Step 1: Divide the number into separate digits:
30886 => 3 0 8 8 6
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
3 to 0 = 3
0 to 8 = 8
8 to 8 = 0
8 to 6 = 2
6 to 3 = 3
Step 3: Combine the filters to a string:
3 8 0 2 3 = 38023