Download Analytic Number Theory: Exploring the Anatomy of Integers by Jean-marie De Koninck, Florian Luca PDF

By Jean-marie De Koninck, Florian Luca

ISBN-10: 0821875779

ISBN-13: 9780821875773

The authors gather a desirable choice of issues from analytic quantity idea that offers an creation to the topic with a truly transparent and designated specialize in the anatomy of integers, that's, at the research of the multiplicative constitution of the integers. the most very important issues provided are the worldwide and native habit of mathematics features, an in depth examine of tender numbers, the Hardy-Ramanujan and Landau theorems, characters and the Dirichlet theorem, the $abc$ conjecture in addition to a few of its functions, and sieve equipment. The ebook concludes with a complete bankruptcy at the index of composition of an integer. one in all this book's most sensible positive aspects is the gathering of difficulties on the finish of every bankruptcy which were selected conscientiously to enhance the cloth. The authors comprise strategies to the even-numbered difficulties, making this quantity very acceptable for readers who are looking to try out their realizing of the idea awarded within the booklet.

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Example text

Suppose that n ≥ 2. Prove that n k=2 n2 = k n2 k=n+1 n2 k H 14. Let a, b, n be positive integers with gcd(a, b) = 1. Prove that k ak + b n = n−1 , 2 where k runs through a complete system of residues modulo m. H 15. Find the total number of different integer values the function f (x) = [x] + [2x] + 5x + [3x] + [4x] 3 takes for real numbers x with 0 ≤ x ≤ 100. H 16. Prove or disprove that there exists a positive real number u such that [un ] − n is an even integer for all positive integer n. H 17.

Show that φ(2n − 1) is divisible by n. H 22. (Gauss) Show that for all n ∈ N, n= φ(d). d|n H 23. If p is a prime and n an integer such that 1 < n ≤ p, then p−1 nk φ ≡ 0 (mod p). k=0 H 24. Let m, n be positive integers. Prove that, for some positive integer a, each of φ(a), φ(a + 1), · · · , φ(a + n) is a multiple of m. √ H 25. If n is composite, prove that φ(n) ≤ n − n. H 26. Show that if m and n are relatively prime positive integers, then φ(5m − 1) = 5n − 1. H 27. Show that if the equation φ(x) = n has one solution it always has a second solution, n being given and x being the unknown.

Show that for any set of p − 1 consecutive integers, the set cannot be divided two subsets so that the product of the members of the one set is equal to the product of the members of the other set. K 47. Let S be the set of all composite positive odd integers less than 79. (a) Show that S may be written as the union of three (not necessarily disjoint) arithmetic progressions. (b) Show that S cannot be written as the union of two arithmetic progressions. K 48. Let a1 , · · · , a44 be natural numbers such that 0 < a1 < a2 < · · · < a44 < 125.

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