Hopefully this helps with understanding of Euler phi function.
The Online Encyclopedia of Integer Sequences lists values of phi(n).
http://oeis.org/A000010
Also, I like Wolfram as a reference
http://mathworld.wolfram.com/TotientFunction.html
For example phi(6) = 2 because 1 and 5 are relatively prime to 6.
For what its worth.
Matt