Kaprekar's constant is $6174$ . Take any four digit number with at least two different digits; create two four digit numbers by writing the digits in descending order and in ascending order; subtract the two numbers, and repeat. Eventually, you will end up at 6174, where the process stays.
I have been trying to find a similar constant for 5 digits but am only getting these 3 series .
$$1) 74943 -> 62964 -> 71973 -> 83952 -> repeats $$
$$ 2) 63954 -> 61974 -> 82962 -> 75933 -> repeats$$
$$ 3) 53955 -> 59994 -> repeats$$
Similarly a series for 6 digits $$ 851742 -> 750843 -> 840852 -> 860832 -> 862632 -> 642654 -> 420876 -> repeat$$ I would like to know is there any way to generate these kinds of numbers or series for n digit number?