' Generates 5 x 5 Magic Squares of Squares

' Tested with Office 2007 under Windows 7

```Sub MgcSqr5a()

Dim a(25), b(2500), c(25), a1(96), b1(2500)

y = MsgBox("Locked", vbCritical, "Routine MgcSqr5a")
End

n2 = 0: n9 = 0: k1 = 1: k2 = 1

' Define Range and s2

Erase b1
m1 = 1: m2 = 31: s2 = 1375

For i1 = 1 To m2
a1(i1) = i1 ^ 2
b1(a1(i1)) = a1(i1)
Next i1

'   Generate data

t1 = Timer

For j25 = m1 To m2                                           'a(25)
If b(a1(j25)) = 0 Then b(a1(j25)) = a1(j25): c(25) = a1(j25) Else GoTo 250
a(25) = a1(j25)

For j19 = j25 + 1 To m2                                      'a(19)      Ess Diff
If b(a1(j19)) = 0 Then b(a1(j19)) = a1(j19): c(19) = a1(j19) Else GoTo 190
a(19) = a1(j19)

For j13 = m1 To m2                                           'a(13)
If b(a1(j13)) = 0 Then b(a1(j13)) = a1(j13): c(13) = a1(j13) Else GoTo 130
a(13) = a1(j13)

For j7 = j19 + 1 To m2                                       'a(7)       Ess Diff
If b(a1(j7)) = 0 Then b(a1(j7)) = a1(j7): c(7) = a1(j7) Else GoTo 70
a(7) = a1(j7)

a(1) = s2 - a(7) - a(13) - a(19) - a(25)
If a(1) < a1(m1) Or a(1) > a1(m2) Then GoTo 10
If a(1) < a(25) Then GoTo 10                                      '      Ess Diff
If b1(a(1)) = 0 Then GoTo 10
If b(a(1)) = 0 Then b(a(1)) = a(1): c(1) = a(1) Else GoTo 10

For j21 = j25 + 1 To m2                                      'a(21)      Ess Diff
If b(a1(j21)) = 0 Then b(a1(j21)) = a1(j21): c(21) = a1(j21) Else GoTo 210
a(21) = a1(j21)

For j17 = j25 + 1 To m2                                      'a(17)      Ess Diff
If b(a1(j17)) = 0 Then b(a1(j17)) = a1(j17): c(17) = a1(j17) Else GoTo 170
a(17) = a1(j17)

For j9 = j25 + 1 To m2                                       'a(9)       Ess Diff
If b(a1(j9)) = 0 Then b(a1(j9)) = a1(j9): c(9) = a1(j9) Else GoTo 90
a(9) = a1(j9)

a(5) = s2 - a(9) - a(13) - a(17) - a(21)
If a(5) < a1(m1) Or a(5) > a1(m2) Then GoTo 50
If a(5) < a(25) Then GoTo 50                                      '      Ess Diff
If a(21) > a(5) Then GoTo 50                                      '      Ess Diff
If b1(a(5)) = 0 Then GoTo 50
If b(a(5)) = 0 Then b(a(5)) = a(5): c(5) = a(5) Else GoTo 50

For j10 = m1 To m2                                           'a(10)
If b(a1(j10)) = 0 Then b(a1(j10)) = a1(j10): c(10) = a1(j10) Else GoTo 100
a(10) = a1(j10)

For j8 = m1 To m2                                            'a(8)
If b(a1(j8)) = 0 Then b(a1(j8)) = a1(j8): c(8) = a1(j8) Else GoTo 80
a(8) = a1(j8)

a(6) = s2 - a(7) - a(8) - a(9) - a(10)
If a(6) < a1(m1) Or a(6) > a1(m2) Then GoTo 60
If b1(a(6)) = 0 Then GoTo 60
If b(a(6)) = 0 Then b(a(6)) = a(6): c(6) = a(6) Else GoTo 60

For j11 = m1 To m2                                           'a(11)
If b(a1(j11)) = 0 Then b(a1(j11)) = a1(j11): c(11) = a1(j11) Else GoTo 110
a(11) = a1(j11)

a(16) = s2 - a(21) - a(11) - a(6) - a(1)
If a(16) < a1(m1) Or a(16) > a1(m2) Then GoTo 160
If b1(a(16)) = 0 Then GoTo 160
If b(a(16)) = 0 Then b(a(16)) = a(16): c(16) = a(16) Else GoTo 160

For j15 = m1 To m2                                           'a(15)
If b(a1(j15)) = 0 Then b(a1(j15)) = a1(j15): c(15) = a1(j15) Else GoTo 150
a(15) = a1(j15)

a(20) = s2 - a(25) - a(15) - a(10) - a(5)
If a(20) < a1(m1) Or a(20) > a1(m2) Then GoTo 200
If b1(a(20)) = 0 Then GoTo 200
If b(a(20)) = 0 Then b(a(20)) = a(20): c(20) = a(20) Else GoTo 200

a(18) = s2 - a(16) - a(17) - a(19) - a(20)
