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Two or more integers are coprime if they have no positive factors in common other than 1.

There are lots of ways used to say or write this:

  • a is coprime to b.
  • a is relatively prime to b.
  • a is mutually prime to b.
  • hcf(a,b)=1.
  • gcd(a,b)=1.
  • ab.

For example, 14 and 15 are coprime to each other as 14=2×7 and 15=3×5: they have no positive common factors other than 1.