Step 1: Divide the number into separate digits:
30830 => 3 0 8 3 0
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 3 = 5
3 to 0 = 3
0 to 3 = 3
Step 3: Combine the filters to a string:
3 8 5 3 3 = 38533