If a(18) < a1(m1) Or a(18) > a1(m2) Then GoTo 180
If b1(a(18)) = 0 Then GoTo 180
If b(a(18)) = 0 Then b(a(18)) = a(18): c(18) = a(18) Else GoTo 180

For j14 = m1 To m2                                           'a(14)
If b(a1(j14)) = 0 Then b(a1(j14)) = a1(j14): c(14) = a1(j14) Else GoTo 140
a(14) = a1(j14)

a(12) = s2 - a(11) - a(13) - a(14) - a(15)
If a(12) < a1(m1) Or a(12) > a1(m2) Then GoTo 120
If b1(a(12)) = 0 Then GoTo 120
If b(a(12)) = 0 Then b(a(12)) = a(12): c(12) = a(12) Else GoTo 120

For j3 = m1 To m2                                            'a(3)
If b(a1(j3)) = 0 Then b(a1(j3)) = a1(j3): c(3) = a1(j3) Else GoTo 30
a(3) = a1(j3)

a(23) = s2 - a(3) - a(8) - a(13) - a(18)
If a(23) < a1(m1) Or a(23) > a1(m2) Then GoTo 230
If b1(a(23)) = 0 Then GoTo 230
If b(a(23)) = 0 Then b(a(23)) = a(23): c(23) = a(23) Else GoTo 230

For j2 = m1 To m2                                            'a(2)
If b(a1(j2)) = 0 Then b(a1(j2)) = a1(j2): c(2) = a1(j2) Else GoTo 20
a(2) = a1(j2)

a(22) = s2 - a(2) - a(7) - a(12) - a(17)
If a(22) < a1(m1) Or a(22) > a1(m2) Then GoTo 220
If b1(a(22)) = 0 Then GoTo 220
If b(a(22)) = 0 Then b(a(22)) = a(22): c(22) = a(22) Else GoTo 220

a(4) = s2 - a(1) - a(2) - a(3) - a(5)
If a(4) < a1(m1) Or a(4) > a1(m2) Then GoTo 40
If b1(a(4)) = 0 Then GoTo 40
If b(a(4)) = 0 Then b(a(4)) = a(4): c(4) = a(4) Else GoTo 40

a(24) = s2 - a(21) - a(22) - a(23) - a(25)
If a(24) < a1(m1) Or a(24) > a1(m2) Then GoTo 240
If b1(a(24)) = 0 Then GoTo 240
If b(a(24)) = 0 Then b(a(24)) = a(24): c(24) = a(24) Else GoTo 240

'                          Exclude solutions with identical numbers (Back Check)

GoSub 800: If fl1 = 0 Then GoTo 5

n9 = n9 + 1: GoSub 650 'Print results (squares)
'                          n9 = n9 + 1: GoSub 640 'Print results (selected numbers)
End                    'Print only first square

5
b(c(24)) = 0: c(24) = 0
240 b(c(4)) = 0: c(4) = 0
40  b(c(22)) = 0: c(22) = 0
220 b(c(2)) = 0: c(2) = 0
20  Next j2

b(c(23)) = 0: c(23) = 0
230 b(c(3)) = 0: c(3) = 0
30  Next j3

b(c(12)) = 0: c(12) = 0
120 b(c(14)) = 0: c(14) = 0
140 Next j14

b(c(18)) = 0: c(18) = 0
180 b(c(20)) = 0: c(20) = 0
200 b(c(15)) = 0: c(15) = 0
150 Next j15

b(c(16)) = 0: c(16) = 0
160 b(c(11)) = 0: c(11) = 0
110 Next j11

b(c(6)) = 0: c(6) = 0
60  b(c(8)) = 0: c(8) = 0
80  Next j8
b(c(10)) = 0: c(10) = 0
100 Next j10

b(c(5)) = 0: c(5) = 0
50  b(c(9)) = 0: c(9) = 0
90  Next j9
b(c(17)) = 0: c(17) = 0
170 Next j17
b(c(21)) = 0: c(21) = 0
210 Next j21

b(c(1)) = 0: c(1) = 0
10  b(c(7)) = 0: c(7) = 0
70  Next j7
b(c(13)) = 0: c(13) = 0
130 Next j13
b(c(19)) = 0: c(19) = 0
190 Next j19
b(c(25)) = 0: c(25) = 0
250 Next j25

t2 = Timer

t10 = Str(t2 - t1) + " sec., " + Str(n9) + " Solutions for sum" + Str(s2)
y = MsgBox(t10, 0, "Routine MgcSqr5a")

End

'   Print results (selected numbers)

640 For i1 = 1 To 25
Cells(n9, i1).Value = a(i1)
Next i1

Return

'   Print results (squares)

650 n2 = n2 + 1
If n2 = 5 Then
n2 = 1: k1 = k1 + 6: k2 = 1
Else
If n9 > 1 Then k2 = k2 + 6
End If

Cells(k1, k2 + 1).Select
Cells(k1, k2 + 1).Font.Color = -4165632
Cells(k1, k2 + 1).Value = n9

i3 = 0
For i1 = 1 To 5
For i2 = 1 To 5
i3 = i3 + 1
Cells(k1 + i1, k2 + i2).Value = a(i3)
Next i2
Next i1

Return

'   Exclude solutions with identical numbers

800 fl1 = 1
For i1 = 1 To 25
a2 = a(i1)
For i2 = (1 + i1) To 25
If a2 = a(i2) Then fl1 = 0: GoTo 850
Next i2
Next i1
850 Return

End Sub
```