Step 1: Divide the number into separate digits:
05745 => 0 5 7 4 5
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
0 to 5 = 5
5 to 7 = 2
7 to 4 = 3
4 to 5 = 1
5 to 0 = 5
Step 3: Combine the filters to a string:
5 2 3 1 5 = 52315