Divide 1 to 41 into 20 scales

Divide the numbers from 1-41 into 20 scales, with each scale representing the following numerical intervals:

Size 1st: 1 - 3

Size 2nd: 4 - 5

Size 3rd: 6 - 7

Size 4th: 8 - 9

Size 5th: 10 - 11

Size 6th: 12 - 13

Size 7th: 14 - 15

Size 8th: 16 - 17

Size 9th: 18 - 19

Size 10th: 20 - 21

Size 11th: 22 - 23

Size 12th: 24 - 25

Size 13th: 26 - 27

Size 14th: 28 - 29

Size 15th: 30 - 31

Size 16th: 32 - 33

Size 17th: 34 - 35

Size 18th: 36 - 37

Size 19th: 38 - 39

Size 20th: 40 - 41