A Fast Algorithm for Determining the Existence and Value of Integer Roots of N

Autor:	Libby, Vibeke
Rok vydání:	2010
Předmět:	Mathematics - Number Theory Computer Science - Discrete Mathematics Computer Science - Data Structures and Algorithms 11A07 11D09 11Y05 B.2.4 D.1.0 F.2.1 G.2.0
Druh dokumentu:	Working Paper
Popis:	We show that all perfect odd integer squares not divisible by 3, can be usefully written as sqrt(N) = a + 18p, where the constant a is determined by the basic properties of N. The equation can be solved deterministically by an efficient four step algorithm that is solely based on integer arithmetic. There is no required multiplication or division by multiple digit integers, nor does the algorithm need a seed value. It finds the integer p when N is a perfect square, and certifies N as a non-square when the algorithm terminates without a solution. The number of iterations scales approximately as log(sqrt(N)/2) for square roots. The paper also outlines how one of the methods discussed for squares can be extended to finding an arbitrary root of N. Finally, we present a rule that distinguishes products of twin primes from squares. Comment: 12 pages, 8 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1003.5390 Zobrazit plný text záznamu View this record from Arxiv