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 2006-01-24, 18:18 #5 alpertron     Aug 2002 Buenos Aires, Argentina 17×79 Posts The quotient $\zeta {(n)}/\pi^n$ for n even is always rational, but for odd values of n, such as in this case there is no known explicit finite expression using elementary functions and constants. Last fiddled with by alpertron on 2006-01-24 at 18:19