Residue Class Ring of Integers Modulo n with Unit Group of Order 2pqr
Yin Zhang · Journal of Ningbo University · 2014
Using the Chinese remainder theorem and the decomposition theorem for the structures of the residue class ring mod n and its unit group, the precise values of n and the group structures of U(Zn) are discussed and determined for some cases in which the order of U(Zn) is equal to 2pqr, where p, q and r are prime numbers(not necessarily distinct).