' Generates Concentric Magic Squares of order 7 for integers 1 thru 49

' Tested with Office 2007 under Windows 7

Sub MgcSqr7d()

Dim a(49), b(49), c(49)

y = MsgBox("Locked", vbCritical, "Routine MgcSqr7d")
End

n2 = 0: n9 = 0
m1 = 1: m2 = 49: s1 = 175

'   Generate data

t1 = Timer

a(25) = 25: b(25) = 25: c(25) = 25                            'Tested with

For j49 = 49 To 49                                            'a(49) = 49
If b(j49) = 0 Then b(j49) = j49: c(49) = j49 Else GoTo 490
a(49) = j49

a(1) = 50 - a(49)
If a(1) <= 0 Or a(1) > 49 Then GoTo 10
If b(a(1)) = 0 Then b(a(1)) = a(1): c(1) = a(1) Else GoTo 10

For j48 = 48 To 48                                            'a(48) = 48
If b(j48) = 0 Then b(j48) = j48: c(48) = j48 Else GoTo 480
a(48) = j48

a(6) = 50 - a(48)
If a(6) <= 0 Or a(6) > 49 Then GoTo 60
If b(a(6)) = 0 Then b(a(6)) = a(6): c(6) = a(6) Else GoTo 60

For j47 = 10 To 10                                            'a(47) = 10
If b(j47) = 0 Then b(j47) = j47: c(47) = j47 Else GoTo 470
a(47) = j47

a(5) = 50 - a(47)
If a(5) <= 0 Or a(5) > 49 Then GoTo 50
If b(a(5)) = 0 Then b(a(5)) = a(5): c(5) = a(5) Else GoTo 50

For j46 = 8 To 8                                              'a(46) =  8
If b(j46) = 0 Then b(j46) = j46: c(46) = j46 Else GoTo 460
a(46) = j46

a(4) = 50 - a(46)
If a(4) <= 0 Or a(4) > 49 Then GoTo 40
If b(a(4)) = 0 Then b(a(4)) = a(4): c(4) = a(4) Else GoTo 40

For j45 = 6 To 6                                              'a(45) =  6
If b(j45) = 0 Then b(j45) = j45: c(45) = j45 Else GoTo 450
a(45) = j45

a(3) = 50 - a(45)
If a(3) <= 0 Or a(3) > 49 Then GoTo 30
If b(a(3)) = 0 Then b(a(3)) = a(3): c(3) = a(3) Else GoTo 30

For j44 = 47 To 47                                            'a(44) = 47
If b(j44) = 0 Then b(j44) = j44: c(44) = j44 Else GoTo 440
a(44) = j44

a(43) = 175 - a(44) - a(45) - a(46) - a(47) - a(48) - a(49)
If a(43) <= 0 Or a(43) > 49 Then GoTo 430
If b(a(43)) = 0 Then b(a(43)) = a(43): c(43) = a(43) Else GoTo 430
a(7) = 50 - a(43)
If a(7) <= 0 Or a(7) > 49 Then GoTo 70
If b(a(7)) = 0 Then b(a(7)) = a(7): c(7) = a(7) Else GoTo 70
a(2) = 50 - a(44)
If a(2) <= 0 Or a(2) > 49 Then GoTo 20
If b(a(2)) = 0 Then b(a(2)) = a(2): c(2) = a(2) Else GoTo 20

For j42 = 5 To 5                                              'a(42) =  5
If b(j42) = 0 Then b(j42) = j42: c(42) = j42 Else GoTo 420
a(42) = j42

a(36) = 50 - a(42)
If a(36) <= 0 Or a(36) > 49 Then GoTo 360
If b(a(36)) = 0 Then b(a(36)) = a(36): c(36) = a(36) Else GoTo 360

For j41 = m1 To m2                                            'a(41) = 13
If b(j41) = 0 Then b(j41) = j41: c(41) = j41 Else GoTo 410
a(41) = j41

a(9) = 50 - a(41)
If a(9) <= 0 Or a(9) > 49 Then GoTo 90
If b(a(9)) = 0 Then b(a(9)) = a(9): c(9) = a(9) Else GoTo 90

For j40 = m1 To m2                                            'a(40) = 14
If b(j40) = 0 Then b(j40) = j40: c(40) = j40 Else GoTo 400
a(40) = j40

a(12) = 50 - a(40)
If a(12) <= 0 Or a(12) > 49 Then GoTo 120
If b(a(12)) = 0 Then b(a(12)) = a(12): c(12) = a(12) Else GoTo 120

For j39 = m1 To m2                                            'a(39) = 30
If b(j39) = 0 Then b(j39) = j39: c(39) = j39 Else GoTo 390
a(39) = j39

a(11) = 50 - a(39)
If a(11) <= 0 Or a(11) > 49 Then GoTo 110
If b(a(11)) = 0 Then b(a(11)) = a(11): c(11) = a(11) Else GoTo 110

