Step 1: Divide the number into separate digits:
77696 => 7 7 6 9 6
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
7 to 7 = 0
7 to 6 = 1
6 to 9 = 3
9 to 6 = 3
6 to 7 = 1
Step 3: Combine the filters to a string:
0 1 3 3 1 = 01331