Step 1: Divide the number into separate digits:
41488 => 4 1 4 8 8
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
4 to 1 = 3
1 to 4 = 3
4 to 8 = 4
8 to 8 = 0
8 to 4 = 4
Step 3: Combine the filters to a string:
3 3 4 0 4 = 33404