For j38 = m1 To m2                                            'a(38) = 33
If b(j38) = 0 Then b(j38) = j38: c(38) = j38 Else GoTo 380
a(38) = j38

a(37) = 125 - a(38) - a(39) - a(40) - a(41)
If a(37) <= 0 Or a(37) > 49 Then GoTo 370
If b(a(37)) = 0 Then b(a(37)) = a(37): c(37) = a(37) Else GoTo 370
a(13) = 50 - a(37)
If a(13) <= 0 Or a(13) > 49 Then GoTo 130
If b(a(13)) = 0 Then b(a(13)) = a(13): c(13) = a(13) Else GoTo 130
a(10) = 50 - a(38)
If a(10) <= 0 Or a(10) > 49 Then GoTo 100
If b(a(10)) = 0 Then b(a(10)) = a(10): c(10) = a(10) Else GoTo 100

For j35 = 11 To 11                                            'a(35) = 11
If b(j35) = 0 Then b(j35) = j35: c(35) = j35 Else GoTo 350
a(35) = j35

a(29) = 50 - a(35)
If a(29) <= 0 Or a(29) > 49 Then GoTo 290
If b(a(29)) = 0 Then b(a(29)) = a(29): c(29) = a(29) Else GoTo 290

For j34 = m1 To m2                                            'a(34) = 31
If b(j34) = 0 Then b(j34) = j34: c(34) = j34 Else GoTo 340
a(34) = j34

a(30) = 50 - a(34)
If a(30) <= 0 Or a(30) > 49 Then GoTo 300
If b(a(30)) = 0 Then b(a(30)) = a(30): c(30) = a(30) Else GoTo 300

For j33 = 22 To 22                                            'a(33) = 22
If b(j33) = 0 Then b(j33) = j33: c(33) = j33 Else GoTo 330
a(33) = j33

a(17) = 50 - a(33)
If a(17) <= 0 Or a(17) > 49 Then GoTo 170
If b(a(17)) = 0 Then b(a(17)) = a(17): c(17) = a(17) Else GoTo 170

For j32 = 27 To 27                                            'a(32) = 27
If b(j32) = 0 Then b(j32) = j32: c(32) = j32 Else GoTo 320
a(32) = j32

a(31) = 75 - a(32) - a(33)
If a(31) <= 0 Or a(31) > 49 Then GoTo 310
If b(a(31)) = 0 Then b(a(31)) = a(31): c(31) = a(31) Else GoTo 310
a(26) = 100 - a(32) - 2 * a(33)
If a(26) <= 0 Or a(26) > 49 Then GoTo 260
If b(a(26)) = 0 Then b(a(26)) = a(26): c(26) = a(26) Else GoTo 260
a(24) = -50 + a(32) + 2 * a(33)
If a(24) <= 0 Or a(24) > 49 Then GoTo 240
If b(a(24)) = 0 Then b(a(24)) = a(24): c(24) = a(24) Else GoTo 240
a(19) = -25 + a(32) + a(33)
If a(19) <= 0 Or a(19) > 49 Then GoTo 190
If b(a(19)) = 0 Then b(a(19)) = a(19): c(19) = a(19) Else GoTo 190
a(18) = 50 - a(32)
If a(18) <= 0 Or a(18) > 49 Then GoTo 180
If b(a(18)) = 0 Then b(a(18)) = a(18): c(18) = a(18) Else GoTo 180

For j28 = 12 To 12                                            'a(28) = 12
If b(j28) = 0 Then b(j28) = j28: c(28) = j28 Else GoTo 280
a(28) = j28

a(22) = 50 - a(28)
If a(22) <= 0 Or a(22) > 49 Then GoTo 220
If b(a(22)) = 0 Then b(a(22)) = a(22): c(22) = a(22) Else GoTo 220

For j27 = m1 To m2                                            'a(27) = 32
If b(j27) = 0 Then b(j27) = j27: c(27) = j27 Else GoTo 270
a(27) = j27

a(23) = 50 - a(27)
If a(23) <= 0 Or a(23) > 49 Then GoTo 230
If b(a(23)) = 0 Then b(a(23)) = a(23): c(23) = a(23) Else GoTo 230
a(20) = 75 - a(27) - a(34) + a(37) - a(41)
If a(20) <= 0 Or a(20) > 49 Then GoTo 200
If b(a(20)) = 0 Then b(a(20)) = a(20): c(20) = a(20) Else GoTo 200
a(16) = -25 + a(27) + a(34) - a(37) + a(41)
If a(16) <= 0 Or a(16) > 49 Then GoTo 160
If b(a(16)) = 0 Then b(a(16)) = a(16): c(16) = a(16) Else GoTo 160

