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A088246 Decimal expansion of 21/(2*Pi^2).

%I A088246 #21 Feb 16 2025 08:32:51
%S A088246 1,0,6,3,8,7,2,4,2,8,2,4,4,5,4,6,6,0,0,1,6,0,7,3,4,3,6,3,7,0,2,1,4,0,
%T A088246 2,0,8,4,9,5,7,6,7,1,3,4,0,5,8,5,8,8,7,6,2,8,7,8,8,9,4,8,3,4,8,8,8,8,
%U A088246 1,7,7,7,0,1,0,3,4,7,2,1,3,2,5,0,7,6,9,7,3,7,6,2,1,9,0,2,9,2,9,4,9,4
%N A088246 Decimal expansion of 21/(2*Pi^2).
%H A088246 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/MoebiusFunction.html">Moebius Function</a>.
%H A088246 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%F A088246 Equals Sum_{k>=1} 1/A030229(k)^2. - _Amiram Eldar_, May 23 2020
%F A088246 Equals zeta(4)/zeta(6). - _Terry D. Grant_, Nov 07 2020
%F A088246 Equals Sum_{k>=1} A007434(k)/k^6. - _Amiram Eldar_, Jan 25 2024
%e A088246 1.06387242824454660016073436370214020849576713405858...
%t A088246 RealDigits[21/2/Pi^2, 10, 100][[1]] (* _Amiram Eldar_, May 23 2020 *)
%o A088246 (PARI) 21/2/Pi^2 \\ _Charles R Greathouse IV_, Oct 01 2022
%Y A088246 Cf. A007434, A030229, A082020, A088245.
%Y A088246 Cf. A104141.
%K A088246 nonn,cons
%O A088246 1,3
%A A088246 _Eric W. Weisstein_, Sep 25 2003