\magnification=1200
\hsize=4in
\overfullrule=0pt
\input amssym
%\def\frac#1 #2 {{#1\over #2}}
\def\emph#1{{\it #1}}
\def\em{\it}
\nopagenumbers
\noindent
%
%
{\bf H.N. Ramaswamy and C.R. Veena}
%
%
\medskip
\noindent
%
%
{\bf On the Energy of Unitary Cayley Graphs}
%
%
\vskip 5mm
\noindent
%
%
%
%
In this note we obtain the energy of unitary Cayley graph $X_{n}$
which extends a result of R. Balakrishnan for power of a prime and
also determine when they are hyperenergetic. We also prove that
${E(X_{n})\over 2(n-1)}\geq{2^{k}\over 4k}$, where $k$ is the number
of distinct prime divisors of $n$. Thus the ratio 
${E(X_{n})\over 2(n-1)}$, measuring the degree of hyperenergeticity of
$X_{n}$, grows exponentially with $k$.



\bye