Step 1: Divide the number into separate digits:
03153 => 0 3 1 5 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
0 to 3 = 3
3 to 1 = 2
1 to 5 = 4
5 to 3 = 2
3 to 0 = 3
Step 3: Combine the filters to a string:
3 2 4 2 3 = 32423