EulerPhi(3+6I)=20 why ?can some one give me detailed explanation , I would be greatful
... first we search the n for which is . Searching the primes so that we find , , and , so that n must contain one or more of these primes and necessarly . Taking into account that we find that the possible values of n are , , and . Among these n, the only for which is is so that is ...