I understand general logic in this solution, tho my approach was a bit different.

My question is about the first block of code: building list of primes

I also used sieve to get some primes in my solution, but in different context.

Here they are building sieve of primes in range 50000, and my question: **why 50000**?

If there is some maths behind using this value, there are no comments about it in the code. and I am very curious about such choice of size for list of primes

If it’s just hardcoded - I am not sure that I am big fan of that.