### tgbaodeeptry's blog

By tgbaodeeptry, history, 6 weeks ago,

Hello guys,

Today, I am facing a serious problem, I get idea, but I don't is it possible to do it.

Assume that, I have a number n and I want to calculate count numbers that is co-prime to n and it is also in range [L, R]

I read totient Euler but I think it won't help me ...

Thanks so much for trying to understand my poor English. :(

• +6

 » 6 weeks ago, # |   +4 After reading this you should be able to solve the problem for N,L,R<=1e18
•  » » 6 weeks ago, # ^ |   +1 Thanks sir, let me read it :D