# Tagged Questions

**5**

votes

**1**answer

399 views

### Rational approximation to a set of reals

Are there any well known algorithms for finding good rational approximations to sets of real numbers?
Given just two real numbers, I can use continued fractions to find a rational approximation to ...

**3**

votes

**1**answer

254 views

### Repetitions of the totient

In a program I'm writing I'm using that the function:
$rphi(1) = 0$
$rphi(n) = 1+rphi(phi(n))$
grows very slowly. Judging from https://oeis.org/A003434 it would seam like it is approximately ...