Another quick way to know which Column is spun is the following easy rules to remember:
1) If the number is divisible by 3 evenly, (3,6,9 etc.) it is always in the 3rd Column
2) If the number +1 is divisible by 3 evenly (2,5,8,11 etc.) it is always in the 2nd Column
3) If the number 1 is divisible by 3 evenly (4,7,10,13 etc.) it is always in the 1st Column
Obviously the number 1 spun, is in the first Column, no math needed!
15

33 
15 
5 
31 
34 
19 
34 
20 
13 
08 
11 
07 
30 
34 
16 
08 
13 
25 
31

[snip]
I like #7 categorization! #6 is not bad as a backup.