Two numbers are "relatively prime" when they have no common factors other than 1.

In other words you cannot evenly divide both by some common value.

Examples:  • 7 and 20 are relatively prime (no common factor) • 6 and 20 are not relatively prime because you can evenly divide both by 2 (2 is a common factor)


source: [accessed on 18/03/2015]

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