Highschool level number theory book recommendations [duplicate]

What's a good number theory book for me to learn from at a high school level? Our class will study up to Fermat's - Bezout's theorem. I tried other books suggested here, but they are all too advanced. Thank you in advance.

I'd recommend the books by Wacław Sierpiński: Elementary theory of numbers and as a supplementary problem book 250 Problems in Elementary Number Theory.

Prove that if $A$ is regular then $\operatorname{adj}(\operatorname{adj}(A)) = (\det A)^{n-2} A$

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$a\in \mathbb{N}$, $p$ prime, $a<p$ prove that $a\mid p+1\iff\exists\, b,c\in\Bbb N:\dfrac{a}{p}=\dfrac{1}{b}+\dfrac{1}{c}$ [duplicate]

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