HP 35s - How to write a for loop

[bxzj]

Hi!

I need to create a program to compute Euler's totient function but
i'm stuck in a for loop.
I have to write something like that:

Code:


for(i = 1; i < n; i++)
  // do stuff

I'm aware of the ISG operator and the loop-control number (i.e.

Code:

ccccccc.fffii

)
but i don't known how to integrate it with the i < n part. Is it possible? If so, can someone give
me an example of a for loop?

Thanks