推荐回答（1个）
Public Function IsSushu(ByVal pa As Integer) As Boolean
Dim pb As Integer = pa - 1
Dim res As Boolean = True
For i = 2 To pb
If pa Mod i = 0 Then
res = False
Exit For
End If
Next i
Return res
End Function
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim pre As Integer
Dim str As String
str = ""
pre = 2
For i = 1 To 1000
If IsSushu(i) Then
If i - pre = 2 Then
str = str & i & " " & pre & vbCrLf
End If
pre = i
End If
Next
TextBox1.Text = str
End Sub
运行结果：
5 3
7 5
13 11
19 17
31 29
43 41
61 59
73 71
103 101
109 107
139 137
151 149
181 179
193 191
199 197
229 227
241 239
271 269
283 281
313 311
349 347
421 419
433 431
463 461
523 521
571 569
601 599
619 617
643 641
661 659
811 809
823 821
829 827
859 857
883 881
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