Step 1: Divide the number into separate digits:
61059 => 6 1 0 5 9
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
6 to 1 = 5
1 to 0 = 1
0 to 5 = 5
5 to 9 = 4
9 to 6 = 3
Step 3: Combine the filters to a string:
5 1 5 4 3 = 51543