Show:
x3
x4
x5
x6
x7
100

3x1

3

100

4x1

4

100

5x1

5

100

6x1

6

100

7x1

7

200

3x3

9

200

4x4

16

200

5x5

25

200

6x6

36

200

7x7

49

300

3x6

18

300

4x8

32

300

5x8

40

300

6x4

24

300

7x3

21

400

3x11

33

400

4x11

44

400

5x11

55

400

6x11

66

400

7x11

77

500

3x12

36

500

4x12

48

500

5x12

60

500

6x12

72

500

7x12

84