For j21 = 9 To 9                                              'a(21) = 9
If b(j21) = 0 Then b(j21) = j21: c(21) = j21 Else GoTo 210
a(21) = j21

a(15) = 50 - a(21)
If a(15) <= 0 Or a(15) > 49 Then GoTo 150
If b(a(15)) = 0 Then b(a(15)) = a(15): c(15) = a(15) Else GoTo 150
a(14) = -75 + a(15) + a(22) + a(29) + a(36) + a(43) - a(49)
If a(14) <= 0 Or a(14) > 49 Then GoTo 140
If b(a(14)) = 0 Then b(a(14)) = a(14): c(14) = a(14) Else GoTo 140
a(8) = 125 - a(15) - a(22) - a(29) - a(36) - a(43) + a(49)
If a(8) <= 0 Or a(8) > 49 Then GoTo 80
If b(a(8)) = 0 Then b(a(8)) = a(8): c(8) = a(8) Else GoTo 80

n9 = n9 + 1
GoSub 2650 'Print results (squares)
'                                   GoSub 2645 'Print results (selected numbers

b(c(8)) = 0: c(8) = 0
80  b(c(14)) = 0: c(14) = 0
140 b(c(15)) = 0: c(15) = 0
150 b(c(21)) = 0: c(21) = 0
210 Next j21

b(c(16)) = 0: c(16) = 0
160 b(c(20)) = 0: c(20) = 0
200 b(c(23)) = 0: c(23) = 0
230 b(c(27)) = 0: c(27) = 0
270 Next j27

b(c(22)) = 0: c(22) = 0
220 b(c(28)) = 0: c(28) = 0
280 Next j28

b(c(18)) = 0: c(18) = 0
180 b(c(19)) = 0: c(19) = 0
190 b(c(24)) = 0: c(24) = 0
240 b(c(26)) = 0: c(26) = 0
260 b(c(31)) = 0: c(31) = 0
310 b(c(32)) = 0: c(32) = 0
320 Next j32

b(c(17)) = 0: c(17) = 0
170 b(c(33)) = 0: c(33) = 0
330 Next j33

b(c(30)) = 0: c(30) = 0
300 b(c(34)) = 0: c(34) = 0
340 Next j34

b(c(29)) = 0: c(29) = 0
290 b(c(35)) = 0: c(35) = 0
350 Next j35

b(c(10)) = 0: c(10) = 0
100 b(c(13)) = 0: c(13) = 0
130 b(c(37)) = 0: c(37) = 0
370 b(c(38)) = 0: c(38) = 0
380 Next j38

b(c(11)) = 0: c(11) = 0
110 b(c(39)) = 0: c(39) = 0
390 Next j39

b(c(12)) = 0: c(12) = 0
120 b(c(40)) = 0: c(40) = 0
400 Next j40

b(c(9)) = 0: c(9) = 0
90  b(c(41)) = 0: c(41) = 0
410 Next j41

b(c(36)) = 0: c(36) = 0
360 b(c(42)) = 0: c(42) = 0
420 Next j42

b(c(2)) = 0: c(2) = 0
20  b(c(7)) = 0: c(7) = 0
70  b(c(43)) = 0: c(43) = 0
430 b(c(44)) = 0: c(44) = 0
440 Next j44

b(c(3)) = 0: c(3) = 0
30  b(c(45)) = 0: c(45) = 0
450 Next j45

b(c(4)) = 0: c(4) = 0
40  b(c(46)) = 0: c(46) = 0
460 Next j46

b(c(5)) = 0: c(5) = 0
50  b(c(47)) = 0: c(47) = 0
470 Next j47

b(c(6)) = 0: c(6) = 0
60  b(c(48)) = 0: c(48) = 0
480 Next j48

b(c(1)) = 0: c(1) = 0
10  b(c(49)) = 0: c(49) = 0
490 Next j49

t2 = Timer

t10 = Str(t2 - t1) + " sec., " + Str(n9) + " Solutions for sum" + Str(s1)
y = MsgBox(t10, 0, "Routine MgcSqr7d")

End

'   Print results (selected numbers)

2645 For i1 = 1 To 49
Cells(n9, i1).Value = a(i1)
Next i1

Return

'   Print results (squares)

2650 n2 = n2 + 1
If n2 = 5 Then
n2 = 1: k1 = k1 + 8: k2 = 0
Else
If n9 > 1 Then k2 = k2 + 8
End If
Cells(k1 + 1, k2 + 1).Select

i3 = 0
For i1 = 1 To 7
For i2 = 1 To 7
i3 = i3 + 1
Cells(k1 + i1, k2 + i2).Value = a(i3)
Next i2
Next i1

Return

End Sub