Step 1: Divide the number into separate digits:
11829 => 1 1 8 2 9
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
1 to 1 = 0
1 to 8 = 7
8 to 2 = 6
2 to 9 = 7
9 to 1 = 8
Step 3: Combine the filters to a string:
0 7 6 7 8 = 07678