suggested number theory books

[newrandomusername]

Hello, I'm looking for some books to read in order to sharpen my math skills for solving these problems.
I think I sould look into number theory books such as "An Introduction To The Theory Of Numbers" by G.H. Hardy perhaps? Or should I focus on calculus books.
If anyone has some good recommendation I'll be happy to hear.

[DJohn]

This question might be better asked in Number Theory , which has this thread.

Hardy and Wright is the classic text. It doesn't matter that it's old, as the basics don't really change. It's pretty dense though - you have to read it slowly and carefully.

I'll add Tom Apostol "Introduction to Analytic Number Theory" to the list (it includes much non-analytic number theory as well). There's a lot of good material in there for solving Project-Euler-like problems.

If you enjoy calculus and want to improve your skills there, then by all means do so. I don't have any books to suggest though - I do not enjoy it.

Another area that's helpful for Project Euler problems is probability theory. There must be a huge number of introductions to that out there. I have Grimmett and Welsh "Probability: An Introduction", and found it helpful to get me started. There might be better. I have nothing to compare it to.

[newrandomusername]

thanks