Integer number spectrum

1st column

2nd column

3rd column

4th column

5th column

6th column

1st row

1

2

3

4

5

6

2nd row

7

8

9

10

11

12

3rd row

13

14

15

16

17

18

4th row

19

20

21

22

23

24

5th row

25

26

27

28

29

30

6th row

31

32

33

34

35

36

n-th row

6(n − 1) + 1

6(n − 1) + 2

6(n − 1) + 3

6(n − 1) + 4

6(n − 1) + 5

6(n − 1) + 6