Step 1: Divide the number into separate digits:
05796 => 0 5 7 9 6
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
0 to 5 => 5
5 to 7 => 2
7 to 9 => 2
9 to 6 => 3
6 to 0 => 6
Step 3: Convert distances to codes (0=E[qual],
1 & 9 = C[onsecutive], 2-8 = N[one]):
5 => N
2 => N
2 => N
3 => N
6 => N
Step 4: Combine the filters to a string:
N N N N N = NNNNN