Since the start of using any kind of SMS 2FA I keep noticing, that for some systems you get “nice to remember” numbers somewhat often. I didn't care enough to a

Since the start of using any kind of SMS 2FA I keep noticing, that for some systems you get “nice to remember” numbers somewhat often. I didn't care enough to actually write them down and confirm whether it is a fact or just my internal bias of finding patterns where there are not any. On the other hand, various decimal “random” numbers around payment cards (default PIN, authorization codes and what not) are clearly biased, because they are usually generated by taking hexadecimal representation modulo 10.