Step 1: Divide the number into separate digits:
71083 => 7 1 0 8 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
7 to 1 = 6
1 to 0 = 1
0 to 8 = 8
8 to 3 = 5
3 to 7 = 4
Step 3: Combine the filters to a string:
6 1 8 5 4 = 61854