Step 1: Divide the number into separate digits:
84548 => 8 4 5 4 8
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
8 to 4 = 4
4 to 5 = 1
5 to 4 = 1
4 to 8 = 4
8 to 8 = 0
Step 3: Combine the filters to a string:
4 1 1 4 0 = 41140