The 1st digit is divided into 7 parts

Divide the 1st digit of the lottery numbers (1-31) into 7 parts:

No.1 range: 1 - 5

No.2 range: 6 - 10

No.3 range: 11 - 15

No.4 range: 16 - 19

No.5 range: 20 - 23

No.6 range: 24 - 27

No.7 range: 28 - 31