 1 Or z = y + 1
'Put message into Status Bar indicating the integer and _
divisor in each loop.
Application.StatusBar = y & " / " & z
Prime = y Mod z
If Prime = 0 And z y And z 1 Then
flag = 1
End If
z = z + 1
Loop

If flag = 0 Then
'Enter the factor into a column starting with the active cell.
ActiveCell.Offset(Count, 0).Value = y
'Increase the amount to offset for next value.
Count = Count + 1
End If
Next y
'Restore Status Bar.
Application.StatusBar = "Ready"
End Sub