Step 1: Divide the number into separate digits:
72375 => 7 2 3 7 5
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
7 to 2 = 5
2 to 3 = 1
3 to 7 = 4
7 to 5 = 2
5 to 7 = 2
Step 3: Combine the filters to a string:
5 1 4 2 2 = 51422