Step 1: Divide the number into separate digits:
31833 => 3 1 8 3 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
3 to 1 = 2
1 to 8 = 7
8 to 3 = 5
3 to 3 = 0
3 to 3 = 0
Step 3: Combine the filters to a string:
2 7 5 0 0 = 27500