5
votes
1answer
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
1answer
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 ...