Step 1: Divide the number into separate digits:
88317 => 8 8 3 1 7
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
8 to 8 = 0
8 to 3 = 5
3 to 1 = 2
1 to 7 = 6
7 to 8 = 1
Step 3: Combine the filters to a string:
0 5 2 6 1 = 05261