Step 1: Divide the number into separate digits:
92051 => 9 2 0 5 1
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
9 to 2 = 7
2 to 0 = 2
0 to 5 = 5
5 to 1 = 4
1 to 9 = 8
Step 3: Combine the filters to a string:
7 2 5 4 8 = 72548