Step 1: Divide the number into separate digits:
81433 => 8 1 4 3 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
8 to 1 = 7
1 to 4 = 3
4 to 3 = 1
3 to 3 = 0
3 to 8 = 5
Step 3: Combine the filters to a string:
7 3 1 0 5 = 73105