请在下列程序代码的基础上按照要求设计该程序, 完善程序中的划线部分。

Dim n As Integer, a1 As Integer, a2 As Integer, a3 As Integer

Function f(x) As Boolean

f = True

      For i = 2 To Sqr(x)

         If x Mod i = 0 Then      ①     

Next i

End Function

Private Sub Command1_Click()

n =      ②       

For a1 = 2 To n

 For a2 = a1 To n

  For a3 = a2 To n

   If     ③      And f(a1) And f(a2) And f(a3) Then

    List1.AddItem (Str(a1) + " " + Str(a2) + " " + Str(a3))

   End If

  Next a3

 Next a2

Next a1

End Sub

其中①处填入{#blank#}1{#/blank#}；②处填入{#blank#}2{#/blank#}；③处填入{#blank#}3{#/blank#}

Private Sub Command1_Click()

 Dim i As Integer, m As Integer, n As Integer

    Label1.Caption = "1000以内的完全数如下："

    For i = 1 To 1000

        n = 0

        For m = 1 To i \ 2

            If i Mod m = 0 Then n = n + m

        Next

        If n = i Then Label2.Caption = Label2.Caption & "" & Str(i)

    Next

End Sub

该过程采用的算法是（    ）

程序部分代码如下：

Private Sub Command1_Click()

Dim n, m, s, i, j, count As Long

Dim flag As Boolean

Dim a(1 To 100) As Integer

n = Val(Text1.Text)

count = 0

  ①  

For i = 0 to s-1

 m = i

 For j = 1 To n

 a(j) = m Mod 2

 m = m \ 2

Next j

flag = True

For j = 1 To n - 1

 If  ②  Then flag = false: exit For

Next j

If flag = True Then  ③  

Next i

Label1.Caption =“可行方案共”+ Str(count) + “种”

End Sub

登录模块

密码广泛应用于日常生活中，我们在登录网站、App、电子邮箱以及银行取款时都要输入“密码”。不少人因密码被盗而导致个人信息泄露，甚至是财产损失。

以下是王林同学设计的一款App的登录模块流程图。