What are the best sources(textbook/websites) for learning number theory concepts?

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number theory part 1:https://www.hackerearth.com/practice/notes/number-theory-1/

number theory part 2:https://www.hackerearth.com/practice/notes/number-theory-ii/

number theory part3:https://www.hackerearth.com/practice/notes/number-theory-iii/

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Thanks a lotâ€¦