Step 1: Divide the number into separate digits:
30084 => 3 0 0 8 4
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
3 to 0 = 3
0 to 0 = 0
0 to 8 = 8
8 to 4 = 4
4 to 3 = 1
Step 3: Combine the filters to a string:
3 0 8 4 1 = 30841