Unique number of two not equal numbers

Question

I want to get a unique number out of two not equal numbers

Answer 1

Here is a method that would work for any integer less than 1 billion:
1. check that they are not equal
2. convert to strings
3. get the length of the first number
4. NewString=First+Second+len(first)
5. int(NewString)
ex:
input: 123, 45
output: 123453

The only downside is that the first number must be less than a billion, but the method should work for you.
edit: you can add another term on the end to tell you the length of the length of the first one, which will get you to 10^(10^10) before it fails.

Answer 2

Thank you for your answer but i have already a better code with

https://en.m.wikipedia.org/wiki/Pairing_function

Here:
https://code.sololearn.com/w2x1afS83N2n/?ref=app