In number theory, Euler's totient function φ(n)φ(n) counts the positive integers up to a given integer nn that are relatively prime to nn. It can be defined more formally as the number of integers kk in the range 1≤k≤n1≤k≤n for which the greatest common divisor gcd(n,k)gcd(n,k) is equal to 11. In number theory, Euler's totient functio
阅读背景：
D - Problem D. Euler Function （欧拉函数找规律）
来源：互联网
分享到：
