Step 1: Divide the number into separate digits:
03256 => 0 3 2 5 6
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
0 to 3 = 3
3 to 2 = 1
2 to 5 = 3
5 to 6 = 1
6 to 0 = 6
Step 3: Combine the filters to a string:
3 1 3 1 6 = 31316