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The greatest common divisor (GCD) of integers a and b, at least one of which is nonzero, is the greatest positive integer d such that d is a divisor of both a and b; that is, there are integers e and f such that a = de and b = df, and d is the largest such integer.
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For example, 6 and 35 factor as 6 = 2 × 3 and 35 = 5 × 7, so they are not prime, but their prime factors are different, so 6 and 35 are coprime, with no common factors other than 1. A 24×60 rectangle is covered with ten 12×12 square tiles, where 12 is the GCD of 24 and 60.
ISBN 978-0-224-08635-6. pp. 140–153. External links. Long multiplication − The Box method, Maths online. Long multiplication and division ...
x 2 − 5x − 6 = (12 x + 12) ( 1 / 12 x − 1 / 2 ) + 0 Since 12 x + 12 is the last nonzero remainder, it is a GCD of the original polynomials, and the monic GCD is x + 1 . In this example, it is not difficult to avoid introducing denominators by factoring out 12 before the second step.
Fermat's little theorem states that if p is prime and a is coprime to p, then a p−1 − 1 is divisible by p.For a positive integer a, if a composite integer x divides a x−1 − 1, then x is called a Fermat pseudoprime to base a.
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