Step 1: Divide the number into separate digits:
04743 => 0 4 7 4 3
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
0 to 4 = 4
4 to 7 = 3
7 to 4 = 3
4 to 3 = 1
3 to 0 = 3
Step 3: Combine the filters to a string:
4 3 3 1 3 = 43313