This is very interesting, thanks for posting it!

I understand that the digits of the four-digit number chosen should not be all equal (AAAA) for this process to work but are there other four-digit number exceptions that won't yield 6174 through this process? For example, what about number 1000?

Thanks again,

Aziz Inan

This question is for testing whether you are a human visitor and to prevent automated spam submissions.