coprime vs relatively prime

coprime

adj
  • Having no positive integer factors in common, aside from 1. 

  • Having no positive integer factors, aside from 1, in common with one or more specified other positive integers. 

  • Whose greatest common divisor is a nonzero constant (i.e., polynomial of degree 0). 

relatively prime

adj
  • having no factors (except the number 1) in common. 

  • having no factors (except the number 1) in common with a specified other number or numbers. 

How often have the words coprime and relatively prime occurred in a corpus of books? (source: Google Ngram Viewer )