Step 1: Divide the number into separate digits:
7116 => 7 1 1 6
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
7 to 1 = 6
1 to 1 = 0
1 to 6 = 5
6 to 7 = 1
Step 3: Combine the filters to a string:
6 0 5 1 = 6051