What could be the possible algorithm for generating these lines of numbers?

[ech0]

First of all, i found this forum after long time spent on searching on the internet about solution of my problem, i am new here, this is my first post, and i would be more than happy if someone has in mind some solution of my problem

Let me get to the point

My brother is using an algorithm to generate 2 lines of numbers
Something like this
1.7575646000
2.9502504684

i will call the first line of numbers "username"
the second one "password"

here are all the "usernames" and "passwords" i have got by now

username :7654546259
password :7475354934

username :7575646000
password :9502504684

username :7592003966
password :6261731192

username :7621294731
password :1280316572

username :7627240089
password :7309367083 

username :7628953394
password :9543425250

username :7633187733
password :4678861168

username :7636741415
password :8955813129

username :7642148904
password :7642148904

username :7644462216
password :1616582084 
number   :

username :7654546259
password :7475354934

My point is to find the algorithm so i can generate the 2 lines of numbers myself

NOTICE : This numbers are not in any kind associated with some sort of sales, this is strictly for private usage

If the algorithm can be found by using these "usernames" and "passwords" , please post and let me know

Also, i apologyze if i posted this in the wrong section

Thanks in advance

 

[AUMathTutor]

I doubt you're going to be able to reconstruct the algorithm from such a small number of outputs.

Knowing nothing else about it, if it takes no arguments as input, I'm betting that it does one of the following things to get the numbers:
(a) some variation on regular pseudorandom numbers
(b) some variation on the system time / system clock
(c) some non-deterministic measurement, like a temperature sensor
(d) using unitialized variables

I wouldn't be surprised if there is some sort of mapping from usernames to passwords, such that the username dictates the password.

I mean, think about it. If you have 20 digits that don't seem to follow any pattern, how many different rules could be used to generate numbers? A lot.

Do you see any commonalities between various usernames or passwords?