Step 1: Divide the number into separate digits:
43006 => 4 3 0 0 6
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
4 to 3 = 1
3 to 0 = 3
0 to 0 = 0
0 to 6 = 6
6 to 4 = 2
Step 3: Combine the filters to a string:
1 3 0 6 2 = 13062