%I #8 Jan 03 2024 07:07:44
%S 2,2,691,7234,174611,163327586881,13571120588,55769228412163778,
%T 1154372017217796891921391,45587914559383477650447161,
%U 786244320265033260236106076,1325861528365506758393998232189714777
%N a(n) = Pi^(2n)*denominator of Sum_{k in A030059} 1/k^(2n).
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/PrimeSums.html">Prime Sums</a>
%F (Denominator of (zeta(2n)^2-zeta(4n))/(2zeta(2n)zeta(4n)))/Pi^(2n). See Eqns (28) to (31) of the link.
%e 9/(2*Pi^2), 15/(2*Pi^4), 11340/(691*Pi^6), 278775/(7234*Pi^8), ...
%Y Cf. A030059, A093595.
%K nonn,frac
%O 1,1
%A _Eric W. Weisstein_, Apr 03 2004
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