Step 1: Divide the number into separate digits:
26417 => 2 6 4 1 7
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
2 to 6 = 4
6 to 4 = 2
4 to 1 = 3
1 to 7 = 6
7 to 2 = 5
Step 3: Combine the filters to a string:
4 2 3 6 5 = 42365