By Titu Andreescu

ISBN-10: 0817645276

ISBN-13: 9780817645274

ISBN-10: 0817645616

ISBN-13: 9780817645618

This not easy challenge publication by means of well known US Olympiad coaches, arithmetic academics, and researchers develops a large number of problem-solving abilities had to excel in mathematical contests and in mathematical learn in quantity concept. delivering notion and highbrow pride, the issues through the ebook inspire scholars to specific their rules in writing to give an explanation for how they conceive difficulties, what conjectures they make, and what conclusions they succeed in. using particular recommendations and methods, readers will gather a superb knowing of the basic techniques and concepts of quantity theory.

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**Extra info for 104 number theory problems : from the training of the USA IMO team**

**Example text**

Let a, b, n be integers, n = 0, such that a = nq1 + r1 , b = nq2 + r2 , 0 ≤ r1 , r2 < |n|. Then a ≡ b (mod n) if and only if r1 = r2 . Proof: Because a − b = n(q1 − q2 ) + (r1 − r2 ), it follows that n | (a − b) if and only if n | (r1 −r2 ). Taking into account that |r1 −r2 | < |n|, we have n | (r1 −r2 ) if and only if r1 = r2 . 20. Prove that there are inﬁnitely many primes of the form 4k − 1; that is, congruent to 3 modulo 4. Proof: We ﬁrst note that there is at least one prime p with p ≡ 3 (mod 4) (simply set p = 3).

Hence 11111(n) is not a perfect square for any positive integers other than 3. For n = 3, we have 11111(3) = 121 = 112 . In the last example, we showed that an integer is not a perfect square by placing the integer between two consecutive perfect squares. This method works because integers are discrete. Such methods will hardly work for real numbers, since there are no holes in between real numbers. This is a very useful method in solving Diophantine equations. In certain numerical systems, the base does not have to be constant.

An , b are ﬁxed integers, is called a linear Diophantine equation. We assume that n ≥ 1 and that coefﬁcients a1 , . . , an are all different from zero. 7. (B´ezout’s identity). 39. The equation (∗) is solvable if and only if gcd(a1 , . . , an ) | b. In case of solvability, all integer solutions to (∗) can be expressed in terms of n −1 integral parameters. Proof: Let d = gcd(a1 , . . , an ). If b is not divisible by d, then (∗) is not solvable, since for any integers x1 , . . , xn the left-hand side of (∗) is divisible by d and the right-hand side is not.

### 104 number theory problems : from the training of the USA IMO team by Titu Andreescu

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