Step 1: Divide the number into separate digits:
93812 => 9 3 8 1 2
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
9 to 3 = 6
3 to 8 = 5
8 to 1 = 7
1 to 2 = 1
2 to 9 = 7
Step 3: Combine the filters to a string:
6 5 7 1 7 = 65717