Step 1: Divide the number into separate digits:
42641 => 4 2 6 4 1
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
4 to 2 = 2
2 to 6 = 4
6 to 4 = 2
4 to 1 = 3
1 to 4 = 3
Step 3: Combine the filters to a string:
2 4 2 3 3 = 24233