质数p,q.满足3p+5q=31,求p除以3q+1

题目

质数p,q.满足3p+5q=31,求p除以3q+1

答案

p=2,q=5 p/3q+1=2/10+1=6/5 p=7,q=2 p/3q+1=7/6+1=13/6