Step 1: Divide the number into separate digits:
48785 => 4 8 7 8 5
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
4 to 8 = 4
8 to 7 = 1
7 to 8 = 1
8 to 5 = 3
5 to 4 = 1
Step 3: Combine the filters to a string:
4 1 1 3 1 = 41131