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Two integers are relatively prime if they share no common positive factors (divisors) except 1. Using the notation to denote the greatest common divisor, two integers and are relatively prime if . Relatively prime integers are sometimes also called strangers or coprime and are denoted . The plot above plots and along the two axes and colors a square black if and white otherwise (left figure) and simply colored according to (right figure).

Two numbers can be tested to see if they are relatively prime in the Wolfram Language using CoprimeQ[m, Blue Jersey Navy Rangers Navy Blue n].

Two distinct primes and are always relatively prime, , as are any positive integer powers of distinct primes and , .

Relative primality is not transitive. For example, and , but .

The probability that two Cheap Wholesale Jerseys Authentic Mlb and picked at random are relatively prime is


(OEIS A059956; Cesàro and Sylvester 1883; Lehmer 1900; Sylvester 1909; Nymann 1972; Wells 1986, p. 28; Borwein and Bailey 2003, p. 139; Havil 2003, pp. 40 and 65; Moree 2005), where is the Riemann zeta function. This result is related to the fact that the greatest common divisor of and , , can be interpreted as the number of lattice points in the plane which lie on the straight line connecting the vectors and (excluding itself). In fact, is the fractional number of lattice points visible from the origin (Castellanos 1988, pp. 155-156).

Given three Cheap Wholesale Jerseys Authentic Mlb chosen at random, the probability that no common factor will divide them all is


(OEIS A088453; Wells 1986, p. 29), where is Phoenix Coyotes Camo Camo Jersey Coyotes Phoenix Phoenix Jersey Phoenix Jersey Coyotes Camo Coyotes (Wells 1986, p. 29). In general, the probability that random numbers lack a th power common divisor is (Cohen 1959, Salamin 1972, Nymann 1975, Schoenfeld 1976, Porubský 1981, Chidambaraswamy and Sitaramachandra Rao 1987, Hafner et al. 1993).

Interestingly, the probability that two Gaussian integers and are relatively prime is


(OEIS A088454), where is Catalan's constant (Pegg; Collins and Johnson 1989; Finch 2003, p. 601).

Similarly, the probability that two random Eisenstein integers are relatively prime is


(OEIS A088467Eddie Eddie Jersey Jersey Eddie Jersey Eddie George George Jersey George George), where


(Finch 2003, p. 601), which can be written analytically as

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(OEIS A086724), where is the trigamma function

Amazingly, the probabilities for random pairs of integers and Gaussian integers being relatively prime are the same as the asymptotic densities of squarefree integers of these types.

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