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What is a very helpful book for elementary number theory? I would like to teach myself and I need help finding a book that would be able to do this.

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George Andrew's number theory is fun and good.

Ivan Niven's book is complete and covers continuous fractions really well

Ireland and Rosen's modern number theory is a master piece, but requires some notions of modern algebra

Asinomás
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There are several elementary number theory books available from Dover. Since they are really inexpensive you can get several and see the same material expressed in several ways, which may help you in self study.

http://store.doverpublications.com/by-subject-mathematics-theory.html

Friedbergs's "An Adventurers Guide to Number Theory" is off-beat but perhaps interesting. Also Dover, her's the Amazon link: https://www.amazon.com/Adventurers-Guide-Number-Theory-Mathematics/dp/0486281337

Ethan Bolker
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