Step 1: Divide the number into separate digits:
52230 => 5 2 2 3 0
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
5 to 2 = 3
2 to 2 = 0
2 to 3 = 1
3 to 0 = 3
0 to 5 = 5
Step 3: Combine the filters to a string:
3 0 1 3 5 = 30135